RestTemplate的HTTP传输

Post请求

Post的postForObject和postForEntity区别

• postForObject()返回值是HTTP协议的响应体。
• postForEntity()返回的是ResponseEntity，ResponseEntity是对HTTP响应的封装，除了包含响应体，还包含HTTP状态码、contentType、contentLength、Header等信息。

代码one

 RestTemplate restTemplate = new RestTemplate();
        // 请求头设置,x-www-form-urlencoded格式的数据
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
        map.add("access_key", v.getAccess_key());
        map.add("format", v.getFormat());
        map.add("sign", v.getSign());
        map.add("timestamp", v.getTimestamp());
        map.add("biz_content", v.getBiz_content());
        log.info("标准接口地址传出" + map);
        OutResponse result = restTemplate.postForObject(url, map, OutResponse.class);
        log.info("标准接口地址传入" + result);

代码two

 RestTemplate restTemplate = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity<Object> requestEntity = new HttpEntity<>(refundRequest, headers);
        log.info("标准接口退款传出参数" + refundRequest);
        ResponseEntity<RefundResponse> responsee = restTemplate.exchange(refundUrl, HttpMethod.POST, requestEntity, RefundResponse.class);
        log.info("标准接口退款传入参数" + responsee.getBody());
        HashMap<String,String> hashMap=new HashMap<>();

注意

headers.setContentType()方法一个是以请求体方式提交，一个是以表单方式提交；同时以表单提交一定要使用LinkedMultiValueMap的map实现类，不能使用实体类。

Get请求

代码

• Restful风格

String url = "http://jsonplaceholder.typicode.com/{1}/{2}";
PostDTO postDTO = restTemplate.getForObject(url, PostDTO.class, "1", "2");

• 普通风格

Map<String, String> params = new HashMap<>();
params.put("name", "dada");
restTemplate.getForEntity("http://HELLO-SERVICE/hello1?name={name}", String.class, params);