JavaWeb應用開發(fā)實驗報告-實驗五 Servlet的常用功能

實驗五Servlet的常用功能一、實驗目的1、掌握Servlet的作用域和存取數(shù)據(jù)。2、掌握Servlet實現(xiàn)請求轉發(fā)和重定向。二、實驗環(huán)境PC系列微機：CPU2G以上，內存2G以上，硬盤可以空間：5G以上。操作系統(tǒng)：Windows10。三、實驗步驟具體內容參考教材《JavaWeb應用開發(fā)基礎教程》第3章。1、在Eclipse中創(chuàng)建JavaWeb項目；在JavaWeb項目中創(chuàng)建RequestScopeServlet并使用注解配置RequestScopeServlet；在RequestScopeServlet中，創(chuàng)建User對象，將User對象保存到Request作用域中；使用請求轉發(fā)跳轉到另一個ServletReceiveServlet，在ReceiveServlet中獲取RequestScopeServlet中保存到Request作用域的User對象；部署JavaWeb項目到Tomcat，測試訪問RequestScopeServlet。2、修改1中的RequestScopeServlet，使用Servlet重定向跳轉到另一個ServletReceiveServlet，在ReceiveServlet中嘗試獲取RequestScopeServlet中保存到Request作用域的User對象；部署JavaWeb項目到Tomcat，測試訪問RequestScopeServlet。3、編寫SessionScopeServlet實現(xiàn)將創(chuàng)建的User對象保存到Session作用域、跳轉到SessionReceiveServlet中并在SessionReceiveServlet中獲取保存的User對象。4、編寫ApplicationScopeServlet實現(xiàn)將創(chuàng)建的User對象保存到Application作用域、跳轉到ApplicationReceiveServlet中并在ApplicationReceiveServlet中獲取保存的User對象。四、實驗報告1、請寫出實驗步驟1的RequestScopeServlet和ReceiveServlet的完整代碼。①RequestScopeServlet的完整代碼：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); //請求轉發(fā) request.getRequestDispatcher("Receive").forward(request,response); }②ReceiveServlet的完整代碼：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此處要和上一頁轉發(fā)里面填寫的地址一樣，不然會出錯的，找了好久的錯誤publicclassReceiveServletextendsHttpServlet{ publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ doPost(request,response); } publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ //設置請求接收信息的編碼格式 request.setCharacterEncoding("UTF-8"); //接收傳過來的對象 Useru=(User)request.getAttribute("user"); //在控制臺打印輸出接收到的信息 System.out.println("name="+u.getName()+";password="+u.getPassword()+";age="+u.getAge()); }}請寫出實驗步驟2的RequestScopeServlet和ReceiveServlet的完整代碼。①RequestScopeServlet的完整代碼：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); //請求轉發(fā) request.getRequestDispatcher("Receive").forward(request,response);//ReceiveServlet //重定向 response.sendRedirect("Receive"); }}②ReceiveServlet的完整代碼：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{ //設置請求接收信息的編碼格式 request.setCharacterEncoding("UTF-8"); Useru=(User)request.getAttribute("user"); //在控制臺打印輸出接收到的信息 System.out.println("name="+u.getName()+";password="+u.getPassword()+";age="+u.getAge()); }}請說明實驗步驟1的運行結果和實驗步驟2的運行結果，并說明實驗步驟1與2的運行結果差異的原因。步驟一結果是控制臺輸出打印結果；步驟二空。原因：重定向會丟失原來的請求信息。請寫出SessionScopeServlet和SessionReceiveServlet的完整代碼。①SessionScopeServlet的完整代碼：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); //轉發(fā) request.getRequestDispatcher("SessionReceiveServlet").forward(request,response); }}②SessionReceiveServlet的完整代碼：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{ //設置請求接收信息的編碼格式 request.setCharacterEncoding("UTF-8"); //接收傳過來的信息 HttpSessionsession=request.getSession(); Useru=(User)session.getAttribute("user"); //在控制臺打印輸出接收到的信息 System.out.println("name="+u.getName()+";password="+u.getPassword()+";age="+u.getAge()); }}請寫出ApplicationScopeServlet和ApplicationReceiveServlet的完整代碼。①ApplicationScopeServlet的完整代碼：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); //轉發(fā) request.getRequestDispatcher("ApplicationReceiveServlet").forward(request,response); }}②ApplicationReceiveServlet的完整代碼：packageexp5;importjava.io.IOException;importjavax.servlet.ServletContext;import