Spring RestTemplate 发送GET和POST请求 适用于80%的场景

Spring RestTemplate 使用：

发送GET请求：

示例1：发送最简单的GET请求

public String sendGetRequest() {

    ResponseEntity<String> responseEntity = restTemplate

            .exchange("https://www.test.com/testAPI", HttpMethod.GET, null, String.class);

    return responseEntity.getBody();

}

 

示例2：发送带头部信息的GET请求：

public String sendGetRequest() {

    DEBUG.debug("======Send Request [Start]========");
    String url = "https://www.test.com/testAPI";
    HttpHeaders headers = new HttpHeaders();
    headers.set("OtherHeadersxxx", "xxxx"); //Other headers
    HttpEntity<MultiValueMap<String, String>> httpEntity = new HttpEntity(headers);

    DEBUG.debug("Request URL: " + url);
    DEBUG.debug("Request Method: " + HttpMethod.GET);
    DEBUG.debug("Request Headers: " + httpEntity.getHeaders().toString());

    ResponseEntity<String> responseEntity = restTemplate
            .exchange(url, HttpMethod.GET, httpEntity, String.class);
    String responseBody = responseEntity.getBody();
    DEBUG.debug("Response Body: " + responseBody);
    DEBUG.debug("======Send Request[End]======");
    return responseBody;

}

 

 

发送POST请求：

可以设置一些头信息，比如Content-Type, Authentication….等等

示例1：直接填写request body的，比较适用于JSON或者XML格式的请求体

public String sendPostRequest() {
    DEBUG.debug("======Send Request [Start]========");
    String requestBody = "{"id": "test111"}";
    String url = "https://www.test.com/testAPI";
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);//Content-Type
    headers.set("OtherHeadersxxx", "xxxx"); //Other headers
    HttpEntity<String> httpEntity = new HttpEntity<>(requestBody, headers);

    DEBUG.debug("Request URL: " + url);
    DEBUG.debug("Request Method: " + HttpMethod.POST);
    DEBUG.debug("Request Headers: " + httpEntity.getHeaders().toString());
    DEBUG.debug("Request Body: " + httpEntity.getBody());

    ResponseEntity<String> responseEntity = restTemplate
            .exchange(url, HttpMethod.POST, httpEntity, String.class);
    String responseBody = responseEntity.getBody();
    DEBUG.debug("Response Body: " + responseBody);
    DEBUG.debug("=======Send Request[End]=========");
    return responseBody;
}

示例2：表单式的POST请求，一个个加参数

public String sendPostRequest() {
    DEBUG.debug("======Send Request [Start]========");
    String url = "https://www.test.com/testAPI";
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);//Content-Type
    headers.set("OtherHeadersxxx", "xxxx"); //Other headers
    MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
    params.add("param1", "testxxx");
    params.add("param2","testxxx");
    params.add("param3", "testxxx");
    HttpEntity<MultiValueMap<String, String>> httpEntity = new HttpEntity(params, headers);

    DEBUG.debug("Request URL: " + url);
    DEBUG.debug("Request Method: " + HttpMethod.POST);
    DEBUG.debug("Request Headers: " + httpEntity.getHeaders().toString());
    DEBUG.debug("Request Body: " + httpEntity.getBody());

    ResponseEntity<String> responseEntity = restTemplate
            .exchange(url, HttpMethod.POST, httpEntity, String.class);
    String responseBody = responseEntity.getBody();
    DEBUG.debug("Response Body: " + responseBody);
    DEBUG.debug("======Send Request[End]======");
    return responseBody;
}