RestTemplate如何发送json请求呢?

RestTemplate简介

RestTemplate是从Spring3.0开始支持的一个HTTP请求工具
   RestTemplate提供常见REST请求方案的模版
   
如:
  GET请求
  POST请求
  PUT请求
  DELETE请求及一些通用的请求执行方法exchange及execute

RestTemplate继承自InterceptingHttpAccessor
   且实现RestOperations接口
   其中RestOperations接口定义基本RESTful操作
   这些操作在 RestTemplate 中都得到了实现。

RestTemplate简单示例

@RestController
public class TestController
{
    @RequestMapping(value = "testPost", method = RequestMethod.POST)
    public ResponseBean testPost(@RequestBody RequestBean requestBean)
    {
        ResponseBean responseBean = new ResponseBean();
        responseBean.setRetCode("0000");
        responseBean.setRetMsg("succ");
 
        return responseBean;
    }
}

//使用RestTemplate访问该服务
//restTemplate访问restful接口(url, requestBean, ResponseBean.class)
//这三个参数分别代表 请求地址、请求参数、HTTP响应转换被转换成的对象类型
//请求地址
String url = "http://localhost:8080/testPost";
//入参
RequestBean requestBean = new RequestBean();
requestBean.setTest1("1");
requestBean.setTest2("2");
requestBean.setTest3("3");

RestTemplate restTemplate = new RestTemplate();
ResponseBean responseBean = restTemplate.postForObject(url, requestBean, ResponseBean.class);

RestTemplate发送json请求的示例

 
JSONObject json = new JSONObject();
	json.put("train_date", train_date);
	json.put("from_station", fromStationCode);
	json.put("to_station", toStationCode);
	json.put("logFlag", logFlag);

	HttpHeaders headers = new HttpHeaders();
	MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
	headers.setContentType(type);
	headers.add("Accept", MediaType.APPLICATION_JSON.toString());
	HttpEntity<String> formEntity = new HttpEntity<String>(json.toString(), headers);
	String s= restTemplate.postForEntity(url,formEntity,String.class).getBody();