在java web 工程中实现登录和安全验证

登录验证代码

package security;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import model.User;

@WebServlet("/login.do")
public class Login extends HttpServlet {
	private static final long serialVersionUID = 1L;

	private final String ERROR_VIEW = "admin-login.jsp";

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

		String username = request.getParameter("username");//从地址栏获取用户名
		String password = request.getParameter("password");//从地址栏获取密码

		//判断用户名密码是否正确
		if(username.equals("user") && password.equals("88888")) {
			HttpSession session = request.getSession(true);

			//密码正确则设置一个session
			session.setAttribute("user", new User(username,password));
			putCookie(request,response,username);
			//跳转到后台界面
			request.getRequestDispatcher("console/admin.jsp").forward(request, response);
		}else {
			request.getRequestDispatcher(ERROR_VIEW).forward(request, response);
		}

	}

	private void putCookie(HttpServletRequest request, HttpServletResponse response, String username) {
		String value = request.getParameter("login");
		//设置一个cookie
		if ("auto".equals(value)) {
			Cookie cookie = new Cookie("user", username);
			cookie.setMaxAge(7 * 24 * 60 * 60);
			response.addCookie(cookie);
		}
	}

}

2.过滤器安全验证代码

package security;
/**
 * @author 鐜嬭儨鍗?
 */
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.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.ObjectUtils;

//过滤以/console/,/admin/开头的请求
@WebFilter(urlPatterns = { "/console/*", "/admin/*" }, initParams = {
		@WebInitParam(name = "INDEX_VIEW", value = "/index.jsp") })
public class MemberFilter implements Filter {

	private String INDEX_VIEW;

	@Override
	public void init(FilterConfig config) throws ServletException {
		this.INDEX_VIEW = config.getInitParameter("INDEX_VIEW");
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
	throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;

		if (ObjectUtils.anyNotNull(req.getSession().getAttribute("user"))) {
			chain.doFilter(request, response);
		} else {
			HttpServletResponse resp = (HttpServletResponse) response;
			resp.sendRedirect(req.getContextPath() + INDEX_VIEW);
		}
	}

	@Override
	public void destroy() {
	}

}