RestTemplate实战

系统管理员 2021-07-24 21:20 502阅读 0赞

**一 代码位置**

[https://gitee.com/cakin24/code/tree/master/09/RestTemplateDemo][https_gitee.com_cakin24_code_tree_master_09_RestTemplateDemo]

**二 测试Get请求**

1 测试代码

2 控制台打印

1
    zhonghua
    {"id":2,"name":"hua"}
    {"id":3,"name":"zhonghuaLong"}
    {"id":1,"name":"zhonghua"}
    zhonghua

**三 测试POST，PUT和DELETE**

1 测试代码

package com.example.demo.controller;
    
    import com.example.demo.entity.User;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.boot.web.client.RestTemplateBuilder;
    import org.springframework.http.HttpEntity;
    import org.springframework.http.HttpHeaders;
    import org.springframework.http.HttpMethod;
    import org.springframework.http.ResponseEntity;
    import org.springframework.test.context.junit4.SpringRunner;
    import org.springframework.util.LinkedMultiValueMap;
    import org.springframework.util.MultiValueMap;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.client.RestTemplate;
    import java.net.URI;
    import static org.junit.Assert.*;
    
    @SpringBootTest
    @RunWith(SpringRunner.class)
    public class PostTest {
        @Autowired
        RestTemplateBuilder restTemplateBuilder;
        RestTemplate restTemplate = new RestTemplate();
    
        @Test
        public void postForEntity() {
            //RestTemplate client= restTemplateBuilder.build();
    // 封装参数，千万不要替换为Map与HashMap，否则参数无法传递
            MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
            paramMap.add("name", "longzhiran");
            paramMap.add("id", 4);
         /*   User user = new User();
            user.setName("hongwei");
            user.setId(4);*/
            //方法的第一参数表示要调用的服务的地址
            //方法的第二个参数表示上传的参数
            //方法的第三个参数表示返回的消息体的数据类型
            ResponseEntity<User> responseEntity = restTemplate.postForEntity("http://localhost:8080/postuser", paramMap, User.class);
            System.out.println(responseEntity.getBody().getName());
        }
    
        @Test
        public void postForObject() {
            // 封装参数，千万不要替换为Map与HashMap，否则参数无法传递
            MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
            paramMap.add("name", "longzhonghua");
            paramMap.add("id", 4);
            RestTemplate client = restTemplateBuilder.build();
            String response = client.postForObject("http://localhost:8080/postuser", paramMap, String.class);
            System.out.println(response);
        }
    
        @Test
        public void postForLocation() {
            // 封装参数，千万不要替换为Map与HashMap，否则参数无法传递
            MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
            paramMap.add("name", "longzhonghua");
            paramMap.add("id", 4);
    
    
            RestTemplate client = restTemplateBuilder.build();
            URI response = client.postForLocation("http://localhost:8080/post", paramMap);
            System.out.println(response);
        }
    
        @Test
        public void postForexchange() {
            // 封装参数，千万不要替换为Map与HashMap，否则参数无法传递
            MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
            paramMap.add("name", "longzhonghua");
            paramMap.add("id", 4);
            RestTemplate client = restTemplateBuilder.build();
            HttpHeaders headers = new HttpHeaders();
            //headers.set("id", "long");
            HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(paramMap, headers);
            ResponseEntity<String> response = client.exchange("http://localhost:8080/postuser", HttpMethod.POST, httpEntity, String.class, paramMap);
            System.out.println(response.getBody());
        }
        @Test
        public void put() {
            RestTemplate client = restTemplateBuilder.build();
            User user = new User();
            user.setName("longzhiran");
            client.put("http://localhost:8080/{1}", user, 4);
        }
    
        @Test
        public void delete() {
            RestTemplate client = restTemplateBuilder.build();
            client.delete("http://localhost:8080/{1}", 4);
        }
    }

2 测试结果

longzhiran
    {"id":4,"name":"longzhonghua"}
    null
    {"id":4,"name":"longzhonghua"}
    最后两个用例因为没有变形相应的控制器，会测试失败

[https_gitee.com_cakin24_code_tree_master_09_RestTemplateDemo]: https://gitee.com/cakin24/code/tree/master/09/RestTemplateDemo