go json解析Marshal和Unmarshal

约定不等于承诺〃 2022-06-17 09:43 194阅读 0赞

go语言提供一个json解析的包。见 [http://golang.org/pkg/encoding/json/][http_golang.org_pkg_encoding_json]

官方同时提供了一篇文章 JSON and Go 讲述json包的用法， 该文章同时存在中文翻译： JSON与Go 。

看过上述两篇文章后，基本使用应该就没问题了。

同时，贴几个官方的例子，方便理解。

### **Decoder** ###

package main 
    import ( 
        "encoding/json" 
        "fmt" 
        "io" 
        "log" 
        "strings" 
    ) 
    func main ( ) { 
        const jsonStream = ` 
            { "Name" : "Ed" , "Text" : "Knock knock." } 
            { "Name" : "Sam" , "Text" : "Who's there?" } 
            { "Name" : "Ed" , "Text" : "Go fmt." } 
            { "Name" : "Sam" , "Text" : "Go fmt who?" } 
            { "Name" : "Ed" , "Text" : "Go fmt yourself!" } 
        ` 
        type Message struct { 
            Name , Text string 
        } 
        dec := json. NewDecoder ( strings. NewReader ( jsonStream ) ) 
        for { 
            var m Message 
            if err := dec. Decode ( & m ) ; err == io. EOF { 
                break 
            } else if err != nil { 
                log . Fatal ( err ) 
            } 
            fmt. Printf ( "%s: %s \n " , m. Name , m. Text ) 
        } 
    }

### **Marshal**序列化json格式 ###

package main 
    import ( 
        "encoding/json" 
        "fmt" 
        "os" 
    ) 
    func main ( ) { 
        type ColorGroup struct { 
            ID     int 
            Name   string 
            Colors [ ] string 
        } 
        group := ColorGroup { 
            ID :    1 , 
            Name :   "Reds" , 
            Colors : [ ] string { "Crimson" , "Red" , "Ruby" , "Maroon" } , 
        } 
        b , err := json. Marshal ( group ) 
        if err != nil { 
            fmt. Println ( "error:" , err ) 
        } 
        os. Stdout . Write ( b ) 
    }

### **Unmarshal** 反序列化json格式 ###

package main 
    import ( 
        "encoding/json" 
        "fmt" 
    ) 
    func main ( ) { 
        var jsonBlob = [ ] byte ( ` [ 
            { "Name" : "Platypus" , "Order" : "Monotremata" } , 
            { "Name" : "Quoll" ,     "Order" : "Dasyuromorphia" } 
        ] ` ) 
        type Animal struct { 
            Name  string 
            Order string 
        } 
        var animals [ ] Animal 
        err := json. Unmarshal ( jsonBlob , & animals ) 
        if err != nil { 
            fmt. Println ( "error:" , err ) 
        } 
        fmt. Printf ( "%+v" , animals ) 
    }

原文：[http://studygolang.com/articles/6742][http_studygolang.com_articles_6742]

[http_golang.org_pkg_encoding_json]: http://golang.org/pkg/encoding/json/
[http_studygolang.com_articles_6742]: http://studygolang.com/articles/6742