github.com/zach-klippenstein/go@v0.0.0-20150108044943-fcfbeb3adf58/doc/progs/json1.go (about)

     1  // run
     2  
     3  // Copyright 2012 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import (
    10  	"encoding/json"
    11  	"log"
    12  	"reflect"
    13  )
    14  
    15  type Message struct {
    16  	Name string
    17  	Body string
    18  	Time int64
    19  }
    20  
    21  // STOP OMIT
    22  
    23  func Encode() {
    24  	m := Message{"Alice", "Hello", 1294706395881547000}
    25  	b, err := json.Marshal(m)
    26  
    27  	if err != nil {
    28  		panic(err)
    29  	}
    30  
    31  	expected := []byte(`{"Name":"Alice","Body":"Hello","Time":1294706395881547000}`)
    32  	if !reflect.DeepEqual(b, expected) {
    33  		log.Panicf("Error marshalling %q, expected %q, got %q.", m, expected, b)
    34  	}
    35  
    36  }
    37  
    38  func Decode() {
    39  	b := []byte(`{"Name":"Alice","Body":"Hello","Time":1294706395881547000}`)
    40  	var m Message
    41  	err := json.Unmarshal(b, &m)
    42  
    43  	if err != nil {
    44  		panic(err)
    45  	}
    46  
    47  	expected := Message{
    48  		Name: "Alice",
    49  		Body: "Hello",
    50  		Time: 1294706395881547000,
    51  	}
    52  
    53  	if !reflect.DeepEqual(m, expected) {
    54  		log.Panicf("Error unmarshalling %q, expected %q, got %q.", b, expected, m)
    55  	}
    56  
    57  	m = Message{
    58  		Name: "Alice",
    59  		Body: "Hello",
    60  		Time: 1294706395881547000,
    61  	}
    62  
    63  	// STOP OMIT
    64  }
    65  
    66  func PartialDecode() {
    67  	b := []byte(`{"Name":"Bob","Food":"Pickle"}`)
    68  	var m Message
    69  	err := json.Unmarshal(b, &m)
    70  
    71  	// STOP OMIT
    72  
    73  	if err != nil {
    74  		panic(err)
    75  	}
    76  
    77  	expected := Message{
    78  		Name: "Bob",
    79  	}
    80  
    81  	if !reflect.DeepEqual(expected, m) {
    82  		log.Panicf("Error unmarshalling %q, expected %q, got %q.", b, expected, m)
    83  	}
    84  }
    85  
    86  func main() {
    87  	Encode()
    88  	Decode()
    89  	PartialDecode()
    90  }