Go语言：RESTful API接口在服务端读取POST的JSON数据

如果客户端POST表单数据则服务端可以直接调用Request的ParseForm()函数来获取对应参数和取值，而RESTful API接口POST的是JSON数据，服务端需要获取POST消息体的原始数据，方法如下：

server.go

package main

import (
        "fmt"
        "io"
        "io/ioutil"
        "log"
        "net/http"
)

func main() {
        handler := func(w http.ResponseWriter, req *http.Request) {
                b, e := ioutil.ReadAll(req.Body)

                if e != nil {
                        fmt.Printf("%v\n", e)
                } else {
                        fmt.Printf("%s\n", string(b))
                }

                io.WriteString(w, "OK\n")
        }

        http.HandleFunc("/", handler)
        log.Fatal(http.ListenAndServe(":8889", nil))
}

client.go

package main

import (
        "bytes"
        "fmt"
        "io/ioutil"
        "log"
        "net/http"
        "time"
)

func main() {

        url := "http://127.0.0.1:8889/"

        data := []byte(`
                {
                   "book":[
                      {
                         "id":"444",
                         "language":"C",
                         "edition":"First",
                         "author":"Dennis Ritchie "
                      },
                      {
                         "id":"555",
                         "language":"C++",
                         "edition":"second",
                         "author":" Bjarne Stroustrup "
                      }
                   ]
                }
        `)

        req, err := http.NewRequest("POST", url, bytes.NewBuffer(data))
        if err != nil {
                log.Fatal("Error reading request. ", err)
        }
        // Set client timeout
        client := &http.Client{Timeout: time.Second * 10}
        resp, err := client.Do(req)

        if err != nil {
                log.Fatal("Error reading response. ", err)
        }
        defer resp.Body.Close()

        fmt.Println("response status:", resp.StatusCode)

        body, err := ioutil.ReadAll(resp.Body)
        if err != nil {
                log.Fatal("Error reading body. ", err)
        }

        fmt.Printf("response body:%s\n", body)
}

测试从客户端向服务端POST JSON数据：

服务端输出：

                {
                   "book":[
                      {
                         "id":"444",
                         "language":"C",
                         "edition":"First",
                         "author":"Dennis Ritchie "
                      },
                      {
                         "id":"555",
                         "language":"C++",
                         "edition":"second",
                         "author":" Bjarne Stroustrup "
                      }
                   ]
                }

客户端输出：

response status: 200
response body:OK