golang json.Marshal 特殊html字符被转义解决方案

go语言提供了json的编解码包，json字符串作为参数值传输时发现，json.Marshal生成json特殊字符<、>、&会被转义。

type Test struct {
    Content     string
}
func main() {
    t := new(Test)
    t.Content = "http://www.baidu.com?id=123&test=1"
    jsonByte, _ := json.Marshal(t)
    fmt.Println(string(jsonByte))
}

{"Content":"http://www.baidu.com?id=123\u0026test=1"}
Process finished with exit code 0

GoDoc描述

String values encode as JSON strings coerced to valid UTF-8,
replacing invalid bytes with the Unicode replacement rune.
The angle brackets “<” and “>” are escaped to “\u003c” and “\u003e”
to keep some browsers from misinterpreting JSON output as HTML.
Ampersand “&” is also escaped to “\u0026” for the same reason.
This escaping can be disabled using an Encoder that had SetEscapeHTML(false) alled on it.

json.Marshal 默认 escapeHtml 为true,会转义 <、>、&

func Marshal(v interface{}) ([]byte, error) {
    e := &encodeState{}
    err := e.marshal(v, encOpts{escapeHTML: true})
    if err != nil {
        return nil, err
    }
    return e.Bytes(), nil
}

---

解决方案

方法一：

content = strings.Replace(content, "\\u003c", "<", -1)
content = strings.Replace(content, "\\u003e", ">", -1)
content = strings.Replace(content, "\\u0026", "&", -1)

这种方式比较直接，硬性字符串替换。比较憨厚

方法二：

文档中写到This escaping can be disabled using an Encoder that had SetEscapeHTML(false) alled on it.

1. 我们先创建一个buffer用于存储json
2. 创建一个jsonencoder
3. 设置html编码为false

type Test struct {
    Content     string
}
func main() {
    t := new(Test)
    t.Content = "http://www.baidu.com?id=123&test=1"
    bf := bytes.NewBuffer([]byte{})
    jsonEncoder := json.NewEncoder(bf)
    jsonEncoder.SetEscapeHTML(false)
    jsonEncoder.Encode(t)
    fmt.Println(bf.String())
}

{"Content":"http://www.baidu.com?id=123&test=1"}
Process finished with exit code 0

查看文档和源码还是解决问题的好方法