servlet基本框架.doc

servlet基本框架:package com.servlet;import java.io.*;import .*;import javax.servlet.*;import javax.servlet.http.*public class First extends HttpServlet protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException response.setContentType(text/html;charset=UTF-8); PrintWriter out = response.getWriter(); out.println(); out.println(); out.println(Servlet First); out.println(); out.println(); out.println(Hello World); out.println(); out.println(); out.close(); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException processRequest(request, response); protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException processRequest(request, response); public String getServletInfo() return Short description;Web.xml First com.servlet.First First /First 30 index.jsp HTML Form 提交表单数据 欢迎登录系统 用户名: 密 码: package com.servlet;import java.io.*;import .*;import javax.servlet.*;import javax.servlet.http.*;public class GetPostData extends HttpServlet protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException response.setContentType(text/html;charset=gb2312); request.setCharacterEncoding(gb2312); PrintWriter out = response.getWriter(); out.println( n + + get post data + n + n + username: + request.getParameter(username) + n + password: + request.getParameter(password) + n + n + ); out.close(); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException processRequest(request, response); protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException processRequest(request, response); public String getServletInfo() return Short description; 解决中文乱码：response.setContentType(“text/html;charset=GB2312”)request.setCharacterEncoding(“gb2312”);main.Javapublic class Main extends HttpServlet protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException System.out.println(我在Servlet Main中); try Thread.sleep(2000); catch (InterruptedException ie) System.out.println(ie.toString(); String userID=request.getParameter(userID); if(userID=null)userID=; String password=request.getParameter(password); if(password=null)password=; if(userID.equals(guest)&password.equals(guest) RequestDispatcher dispatcher = request.getRequestDispatcher(LoginSuccess); dispatcher.forward(request, response); else RequestDispatcher dispatcher = request.getRequestDispatcher(LoginFail); dispatcher.forward(request, response); 你好, % Name=request.getParameter(UserName); String stars=new String(你喜欢的歌星有：); String paramValues = request.getParameterValues(checkbox1);for(int i=0;i session 姓名 Logcheck.jsp %String promt=new String(); String Name=request.getParameter(UserName); boolean hasLog=false; ArrayList names= (ArrayList)session.getAttribute(lognames); if(names=null) names=new ArrayList(); names.add(Name); session.setAttribute(lognames,names); promt= 欢迎登录 ！你的名字已经写入session ; else for(int i=0;i application网页计数器网页计数器您是第位访问者！Forward跳转forward当前推荐图书清单:0.5)%Javabean向jsp:forward传递参数示例：向jsp:forward传递参数示例： 1.数据库访问过程 P220（要求会写）Java.sql.Connection conn = null;Java.langString strConn;Java.sql.statement stmt = null;Java.sql.ResultSet rs = null;TryClass.forName(“org.git.mm.mysql.Driver”);conn = java.sql.DriverManager.getConnection(“jdbc:mysql:/localhost:3306/test”,”root”,”1”)stmt = conn.createStatement();String sql = “select * from user”rs = stmt.execute