實(shí)現(xiàn)原理，在登錄成功時(shí)在session中添加數(shù)據(jù)，中書寫專門的攔截類判斷是否有數(shù)據(jù)，來判斷是否攔截，再在web.xml,中對攔截器進(jìn)行配置

攔截類SysInterceptor：package com.zkz.interceptor;

import com.zkz.pojo.MallUser;

import javax.servlet.*;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import java.io.IOException;

public class SysInterceptor implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

}

@Override

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

// 對全棧url進(jìn)行過濾

//將request和response對象強(qiáng)轉(zhuǎn)為http類型

HttpServletRequest req=(HttpServletRequest)request;

HttpServletResponse resp = (HttpServletResponse)response;

//獲取訪問的地址

String url = req.getRequestURI();

//獲取session中的對象判斷是否登錄

//攔截所有需要的url

//判斷session中是有USER值，有則是登錄過的

if(url.contains("/")) {

//獲取session

HttpSession session = req.getSession();

MallUser user=(MallUser) session.getAttribute("USER");

if(user==null){

resp.sendRedirect("/admain/notlogin.html");

return;

}

}

//繼續(xù)執(zhí)行過濾連的剩余部分

chain.doFilter(req, resp);

}

@Override

public void destroy() {

}

}

然后在web.xml中配置攔截器：

UrlFilter

com.zkz.interceptor.SysInterceptor

UrlFilter

/admain/pages/*

登錄(responseJsonResult是返回的一個類不用詳解)：@RequestMapping("/login")

@ResponseBody

public ResponseJsonResult page(@NotNull HttpServletRequest request, HttpSession session) throws IOException {

ResponseJsonResult responseJsonResult = new ResponseJsonResult();

String username = request.getParameter("username");

String password = request.getParameter("password");

boolean status = userService.longin(username, password);

MallUser mallUser = new MallUser();

if (status !=true){

session.setAttribute("USER", mallUser);

return responseJsonResult;

}

responseJsonResult.setStatus(200);

return responseJsonResult;

}

總結(jié)

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