loginfilter.java

MM7彩信对接网关示例

/*
 * Created on 2005-11-30
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.rainbow.util.login;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 验证用户是否登录过，如果没有则跳转到登录的URL.
 * @author Rainbow MMS Platform Leader -- TrWorks
 *
 */
public class LoginFilter implements Filter {

	private String loginPage = "login.html";
	private String loginDoPage = "login.action";
	
	/* (non-Javadoc)
	 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
	 */
	public void init(FilterConfig arg0) throws ServletException {

	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest hr = (HttpServletRequest) arg0;
		HttpServletResponse hrs = (HttpServletResponse) arg1;
		
		// 判断现在是否是登陆页面,如果不是就要判断用户是否已经登陆了
		System.out.println("URL: " + hr.getRequestURI());
		if (hr.getRequestURI().endsWith(loginPage) == false &&
			hr.getRequestURI().endsWith(loginDoPage) == false){
			String isLogin = (String)hr.getSession().getAttribute("IsLogin");

			// 如果没有登陆,则返回到登陆页面
			if ("yes".equals(isLogin) == false){
				hrs.sendRedirect(this.loginPage);
			}
			else{
				arg2.doFilter(hr, hrs);
			}
		}	
		else{
			arg2.doFilter(hr, hrs);
		}
	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#destroy()
	 */
	public void destroy() {

	}

}