Java Web登录自动填入用户名密码

package servlet; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; 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 org.apache.commons.lang3.StringUtils; import bean.DBConnection; @SuppressWarnings("serial") @WebServlet("/loginservlet") public class LoginServlet extends HttpServlet{ @SuppressWarnings("unused") public void doPost(HttpServletRequest request,HttpServletResponse response){ String uname = request.getParameter("Uname"); String upwd = request.getParameter("Upwd"); HttpSession session = request.getSession(true); int id = 0; String sql = "select * from user where userpwd = '" + upwd + "' and username = '" + uname + "'"; DBConnection dbc = new DBConnection(); try { id = dbc.getUser(sql); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } if(id > 0){ String cookie = uname + "," +upwd; try { addCookie(cookie,response,request); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { session.setAttribute("id", id); request.getRequestDispatcher("index.jsp").forward(request, response); } catch (ServletException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public static void addCookie(String unamepwd,HttpServletResponse response,HttpServletRequest request)throws UnsupportedEncodingException{ if(StringUtils.isNotBlank(unamepwd)){ //创建cookie Cookie cookie = new Cookie("unamepwd",URLEncoder.encode(unamepwd, "utf-8")); cookie.setPath(request.getContextPath() + "/"); //设置cookie保存时间 单位：秒 cookie.setMaxAge(24*60*60); //将cookie添加到相应 response.addCookie(cookie); } } }