var data sendText
	data.Touser = "@all"
	data.Msgtype = "text"
	data.Agentid = 1000002
	data.Text.Content = "你的快递已到,请携带工卡前往邮件中心领取。\n出发前可查看<a href=\"http://work.weixin.qq.com\">邮件中心视频实况</a>,聪明避开排队。"
	data.Safe = 0
	bs, err := json.Marshal(data)
	checkErr(err)

	req := bytes.NewBuffer([]byte(bs))
	
	body_type := "application/json;charset=utf-8"
	resp, err := http.Post(post_url,body_type,req)
	checkErr(err)

	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	checkErr(err)

	log.Print(string(body))

完整代码:

package main

import (
    "fmt"
    "io/ioutil"
    //    "log"
    "net/http"
    //    "strings"
    "bytes"
    "encoding/json"
)

type User struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

func main() {
    resp, _ := http.Get("http://10.67.2.252:8080/?a=123456&b=aaa&b=bbb")
    defer resp.Body.Close()
    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))

    var user User
    user.Name = "aaa"
    user.Age = 99
    if bs, err := json.Marshal(user); err == nil {
        //        fmt.Println(string(bs))
        req := bytes.NewBuffer([]byte(bs))
        tmp := `{"name":"junneyang", "age": 88}`
        req = bytes.NewBuffer([]byte(tmp))

        body_type := "application/json;charset=utf-8"
        resp, _ = http.Post("http://10.67.2.252:8080/test/", body_type, req)
        body, _ = ioutil.ReadAll(resp.Body)
        fmt.Println(string(body))
    } else {
        fmt.Println(err)
    }

    client := &http.Client{}
    request, _ := http.NewRequest("GET", "http://10.67.2.252:8080/?a=123456&b=aaa&b=bbb", nil)
    request.Header.Set("Connection", "keep-alive")
    response, _ := client.Do(request)
    if response.StatusCode == 200 {
        body, _ := ioutil.ReadAll(response.Body)
        fmt.Println(string(body))
    }

    req := `{"name":"junneyang", "age": 88}`
    req_new := bytes.NewBuffer([]byte(req))
    request, _ = http.NewRequest("POST", "http://10.67.2.252:8080/test/", req_new)
    request.Header.Set("Content-type", "application/json")
    response, _ = client.Do(request)
    if response.StatusCode == 200 {
        body, _ := ioutil.ReadAll(response.Body)
        fmt.Println(string(body))
    }
}

参考:https://www.cnblogs.com/junneyang/p/6211190.html