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Filter案例

2024-10-03 15:38:02   215人阅读

package com.gqx.demo1;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class AuthorityServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
     
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String methodName=request.getParameter("method");
        //为了让一个servlet响应多个请求，这里可以使用反射
        try {
            Method method=getClass().getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);
            method.invoke(this, request,response);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.doGet(request, response);
    }
     
    private UserDao userDao=new UserDao();
    //获取用户所有的信息
    public void getAuthorities(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String userName=request.getParameter("username");
        User user =userDao.get(userName);
        request.setAttribute("user", user);
        request.setAttribute("authorities", userDao.getAuthorities());
        request.getRequestDispatcher("/authority-manager.jsp").forward(request, response);
    }
                             
    public void updateAuthority(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String username = request.getParameter("username");
     
            String [] authorities = request.getParameterValues("authority");
            List<Authority> authorityList = userDao.getAuthorities(authorities);
             
            userDao.update(username, authorityList);
            response.sendRedirect(request.getContextPath() + "/authority-manager.jsp");
         
    }
     
}

Filter案例


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