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Go-based web access parameters

2022-08-09 13:02:00 【51CTO】

webThere are generally available parametersheader字段,body字段,Form字段

1、Get it firstheader字段

       
       package 
       
       main
       
       import (
       
       "fmt"
       
       "net/http"
       
)
       
       func 
       
       header(
       
       w 
       
       http
       
       .
       
       ResponseWriter, 
       
       r 
       
       *
       
       http
       
       .
       
       Request) {
       
       h :
       
       = 
       
       r
       
       .
       
       Header
       
       fmt
       
       .
       
       Fprintln(
       
       w, 
       
       h)
       
}
       
       func 
       
       main() {
       
       server :
       
       = 
       
       http
       
       .
       
       Server{
       
       Addr: 
       
       "127.0.0.1:8080",
       
  }
       
       http
       
       .
       
       HandleFunc(
       
       "/header", 
       
       header)
       
       server
       
       .
       
       ListenAndServe()
       
}
      
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这样r.Header获取到所有Header的参数,If you want to get one of them use

       
       fmt
       
       .
       
       Fprintln(
       
       w, 
       
       h[
       
       "User-Agent"])
       
       fmt
       
       .
       
       Fprintln(
       
       w, 
       
       h
       
       .
       
       Get(
       
       "User-Agent"))
      
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这2The difference between the two statements is that the first returns a string slice,The second returns string form.

2、获取body字段

       
       func 
       
       header(
       
       w 
       
       http
       
       .
       
       ResponseWriter, 
       
       r 
       
       *
       
       http
       
       .
       
       Request) {
       
       len :
       
       = 
       
       r
       
       .
       
       ContentLength
       
       body :
       
       = 
       
       make([]
       
       byte, 
       
       len)
       
       r
       
       .
       
       Body
       
       .
       
       Read(
       
       body)
       
       fmt
       
       .
       
       Fprintln(
       
       w, 
       
       string(
       
       body))
       
}
      
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3、Form字段

       
       r
       
       .
       
       ParseForm()
       
       r
       
       .
       
       Form
      
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r.ParseForm()is to parse the parameters first,这样r.Form才能获取到.For example, there are parametersabc=111,

使用r.Form["abc"]获取参数,也可以使用r.PostForm.

Form和PostForm之间的区别在于Form可以获取到URL后面的参数和post里面的参数,

PostForm只能获取post中的参数,也就是说Form是可以获取到get方法参数.

       
       r
       
       .
       
       FormValue(
       
       "hello")
       
       r
       
       .
       
       PostFormValue(
       
       "hello")
      
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这2In the middle way, it is not necessary to executer.ParseForm()parameters can be obtained.

4、MultipartForm

       
       r
       
       .
       
       ParseMultipartForm(
       
       1024)
       
       fmt
       
       .
       
       Fprintln(
       
       w, 
       
       r
       
       .
       
       MultipartForm)
      
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从multipartHow many bytes of data are taken out of the encoded form.MultipartFormOnly form key-value pairs can be included and not includedURL键值对.

获取上传文件2中方式

1、r.ParseMultipartForm(1024)

       
       r
       
       .
       
       MultipartForm
       
       .
       
       File[
       
       "file"]
      
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2、r.FormFile("file")

       
       func 
       
       process(
       
       w 
       
       http
       
       .
       
       ResponseWriter, 
       
       r 
       
       *
       
       http
       
       .
       
       Request) {
       
       r
       
       .
       
       ParseMultipartForm(
       
       1024)
       
       fileHeader :
       
       = 
       
       r
       
       .
       
       MultipartForm
       
       .
       
       File[
       
       "uploaded"][
       
       0]
       
       file, 
       
       err :
       
       = 
       
       fileHeader
       
       .
       
       Open()  
       
       if 
       
       err 
       
       == 
       
       nil {
       
       data, 
       
       err :
       
       = 
       
       ioutil
       
       .
       
       ReadAll(
       
       file)
       
       if 
       
       err 
       
       == 
       
       nil {
       
       fmt
       
       .
       
       Fprintln(
       
       w, 
       
       string(
       
       data))
       
    }
       
  }
       
}
       
       func 
       
       process(
       
       w 
       
       http
       
       .
       
       ResponseWriter, 
       
       r 
       
       *
       
       http
       
       .
       
       Request) {
       
       file, 
       
       _, 
       
       err :
       
       = 
       
       r
       
       .
       
       FormFile(
       
       "uploaded")  
       
       if 
       
       err 
       
       == 
       
       nil {
       
       data, 
       
       err :
       
       = 
       
       ioutil
       
       .
       
       ReadAll(
       
       file)
       
       if 
       
       err 
       
       == 
       
       nil {
       
       fmt
       
       .
       
       Fprintln(
       
       w, 
       
       string(
       
       data))
       
    }
       
  }
       
}
      
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https://yzsam.com/2022/221/202208091152353861.html

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