• 表单传输为post请求，http常见的传输格式为四种：
      • application/json
      • application/x-www-form-urlencoded
      • application/xml
      • multipart/form-data
    • 表单参数可以通过PostForm()方法获取，该方法默认解析的是x-www-form-urlencoded或from-data格式的参数
      1. <!DOCTYPE html>
      2. <html lang="en">
      3. <head>
      4.   <meta charset="UTF-8">
      5.   <meta name="viewport" content="width=device-width, initial-scale=1.0">
      6.   <meta http-equiv="X-UA-Compatible" content="ie=edge">
      7.   <title>Document</title>
      8. </head>
      9. <body>
      10.   <form action="http://localhost:8080/form" method="post" action="application/x-www-form-urlencoded">
      11.       用户名：<input type="text" name="username" placeholder="请输入你的用户名">  <br>
      12.       密&nbsp;&nbsp;&nbsp;码：<input type="password" name="userpassword" placeholder="请输入你的密码">  <br>
      13.       <input type="submit" value="提交">
      14.   </form>
      15. </body>
      16. </html>
      ```go package main

    // import ( “fmt” “net/http”

    1. "github.com/gin-gonic/gin"

    )

    func main() { r := gin.Default() r.POST(“/form”, func(c *gin.Context) { types := c.DefaultPostForm(“type”, “post”) username := c.PostForm(“username”) password := c.PostForm(“userpassword”) // c.String(http.StatusOK, fmt.Sprintf(“username:%s,password:%s,type:%s”, username, password, types)) c.String(http.StatusOK, fmt.Sprintf(“username:%s,password:%s,type:%s”, username, password, types)) }) r.Run() } ``` 输出结果：
    表单参数 - 图1
    表单参数 - 图2