只是在书上看到了RequestDispatcher对象的Include方法可以将多个单功能的文件例如.jsp文件整合成一个Servlet文件
今天上网找到一个很好的实例来说明这一点。很感谢此作者！^_^
public class TestDispatcher extends javax.servlet.http.HttpServlet implements
javax.servlet.Servlet ......{
public TestDispatcher() ......{
super();
} protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException ......{ doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException ......{ RequestDispatcher rd ; rd = request.getRequestDispatcher("TestDispatcher1"); rd.include(request, response); //String hello = (String) request.getAttribute("hello"); //System.out.println(hello); rd = request.getRequestDispatcher("/test/test51.jsp"); rd.include(request, response); rd = request.getRequestDispatcher("/test/test5.jsp"); rd.include(request, response); }
}
public class TestDispatcher1 extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet ......{ public TestDispatcher1() ......{ super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException ......{ doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException ......{ request.setAttribute("hello", "hello"); response.getWriter().write("this is servlet2<br>"); response.sendRedirect("http://www.youkuaiyun.com"); }}
<%...@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%...@ taglib uri="/WEB-INF/c.tld" prefix="c" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body> <c:out value="${hello}"></c:out> <br> this is test51.jsp. <br></body></html>
<%...@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body>this is test5.jsp.</body></html>
输出结果： this is servlet2
hello
this is test51.jsp
this is test5.jsp
总结：servlet1中include另外一个servlet2,会计算servlet2,最终转向servlet1决定，servlet2中的request和response对象中存储的数据被和并到servlet1的request和response对象中。
servlet中include一个jsp页，相当于：jsp中<%@ include file="XXX.jsp" %>
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