{  "Author": "tomcat and jerry",  "url":"http://www.cnblogs.com/tomcatandjerry/p/5899722.html"
} 

String url = "http://localhost:8080/json";
JSONObject json = restTemplate.getForEntity(url, JSONObject.class).getBody();  

package com.iwhere.scrapy.rest;import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.List;import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestOperations;
import org.springframework.web.client.RestTemplate;/*** 定义restTemplate的配置* * @author wenbronk* @Date 下午4:33:35*/
@Configuration
public class RestTemplateConfig {@Bean@ConditionalOnMissingBean({ RestOperations.class, RestTemplate.class })public RestTemplate restTemplate(ClientHttpRequestFactory factory) {// return new RestTemplate(factory);
RestTemplate restTemplate = new RestTemplate(factory);// 使用 utf-8 编码集的 conver 替换默认的 conver（默认的 string conver 的编码集为"ISO-8859-1"）List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();Iterator<HttpMessageConverter<?>> iterator = messageConverters.iterator();while (iterator.hasNext()) {HttpMessageConverter<?> converter = iterator.next();if (converter instanceof StringHttpMessageConverter) {iterator.remove();}}messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));return restTemplate;}@Bean@ConditionalOnMissingBean({ClientHttpRequestFactory.class})public ClientHttpRequestFactory simpleClientHttpRequestFactory() {SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();factory.setReadTimeout(15000);// msfactory.setConnectTimeout(15000);// msreturn factory;}
}

SpringRestTemplateApp.java
@RestController
@EnableAutoConfiguration
@Import(value = {Conf.class})
public class SpringRestTemplateApp {  @Autowired  RestTemplate restTemplate;  /***********HTTP GET method*************/  @RequestMapping("")  public String hello(){  String url = "http://localhost:8080/json";  JSONObject json = restTemplate.getForEntity(url, JSONObject.class).getBody();  return json.toJSONString();  }  @RequestMapping("/json")  public Object genJson(){  JSONObject json = new JSONObject();  json.put("descp", "this is spring rest template sample");  return json;  }  /**********HTTP POST method**************/  @RequestMapping("/postApi")  public Object iAmPostApi(@RequestBody JSONObject parm){  System.out.println(parm.toJSONString());  parm.put("result", "hello post");  return parm;  }  @RequestMapping("/post")  public Object testPost(){  String url = "http://localhost:8080/postApi";  JSONObject postData = new JSONObject();  postData.put("descp", "request for post");  JSONObject json = restTemplate.postForEntity(url, postData, JSONObject.class).getBody();  return json.toJSONString();  }  public static void main(String[] args) throws Exception {  SpringApplication.run(SpringRestTemplateApp.class, args);  }  }  

@RequestMapping("/async")  public String asyncReq(){  String url = "http://localhost:8080/jsonAsync";  ListenableFuture<ResponseEntity<JSONObject>> future = asyncRestTemplate.getForEntity(url, JSONObject.class);  future.addCallback(new SuccessCallback<ResponseEntity<JSONObject>>() {  public void onSuccess(ResponseEntity<JSONObject> result) {  System.out.println(result.getBody().toJSONString());  }  }, new FailureCallback() {  public void onFailure(Throwable ex) {  System.out.println("onFailure:"+ex);  }  });  return "this is async sample";  

@RequestMapping("/headerApi")//模拟远程的restful API  public JSONObject withHeader(@RequestBody JSONObject parm, HttpServletRequest req){  System.out.println("headerApi====="+parm.toJSONString());  Enumeration<String> headers = req.getHeaderNames();  JSONObject result = new JSONObject();  while(headers.hasMoreElements()){  String name = headers.nextElement();  System.out.println("["+name+"]="+req.getHeader(name));  result.put(name, req.getHeader(name));  }  result.put("descp", "this is from header");  return result;  }  @RequestMapping("/header")  public Object postWithHeader(){  //该方法通过restTemplate请求远程restfulAPI  HttpHeaders headers = new HttpHeaders();  headers.set("auth_token", "asdfgh");  headers.set("Other-Header", "othervalue");  headers.setContentType(MediaType.APPLICATION_JSON);  JSONObject parm = new JSONObject();  parm.put("parm", "1234");  HttpEntity<JSONObject> entity = new HttpEntity<JSONObject>(parm, headers);  HttpEntity<String> response = restTemplate.exchange(  "http://localhost:8080/headerApi", HttpMethod.POST, entity, String.class);//这里放JSONObject, String 都可以。因为JSONObject返回的时候其实也就是string  return response.getBody();  }