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go/doc/progs/json1.go

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// run
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"encoding/json"
"log"
"reflect"
)
type Message struct {
Name string
Body string
Time int64
}
// STOP OMIT
func Encode() {
m := Message{"Alice", "Hello", 1294706395881547000}
b, err := json.Marshal(m)
if err != nil {
panic(err)
}
expected := []byte(`{"Name":"Alice","Body":"Hello","Time":1294706395881547000}`)
if !reflect.DeepEqual(b, expected) {
log.Panicf("Error marshalling %q, expected %q, got %q.", m, expected, b)
}
}
func Decode() {
b := []byte(`{"Name":"Alice","Body":"Hello","Time":1294706395881547000}`)
var m Message
err := json.Unmarshal(b, &m)
if err != nil {
panic(err)
}
expected := Message{
Name: "Alice",
Body: "Hello",
Time: 1294706395881547000,
}
if !reflect.DeepEqual(m, expected) {
log.Panicf("Error unmarshalling %q, expected %q, got %q.", b, expected, m)
}
m = Message{
Name: "Alice",
Body: "Hello",
Time: 1294706395881547000,
}
// STOP OMIT
}
func PartialDecode() {
b := []byte(`{"Name":"Bob","Food":"Pickle"}`)
var m Message
err := json.Unmarshal(b, &m)
// STOP OMIT
if err != nil {
panic(err)
}
expected := Message{
Name: "Bob",
}
if !reflect.DeepEqual(expected, m) {
log.Panicf("Error unmarshalling %q, expected %q, got %q.", b, expected, m)
}
}
func main() {
Encode()
Decode()
PartialDecode()
}