Go语言实现JSON解析的方法详解

package main
 
import (
    "encoding/json"
    "errors"
    "fmt"
)
 
var parseJsonError = errors.New("json parse error")
var toJsonError = errors.New("to json error")
 
type CustomJson struct {
    Name string
    Age  int
}
 
//序列化为json
func toJson(c *CustomJson) (string, error) {
    fmt.Printf("原始结构体: %v\n", c)
    if jsonStr, err := json.Marshal(c); err != nil {
        fmt.Println("Error =", err)
        return "", parseJsonError
    } else {
        return string(jsonStr), nil
    }
 
}
 
func main() {
    w := CustomJson{Name: "李四", Age: 30}
    result, _ := toJson(&w)
    fmt.Println(result)
}

package main
 
import (
    "encoding/json"
    "errors"
    "fmt"
)
 
var parseJsonError = errors.New("json parse error")
var toJsonError = errors.New("to json error")
 
type CustomJson struct {
    Name string
    Age  int
}
 
//反序列化为结构体对象
func parseJson(a string) (CustomJson, error) {
    fmt.Printf("原始字符串: %s\n", a)
    var c CustomJson
    if err := json.Unmarshal([]byte(a), &c); err != nil {
        fmt.Println("Error =", err)
        return c, parseJsonError
    }
    return c, nil
}
 
func main() {
    j := `{"Name": "张三", "Age": 19}`
    if p, e := parseJson(j); e == nil {
        fmt.Printf("转换对象为: %v\n", p)
    }
}

package main
 
import (
    "encoding/json"
    "errors"
    "fmt"
)
 
var parseJsonError = errors.New("json parse error")
var toJsonError = errors.New("to json error")
 
type CustomJson struct {
    Name string
    Age  int
}
 
//反序列化为map
func parseMap(a string) (map[string]interface{}, error) {
    fmt.Printf("原始字符串: %s\n", a)
    var m map[string]interface{}
    if err := json.Unmarshal([]byte(a), &m); err != nil {
        fmt.Println("Error =", err)
        return m, parseJsonError
    }
    for k, v := range m {
        fmt.Printf("k=%s,v类型为%T,v=%v\n", k, v, v)
    }
    return m, nil
}
 
func main() {
    j := `{"Name": "张三", "Age": 19}`
    if m, e := parseMap(j); e == nil {
        fmt.Printf("转换map为: %v\n", m)
    }
}

package main
 
import (
    "encoding/json"
    "fmt"
)
 
 
type TestJson struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}
 
 
func main() {
    j := `{"name": "张三", "age": 19}`
    var c TestJson
    if err := json.Unmarshal([]byte(j), &c); err != nil {
        fmt.Println("Error =", err)
    }
    fmt.Println(">>>>", c)
}