JavaWeb应用开发实验报告-实验五 Servlet的常用功能

实验五Servlet的常用功能一、实验目的1、掌握Servlet的作用域和存取数据。2、掌握Servlet实现请求转发和重定向。二、实验环境PC系列微机：CPU2G以上，内存2G以上，硬盘可以空间：5G以上。操作系统：Windows10。三、实验步骤具体内容参考教材《JavaWeb应用开发基础教程》第3章。1、在Eclipse中创建JavaWeb项目；在JavaWeb项目中创建RequestScopeServlet并使用注解配置RequestScopeServlet；在RequestScopeServlet中，创建User对象，将User对象保存到Request作用域中；使用请求转发跳转到另一个ServletReceiveServlet，在ReceiveServlet中获取RequestScopeServlet中保存到Request作用域的User对象；部署JavaWeb项目到Tomcat，测试访问RequestScopeServlet。2、修改1中的RequestScopeServlet，使用Servlet重定向跳转到另一个ServletReceiveServlet，在ReceiveServlet中尝试获取RequestScopeServlet中保存到Request作用域的User对象；部署JavaWeb项目到Tomcat，测试访问RequestScopeServlet。3、编写SessionScopeServlet实现将创建的User对象保存到Session作用域、跳转到SessionReceiveServlet中并在SessionReceiveServlet中获取保存的User对象。4、编写ApplicationScopeServlet实现将创建的User对象保存到Application作用域、跳转到ApplicationReceiveServlet中并在ApplicationReceiveServlet中获取保存的User对象。四、实验报告1、请写出实验步骤1的RequestScopeServlet和ReceiveServlet的完整代码。①RequestScopeServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;@WebServlet(name="RequestScopeServlet",urlPatterns={"/RequestScope"})publicclassRequestScopeServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ Useruser=newUser(); user.setName("Mike"); user.setPassword("123"); user.setAge(22); request.setAttribute("user",user); //请求转发 request.getRequestDispatcher("Receive").forward(request,response); }②ReceiveServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;@WebServlet(name="ReceiveServlet",urlPatterns={"/Receive"})//ReceiveServlet此处要和上一页转发里面填写的地址一样，不然会出错的，找了好久的错误publicclassReceiveServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ //设置请求接收信息的编码格式 request.setCharacterEncoding("UTF-8"); //接收传过来的对象 Useru=(User)request.getAttribute("user"); //在控制台打印输出接收到的信息 System.out.println("name="+u.getName()+";password="+u.getPassword()+";age="+u.getAge()); }}请写出实验步骤2的RequestScopeServlet和ReceiveServlet的完整代码。①RequestScopeServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;@WebServlet(name="RequestScopeServlet",urlPatterns={"/RequestScope"})publicclassRequestScopeServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ Useruser=newUser(); user.setName("Mike"); user.setPassword("123"); user.setAge(22); request.setAttribute("user",user); //请求转发 request.getRequestDispatcher("Receive").forward(request,response);//ReceiveServlet //重定向 response.sendRedirect("Receive"); }}②ReceiveServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;@WebServlet(name="ReceiveServlet",urlPatterns={"/Receive"})publicclassReceiveServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ //设置请求接收信息的编码格式 request.setCharacterEncoding("UTF-8"); Useru=(User)request.getAttribute("user"); //在控制台打印输出接收到的信息 System.out.println("name="+u.getName()+";password="+u.getPassword()+";age="+u.getAge()); }}请说明实验步骤1的运行结果和实验步骤2的运行结果，并说明实验步骤1与2的运行结果差异的原因。步骤一结果是控制台输出打印结果；步骤二空。原因：重定向会丢失原来的请求信息。请写出SessionScopeServlet和SessionReceiveServlet的完整代码。①SessionScopeServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjavax.servlet.http.HttpSession;@WebServlet("/SessionScopeServlet")publicclassSessionScopeServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ Useruser=newUser(); user.setName("Mike"); user.setPassword("123"); user.setAge(22); HttpSessionsession=request.getSession(); session.setAttribute("user",user); //转发 request.getRequestDispatcher("SessionReceiveServlet").forward(request,response); }}②SessionReceiveServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjavax.servlet.http.HttpSession;@WebServlet("/SessionReceiveServlet")publicclassSessionReceiveServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ //设置请求接收信息的编码格式 request.setCharacterEncoding("UTF-8"); //接收传过来的信息 HttpSessionsession=request.getSession(); Useru=(User)session.getAttribute("user"); //在控制台打印输出接收到的信息 System.out.println("name="+u.getName()+";password="+u.getPassword()+";age="+u.getAge()); }}请写出ApplicationScopeServlet和ApplicationReceiveServlet的完整代码。①ApplicationScopeServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletContext;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;@WebServlet("/ApplicationScopeServlet")publicclassApplicationScopeServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ Useruser=newUser(); user.setName("Mike"); user.setPassword("123"); user.setAge(22); ServletContextapplication=this.getServletContext(); application.setAttribute("user",user); //转发 request.getRequestDispatcher("ApplicationReceiveServlet").forward(request,response); }}②ApplicationReceiveServlet的完整代码：packageexp5;importjava.io.IOException;importjavax.servlet.ServletContext;import