总结golang解析json字符串出现的坑

长整型数字精度丢失

import (
    "bytes"
    "encoding/json"
)

...
const userJson=`{"name":"Harvey","id":1514889703642370048}`
userInfo map[string]interface{}
infoBytes := []byte(userJson)
json.Unmarshal(infoBytes, &userInfo)
// json数值类型被定义为 interface{}, 使用 Unmarshal 方法后，只能被断言为float64
uid := userInfo["id"].(float64)

func JsonDecodeUseNumber(infoBytes []byte, result interface{}) error {    
    decoder := json.NewDecoder(bytes.NewReader(infoBytes))
    // 未设置UseNumber, 长整型会丢失精度
    decoder.UseNumber()
    return decoder.Decode(result)
}

JsonDecodeUseNumber(infoBytes, &userInfo)
uidJNum := userInfo["id"].(json.Number)
uid := uidJNum.Int64()
...

jsonNumberjsonNumberinterface{}json.Unmarshalfloat64UseNumber()interface{}json.Number

json字符串包含非法字符

json.Unmarshal invalid character '\n' in string literal

import (
    "bytes"
    "encoding/json"
)

...
prodJson := `{"hel": "doafd",
"xxxdf": "aoifjadfoweih"}`
prodBytes := []byte(prodJson)
for i, ch := range prodBytes {
    switch {
        case ch > '~':
    prodBytes[i] = ' '
    case ch == '\r', ch == '\n', ch == '\t', ch < ' ':
    prodBytes[i] = ' '
    }
}
pd := map[string]string{}
json.Unmarshal(prodBytes, &pd)
...