TransferServlet类代码示例

最新推荐文章于 2025-07-28 17:30:49 发布

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最新推荐文章于 2025-07-28 17:30:49 发布

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分类专栏： Java进阶代码示例文章标签： java java-ee spring

原文链接：https://kaiwu.lagou.com/

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该博客主要介绍了一个Servlet如何从BeanFactory获取ProxyFactory，进而通过代理工厂获取增强事务控制功能的TransferService实现转账操作。在doPost方法中，接收到请求参数后，调用transferService的transfer方法进行转账，并根据操作结果设置返回的状态码和错误信息，最后以JSON格式响应。

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package com.lagou.edu.servlet;

import com.lagou.edu.factory.BeanFactory;
import com.lagou.edu.factory.ProxyFactory;
import com.lagou.edu.service.impl.TransferServiceImpl;
import com.lagou.edu.utils.JsonUtils;
import com.lagou.edu.pojo.Result;
import com.lagou.edu.service.TransferService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author 应癫
 */
@WebServlet(name="transferServlet",urlPatterns = "/transferServlet")
public class TransferServlet extends HttpServlet {


    // 从工厂获取委托对象（委托对象是增强了事务控制的功能）

    // 首先从BeanFactory获取到proxyFactory代理工厂的实例化对象
    private ProxyFactory proxyFactory = (ProxyFactory) BeanFactory.getBean("proxyFactory");
    private TransferService transferService = (TransferService) proxyFactory.getJdkProxy(BeanFactory.getBean("transferService")) ;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        // 设置请求体的字符编码
        req.setCharacterEncoding("UTF-8");

        String fromCardNo = req.getParameter("fromCardNo");
        String toCardNo = req.getParameter("toCardNo");
        String moneyStr = req.getParameter("money");
        int money = Integer.parseInt(moneyStr);

        Result result = new Result();

        try {

            // 2. 调用service层方法
            transferService.transfer(fromCardNo,toCardNo,money);
            result.setStatus("200");
        } catch (Exception e) {
            e.printStackTrace();
            result.setStatus("201");
            result.setMessage(e.toString());
        }

        // 响应
        resp.setContentType("application/json;charset=utf-8");
        resp.getWriter().print(JsonUtils.object2Json(result));
    }
}