HttpClient二post带json数据的请求与接收

àì夳堔傛蜴生んèń 2022-03-28 07:10 556阅读 0赞

**目录**

post发送json请求

接收端

测试

--------------------

# post发送json请求 #

直接在上一节的基础上在spring boot的启动类上加方法

@RequestMapping("/testCallBackByHttp")
        public JSONObject testCallBackByHttp() throws Exception {
            Map<String, Object> paramsMap = new HashMap<>();
            paramsMap.put("name", "wh");//{"name":"wh"}
            paramsMap.put("password", "ale");
            String jsonString = JSONObject.toJSONString(paramsMap);
            System.out.println(jsonString);
    
            String respHtml = "";
            CloseableHttpClient httpclient = HttpClients.createDefault();
            HttpPost httpPost = new HttpPost("http://127.0.0.1:8080/callBackFor");
            RequestConfig requestConfig = RequestConfig.custom()
                    .setConnectTimeout(10000)
                    .setConnectionRequestTimeout(10000)
                    .setSocketTimeout(10000)
                    .build();
            httpPost.setConfig(requestConfig);
            httpPost.setHeader("Content-Type", "application/json;charset=UTF-8");//表示客户端发送给服务器端的数据格式
            //httpPost.setHeader("Accept", "*/*");这样也ok,只不过服务端返回的数据不一定为json
            httpPost.setHeader("Accept", "application/json");                    //表示服务端接口要返回给客户端的数据格式，
            StringEntity entity = new StringEntity(jsonString, ContentType.APPLICATION_JSON);
            httpPost.setEntity(entity);
    
            CloseableHttpResponse response = httpclient.execute(httpPost);
            int statusCode = response.getStatusLine().getStatusCode();
            //System.out.println(EntityUtils.toString(response.getEntity(), "UTF-8"));
            System.out.println(statusCode);//200
            if (statusCode == HttpStatus.SC_OK) {
                HttpEntity respEnt = response.getEntity();
                respHtml = EntityUtils.toString(respEnt, "UTF-8");
                System.out.println(respHtml);
                JSONObject jsonObject = JSONObject.parseObject(respHtml);//响应结果
                return jsonObject;
            }
            System.out.println(respHtml);
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("resp",respHtml);
            return jsonObject;
    
        }

# 接收端 #

@PostMapping("/callBackFor")
        public JSONObject callBackFor(HttpServletRequest request, @RequestBody String data) {
            /*
             *  String data               不可以接受json字符串，只能接收名为data的参数
             * @RequestBody String data 可以以json字符串的形式接收json字符串
             * @RequestBody JSONObject jsonObject 可以接收json字符串并转化为JSONObject对象
             * */
            Enumeration<String> parameterNames = request.getParameterNames();
            while (parameterNames.hasMoreElements()) {//传递json数据的时候request是没有表单参数的
                String parameterName = parameterNames.nextElement();
                System.out.println(parameterName + "===" + request.getParameter(parameterName));
                //System.out.println(parameterNames.nextElement()+"=="+request.getParameter(parameterNames.nextElement()));
            }
            System.out.println(data);//以{}包含的字符串
            //无论是@RequestBody String data还是@RequestBody JSONObject jsonObject 最后都要转换为后者,因此建议@RequestBody JSONObject jsonObject接收json字符串
            JSONObject jsonObject = JSONObject.parseObject(data);
            Set<Map.Entry<String, Object>> entries = jsonObject.entrySet();
            System.out.println("=====我是回调函数=====");
            for (Map.Entry<String, Object> entry : entries) {
                System.out.println(entry.getKey() + "--" + entry.getValue());
            }
            System.out.println("=====================");
            JSONObject result = new JSONObject();
            result.put("code", 1);
            result.put("msg", "调用成功！");
            return result;
        }

# 测试 #

启动springBoot 浏览器上输入  
[http://127.0.0.1:8080/testCallBackByHttp][http_127.0.0.1_8080_testCallBackByHttp]  
页面如下  
![在这里插入图片描述][20190109214920982.png]

控制台打印如下

![20190109214946328.png][]

[http_127.0.0.1_8080_testCallBackByHttp]: http://127.0.0.1:8080/testCallBackByHttp
[20190109214920982.png]: /images/20220328/7b1339f329ac4a8c9d74914157ef47f7.png
[20190109214946328.png]: /images/20220328/d0a67938d3a844f292c358db88ab83b9.png