<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html > <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>首先请求显示的页面</title> </head> <body> <hr> <!--获取项目的应用名--> ${pageContext.request.contextPath} <hr> <!--全部使用的是绝对路径--> <!--此处是利用a标签进行客户端页面的跳转--> <a href="${pageContext.request.contextPath}/jsppage/requestpage.jsp"> <img src="${pageContext.request.contextPath}/imgs/submit.jpg" style="cursor: pointer; 50px; height: 50px"> </a> <!--此处是利用a标签进行服务器端的请求，参数的传递在链接后面用？连接--> <a href="${pageContext.request.contextPath}/jsppage/requestpage.ht?name=merida"> <img src="${pageContext.request.contextPath}/imgs/submit.jpg" style="cursor: pointer; 50px; height: 50px"> </a> <hr> <!--此处是利用form标签中的action属性来向服务器发送请求--> <form action="${pageContext.request.contextPath}/jsppage/requestpage.ht"> name:<input type="text" name="name"> <input type="submit" value="提交"> </form> <hr> <h3>需要注意的是，获取到form对象，绑定一个submit()方法来实现表单的提交.</h3> <!--此处是将a标签的href属性设置为#，给a标签绑定一个鼠标的点击事件，点击事件中根据form表单的id属性获取form对象，给该对象绑定一个submit()。--> <form id="subform" action="${pageContext.request.contextPath}/jsppage/requestpage.ht"> name:<input type="text" name="name"> <a href="#" onclick="document.getElementById('subform').submit();return false"> <img src="${pageContext.request.contextPath}/imgs/提交.png" style="cursor: pointer;"> </a> </form> <hr> <form id="subform1" action="${pageContext.request.contextPath}/jsppage/requestpage.ht"> name:<input type="text" name="name"> <!--此处是将a标签的作用嫁接给img标签，同样可以实现表单的提交--> <img src="${pageContext.request.contextPath}/imgs/提交.png" style="cursor: pointer;" onclick="document.getElementById('subform1').submit();return false"> </a> </form> <hr> <!-- 请求转发：request.getRequestDispatcher(URL地址).forward(request, response) 此处是利用了请求的转发,来请求服务器 --> <%-- <% request.setAttribute("name", "GIANT"); /* request.getRequestDispatcher("${pageContext.request.contextPath}/jsppage.ht").forward(request, response); */ %> --%> <hr> <%-- <% /* 此处是利用转发来在客户端跳转页面 */ request.getRequestDispatcher("/jsppage/requestpage.jsp").forward(request, response); %> --%> <%-- 在JSP页面中，可以使用<jsp:forward>标签来转发请求 --%> <%-- <jsp:forward page="/jsppage/requestpage.jsp"> --%> </body> </html>
package ResponseServlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ResponseServlet extends HttpServlet { @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取项目的应用名 String path="\"+request.getServerName(); if(!(request.getParameter("name")==null)){ String name=request.getParameter("name"); response.getWriter().println("从request参数中获取的值"+name); response.sendRedirect(path+"/jsppage/Redirectpage.jsp"); }else{ String nameString=(String)request.getAttribute("name"); response.getWriter().println("从request作用域中get出的值"+nameString); response.sendRedirect(path+"/jsppage/Redirectpage.jsp"); } } }
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>requestmethod</display-name> <welcome-file-list> <welcome-file>/jsppage/index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>pagerequest</servlet-name> <servlet-class>ResponseServlet.ResponseServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>pagerequest</servlet-name> <url-pattern>*.ht</url-pattern> </servlet-mapping> </web-app>