public static String doPostBody(String url,String body) throws Exception  	
			HttpPost http = new HttpPost(url);	
	        http.setEntity(new StringEntity(body,ContentType.APPLICATION_JSON)); 
	         
		    //http.setHeader("Content-Type", "text/html;charset=UTF-8");
		    http.setHeader("Connection", "keep-alive");

			CloseableHttpResponse response = httpClient.execute(http);
			StatusLine sl = response.getStatusLine();
		    
			HttpEntity entity = response.getEntity();
			return EntityUtils.toString(entity, CommConst.UTF8);
			
			
new StringEntity(body,ContentType.APPLICATION_JSON)
HttpEntity entity = response.getEntity();
EntityUtils.toString(entity, CommConst.UTF8);


springboot 服务端接口

	@RequestMapping("/echo")
	public UserDO echo(@RequestBody UserDO user) {	
		return user;
	}
	
mvn spring-boot:run -Dstart-class=demo.DemoApp 
默认端口 8090
指定端口  -Dspring-boot.run.arguments=--server.port=8080

HttpClientUtil  完整代码
https://gitee.com/dyyx/hellocode/blob/master/project/jpress/src/main/java/dyyx/util/HttpClientUtil.java

客户端测试代码 HttpClientUtilPostBodyTest
https://gitee.com/dyyx/hellocode/blob/master/project/jpress/src/test/java/dyyx/util/HttpClientUtilPostBodyTest.java

springboot 服务端工程代码
https://gitee.com/dyyx/springboothello


 Maven命令行直接运行SpringBoot项目