很多朋友第一接觸javaweb和servlet想實(shí)現(xiàn)管理系統(tǒng)中不同用戶角色進(jìn)入相應(yīng)權(quán)限的頁(yè)面進(jìn)行相應(yīng)權(quán)限的操作功能，總的來(lái)說(shuō)有很多方法，最簡(jiǎn)單想到就是直接在用戶數(shù)據(jù)庫(kù)中插入一列帶有權(quán)限的字段(permission number)，然后查詢的時(shí)候，將值返回到對(duì)應(yīng)的serlvet頁(yè)面（LoginServlet.java），用簡(jiǎn)單的if判斷即可。 下面是具體代碼：

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LoginServlet.java:

package com.cola.controller;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.cola.entity.Userjia;
import com.cola.manager.impl.UserManagerOracleImpl;

public class LoginServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	doPost(request,response);
	}


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");		

			Userjia user = new Userjia();

			user.setUsername(request.getParameter("userName"));
			user.setUserpasswd(request.getParameter("passwd"));
			//獲取類型
			System.out.println(user.getUsername());
			request.setAttribute("haha", user);

			UserManagerOracleImpl userManager = new UserManagerOracleImpl();

			int permission = userManager.isValid(user);
			// permssion = 1 為管理員  =0 為普通用戶


			//判斷類型
			if(permission==1){
					request.getRequestDispatcher("/index.html").forward(request, response);
					System.out.println("userName------------>"+user.getUsername());
				}else if(permission==0){
					request.getRequestDispatcher("/index2.html").forward(request,response);
					System.out.println("userName------------>"+user.getUsername());
				}else if(permission==-1){
					request.getRequestDispatcher("/failed.html").forward(request,response);
				}
			}
}

userManager 中isValid(User ueser)的方法：//用于將permission 回調(diào)的方法，用于判斷

	/***************************************************************
	 * 
	 * 驗(yàn)證登陸用戶
	 * 
	 * *************************************************************/	
	public int isValid(Userjia user){
		
		int permission = -1;
		
		Connection conn = null;
		ResultSet rs = null;
		Statement stmt = null;
		conn=ConnectionFactory.getConnection();  	
		try {
			 stmt = conn.createStatement();
			 rs = stmt.executeQuery
			 	("select * from login_user where name ='"
			 			+user.getUsername()+"' and passwd= '"+user.getUserpasswd()+"' ");
			 if(rs.next()){
				permission = rs.getInt("permission");
				 
			 }
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			CloseResource.release(rs, stmt, conn);
		}
		
		return permission;
	}

至此，功能基本實(shí)現(xiàn)。