go http client, http server

淩亂°似流年 2022-06-04 03:41 251阅读 0赞

Go语言中的HTTP client， server非常简单。具体如下。

## HTTP Server ##

package  main
    
    import (
            "fmt"
            "html"
            "io/ioutil"
            "log"
            "net/http"
    
    )
    
    
    func main() {
    
            http.HandleFunc("/bar", func (w http.ResponseWriter, r *http.Request){
                    fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.Path))
    
                    if r.Method == "POST" {
                            b, err := ioutil.ReadAll(r.Body)
                            if err != nil {
                                    log.Println("Read failed:", err)
                            }
                            defer r.Body.Close()
    
    
                            log.Println("b:", string(b))
                    } else {
    
                            log.Println("ONly support Post")
                            w.Write([]byte("Only support post"))
                    }
    
            })
    
            log.Fatal(http.ListenAndServe(":8080", nil))
    
    }

## HTTP Client ##

1.  GET方式
    
        package main
        
        import (
                "io/ioutil"
                "log"
                "net/http"
        
        )
        
        
        func main() {
        
                url := "http://127.0.0.1:8080/bar"
        
                resp, err := http.Get(url)
                if err != nil {
                        log.Println("Get failed:", err)
                        return
                }
        
                defer resp.Body.Close()
        
                if resp.StatusCode != http.StatusOK {
                        log.Println("statuscode:", resp.StatusCode)
        
                }
        
                content, err := ioutil.ReadAll(resp.Body)
                if err != nil {
                        log.Println("Read failed:", err)
                }
        
        
                log.Println("content:", string(content))
        
        }
2.  POST方式
    
        package main
        
        import (
                "bytes"
                "io/ioutil"
                "log"
                "net/http"
        
        )
        
        
        func main() {
        
                url := "http://127.0.0.1:8080/bar"
                contentType := "application/json;charset=utf-8"
        
                b := []byte("Hello, Server")
                body := bytes.NewBuffer(b)
        
                resp, err := http.Post(url, contentType, body)
                if err != nil {
                        log.Println("Post failed:", err)
                        return
                }
        
                defer resp.Body.Close()
        
        
                content, err := ioutil.ReadAll(resp.Body)
                if err != nil {
                        log.Println("Read failed:", err)
                        return
                }
        
        
                log.Println("content:", string(content))
        
        }

注意：  
response的Body使用后记得close，即：

> resp.Body.Close()

关于如何传递json格式数据，可以参考博文[go http 传递json数据][go http _json]

[go http _json]: http://blog.csdn.net/lanyang123456/article/details/78702873