使用Filter过滤器，控制不能直接访问JSP文件

冷不防 2022-08-03 13:48 86阅读 0赞

在项目中，我们需要控制用户不能直接访问JSP页面，需要实现此功能很简单，1.使用过滤器控制如果用户请求了JSP页面，直接跳转到指定的URL，如主页，2.在web.xml文件中配置，当服务器启动时，自动加载过滤器

1、编码JspFilter过滤器，需要实现Filter

package com.weixin.common.filter;
    
    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;
    
    /**
     * JSP过滤器,不能直接访问JSP
     * 
     * @author Administrator
     *
     */
    public class JspFilter implements Filter {
    
    	@Override
    	public void init(FilterConfig filterConfig) throws ServletException {
    		// TODO Auto-generated method stub
    
    	}
    
    	@Override
    	public void doFilter(ServletRequest request, ServletResponse response,
    			FilterChain chain) throws IOException, ServletException {
    		HttpServletRequest httpServletRequest = (HttpServletRequest) request;
    		HttpServletResponse httpServletResponse = (HttpServletResponse) response;
    		
    		String url = httpServletRequest.getRequestURI();
    		if (url != null && url.endsWith(".jsp")) {
    			// TODO 这里可以跳转到主页
    			String contextPath = httpServletRequest.getContextPath();
    			httpServletResponse.sendRedirect(contextPath + "/user/index.do");
    			return;
    		}
    		chain.doFilter(httpServletRequest, httpServletResponse);
    
    	}
    
    	@Override
    	public void destroy() {
    		// TODO Auto-generated method stub
    
    	}
    
    }

2、web.xml中配置过滤器，当服务器启动时，自动加载过滤器

<filter>
      	<filter-name>jspFilter</filter-name>
      	<filter-class>com.weixin.common.filter.JspFilter</filter-class>
      </filter>
      <filter-mapping>
      	<filter-name>jspFilter</filter-name>
      	<url-pattern>/*</url-pattern>
      </filter-mapping>