springBoot RestTemplate二http post传递json参数的多种方法

忘是亡心i 2022-03-28 14:54 2659阅读 0赞

**目录**

post请求json数据(添加请求头)

接收端

发送端

测试

post请求json数据(添加请求头)并传递表单参数

请求端

测试

restTemplate.exchange post请求json数据(添加请求头)并传递表单参数

请求端

post请求json数据(添加请求头) 直接传递jsonString数据

RestTemplateBuilder post请求直接传递jsonString数据

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

# post请求json数据(添加请求头) #

## 接收端 ##

@PostMapping("/callBackFor")
        public JSONObject callBackFor(HttpServletRequest request, @RequestBody JSONObject jsonObject) {
            /*
             *  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(jsonObject.toJSONString());//
    
            Enumeration<String> headerNames = request.getHeaderNames();
            while (headerNames.hasMoreElements()){
                String header = headerNames.nextElement();
                System.out.println(header+"=="+request.getHeader(header));
            }
    
            //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
            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;
        }

## 发送端 ##

/**
         * post请求json数据(添加请求头)
         */
        public static  void test1(){
            RestTemplate restTemplate = new RestTemplate();
    
            //创建请求头
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            String url = "http://localhost:8087/callBackFor";
    
            User student = new User("sansan",10);
            HttpEntity<User> entity = new HttpEntity<User>(student, headers);
            ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, entity, String.class);
            String user = responseEntity.getBody();//{"msg":"调用成功！","code":1}
            System.out.println(user);
        }

## 测试 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 1]

# post请求json数据(添加请求头)并传递表单参数 #

接收端不变

## 请求端 ##

/**
         * post请求json数据(添加请求头)并传递表单参数
         */
        public static  void test2(){
             RestTemplate restTemplate = new RestTemplate();
    
            //创建请求头
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
    
            String url = "http://localhost:8087/callBackFor?id={id}";
            Map<String, String> params = new HashMap<String, String>();
            params.put("id", "123");
            User student = new User("sansan",10);
            HttpEntity<User> entity = new HttpEntity<User>(student, headers);
            ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, entity, String.class, params);
            String user = responseEntity.getBody();//{"msg":"调用成功！","code":1}
            System.out.println(user);
        }

## 测试 ##

![在这里插入图片描述][20190110204407295.png]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 2]

# restTemplate.exchange post请求json数据(添加请求头)并传递表单参数 #

## 请求端 ##

/**
         * restTemplate.exchange post请求json数据(添加请求头)并传递表单参数
         * exchange可以发送HttpMethod.POST,DELE,GET,PUT请求；
         */
        public static  void test3(){
            RestTemplate restTemplate = new RestTemplate();
    
            //创建请求头
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
    
            String url = "http://localhost:8087/callBackFor?id={id}";
    
            //params是url中出现的路径变量
            Map<String, String> params = new HashMap<String, String>();
            params.put("id", "123");
            User student = new User("sansan",10);
    
            //entity包含请求的对象和消息头；
            HttpEntity<User> entity = new HttpEntity<User>(student, headers);
    
            ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, entity, String.class, params);
            String user = responseEntity.getBody();//{"msg":"调用成功！","code":1}
            System.out.println(user);
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 3]

# post请求json数据(添加请求头) 直接传递jsonString数据 #

/**
         * post请求json数据(添加请求头)  直接传递jsonString数据
         */
        public static  void test4(){
            RestTemplate restTemplate = new RestTemplate();
    
            //创建请求头
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            //也可以这样设置contentType
            //MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
            //headers.setContentType(type);
    
            //加不加Accept都可以
            //headers.add("Accept", MediaType.APPLICATION_JSON.toString());
    
            String url = "http://localhost:8087/callBackFor";
    
            User student = new User("sansan",19);
            String jsonString = JSONObject.toJSONString(student);
            System.out.println(jsonString);//{"age":10,"name":"sansan"}
    
            HttpEntity<String> entity = new HttpEntity<String>(jsonString, headers);
            ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, entity, String.class);
            String user = responseEntity.getBody();//{"msg":"调用成功！","code":1}
            System.out.println(user);
        }

![在这里插入图片描述][20190110204930757.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 4]

# RestTemplateBuilder post请求直接传递jsonString数据 #

/**
         * RestTemplateBuilder   post请求json数据(添加请求头)  直接传递jsonString数据
         */
        public static  void test5(){
            //RestTemplate restTemplate = new RestTemplate();
            RestTemplateBuilder restTemplateBuilder = new RestTemplateBuilder();
            RestTemplate restTemplate = restTemplateBuilder.build();
    
            //创建请求头
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            //也可以这样设置contentType
            //MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
            //headers.setContentType(type);
    
            //加不加Accept都可以
            //headers.add("Accept", MediaType.APPLICATION_JSON.toString());
    
            String url = "http://localhost:8087/callBackFor";
    
            User student = new User("sansan",19);
            String jsonString = JSONObject.toJSONString(student);
            System.out.println(jsonString);//{"age":10,"name":"sansan"}
    
            HttpEntity<String> entity = new HttpEntity<String>(jsonString, headers);
            ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, entity, String.class);
            String user = responseEntity.getBody();//{"msg":"调用成功！","code":1}
            System.out.println(user);
        }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70]: /images/20220328/099bd19d8071403ba7aba1400912183a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 1]: /images/20220328/eef981a43e7c4ded958b75ef2c691088.png
[20190110204407295.png]: /images/20220328/c7605d13c65d4522a77269ca32fe413c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 2]: /images/20220328/8883118fdded4652a6d9253479a47b6e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 3]: /images/20220328/6d4c5eb986b9464084a8290b475b589b.png
[20190110204930757.png]: /images/20220328/87c58c91e8954bfaacb6d90e407b6de4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3VvdGFpbA_size_16_color_FFFFFF_t_70 4]: /images/20220328/3ce57f9f068b4bacb36a88d40643f033.png