REST，HTTP POST demo

最新推荐文章于 2020-02-25 18:05:13 发布

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本文介绍了一个HTTP POST请求的客户端与服务器端实现案例，客户端使用Java发送JSON格式的数据到指定URL，服务器端接收并处理该JSON数据，根据业务逻辑返回相应状态码及消息。

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客户端程序（其中，content为要传输的json数据）：

                HttpPost httppost = new HttpPost(
				"http://xxxhost/api/my_path?mc=1");
		HttpClient httpclient = HttpClientBuilder.create().build();
		try {
			StringEntity reqEntity = new StringEntity(<strong><span style="color:#ff0000;">content</span></strong>);
			reqEntity.setContentType("application/json");
			httppost.setEntity(reqEntity);
			HttpResponse httpresponse = httpclient.execute(httppost);
			HttpEntity entity = httpresponse.getEntity();
			String body = EntityUtils.toString(entity);
			
			System.out.println(body);

服务器端程序：

@Path("/<span style="font-family: Arial, Helvetica, sans-serif;">my_path</span>")

public class Events {
@POST
@Consumes(MediaType.APPLICATION_JSON)
	public Response addEvent(<strong><span style="color:#ff0000;">@QueryParam</span></strong>(ConfigItemConstants.CONFIG_ITEM_MC) String mc, Object eventStr){
		if(!GenericValidator.isNullOrBlank(mc) && !ConfigItemUtil.verifyMC(mc)){//在这里，验证你传过来的mc参数，通过则继续
			return ResponseUtil.setErrorResponse(403, "Forbidden", "User does not have access to this service!");
		}
		EventService eventService = new EventService();
		int code = 200;
		String resBody = "";
		int rtn = 0;
		try {
			Long id = eventService.createEvent(eventStr);//传过来的json数据都在eventStr中，你可以根据需求自己处理，比如存储到NoSQL中。
			rtn = 1;
		} catch (Exception e) {
			rtn = -1;
			e.printStackTrace();
		} 
		
		if(rtn == 1){
			code = 201;
			resBody = "The event created successfully";
		}else if(rtn == -1){
			code = 400;
			resBody = "Format of request is not correct";
		}
		
//		logger.exit();
		if(rtn == 1){
			return ResponseUtil.setResponse(code, resBody);
		} else {
			return ResponseUtil.setErrorResponse(code, "Bad Request", resBody);
		}
	}
	
	@Path("{delete}")
	@DELETE
	@Consumes(MediaType.APPLICATION_JSON)
	public Response deleteEvent(@QueryParam(ConfigItemConstants.CONFIG_ITEM_MC) String mc, String vehicleId){
		if(!GenericValidator.isNullOrBlank(mc) && !ConfigItemUtil.verifyMC(mc)){
			return ResponseUtil.setErrorResponse(403, "Forbidden", "User does not have access to this service!");
		}
		
		EventService eventService = new EventService();
		int code = 200;
		String resBody = "";
		int rtn = 0;
		try{
			Long id = eventService.deleteEvent(vehicleId);
			rtn = 1;
		}catch(Exception e){
			rtn = -1;
			e.printStackTrace();
		}
		if(rtn == 1){
			code = 201;
			resBody = "The event created successfully";
		}else if(rtn == -1){
			code = 400;
			resBody = "Format of request is not correct";
		}
		
		if(rtn == 1){
			return ResponseUtil.setResponse(code, resBody);
		} else {
			return ResponseUtil.setErrorResponse(code, "Bad Request", resBody);
		}
	}
	
	}

Note：客户端程序和服务器端程序只是相对来说的，这是受传统开发web project的思维影响！新的技术都可能颠覆这种思维！做技术，思维一定要跟上！尤其是出现了REST，DevOps，cloud service，Nodejs，distribution app。

准确来说一个是http post request端，一个是http post response端。实际上，这两个都是服务器容器App。