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  • Java乔晓松使用Filter过滤器清除网页缓存

    package www.csdn.dbshop.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.HttpServletResponse;
    
    
    public class CacheFilter implements Filter {
    
    
    	public void destroy() {
    		System.out.println("缓存Filter------销毁操作");
    
    
    	}
    
    
    	public void doFilter(ServletRequest request, ServletResponse response,
    			FilterChain chain) throws IOException, ServletException {
    		System.out.println("清除缓存................");
    		//response对象
    		HttpServletResponse res = (HttpServletResponse) response;
    		// 设定网页的到期时间,一旦过期则必须到服务器上重新调用
    		res.setDateHeader("Expires", -1);
    		// Cache-Control 指定请求和响应应遵循的缓存机制 no-cache指示请求或响应消息是不能缓存的
    		res.setHeader("Cache-Control", "no-cache");
    		// 用于设定禁止浏览器从本地缓存中调用页面内容,设定后一旦离开页面就无法从Cache中再调出
    		res.setHeader("Pragma", "no-cache");
    		// 放行
    		chain.doFilter(request, res);
    
    
    	}
    
    
    	public void init(FilterConfig filterConfig) throws ServletException {
    		System.out.println("初始化数据-----缓存清除");
    
    
    	}
    
    
    }



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  • 原文地址:https://www.cnblogs.com/javawebsoa/p/3042328.html
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