Servlet 转发、包含、重定向对比
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Servlet 转发、包含、重定向对比
在index.jsp页面中有一个form表单，提交到TestASerlvet处理，在TestASerlvet我们将请求转发到TestBSerlvet
示例代码：
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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=UTF-8"><title></title></head><body><form action="TestASerlvet" method="post">姓名：<input type="text" name="name" /><button>提交</button></form></body></html>web.xml
<servlet><servlet-name>TestASerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestASerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestASerlvet</servlet-name><url-pattern>/TestASerlvet</url-pattern></servlet-mapping><servlet><servlet-name>TestBSerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestBSerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestBSerlvet</servlet-name><url-pattern>/TestBSerlvet</url-pattern></servlet-mapping>TestASerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestASerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */PrintWriter out = response.getWriter();out.println("这里是TestASerlvet...");// 这里不能关闭输出流// 转发到TestBSerlvetrequest.getRequestDispatcher("TestBSerlvet").forward(request, response);}}TestBSerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestBSerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */String name = request.getParameter("name");// 获取到提交的数据PrintWriter out = response.getWriter();out.println("name: " + name);out.println("这里是TestBSerlvet...");out.flush();out.close();}}结果截图：
部署运行项目后，我们提交表单我们发现地址栏的URL没有改变还是TestASerlvet，页面的内容只显示了TestBSerlvet的内容并且能够接受到传递的数据。得出结论：转发地址栏URL不会改变，显示的内容为转发到的Servlet内容，数据能够共享。
2、包含
示例代码：
index.jsp<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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=UTF-8"><title></title></head><body><form action="TestASerlvet" method="post">姓名：<input type="text" name="name" /><button>提交</button></form></body></html>web.xml
<servlet><servlet-name>TestASerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestASerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestASerlvet</servlet-name><url-pattern>/TestASerlvet</url-pattern></servlet-mapping><servlet><servlet-name>TestBSerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestBSerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestBSerlvet</servlet-name><url-pattern>/TestBSerlvet</url-pattern></servlet-mapping>package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestASerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */PrintWriter out = response.getWriter();out.println("这里是TestASerlvet...");// 这里不能关闭输出流// 包含TestBSerlvetrequest.getRequestDispatcher("TestBSerlvet").include(request, response);}}TestBSerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestBSerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */String name = request.getParameter("name");// 获取到提交的数据PrintWriter out = response.getWriter();out.println("name: " + name);out.println("这里是TestBSerlvet...");out.flush();out.close();}}结果截图：
提交表单后，我们发现地址栏的URL没有改变还是TestASerlvet，页面的内容不仅显示了TestASerlvet的内容，还显示了TestBSerlvet的内容，并且能够接受到传递的数据。得出结论：包含地址栏URL不会改变，显示的内容为转发到的Servlet内容和原来servlet共同的内容，数据能够共享。
3、重定向
示例代码：
index.jsp<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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=UTF-8"><title></title></head><body><form action="TestASerlvet" method="post">姓名：<input type="text" name="name" /><button>提交</button></form></body></html>web.xml
<servlet><servlet-name>TestASerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestASerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestASerlvet</servlet-name><url-pattern>/TestASerlvet</url-pattern></servlet-mapping><servlet><servlet-name>TestBSerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestBSerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestBSerlvet</servlet-name><url-pattern>/TestBSerlvet</url-pattern></servlet-mapping>TestASerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestASerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */PrintWriter out = response.getWriter();out.println("这里是TestASerlvet...");// 这里不能关闭输出流//重定向到TestBSerlvetresponse.sendRedirect("TestBSerlvet");}}TestBSerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestBSerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */String name = request.getParameter("name");// 获取到提交的数据PrintWriter out = response.getWriter();out.println("name: " + name);out.println("这里是TestBSerlvet...");out.flush();out.close();}}截图：
提交表单后，地址栏发送改变（默认提交后的地址栏是http://localhost:8080/MyServlet_js/TestASerlvet），不能接收到传递的数据（数据不能共享），只显示重定向后的servlet。
注：转发、包含发送在一次请求内 ，重定向发送在两次请求上
web.xml
<servlet><servlet-name>TestASerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestASerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestASerlvet</servlet-name><url-pattern>/TestASerlvet</url-pattern></servlet-mapping><servlet><servlet-name>TestBSerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestBSerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestBSerlvet</servlet-name><url-pattern>/TestBSerlvet</url-pattern></servlet-mapping>web.xml
<servlet><servlet-name>TestASerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestASerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestASerlvet</servlet-name><url-pattern>/TestASerlvet</url-pattern></servlet-mapping><servlet><servlet-name>TestBSerlvet</servlet-name><servlet-class>cn.sz.hcq.servlet.TestBSerlvet</servlet-class></servlet><servlet-mapping><servlet-name>TestBSerlvet</servlet-name><url-pattern>/TestBSerlvet</url-pattern></servlet-mapping>TestASerlvet
TestBSerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestASerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */PrintWriter out = response.getWriter();out.println("这里是TestASerlvet...");// 这里不能关闭输出流// 转发到TestBSerlvetrequest.getRequestDispatcher("TestBSerlvet").forward(request, response);}}TestBSerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestBSerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */String name = request.getParameter("name");// 获取到提交的数据PrintWriter out = response.getWriter();out.println("name: " + name);out.println("这里是TestBSerlvet...");out.flush();out.close();}}TestASerlvet
TestBSerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestASerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */PrintWriter out = response.getWriter();out.println("这里是TestASerlvet...");// 这里不能关闭输出流// 转发到TestBSerlvetrequest.getRequestDispatcher("TestBSerlvet").forward(request, response);}}TestBSerlvet
package cn.sz.hcq.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestBSerlvet extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");// 处理Post请求中文乱码response.setHeader("Content-Type", "text/html;charset=utf-8");/* 处理中文响应乱码 */String name = request.getParameter("name");// 获取到提交的数据PrintWriter out = response.getWriter();out.println("name: " + name);out.println("这里是TestBSerlvet...");out.flush();out.close();}}阅读全文
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