留言板源代码java

package com.neuq.liuyan.servlet; import java.io.IOException; import java.util.List; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.neuq.liuyan.bean.ContentBean; import com.neuq.liuyan.service.QueryService; import com.neuq.liuyan.service.SaveService; @SuppressWarnings("serial") public class LyServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to * post. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* 声明必要参数 */ boolean flag = false; String content = request.getParameter("content"); String username = request.getParameter("username"); ContentBean conbean = new ContentBean(); conbean.setContent(content); conbean.setUsername(username); RequestDispatcher rd = null; List<ContentBean> list = null; if (username != null) { SaveService save = new SaveService(); flag=save.save(conbean); }else{ flag=true; } QueryService query = new QueryService(); list = query.query(); if (list != null && flag) { request.setAttribute("list", list); rd = request.getRequestDispatcher("index.jsp"); rd.forward(request, response); } else { request.setAttribute("message", "留言失败！请输入用户名！"); rd = request.getRequestDispatcher("error/error.jsp"); rd.forward(request, response); } } public void init() throws ServletException { // Put your code here } }