go语言之进阶篇json解析到结构体,Unmarshal使用
1、json解析到结构体
示例:
package main import ( "encoding/json" "fmt" ) type IT struct { Company string `json: "company" ` Subjects []string `json: "subjects" ` //二次编码 IsOk bool `json: "isok" ` Price float64 `json: "price" ` } func main() { jsonBuf := ` { "company" : "itcast" , "subjects" : [ "Go" , "C++" , "Python" , "Test" ], "isok" : true, "price" : 666.666 }` var tmp IT //定义一个结构体变量 err := json.Unmarshal([]byte(jsonBuf), &tmp) //第二个参数要地址传递 if err != nil { fmt.Println( "err = " , err) return } //fmt.Println("tmp = ", tmp) fmt.Printf( "tmp = %+v\n" , tmp) } |
执行结果:
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tmp = {Company:itcast Subjects:[Go C++ Python Test] IsOk:true Price:666.666} |
示例2: 定义结构体,解析你想生成的字段
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package main import ( "encoding/json" "fmt" ) type IT struct { Company string `json: "company" ` Subjects []string `json: "subjects" ` //二次编码 IsOk bool `json: "isok" ` Price float64 `json: "price" ` } func main() { jsonBuf := ` { "company" : "itcast" , "subjects" : [ "Go" , "C++" , "Python" , "Test" ], "isok" : true, "price" : 666.666 }` var tmp IT //定义一个结构体变量 err := json.Unmarshal([]byte(jsonBuf), &tmp) //第二个参数要地址传递 if err != nil { fmt.Println( "err = " , err) return } type IT2 struct { Subjects []string `json: "subjects" ` //二次编码 } var tmp2 IT2 err = json.Unmarshal([]byte(jsonBuf), &tmp2) //第二个参数要地址传递 if err != nil { fmt.Println( "err = " , err) return } fmt.Printf( "tmp2 = %+v\n" , tmp2) } |
执行结果:
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tmp2 = {Subjects:[Go C++ Python Test]} |