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go-json-marshal

2020.04.24

golang json.Marshal() html特殊字符会转义 解决方法

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) called 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
}

解决方法

直接替换

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

SetEscapeHTML(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

a generic solution for any struct

func JSONMarshal(t interface{}) ([]byte, error) {
  buffer := &bytes.Buffer{}
  encoder := json.NewEncoder(buffer)
  encoder.SetEscapeHTML(false)
  err := encoder.Encode(t)
  return buffer.Bytes(), err
}