mirror of
https://github.com/golang/go
synced 2024-11-24 23:07:56 -07:00
doc: update codelab/wiki to Go 1.
R=golang-dev, r, adg CC=golang-dev https://golang.org/cl/5683076
This commit is contained in:
Shenghou Ma
parent
27e07a2666
commit
52cd4c8610
@ -2,13 +2,9 @@
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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include ../../../src/Make.inc
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all: index.html
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include ../../../src/Make.common
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CLEANFILES+=srcextract.bin htmlify.bin get.bin
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CLEANFILES:=srcextract.bin htmlify.bin get.bin
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index.html: wiki.html srcextract.bin htmlify.bin
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PATH=.:$$PATH awk '/^!/{system(substr($$0,2)); next} {print}' < wiki.html | tr -d '\r' > index.html
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@ -17,9 +13,8 @@ test: get.bin
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bash ./test.sh
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rm -f get.6 get.bin
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%.bin: %.$O
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$(LD) -o $@ $<
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%.$O: %.go
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$(GC) $(GCFLAGS) $(GCIMPORTS) $*.go
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%.bin: %.go
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go build -o $@ $^
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clean:
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rm -f $(CLEANFILES)
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@ -6,10 +6,10 @@ package main
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import (
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"errors"
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"html/template"
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"io/ioutil"
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"net/http"
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"regexp"
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"text/template"
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)
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type Page struct {
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@ -5,9 +5,9 @@
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package main
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import (
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"html/template"
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"io/ioutil"
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"net/http"
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"text/template"
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)
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type Page struct {
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@ -5,10 +5,10 @@
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package main
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import (
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"html/template"
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"io/ioutil"
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"net/http"
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"regexp"
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"text/template"
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)
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type Page struct {
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@ -59,7 +59,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
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}
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func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
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t, err := template.ParseFiles(tmpl+".html", nil)
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t, err := template.ParseFiles(tmpl + ".html")
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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@ -5,9 +5,9 @@
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package main
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import (
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"html/template"
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"io/ioutil"
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"net/http"
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"text/template"
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)
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type Page struct {
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@ -55,7 +55,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request) {
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}
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func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
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t, _ := template.ParseFiles(tmpl+".html", nil)
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t, _ := template.ParseFiles(tmpl + ".html")
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t.Execute(w, p)
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}
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@ -5,10 +5,10 @@
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package main
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import (
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"html/template"
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"io/ioutil"
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"net/http"
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"regexp"
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"text/template"
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)
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type Page struct {
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@ -6,8 +6,8 @@ Covered in this codelab:
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</p>
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<ul>
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<li>Creating a data structure with load and save methods</li>
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<li>Using the <code>http</code> package to build web applications
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<li>Using the <code>template</code> package to process HTML templates</li>
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<li>Using the <code>net/http</code> package to build web applications
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<li>Using the <code>html/template</code> package to process HTML templates</li>
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<li>Using the <code>regexp</code> package to validate user input</li>
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<li>Using closures</li>
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</ul>
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@ -18,21 +18,18 @@ Assumed knowledge:
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<ul>
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<li>Programming experience</li>
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<li>Understanding of basic web technologies (HTTP, HTML)</li>
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<li>Some UNIX command-line knowledge</li>
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<li>Some UNIX/DOS command-line knowledge</li>
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</ul>
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<h2>Getting Started</h2>
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<p>
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At present, you need to have a Linux, OS X, or FreeBSD machine to run Go. If
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you don't have access to one, you could set up a Linux Virtual Machine (using
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<a href="http://www.virtualbox.org/">VirtualBox</a> or similar) or a
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<a href="http://www.google.com/search?q=virtual+private+server">Virtual
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Private Server</a>.
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At present, you need to have a FreeBSD, Linux, OS X, or Windows machine to run Go.
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We will use <code>$</code> to represent the command prompt.
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</p>
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<p>
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Install Go (see the <a href="http://golang.org/doc/install.html">Installation Instructions</a>).
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Install Go (see the <a href="/doc/install.html">Installation Instructions</a>).
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</p>
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<p>
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@ -40,8 +37,8 @@ Make a new directory for this codelab and cd to it:
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</p>
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<pre>
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$ mkdir ~/gowiki
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$ cd ~/gowiki
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$ mkdir gowiki
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$ cd gowiki
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</pre>
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<p>
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@ -55,15 +52,13 @@ package main
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import (
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"fmt"
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"io/ioutil"
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"os"
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)
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</pre>
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<p>
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We import the <code>fmt</code>, <code>ioutil</code> and <code>os</code>
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packages from the Go standard library. Later, as we implement additional
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functionality, we will add more packages to this <code>import</code>
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declaration.
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We import the <code>fmt</code> and <code>ioutil</code> packages from the Go
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standard library. Later, as we implement additional functionality, we will
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add more packages to this <code>import</code> declaration.
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</p>
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<h2>Data Structures</h2>
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@ -84,8 +79,8 @@ type Page struct {
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<p>
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The type <code>[]byte</code> means "a <code>byte</code> slice".
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(See <a href="http://golang.org/doc/effective_go.html#slices">Effective Go</a>
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for more on slices.)
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(See <a href="/doc/articles/slices_usage_and_internals.html">Slices: usage and
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internals</a> for more on slices.)
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The <code>Body</code> element is a <code>[]byte</code> rather than
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<code>string</code> because that is the type expected by the <code>io</code>
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libraries we will use, as you'll see below.
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@ -178,9 +173,8 @@ func loadPage(title string) (*Page, error) {
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<p>
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Callers of this function can now check the second parameter; if it is
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<code>nil</code> then it has successfully loaded a Page. If not, it will be an
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<code>error</code> that can be handled by the caller (see the <a
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href="http://golang.org/pkg/os/#Error">os package documentation</a> for
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details).
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<code>error</code> that can be handled by the caller (see the
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<a href="/doc/go_spec.html#Errors">language specification</a> for details).
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</p>
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<p>
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@ -210,23 +204,21 @@ You can compile and run the program like this:
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</p>
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<pre>
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$ 8g wiki.go
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$ 8l wiki.8
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$ ./8.out
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$ go build wiki.go
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$ ./wiki
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This is a sample page.
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</pre>
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<p>
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(The <code>8g</code> and <code>8l</code> commands are applicable to
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<code>GOARCH=386</code>. If you're on an <code>amd64</code> system,
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substitute 6's for the 8's.)
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(If you're using Windows you must type "<code>wiki</code>" without the
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"<code>./</code>" to run the program.)
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</p>
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<p>
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<a href="part1.go">Click here to view the code we've written so far.</a>
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</p>
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<h2>Introducing the <code>http</code> package (an interlude)</h2>
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<h2>Introducing the <code>net/http</code> package (an interlude)</h2>
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<p>
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Here's a full working example of a simple web server:
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@ -292,18 +284,17 @@ the program would present a page containing:
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</p>
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<pre>Hi there, I love monkeys!</pre>
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<h2>Using <code>http</code> to serve wiki pages</h2>
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<h2>Using <code>net/http</code> to serve wiki pages</h2>
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<p>
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To use the <code>http</code> package, it must be imported:
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To use the <code>net/http</code> package, it must be imported:
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</p>
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<pre>
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import (
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"fmt"
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<b>"http"</b>
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<b>"net/http"</b>
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"io/ioutil"
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"os"
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)
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</pre>
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@ -361,14 +352,17 @@ func main() {
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<p>
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Let's create some page data (as <code>test.txt</code>), compile our code, and
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try serving a wiki page:
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try serving a wiki page.
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</p>
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<p>
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Open <code>test.txt</code> file in your editor, and save the string "Hello world" (without quotes)
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in it.
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</p>
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<pre>
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$ echo "Hello world" > test.txt
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$ 8g wiki.go
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$ 8l wiki.8
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$ ./8.out
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$ go build wiki.go
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$ ./wiki
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</pre>
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<p>
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@ -426,19 +420,17 @@ This function will work fine, but all that hard-coded HTML is ugly.
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Of course, there is a better way.
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</p>
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<h2>The <code>template</code> package</h2>
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<h2>The <code>html/template</code> package</h2>
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<p>
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The <code>template</code> package is part of the Go standard library.
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(A new template package is coming; this code lab will be updated soon.)
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We can
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use <code>template</code> to keep the HTML in a separate file, allowing
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us to change the layout of our edit page without modifying the underlying Go
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code.
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The <code>html/template</code> package is part of the Go standard library.
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We can use <code>html/template</code> to keep the HTML in a separate file,
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allowing us to change the layout of our edit page without modifying the
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underlying Go code.
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</p>
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<p>
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First, we must add <code>template</code> to the list of imports:
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First, we must add <code>html/template</code> to the list of imports:
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</p>
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<pre>
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@ -446,7 +438,7 @@ import (
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"http"
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"io/ioutil"
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"os"
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<b>"template"</b>
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<b>"html/template"</b>
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)
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</pre>
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@ -482,7 +474,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
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</pre>
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<p>
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The function <code>template.ParseFile</code> will read the contents of
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The function <code>template.ParseFiles</code> will read the contents of
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<code>edit.html</code> and return a <code>*template.Template</code>.
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</p>
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@ -558,7 +550,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
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}
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func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
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t, _ := template.ParseFiles(tmpl+".html", nil)
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t, _ := template.ParseFiles(tmpl + ".html")
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t.Execute(w, p)
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}
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</pre>
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@ -570,10 +562,11 @@ The handlers are now shorter and simpler.
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<h2>Handling non-existent pages</h2>
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<p>
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What if you visit <code>/view/APageThatDoesntExist</code>? The program will
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crash. This is because it ignores the error return value from
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<code>loadPage</code>. Instead, if the requested Page doesn't exist, it should
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redirect the client to the edit Page so the content may be created:
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What if you visit <a href="http://localhost:8080/view/APageThatDoesntExist">
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<code>/view/APageThatDoesntExist</code></a>? The program will crash. This is
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because it ignores the error return value from <code>loadPage</code>. Instead,
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if the requested Page doesn't exist, it should redirect the client to the edit
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Page so the content may be created:
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</p>
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<pre>
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@ -643,7 +636,7 @@ First, let's handle the errors in <code>renderTemplate</code>:
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<pre>
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func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
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t, err := template.ParseFiles(tmpl+".html", nil)
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t, err := template.ParseFiles(tmpl + ".html")
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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@ -976,9 +969,8 @@ Recompile the code, and run the app:
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</p>
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<pre>
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$ 8g wiki.go
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$ 8l wiki.8
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$ ./8.out
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$ go build wiki.go
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$ ./wiki
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</pre>
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<p>
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@ -8,10 +8,10 @@ cleanup() {
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}
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trap cleanup 0 INT
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gomake get.bin
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make get.bin
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addr=$(./get.bin -addr)
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sed s/:8080/$addr/ < final.go > final-test.go
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gomake final-test.bin
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make final-test.bin
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(./final-test.bin) &
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wiki_pid=$!
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|
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|
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@ -6,8 +6,8 @@ Covered in this codelab:
|
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</p>
|
||||
<ul>
|
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<li>Creating a data structure with load and save methods</li>
|
||||
<li>Using the <code>http</code> package to build web applications
|
||||
<li>Using the <code>template</code> package to process HTML templates</li>
|
||||
<li>Using the <code>net/http</code> package to build web applications
|
||||
<li>Using the <code>html/template</code> package to process HTML templates</li>
|
||||
<li>Using the <code>regexp</code> package to validate user input</li>
|
||||
<li>Using closures</li>
|
||||
</ul>
|
||||
@ -18,21 +18,18 @@ Assumed knowledge:
|
||||
<ul>
|
||||
<li>Programming experience</li>
|
||||
<li>Understanding of basic web technologies (HTTP, HTML)</li>
|
||||
<li>Some UNIX command-line knowledge</li>
|
||||
<li>Some UNIX/DOS command-line knowledge</li>
|
||||
</ul>
|
||||
|
||||
<h2>Getting Started</h2>
|
||||
|
||||
<p>
|
||||
At present, you need to have a Linux, OS X, or FreeBSD machine to run Go. If
|
||||
you don't have access to one, you could set up a Linux Virtual Machine (using
|
||||
<a href="http://www.virtualbox.org/">VirtualBox</a> or similar) or a
|
||||
<a href="http://www.google.com/search?q=virtual+private+server">Virtual
|
||||
Private Server</a>.
|
||||
At present, you need to have a FreeBSD, Linux, OS X, or Windows machine to run Go.
|
||||
We will use <code>$</code> to represent the command prompt.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Install Go (see the <a href="http://golang.org/doc/install.html">Installation Instructions</a>).
|
||||
Install Go (see the <a href="/doc/install.html">Installation Instructions</a>).
|
||||
</p>
|
||||
|
||||
<p>
|
||||
@ -40,8 +37,8 @@ Make a new directory for this codelab and cd to it:
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
$ mkdir ~/gowiki
|
||||
$ cd ~/gowiki
|
||||
$ mkdir gowiki
|
||||
$ cd gowiki
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
@ -55,15 +52,13 @@ package main
|
||||
import (
|
||||
"fmt"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
)
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
We import the <code>fmt</code>, <code>ioutil</code> and <code>os</code>
|
||||
packages from the Go standard library. Later, as we implement additional
|
||||
functionality, we will add more packages to this <code>import</code>
|
||||
declaration.
|
||||
We import the <code>fmt</code> and <code>ioutil</code> packages from the Go
|
||||
standard library. Later, as we implement additional functionality, we will
|
||||
add more packages to this <code>import</code> declaration.
|
||||
</p>
|
||||
|
||||
<h2>Data Structures</h2>
|
||||
@ -81,8 +76,8 @@ the title and body.
|
||||
|
||||
<p>
|
||||
The type <code>[]byte</code> means "a <code>byte</code> slice".
|
||||
(See <a href="http://golang.org/doc/effective_go.html#slices">Effective Go</a>
|
||||
for more on slices.)
|
||||
(See <a href="/doc/articles/slices_usage_and_internals.html">Slices: usage and
|
||||
internals</a> for more on slices.)
|
||||
The <code>Body</code> element is a <code>[]byte</code> rather than
|
||||
<code>string</code> because that is the type expected by the <code>io</code>
|
||||
libraries we will use, as you'll see below.
|
||||
@ -161,9 +156,8 @@ function to return <code>*Page</code> and <code>error</code>.
|
||||
<p>
|
||||
Callers of this function can now check the second parameter; if it is
|
||||
<code>nil</code> then it has successfully loaded a Page. If not, it will be an
|
||||
<code>error</code> that can be handled by the caller (see the <a
|
||||
href="http://golang.org/pkg/os/#Error">os package documentation</a> for
|
||||
details).
|
||||
<code>error</code> that can be handled by the caller (see the
|
||||
<a href="/doc/go_spec.html#Errors">language specification</a> for details).
|
||||
</p>
|
||||
|
||||
<p>
|
||||
@ -188,23 +182,21 @@ You can compile and run the program like this:
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
$ 8g wiki.go
|
||||
$ 8l wiki.8
|
||||
$ ./8.out
|
||||
$ go build wiki.go
|
||||
$ ./wiki
|
||||
This is a sample page.
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
(The <code>8g</code> and <code>8l</code> commands are applicable to
|
||||
<code>GOARCH=386</code>. If you're on an <code>amd64</code> system,
|
||||
substitute 6's for the 8's.)
|
||||
(If you're using Windows you must type "<code>wiki</code>" without the
|
||||
"<code>./</code>" to run the program.)
|
||||
</p>
|
||||
|
||||
<p>
|
||||
<a href="part1.go">Click here to view the code we've written so far.</a>
|
||||
</p>
|
||||
|
||||
<h2>Introducing the <code>http</code> package (an interlude)</h2>
|
||||
<h2>Introducing the <code>net/http</code> package (an interlude)</h2>
|
||||
|
||||
<p>
|
||||
Here's a full working example of a simple web server:
|
||||
@ -256,18 +248,17 @@ the program would present a page containing:
|
||||
</p>
|
||||
<pre>Hi there, I love monkeys!</pre>
|
||||
|
||||
<h2>Using <code>http</code> to serve wiki pages</h2>
|
||||
<h2>Using <code>net/http</code> to serve wiki pages</h2>
|
||||
|
||||
<p>
|
||||
To use the <code>http</code> package, it must be imported:
|
||||
To use the <code>net/http</code> package, it must be imported:
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
import (
|
||||
"fmt"
|
||||
<b>"http"</b>
|
||||
<b>"net/http"</b>
|
||||
"io/ioutil"
|
||||
"os"
|
||||
)
|
||||
</pre>
|
||||
|
||||
@ -318,14 +309,17 @@ any requests under the path <code>/view/</code>.
|
||||
|
||||
<p>
|
||||
Let's create some page data (as <code>test.txt</code>), compile our code, and
|
||||
try serving a wiki page:
|
||||
try serving a wiki page.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Open <code>test.txt</code> file in your editor, and save the string "Hello world" (without quotes)
|
||||
in it.
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
$ echo "Hello world" > test.txt
|
||||
$ 8g wiki.go
|
||||
$ 8l wiki.8
|
||||
$ ./8.out
|
||||
$ go build wiki.go
|
||||
$ ./wiki
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
@ -366,19 +360,17 @@ This function will work fine, but all that hard-coded HTML is ugly.
|
||||
Of course, there is a better way.
|
||||
</p>
|
||||
|
||||
<h2>The <code>template</code> package</h2>
|
||||
<h2>The <code>html/template</code> package</h2>
|
||||
|
||||
<p>
|
||||
The <code>template</code> package is part of the Go standard library.
|
||||
(A new template package is coming; this code lab will be updated soon.)
|
||||
We can
|
||||
use <code>template</code> to keep the HTML in a separate file, allowing
|
||||
us to change the layout of our edit page without modifying the underlying Go
|
||||
code.
|
||||
The <code>html/template</code> package is part of the Go standard library.
|
||||
We can use <code>html/template</code> to keep the HTML in a separate file,
|
||||
allowing us to change the layout of our edit page without modifying the
|
||||
underlying Go code.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
First, we must add <code>template</code> to the list of imports:
|
||||
First, we must add <code>html/template</code> to the list of imports:
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
@ -386,7 +378,7 @@ import (
|
||||
"http"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
<b>"template"</b>
|
||||
<b>"html/template"</b>
|
||||
)
|
||||
</pre>
|
||||
|
||||
@ -409,7 +401,7 @@ HTML:
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
The function <code>template.ParseFile</code> will read the contents of
|
||||
The function <code>template.ParseFiles</code> will read the contents of
|
||||
<code>edit.html</code> and return a <code>*template.Template</code>.
|
||||
</p>
|
||||
|
||||
@ -474,10 +466,11 @@ The handlers are now shorter and simpler.
|
||||
<h2>Handling non-existent pages</h2>
|
||||
|
||||
<p>
|
||||
What if you visit <code>/view/APageThatDoesntExist</code>? The program will
|
||||
crash. This is because it ignores the error return value from
|
||||
<code>loadPage</code>. Instead, if the requested Page doesn't exist, it should
|
||||
redirect the client to the edit Page so the content may be created:
|
||||
What if you visit <a href="http://localhost:8080/view/APageThatDoesntExist">
|
||||
<code>/view/APageThatDoesntExist</code></a>? The program will crash. This is
|
||||
because it ignores the error return value from <code>loadPage</code>. Instead,
|
||||
if the requested Page doesn't exist, it should redirect the client to the edit
|
||||
Page so the content may be created:
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
@ -753,9 +746,8 @@ Recompile the code, and run the app:
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
$ 8g wiki.go
|
||||
$ 8l wiki.8
|
||||
$ ./8.out
|
||||
$ go build wiki.go
|
||||
$ ./wiki
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user