JavaWeb: localhost 将您重定向的次数过多

╰+哭是因爲堅強的太久メ 2022-05-21 11:47 269阅读 0赞

JavaWeb开发遇到到的问题：

该网页无法正常运作
    localhost 将您重定向的次数过多。
    尝试清除 Cookie.
    ERR_TOO_MANY_REDIRECTS

原因是Filter把自己也给过滤了：  
`我这里是对所有页面都进行过滤，不满足条件则跳转到login.jsp，然而忘了给login.jsp加判断了`

package top.hsocode.Filters;
    
    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.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    public class StudentLoginFilter implements Filter { 
    
        private FilterConfig config;
        @Override
        public void destroy() {
            // TODO Auto-generated method stub
    
        }
    
        @Override
        public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
                throws IOException, ServletException {
            // TODO Auto-generated method stub
            HttpServletRequest request = (HttpServletRequest)arg0;
            HttpServletResponse response = (HttpServletResponse)arg1;
            HttpSession session = request.getSession();
    
    
            String noLoginPaths = config.getInitParameter("noLoginPaths");
            if (noLoginPaths != null) {
                String[] strArray = noLoginPaths.split(";");
                for (int i = 0; i < strArray.length; i++) {
                    if (strArray[i] == null || "".equals(strArray[i])) {
                        continue;
                    }
                    if(request.getRequestURI().indexOf(strArray[i]) != -1){
                        arg2.doFilter(arg0, arg1);
                        return;
                    }
                }
            }
    
    
            if (session.getAttribute("email") != null) {
                arg2.doFilter(arg0, arg1);
            }else {
                response.sendRedirect(request.getContextPath() + "/login.jsp");
            }
        }
    
        @Override
        public void init(FilterConfig arg0) throws ServletException {
            // TODO Auto-generated method stub
            config = arg0;
        }
    
    }

所以做以下修改就可以了

package top.hsocode.Filters;
    
    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.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    public class StudentLoginFilter implements Filter { 
    
        private FilterConfig config;
        @Override
        public void destroy() {
            // TODO Auto-generated method stub
    
        }
    
        @Override
        public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
                throws IOException, ServletException {
            // TODO Auto-generated method stub
            HttpServletRequest request = (HttpServletRequest)arg0;
            HttpServletResponse response = (HttpServletResponse)arg1;
            HttpSession session = request.getSession();
    
    
            String noLoginPaths = config.getInitParameter("noLoginPaths");
            if (noLoginPaths != null) {
                String[] strArray = noLoginPaths.split(";");
                for (int i = 0; i < strArray.length; i++) {
                    if (strArray[i] == null || "".equals(strArray[i])) {
                        continue;
                    }
                    if(request.getRequestURI().indexOf(strArray[i]) != -1){
                        arg2.doFilter(arg0, arg1);
                        return;
                    }
                }
            }
            /*修改部分*/
            if(request.getRequestURI().indexOf("/login.jsp") > -1){
                arg2.doFilter(arg0, arg1);
            } else if (session.getAttribute("email") != null) {
                arg2.doFilter(arg0, arg1);
            }else {
                response.sendRedirect(request.getContextPath() + "/login.jsp");
            }
            /*修改部分*/
        }
    
        @Override
        public void init(FilterConfig arg0) throws ServletException {
            // TODO Auto-generated method stub
            config = arg0;
        }
    
    }

现在就可以正常访问了