详解Java中restTemplate的使用
作者:代码的路 时间:2023-06-19 23:20:29
本文介绍restTemplate基础用法。
Java中get和post的用法请参考:一文带你搞懂Java中Get和Post的使用
1 提供get/post接口
1.1 Controller
@RestController
@RequestMapping("/homepage")
public class MyController {
@Autowired
MyService myService;
// 提供get接口
@GetMapping("/provideGet")
public Map<String, String> provideGet(){
return myService.provideGet();
}
// 提供post接口
@PostMapping("/providePost")
public Map<String, Object> providePost(@RequestParam("number") int number, @RequestParam("name") String name) {
return myService.providePost(number, name);
}
// 提供map参数的post接口
@PostMapping("/providePostByMap")
public Map<String, Object> providePostByMap(@RequestParam Map<String, Object> map) {
return myService.providePostByMap(map);
}
// 调用get接口
@GetMapping("/useGet")
public Map<String, Object> useGet() {
return myService.useGet();
}
}
1.2 Service
@Service
@EnableScheduling
public class MyService {
public Map<String, String> provideGet() {
Map<String, String> res = new HashMap<>();
res.put("number", "3");
res.put("name", "张三get");
System.out.println("provideGet res:" + res + "\n");
return res;
}
public Map<String, Object> providePost(int number, String name) {
Map<String, Object> res = new HashMap<>();
res.put("number", number);
res.put("name", name);
return res;
}
public Map<String, Object> providePostByMap(Map<String, Object> map) {
int number = map.get("number") == null ? 0 : Integer.parseInt((String) map.get("number"));
String name = map.get("name") == null ? "" : (String) map.get("name");
Map<String, Object> res = new HashMap<>();
res.put("number", number);
res.put("name", name);
System.out.println("providePostByMap res:" + res + "\n");
return res;
}
}
2 调用get/post接口
使用restTemplate调用get/post接口。
getForObject()
:返回值是HTTP
协议的响应体getForEntity()
: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
2.1 Controller
@RestController
@RequestMapping("/homepage")
public class MyController {
@Autowired
MyService myService;
// 调用get接口
@GetMapping("/useGet")
public Map<String, Object> useGet() {
return myService.useGet();
}
// 调用get接口验证账号密码
@GetMapping("/useGetByPsw")
public Map<String, Object> useGetByPsw() {
return myService.useGetByPsw();
}
// 调用post接口
@PostMapping("/usePost")
public Map<String, Object> usePost() {
return myService.usePost();
}
}
2.2 Service
@Service
@EnableScheduling
public class MyService {
@Resource
private RestTemplate restTemplate;
String getURL = "http://localhost:8081/homepage/provideGet";
String postURL = "http://localhost:8081/homepage/providePostByMap";
public Map<String, Object> useGet() {
// getForObject返回值是HTTP协议的响应体
String strObject = restTemplate.getForObject(getURL, String.class);
JSONObject jsonObject = JSONObject.parseObject(strObject);
// getForEntity返回的是ResponseEntity,是对HTTP响应的封装
ResponseEntity<ResponseResult> responseData = restTemplate.getForEntity(getURL, ResponseResult.class);
Map<String, Object> returnData = new HashMap<>();
returnData.put("StatusCode:", responseData.getStatusCode());
returnData.put("Body:", responseData.getBody());
System.out.println("useGet jsonObject:" + jsonObject + "\n");
System.out.println("useGet responseData:" + responseData + "\n");
System.out.println("useGet returnData:" + returnData + "\n");
return returnData;
}
public Map<String, Object> useGetByPsw() {
RestTemplateBuilder builder = new RestTemplateBuilder();
RestTemplate restTemplate = builder.basicAuthentication("username", "password").build();
// getForEntity返回的是ResponseEntity,是对HTTP响应的封装
ResponseEntity<ResponseResult> responseData = restTemplate.getForEntity(getURL, ResponseResult.class);
Map<String, Object> returnData = new HashMap<>();
returnData.put("StatusCode:", responseData.getStatusCode());
returnData.put("Body:", responseData.getBody());
System.out.println("useGetByPsw returnData:" + responseData + "\n");
System.out.println("useGetByPsw returnData:" + returnData + "\n");
return returnData;
}
public Map<String, Object> usePost() {
//RestTemplate在postForObject时,用MultiValueMap,不可使用HashMap。
MultiValueMap<String, String> sendData = new LinkedMultiValueMap<>();
sendData.add("number", "3");
sendData.add("name", "张三post");
// getForObject返回值是HTTP协议的响应体
String strObject = restTemplate.postForObject(postURL, sendData, String.class);
JSONObject jsonObject = JSONObject.parseObject(strObject);
// getForEntity返回的是ResponseEntity,是对HTTP响应的封装
ResponseEntity<ResponseResult> responseData = restTemplate.postForEntity(postURL, sendData, ResponseResult.class);
Map<String, Object> returnData = new HashMap<>();
returnData.put("StatusCode:", responseData.getStatusCode());
returnData.put("Body:", responseData.getBody());
System.out.println("usePost jsonObject:" + jsonObject + "\n");
System.out.println("usePost responseData:" + responseData + "\n");
System.out.println("usePost returnData:" + returnData + "\n");
return returnData;
}
}
来源:https://mp.weixin.qq.com/s/0dEAl8yySdgSlbzeozQc8A
标签:Java,restTemplate
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