提供了getForObject 、getForEntity两种方式，其中getForEntity如下三种方法的实现：
Get–getForEntity，存在以下两种方式重载
getForEntity(Stringurl,Class responseType,Object…urlVariables) getForEntity(URI url,Class responseType)
Get–getForEntity(URI url,Class responseType) //该方法使用URI对象来替代之前的url和urlVariables参数来指定访问地址和参数绑定。URI是JDK java.net包下的一个类，表示一个统一资源标识符(Uniform Resource Identifier)引用。参考如下：RestTemplate restTemplate=new RestTemplate();UriComponents uriComponents=UriComponentsBuilder.fromUriString("http://USER-SERVICE/user?name={name}").build().expand("dodo").encode();URI uri=uriComponents.toUri();ResponseEntityresponseEntity=restTemplate.getForEntity(uri,String.class).getBody(); Get–getForEntity(Stringurl,Class responseType,Object…urlVariables) //该方法提供了三个参数，其中url为请求的地址，responseType为请求响应body的包装类型，urlVariables为url中的参数绑定，该方法的参考调用如下：// http://USER-SERVICE/user?name={name)RestTemplate restTemplate=new RestTemplate();Mapparams=new HashMap<>();params.put("name","dada"); //ResponseEntityresponseEntity=restTemplate.getForEntity("http://USERSERVICE/user?name={name}",String.class,params); Get–getForObject，存在以下三种方式重载getForObject(String url,Class responseType,Object…urlVariables) getForObject(String url,Class responseType,Map urlVariables) getForObject(URI url,Class responseType)
getForObject方法可以理解为对getForEntity的进一步封装，它通过HttpMessageConverterExtractor对HTTP的请求响应体body内容进行对象转换，实现请求直接返回包装好的对象内容。
Post 请求Post请求提供有postForEntity、postForObject和postForLocation三种方式，其中每种方式都有三种方法，下面介绍postForEntity的使用方法。 Post–postForEntity，存在以下三种方式重载
postForEntity(String url,Object request,Class responseType,Object… uriVariables) postForEntity(String url,Object request,Class responseType,Map uriVariables) postForEntity(URI url,Object request，Class responseType)
如下仅演示第二种重载方式
/** @description post方式获取入参，插入数据并发起流程* @author lyx* @date 2022/8/24 16:07* @params* @return*/@PostMapping("/submit2")public Object insertFinanceCompensation(@RequestBody JSONObject jsonObject) {String documentId=jsonObject.get("documentId").toString();return task2Service.submit(documentId);}/** @description 使用restTimeplate调外部接口* @author lyx* @date 2022/8/24 16:02* @params documentId* @return String*/public String submit(String documentId){String assessToken="eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.eyJ4ZGFwYXBwaWQiOiIzNDgxMjU4ODk2OTI2OTY1NzYiLCJleHAiOjE2NjEyMjY5MDgsImlhdCI6MTY2MTIxOTcwOCwieGRhcHRlbmFudGlkIjoiMzAwOTgxNjA1MTE0MDUyNjA5IiwieGRhcHVzZXJpZCI6IjEwMDM0NzY2MzU4MzM1OTc5NTIwMCJ9.fZAO4kJSv2rSH0RBiL1zghdko8Npmu_9ufo6Wex_TI2q9gsiLp7XaW7U9Cu7uewEOaX4DTdpbFmMPvLUtcj_sQ";RestTemplate restTemplate = new RestTemplate();//创建请求头HttpHeaders httpHeaders = new HttpHeaders();//此处相当于在Authorization里头添加Bear token参数信息httpHeaders.add(HttpHeaders.AUTHORIZATION, "Bearer " + assessToken);//此处相当于在header里头添加content-type等参数httpHeaders.add(HttpHeaders.CONTENT_TYPE,"application/json");Map<String, Object> map = getMap(documentId);String jsonStr = JSON.toJSONString(map);//创建请求体并添加数据HttpEntity<Map> httpEntity = new HttpEntity<Map>(map, httpHeaders);String url = "http://39.103.201.110:30661/xdap-open/open/process/v1/submit";ResponseEntity<String> forEntity = restTemplate.postForEntity(url,httpEntity,String.class);//此处三个参数分别是请求地址、请求体以及返回参数类型return forEntity.toString();} 使用Feign进行消费在maven项目中添加依赖
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-feign</artifactId><version>1.2.2.RELEASE</version></dependency>启动类上加上@EnableFeignClients
@SpringBootApplication@EnableFeignClients@ComponentScan(basePackages = {"com.definesys.mpaas", "com.xdap.*" ,"com.xdap.*"})public class MobilecardApplication {public static void main(String[] args) {SpringApplication.run(MobilecardApplication.class, args);}}此处编写接口模拟外部接口供feign调用外部接口方式使用 定义controller
@AutowiredPrintService printService;@PostMapping("/outSide")public String test(@RequestBody TestDto testDto) {return printService.print(testDto);}定义service
@Servicepublic interface PrintService {public String print(TestDto testDto);}定义serviceImplpublic class PrintServiceImpl implements PrintService {@Overridepublic String print(TestDto testDto) {return "模拟外部系统的接口功能"+testDto.getId();}}构建Feigin的Service 定义service
//此处name需要设置不为空，url需要在.properties中设置@Service@FeignClient(url = "${outSide.url}", name = "service2")public interface FeignService2 {@RequestMapping(value = "/custom/outSide", method = RequestMethod.POST)@ResponseBodypublic String getMessage(@Valid @RequestBody TestDto testDto);}定义controller
@AutowiredFeignService2 feignService2;//测试feign调用外部接口入口@PostMapping("/test2")public String test2(@RequestBody TestDto testDto) {return feignService2.getMessage(testDto);}补充如下：
添加Header解决方法 将token等信息放入Feign请求头中，主要通过重写RequestInterceptor的apply方法实现
定义config
@Configurationpublic class FeignConfig implements RequestInterceptor {@Overridepublic void apply(RequestTemplate requestTemplate) {//添加tokenrequestTemplate.header("token", "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.eyJ4ZGFwYXBwaWQiOiIzNDgxMjU4ODk2OTI2OTY1NzYiLCJleHAiOjE2NjEyMjY5MDgsImlhdCI6MTY2MTIxOTcwOCwieGRhcHRlbmFudGlkIjoiMzAwOTgxNjA1MTE0MDUyNjA5IiwieGRhcHVzZXJpZCI6IjEwMDM0NzY2MzU4MzM1OTc5NTIwMCJ9.fZAO4kJSv2rSH0RBiL1zghdko8Npmu_9ufo6Wex_TI2q9gsiLp7XaW7U9Cu7uewEOaX4DTdpbFmMPvLUtcj_sQ");}}定义service
@Service@FeignClient(url = "${outSide.url}",name = "feignServer", configuration = FeignDemoConfig.class)public interface TokenDemoClient {@RequestMapping(value = "/custom/outSideAddToken", method = RequestMethod.POST)@ResponseBodypublic String getMessage(@Valid @RequestBody TestDto testDto);}定义controller
//测试feign调用外部接口入口，加上token@PostMapping("/testToken")public String test4(@RequestBody TestDto testDto) {return tokenDemoClient.getMessage(testDto);}参考 https://mp.weixin.qq.com/s/bEEd87QIxDyvftMy7pK3rg
