# 微服务模块之间接口调用方式（RestTemplate ）

微服务模块之间接口调用方式（RestTemplate ）

• RestTemplate 是org.springframework.web.client包下面的类，可以实现Post、Get等请求

配置类，配置RestTemplate Bean

@Configuration
public class RestTemplateConfig {
    /*** 使用LoadBlanced 可以用Eruake 中注册的服务名调用**/@Bean@LoadBalancedpublic RestTemplate restTemplate(ClientHttpRequestFactory factory) {
    return new RestTemplate(factory);}@Beanpublic ClientHttpRequestFactory simpleClientHttpRequestFactory() {
    SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();factory.setReadTimeout(5000);//单位为msfactory.setConnectTimeout(5000);//单位为msreturn factory;}}

注入RestTemplate 使用RestTemplate 调用接口

• Url格式：http://Eruake注册的服务名/接口地址

@RequestMapping("/test2")
public void test2(){
    try {
    // 调用的接口地址String url = "http://oscoreserver/test/test1";// 传的参数Map<String, Object> parameters = new HashMap<>(4);parameters.put("grant_type", "client_credential");// 接口返回的内容Object object = restTemplate.postForObject(url, parameters, String.class);System.out.println(object);}catch (Exception e){
    logger.info(e.getMessage());e.printStackTrace();}
}

RestTemplate Post请求

• 使用postForObject请求接口

String url = "http://oscoreserver/test/test1";
Map<String, Object> parameters = new HashMap<>(4);
parameters.put("tagid", "6666");
Object object = restTemplate.postForObject(url, parameters, String.class);

• postForObject()

public <T> T postForObject(String url, @Nullable Object request, Class<T> responseType, Object... uriVariables) throws RestClientException {
    }
public <T> T postForObject(String url, @Nullable Object request, Class<T> responseType, Map<String, ?> uriVariables)  throws RestClientException {
    }
public <T> T postForObject(URI url, @Nullable Object request, Class<T> responseType) throws RestClientException {
    }

• postForEntity()

<T> ResponseEntity<T> postForEntity(String var1, @Nullable Object var2, Class<T> var3, Object... var4) throws RestClientException;
<T> ResponseEntity<T> postForEntity(String var1, @Nullable Object var2, Class<T> var3, Map<String, ?> var4) throws RestClientException;
<T> ResponseEntity<T> postForEntity(URI var1, @Nullable Object var2, Class<T> var3) throws RestClientException;

RestTemplate Get请求

• 使用getForObject请求接口

Map<String, Object> parameters = new HashMap<>(4);
parameters.put("tagid", "6666");
String result1 = restTemplate.getForObject(url, String.class, paramMap);
System.out.println("result1====================" + result1);

• getForObject()

public <T> T getForObject(String url, Class<T> responseType, Object... uriVariables){
    }
public <T> T getForObject(String url, Class<T> responseType, Map<String, ?> uriVariables)
public <T> T getForObject(URI url, Class<T> responseType)

• getForEntity()

public <T> ResponseEntity<T> getForEntity(String url, Class<T> responseType, Object... uriVariables){
    }
public <T> ResponseEntity<T> getForEntity(String url, Class<T> responseType, Map<String, ?> uriVariables){
    }
public <T> ResponseEntity<T> getForEntity(URI url, Class<T> responseType){
    }