RestTemplate发送get和post请求,下载文件的实例

时间：2021-05-08 09:08:22|栏目：JAVA代码|点击：次

下图是我的所有测试接口，包含两个表单提交接口和一个Rest接口：

我是用的Http请求工具是Spring自带的RestTemplate。

请求的方法如下：

三个请求分别对应三个接口，在此记录下。

下载文件，获取文件字节流：

RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
ResponseEntity<byte[]> entity = restTemplate.exchange("http://ip:port/test.doc", HttpMethod.GET,new HttpEntity<>(headers), byte[].class);
byte[] body = entity.getBody();

multipart/form-data 文件上传：

RestTemplate restTemplate = new RestTemplate();
String url = "http://127.0.0.1:8080/file/upload"
MultiValueMap<String, Object> multiValueMap = new LinkedMultiValueMap<>();
// 设置multi/form-data文件
multiValueMap.add("file", new FileSystemResource("D:/1.mp3"));
multiValueMap.add("name", "测试材料");

// http请求
String response = restTemplate.postForObject(url, multiValueMap, String.class);

补充知识：restTemplate发送get与post请求并且带参数

我就废话不多说了，大家还是直接看代码吧~

@Test
 public void test() throws Exception{
 String url = "http://localhost:8081/aa";
 //headers
 HttpHeaders requestHeaders = new HttpHeaders();
 requestHeaders.add("api-version", "1.0");
 //body
 MultiValueMap<String, String> requestBody = new LinkedMultiValueMap<>();
 requestBody.add("id", "1");
 //HttpEntity
 HttpEntity<MultiValueMap> requestEntity = new HttpEntity<MultiValueMap>(requestBody, requestHeaders);
 //post
 ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, requestEntity, String.class);
 System.out.println(responseEntity.getBody());
 
 ResponseEntity<String> responseEntity1 = restTemplate.exchange("http://172.26.186.206:8080/hive/list/schemas?appid=admin_test",
  HttpMethod.GET, requestEntity, String.class);
 System.out.println(responseEntity1.getBody());
 }

restTemplate的注解如下：

@Component
public class MyConfig { 
 
  @Autowired
  RestTemplateBuilder builder;
 
  @Bean
  public RestTemplate restTemplate() {
    return builder.build();
  }
}

发送get请求

 @Test
 public void testCheck() {
 String url = "http://172.26.186.206:8080/syncsql/process";
 String timeStramp = String.valueOf(System.currentTimeMillis());
 HttpHeaders headers = new HttpHeaders();
 headers.add("appid", "");
 headers.add("sign", sign(null, null,null));
 headers.add("timestamp", timeStramp);
 
 JSONObject jsonObj = new JSONObject();
 
 HttpEntity<String> formEntity = new HttpEntity<String>(null, headers);
 
 Map<String, Object> maps = new HashMap<String, Object>();
 maps.put("sql", "select * from jingfen.d_user_city");
 maps.put("type", 1);
 maps.put("account", "admin_test");
 
 ResponseEntity<String> exchange = restTemplate.exchange(url + "?sql={sql}&type={type}&account={account}",
  HttpMethod.GET,
  formEntity, String.class, maps);
 String body = exchange.getBody();
 
 LOGGER.info("{}", body);
 }

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