golang--json使用笔记

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在json编码中，最麻烦的是json数组，下面记录一下我在json编码遇到的难题和解决的源代码：

如果要打包这种格式：

{"key":222,"msg":{"ed":"aaa","gf":"23.45","rs":"23"},"status":1}

代码如下：

package mainimport ("encoding/json""fmt")func main() {t := make(map[string]interface{})t["ed"] = "aaa"t["rs"] = "23"t["gf"] = "23.45"res := make(map[string]interface{})res["status"] = 1res["key"] = 222res["msg"] = tbody, err := json.Marshal(res)if err != nil {fmt.Println(err)return} else {fmt.Println(string(body))}}

如果要打包如下格式：

{"key":222,"msg":[{"ed":"aaa","gf":"23.45","rs":"23"}],"status":1}

代码如下：

package mainimport ("encoding/json""fmt")func main() {var rbody []map[string]interface{}t := make(map[string]interface{})t["ed"] = "aaa"t["rs"] = "23"t["gf"] = "23.45"rbody = append(rbody, t)res := make(map[string]interface{})res["status"] = 1res["key"] = 222res["msg"] = rbodybody, err := json.Marshal(res)if err != nil {fmt.Println(err)return} else {fmt.Println(string(body))}}

在解析json结构的时候，最麻烦是解析json数组，如解析：

{"key":222,"msg":[{"ed":"aaa","gf":"23.45","rs":"23"}],"status":1}

代码如下：

package mainimport ("encoding/json""fmt")type tt struct {Key    intMsg    []msgStatus int}type msg struct {Ed stringRs stringGf string}func main() {tests := tt{}body := `{"key":222,"msg":[{"ed":"aaa","gf":"23.45","rs":"23"}],"status":1}`jsonerr := json.Unmarshal([]byte(body), &tests)/*[]byte()是可以把string强制转换城byte*/if jsonerr != nil {fmt.Println(jsonerr)return}fmt.Println(tests.Key)fmt.Println(tests.Msg[0].Ed)}

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