RestTemplate

设置请求头、请求体

1、POST、PUT请求设置请求头、请求体

    @PostMapping("post_with_body_and_header")
    public void postWithBodyAndHeader(@RequestBody(required = false) UserEntity requestBody) {
        // 1.请求头
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.add("headerName1", "headerValue1");
        httpHeaders.add("headerName2", "headerValue2");
        httpHeaders.add("headerName3", "headerValue3");
        httpHeaders.add("Content-Type", "application/json"); // 传递请求体时必须设置

        // 2.请求头 & 请求体
        HttpEntity<String> fromEntity = new HttpEntity<>(JSONUtil.toJsonStr(requestBody), httpHeaders);


        MessageBox responseBody = restTemplate.postForObject(INVOKE_URL + "/test/receive", fromEntity, MessageBox.class);
        log.info("响应体：{}", JSONUtil.toJsonPrettyStr(responseBody));
    }

2、其他请求设置请求头、请求体

HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.set("MyRequestHeader", "MyValue");
HttpEntity requestEntity = new HttpEntity(requestHeaders);

HttpEntity<String> response = template.exchange(
        "http://example.com/hotels/{hotel}",
        HttpMethod.GET, 
        requestEntity, 
        String.class, 
        "42"
    );

String responseHeader = response.getHeaders().getFirst("MyResponseHeader");
String body = response.getBody();