maven项目登录使用拦截器

墨蓝 2022-05-22 04:53 53阅读 0赞

登录页面展示

![70][]

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
        <form action="loginOpt.action" method="post">
      用户登录 
          名字<input name="uname"><br>
          密码<input name="pwd"><br>
          <input type="submit">
        </form>
    </body>
    </html>

跳转登录页面	
    
    @RequestMapping("tologin")
    
    	public ModelAndView tologin(){
    		return new ModelAndView("user/login");
    	}

//点击登录按钮跳转访问方法
    
    	@RequestMapping("loginOpt")
    	public String loginOpt(HttpSession session,String uname,String pwd){
    	//用户密码正确进入列表页面  错误重新登录
    
    		if (uname!=null&&pwd!=null) {
    
    			User sUser=userService.getByName(uname,pwd);
    			if (sUser!=null) {
    				session.setAttribute("id", sUser.getId());
    				return "user/list";
    			}
    		}
    		return "user/login";
    	}

运用拦截器
    
    //普通类继承HandlerInterceptorAdapter就可以
    public class SystemInterceptor extends HandlerInterceptorAdapter {
    	/**
    	 * 在业务处理器处理请求之前被调用 如果返回false 拦截 如果返回true 继续
    	 */
    	@Override
    	public boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler) throws Exception {
    		//对编码进行处理
    		request.setCharacterEncoding("UTF-8");
    		response.setCharacterEncoding("UTF-8");
    		response.setContentType("text/html;charset=UTF-8");
    		String path = request.getServletPath();//获取当前访问路径
    		String root = request.getContextPath();//获取项目的上下文
    		String noFilter = ".*/((tologin)|(register)|(loginOpt)|(getCode)|(common)|(file)|(portal)|(getAllList)|(getByPid)).*";//配置不需要session拦截的方法
    		if(path.matches(noFilter)){//正则匹配，不需要拦截的返回TRUE，放行
    			return true;
    		} else{
    			Object obj = request.getSession().getAttribute("id");//获取用户对象session
    			if (null == obj) {//如果session为null，表示没有登录
    				//如果没有登录，跳转到登录页面
    				PrintWriter out = response.getWriter();
    				StringBuilder builder = new StringBuilder();
    				builder.append("<script type=\"text/javascript\" charset=\"UTF-8\">");
    				builder.append("window.top.location.href=\"");
    				builder.append(root);
    				builder.append("/user/tologin.action\";</script>");
    				out.print(builder.toString());
    				out.close();
    				return false;
    			}
    		}
    		return true;
    	}
    
    }

配置拦截
    
    	
     	<mvc:interceptors> 
     		<bean class="拦截器路径" />
     	</mvc:interceptors>

[70]: /images/20220522/1219b010f0964e77891ebf83bb4260de.png