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封装类  package com.weidu.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
  /** *//**
 *
* 标题：servlet跳转基类<br>
* 描述：用户打开链接时传递参数method即可跳转到相应的方法，示例：users?method=add，参数有：add,update,del,select<br>
* 实现时需覆写父类相应的方法。 如果新增方法时覆写addMethod（）方法，添加判断并调用即可<br>
* 示例：@Override protected boolean addMethod(String method) {<br>
* if (method.equals("login")) {<br>
* login();<br>
* return true;<br>
* }<br>
* return super.addMethod(method);<br>
* }<br>
*
* 作者：feezh<br>
* 邮箱：feezh@qq.com <br>
* 日期：2012-7-18 时间：下午04:02:35 <br>
* 版本：1.0 <br>
 */
public class BaseServlet extends HttpServlet  {
  public BaseServlet() {
super();
 }
/** *//**
*
* 功能说明: 添加新的方法<br>
* 作者：feezh <br>
* 日期：2012-7-18 时间：下午04:30:02 <br>
*
* @param method
*
*/
protected boolean addMethod(String method) {
return false;
}
/** *//**
* 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 {
doPost(request, response);
}
/** *//**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @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 doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
String method = request.getParameter("method");
if (method == null || method.equals("select")) {
select(request, response);
} else if (method.equals("del")) {
del(request, response);
} else if (method.equals("update")) {
update(request, response);
} else if (method.equals("add")) {
add(request, response);
} else if (addMethod(method)) {
} else {
response.sendError(HttpServletResponse.SC_NOT_FOUND, "路径不存在！");
}
}
/** *//**
* 功能说明: 删除信息<br>
* 作者：feezh <br>
* 日期：2012-7-18 时间：下午04:02:57 <br>
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void del(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
/** *//**
*
* 功能说明: 添加信息<br>
* 作者：feezh <br>
* 日期：2012-7-18 时间：下午04:02:49 <br>
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void add(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
/** *//**
*
* 功能说明: 修改信息<br>
* 作者：feezh <br>
* 日期：2012-7-18 时间：下午04:03:07 <br>
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void update(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
/** *//**
*
* 功能说明: 查询信息<br>
* 作者：feezh <br>
* 日期：2012-7-18 时间：下午04:03:13 <br>
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void select(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
测试类 package com.weidu.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/** *//**
* 标题：<br>
* 描述：TODO<br>
* 作者：feezh<br>
* 邮箱：feezh@qq.com <br>
* 日期：2012-7-18 时间：下午04:04:44 <br>
* 版本：1.0 <br>
*/
public class UsersServlet extends BaseServlet {
/** *//**
* @Fields serialVersionUID : TODO
*/
private static final long serialVersionUID = 1L;
@Override
public void del(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
super.del(request, response);
System.out.println("删除");
}
@Override
public void add(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
super.add(request, response);
System.out.println("添加");
}
@Override
public void update(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
super.update(request, response);
System.out.println("修改");
}
@Override
public void select(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
super.select(request, response);
System.out.println("查询");
}
@Override
protected boolean addMethod(String method) {
if (method.equals("login")) {
login();
return true;
}
return super.addMethod(method);
}
public void login() {
System.out.println("登录");
}
}
web.xml
<servlet>
<servlet-name>UsersServlet</servlet-name>
<servlet-class>com.weidu.servlet.UsersServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UsersServlet</servlet-name>
<url-pattern>/Users</url-pattern>
</servlet-mapping> 访问路径： http://localhost/Users?method=login
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