web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>testServlet2</servlet-name>
<servlet-class>servlet.testServlet2</servlet-class>
</servlet> <servlet-mapping>
<servlet-name>testServlet2</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
jsp：
<%@ page language="java" import="java.util.*,common.DBConnection" pageEncoding="gbk"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><html>
<head>
</head>
<body>
<a href="test">do</a>
</body>
</html>
servlet包下的testServlet2:
package 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 testServlet2 extends HttpServlet { /**
* Constructor of the object.
*/
public testServlet2() {
super();
} /**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}}
报错：
type Status reportmessage /ownHome_Version_0107_00/testdescription The requested resource (/ownHome_Version_0107_00/test) is not available.
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>testServlet2</servlet-name>
<servlet-class>servlet.testServlet2</servlet-class>
</servlet> <servlet-mapping>
<servlet-name>testServlet2</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
jsp：
<%@ page language="java" import="java.util.*,common.DBConnection" pageEncoding="gbk"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><html>
<head>
</head>
<body>
<a href="test">do</a>
</body>
</html>
servlet包下的testServlet2:
package 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 testServlet2 extends HttpServlet { /**
* Constructor of the object.
*/
public testServlet2() {
super();
} /**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}}
报错：
type Status reportmessage /ownHome_Version_0107_00/testdescription The requested resource (/ownHome_Version_0107_00/test) is not available.
在IE中提示“404”错误有以下三种情况1．未部署Web应用
2．URL输入错误
排错方法：首先，查看URL的IP地址和端口号是否书写正确。 其次，查看上下文路径是否正确 Project--------Properties------MyElipse-----Web-----Web Context-root检查这个路径名称是否书写正确。最后，检查一下文件名称是否书写正确。3．目录不能被引用
排错方法： 在 Eclipse的“包资源管理器(Package Explorer)”检查文件存放的位置。由于META-INFWEB-INF文件夹下的内容无法对外发布，所以，如果你引用了带这两个目录的文件，肯定是不允许。例如： http://localhost:8080/guestbook/WEB-INF/index.html就是错误的文件位置存放错误4. Tomcat服务器中web.xml中的问题
排错方法： 如果你的web应用程序有多个jsp页面的话，当你点击你web应用程序的虚拟根目录时可能会出现404错 误，只是你只需要修改Tomcat服务器中web.xml <init-param>
<param-name>listings</param-name>
<param-value>false(将其该为true)</param-value>
</init-param>
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/IBM_linghb1985/archive/2009/02/06/3866817.aspx