cookie登录功能实现

淩亂°似流年 2022-08-27 14:57 238阅读 0赞

网站常用的记住我，或是一周内自动登录，这些功能一般都是是用cookie进行登录的！下面对此功能进行分析：

package cookielogin;
    
    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.Cookie;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class CookieLogin implements Filter {
    
    	private static final String USERNAME = "username";
    	private static final String PASSWORD = "password";
    
    	@Override
    	public void destroy() {
    		// TODO Auto-generated method stub
    
    	}
    
    	@Override
    	public void doFilter(ServletRequest request, ServletResponse response,
    			FilterChain chain) throws IOException, ServletException {
    
    		HttpServletRequest req = (HttpServletRequest) request;
    		HttpServletResponse resp = (HttpServletResponse) response;
    
    		Cookie username = this.getCookie(req, USERNAME);
    		Cookie password = this.getCookie(req, PASSWORD);
    
    		if (null != username && null != password) {
    
    			System.out.println("用户登录");
    			// userService.login(username.getValue,password.getValue());
    			System.out.println("username:" + username.getValue() + ",password:"
    					+ password.getValue());
    
    		} else {
    			//保存cookie
    			resp.setCharacterEncoding("UTF-8");
    			
    			Cookie nameCookie = new Cookie(USERNAME, "username");
    			
    			Cookie passCookie = new Cookie(PASSWORD, "password");
    
    			resp.addCookie(nameCookie);
    			resp.addCookie(passCookie);
    		}
    		chain.doFilter(req, resp);
    	}
    
    	public Cookie getCookie(HttpServletRequest request, String cookieName) {
    
    		Cookie[] cookies = request.getCookies();
    
    		if (null == cookies) {
    			return null;
    		}
    
    		for (Cookie c : cookies) {
    			if (c.getName().equals(cookieName)) {
    				return c;
    			}
    		}
    
    		return null;
    	}
    
    	@Override
    	public void init(FilterConfig arg0) throws ServletException {
    
    	}
    
    }

测试时需要在web.xm加入拦截器！