621-Golang的表单数据

蔚落 2022-09-12 04:50 154阅读 0赞

## 数据接收 ##

**如何从前端接收数据，并把结果返回给前端**  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16]

**一个http的消息的结构如下：**

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 1]

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 2]  
![在这里插入图片描述][6f8367b1667e40d09c413aa8562713a5.png]  
![在这里插入图片描述][7ac0bc6771694e7fad3b9a9056f9a897.png]  
**q是权重的意思**  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 3]

## GET数据 ##

![在这里插入图片描述][5d01d01321094a1f807588864e884467.png]  
![在这里插入图片描述][12b592c93fa64954a89fd2c2ce0da6ce.png]

package main
    
    import (
      "fmt"
      "net/http"
      "github.com/gorilla/mux"
    )
    
    func main(){
        
      router:=mux.NewRouter()
      http.Handle("/", router)
    
      router.HandleFunc("/api", func(w http.ResponseWriter, req *http.Request){
        
        w.Write([]byte("abcd"))
    
        fmt.Printf("a=%s\n", req.FormValue("a"))//FormValue：表单的数据
        fmt.Printf("b=%s\n", req.FormValue("b"))
        fmt.Printf("name=%s\n", req.FormValue("name"))
      })
    
      http.ListenAndServe(":80", nil)
    }

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 4]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 5]

## POST数据 ##

![在这里插入图片描述][6e9776f04b974241b5e1781a30de5600.png]

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 6]

package main
    
    import (
      "fmt"
      "net/http"
      "github.com/gorilla/mux"
    )
    
    func main(){
        
      router:=mux.NewRouter()
      http.Handle("/", router)
    
    
      router.HandleFunc("/api", func(w http.ResponseWriter, req *http.Request){
        
        w.Write([]byte("abcd"))
    
        fmt.Printf("user=%s\n", req.FormValue("user"))
        fmt.Printf("pass=%s\n", req.FormValue("pass"))
      })
    
    
      http.ListenAndServe(":80", nil)
    }

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 7]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 8]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 9]  
**密码框变成…只是为了让人类看不到，服务器是可以知道的**

## 文件数据 ##

我们先修改一下表单

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 10]

package main
    
    import (
      "fmt"
      "net/http"
      "github.com/gorilla/mux"
    )
    
    func main(){
        
      router:=mux.NewRouter()
      http.Handle("/", router)
    
    
      router.HandleFunc("/api", func(w http.ResponseWriter, req *http.Request){
        
        w.Write([]byte("abcd"))
    
        file,header,err:=req.FormFile("f1")
        if err!=nil {
        panic(err)}
    
        fmt.Printf("%+v\n", header)
        fmt.Printf("%v\n", file)
      })
    
      http.ListenAndServe(":80", nil)
    }

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 11]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 12]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 13]  
**现在的这个文件虽然是给到服务器了，但是是保存在内存中，没有写入到磁盘，一旦服务器重启，就丢失了。  
我们创建一个文件夹upload，保存上传好的文件**

package main
    
    import (
      "net/http"
      "os"
      "github.com/gorilla/mux"
    )
    
    func main(){
        
      router:=mux.NewRouter()
      http.Handle("/", router)
    
      router.HandleFunc("/api", func(w http.ResponseWriter, req *http.Request){
        
        file,header,err:=req.FormFile("f1")
        if err!=nil {
        panic(err)}
        defer file.Close()
    
        buf:=make([]byte, 4096)
        wfile,err:=os.OpenFile(
          "./upload/"+header.Filename,
          os.O_WRONLY|os.O_CREATE,
          0600,
        )
        defer wfile.Close()
    
        //1.读取临时文件
        for n,err:=file.Read(buf);n>0;n,err=file.Read(buf) {
        
          if err!=nil {
        panic(err)}
    
          //2.写入正式文件
          n,err=wfile.Write(buf[0:n])
          if err!=nil {
        panic(err)}
        }
    
        w.Write([]byte("ok"))
      })
    
      http.ListenAndServe(":80", nil)
    }

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 14]

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