原文：https://blog.csdn.net/harryhare/article/details/80778066
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前端 js 请求
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>post test</title>>
<script>
function send(type) {
url = "http://127.0.0.1:8080/";
xhr = new XMLHttpRequest();
xhr.open("post", url, true);
var data;
if (type === "formdata") {
data = new FormData();
data.append("key", "value");
} else if (type === "json") {
xhr.setRequestHeader("Content-Type", "application/json");
data = JSON.stringify({"key": "value"});
} else if (type === "text") {
data = "key=value";
} else if (type === "www") {
// 这个header 其实是 传统post 表单的格式
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
data = "key=value";
}
xhr.send(data);
}
</script>
</head>
<body>
<div>
<input type="button" onclick="send('formdata')" value="FormData"/>
<br/>
<input type="button" onclick="send('json')" value="application/json"/>
<br/>
<input type="button" onclick="send('text')" value="text"/>
<br/>
<input type="button" onclick="send('www')" value="application/x-www-form-urlencoded"/>
</div>
</body>
</html>>
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后端处理
package main
import (
"fmt"
"net/http"
)
func IndexHandler(w http.ResponseWriter, r *http.Request) {
fmt.Println("before parse:")
printKey(r);
r.ParseForm()
fmt.Println("ParseForm:")
printKey(r);
r.ParseMultipartForm(2048)
fmt.Println("ParseMultipartForm:")
printKey(r);
}
func printKey( r *http.Request){
fmt.Println(r.Form["key"])
fmt.Println(r.PostForm["key"])
if r.MultipartForm!=nil {
fmt.Println(r.MultipartForm.Value["key"])
}
}
func main() {
fmt.Println("listening 8080")
http.HandleFunc("/", IndexHandler)
http.ListenAndServe(":8080", nil)
}
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get
http://localhost:8080/?key=value1
before parse:
[]
[]
ParseForm:
[value1]
[]
ParseMultipartForm:
[value1]
[]
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application/x-www-form-urlencoded:
before parse:
[]
[]
ParseForm:
[value]
[value]
ParseMultipartForm:
[value]
[value]
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FormData(MultipartForm)
before parse:
[]
[]
ParseForm:
[]
[]
ParseMultipartForm:
[value]
[value]
[value]
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综上，使用 go 时：
ParseMultipartForm 这个函数要单独调用
postform 中有的 form中一定有，MultipartForm 中有的 postform 和 form也一定有
参考：
四种格式：
https://blog.csdn.net/tTU1EvLDeLFq5btqiK/article/details/78734023
转码说明：
https://www.w3schools.com/tags/att_form_enctype.asp
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版权声明：本文为CSDN博主「harryhare」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/harryhare/java/article/details/80778066