HTTP系列之http链接强转为https链接Filter

今天药忘吃喽~ 2021-09-14 14:56 295阅读 0赞

import java.io.IOException;
    import java.net.URI;
    import java.net.URISyntaxException;
    
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.annotation.WebFilter;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import lombok.extern.slf4j.Slf4j;
    /** * 
     * <pre>
     * HTTP过滤器，根据请求协议进行过滤，http的都强转到https。注意本类采用lombok的slf4j日志，Servlet要求3.0以上的才可以进行注解定义一个过滤器
     * </pre>
     * @author Nicky
     * @date：2018年01月19日 下午11:55:57 
     * <pre>
     * 修改记录
     *    修改后版本:     修改人：  修改日期:     修改内容: 
     * </pre>
     */
    @Slf4j
    @WebFilter(filterName="/Http2HttpsFilter",urlPatterns="/*")
    public class Http2HttpsFilter implements Filter {
    
        public Http2HttpsFilter() {
    
        }
    
        @Override
    	public void destroy() {
    		
    	}
    
        @Override
    	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    		HttpServletRequest req = (HttpServletRequest)request;
    		HttpServletResponse res = (HttpServletResponse)response;
    			
    		//获取请求协议
    		String scheme = request.getScheme();
    		log.info("转换前的链接为:"+req.getRequestURL()+"?"+req.getQueryString());
    		
    		
    		//http的url换成https的url
    		try{
    			if(req.getQueryString()!=null && !"".equals(req.getQueryString())){
    				reqUri = new URI(req.getRequestURL()+"?"+req.getQueryString());
    			}else{
    				reqUri = new URI(req.getRequestURL().toString());
    			}
    			
    			newUri = new URI("https", reqUri.getUserInfo(),
    	                reqUri.getHost(), reqUri.getPort(), reqUri.getPath(),
    	                reqUri.getQuery(), reqUri.getFragment());
    		}catch(URISyntaxException e){
    			e.printStackTrace();
    		}
    		
    		//根据请求协议进行过滤，请求协议为HTTP的都进行过滤
    		if(scheme.equals("http")){
    			
    			 log.info("转换后的链接为:"+newUri.toString());
    			
    			 //重定向
        		 res.sendRedirect(newUri.toString());
    //    		 res.sendRedirect(sbd.toString());
        		 //chain.doFilter(req, res);
        		 return;
    			
    		}else{
    			chain.doFilter(req, res);
    		}
    	}
    
        @Override
    	public void init(FilterConfig fConfig) throws ServletException {
    		
    	}
    
    }