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jsp页面跳转和请求的各种方法

2015-10-30 16:50 507 查看 
<%@ 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="${pageContext.request.contextPath}/imgs/submit.jpg"
style="cursor: pointer; width: 50px; height: 50px">
</a>
<!--此处是利用a标签进行服务器端的请求，参数的传递在链接后面用？连接-->
<a
href="${pageContext.request.contextPath}/jsppage/requestpage.ht?name=merida">
<img src="${pageContext.request.contextPath}/imgs/submit.jpg"
style="cursor: pointer; width: 50px; height: 50px">
</a>
<hr>
<!--此处是利用form标签中的action属性来向服务器发送请求-->
<form
action="${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>
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