golang -json-

golang struct to json html without escape

default state when struct value is html code output to json will covert to unicode

package main

import (
    "encoding/json"
    "fmt"
    "os"
)

func main() {
    type ColorGroup struct {
        ID     int
        Name   string
        Colors []string
    }
    group := ColorGroup{
        ID:     1,
        Name:   "Reds",
        Colors: []string{"<html> </html>", "Red", "Ruby", "Maroon"},
    }
    b, err := json.Marshal(group)
    if err != nil {
        fmt.Println("error:", err)
    }
    os.Stdout.Write(b)
}

result will be :

{"ID":1,"Name":"Reds","Colors":["u003chtmlu003e u003c/htmlu003e","Red","Ruby","Maroon"]}

after change:

package main

import (
    "encoding/json"
    "fmt"
    "os"
    "bytes"
)

func main() {
    type ColorGroup struct {
        ID     int
        Name   string
        Colors []string
    }
    group := ColorGroup{
        ID:     1,
        Name:   "Reds",
        Colors: []string{"<html> </html>", "Red", "Ruby", "Maroon"},
    }
    b, err := json.Marshal(group)
    if err != nil {
        fmt.Println("error:", err)
    }
    
    
    buffer := &bytes.Buffer{}
        encoder := json.NewEncoder(buffer)
        encoder.SetEscapeHTML(false)
        err2 := encoder.Encode(group)
        bytes:= buffer.Bytes() 
        fmt.Println(err2)
        
        os.Stdout.Write(bytes  )

    
    os.Stdout.Write(b)
}

https://play.golang.org/p/nWxBIc1Ig0z

result ：

<nil>
{"ID":1,"Name":"Reds","Colors":["<html> </html>","Red","Ruby","Maroon"]}
{"ID":1,"Name":"Reds","Colors":["u003chtmlu003e u003c/htmlu003e","Red","Ruby","Maroon"]}

example2:

package main

import "fmt"
import "encoding/json"
import "bytes"

type Track struct {
    XmlRequest string `json:"xmlRequest"`
}

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

func main() {
    message := Track{}
    message.XmlRequest = "<car><mirror>XML</mirror></car>"
    fmt.Println("Before Marshal", message)
    messageJSON, _ := message.JSON()
    fmt.Println("After marshal", string(messageJSON))
}

result:

Before Marshal {<car><mirror>XML</mirror></car>}
After marshal {"xmlRequest":"<car><mirror>XML</mirror></car>"}

refer: https://play.golang.org/p/FAH-XS-QMC

package main

import (
    "encoding/json"
    "log"
    "bytes"
    "fmt"
)

func main() {
    buf := new(bytes.Buffer)
    enc := json.NewEncoder(buf)
    enc.SetEscapeHTML(false)

    v := make(map[string]string)
    v["key"] = "value with <> symbols"
    if err := enc.Encode(&v); err != nil {
        log.Println(err)
    }

    fmt.Printf("json codec: %v", buf.String())
}

and result:

json codec: {"key":"value with <> symbols"}

refer :https://play.golang.org/p/SJM3KLkYW-

html code store in mongo has escaped and recover to html code

package main

import (
    "fmt"
    "html"
)

func main() {
    const s = `&quot;Fran &amp; Freddie&#39;s Diner&quot; &lt;tasty@example.com&gt;`
    fmt.Println(html.UnescapeString(s))
}

result:

"Fran & Freddie's Diner" <tasty@example.com>

refer : https://golang.org/pkg/html/#example_UnescapeString

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原文地址：https://www.cnblogs.com/lavin/p/golang-json-html-unescape-and-withnot-unicode.html