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本文介绍restTemplate基础用法。
Java中get和post的用法请参考: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 provideGet(){ return myService.provideGet(); } // 提供post接口 @PostMapping("/providePost") public Map 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 providePostByMap(@RequestParam Map map) { return myService.providePostByMap(map); } // 调用get接口 @GetMapping("/useGet") public Map useGet() { return myService.useGet(); }}
1.2 Service
@Service@EnableSchedulingpublic class MyService { public Map provideGet() { Map res = new HashMap<>(); res.put("number", "3"); res.put("name", "张三get"); System.out.println("provideGet res:" + res + "\n"); return res; } public Map providePost(int number, String name) { Map res = new HashMap<>(); res.put("number", number); res.put("name", name); return res; } public Map providePostByMap(Map 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 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 useGet() { return myService.useGet(); } // 调用get接口验证账号密码 @GetMapping("/useGetByPsw") public Map useGetByPsw() { return myService.useGetByPsw(); } // 调用post接口 @PostMapping("/usePost") public Map usePost() { return myService.usePost(); }}
2.2 Service
@Service@EnableSchedulingpublic class MyService { @Resource private RestTemplate restTemplate; String getURL = "http://localhost:8081/homepage/provideGet"; String postURL = "http://localhost:8081/homepage/providePostByMap"; public Map useGet() { // getForObject返回值是HTTP协议的响应体 String strObject1 = restTemplate.getForObject(getURL, String.class); //无参 JSONObject jsonObject1 = JSONObject.parseObject(strObject1); MultiValueMap sendData = new LinkedMultiValueMap<>(); sendData.add("number", "3"); sendData.add("name", "张三post"); String strObject2 = restTemplate.getForObject(getURL, String.class, sendData); // 带参 JSONObject jsonObject2 = JSONObject.parseObject(strObject2); // getForEntity返回的是ResponseEntity,是对HTTP响应的封装 ResponseEntity responseData = restTemplate.getForEntity(getURL, ResponseResult.class); Map returnData = new HashMap<>(); returnData.put("StatusCode:", responseData.getStatusCode()); returnData.put("Body:", responseData.getBody()); System.out.println("useGet jsonObject1:" + jsonObject1 + "\n"); System.out.println("useGet jsonObject2:" + jsonObject2 + "\n"); System.out.println("useGet responseData:" + responseData + "\n"); System.out.println("useGet returnData:" + returnData + "\n"); return returnData; } public Map 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 responseData = restTemplate.getForEntity(getURL, ResponseResult.class); Map 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 usePost() { //RestTemplate在postForObject时,用MultiValueMap,不可使用HashMap。 MultiValueMap 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 responseData = restTemplate.postForEntity(postURL, sendData, ResponseResult.class); Map 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; }}
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