Java中HttpServletRequestWrapper实现xss注入的实例

    <filter>  
            <filter-name>XssEscape</filter-name>  
            <filter-class>cn.pconline.morden.filter.XssFilter</filter-class>  
        </filter>  
        <filter-mapping>  
            <filter-name>XssEscape</filter-name>  
            <url-pattern>/*</url-pattern>  
            <dispatcher>REQUEST</dispatcher>  
        </filter-mapping>

    package cn.pconline.morden.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;  
      
    public class XssFilter implements Filter {  
          
        @Override  
        public void init(FilterConfig filterConfig) throws ServletException {  
        }  
      
        @Override  
        public void doFilter(ServletRequest request, ServletResponse response,  
                FilterChain chain) throws IOException, ServletException {  
            chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request), response);  
        }  
      
        @Override  
        public void destroy() {  
        }  
    }

    package cn.pconline.morden.filter;  
      
    import javax.servlet.http.HttpServletRequest;  
    import javax.servlet.http.HttpServletRequestWrapper;  
      
    import org.apache.commons.lang3.StringEscapeUtils;  
      
    public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {  
      
        public XssHttpServletRequestWrapper(HttpServletRequest request) {  
            super(request);  
        }  
      
        @Override  
        public String getHeader(String name) {  
            return StringEscapeUtils.escapeHtml4(super.getHeader(name));  
        }  
      
        @Override  
        public String getQueryString() {  
            return StringEscapeUtils.escapeHtml4(super.getQueryString());  
        }  
      
        @Override  
        public String getParameter(String name) {  
            return StringEscapeUtils.escapeHtml4(super.getParameter(name));  
        }  
      
        @Override  
        public String[] getParameterValues(String name) {  
            String[] values = super.getParameterValues(name);  
            if(values != null) {  
                int length = values.length;  
                String[] escapseValues = new String[length];  
                for(int i = 0; i < length; i++){  
                    escapseValues[i] = StringEscapeUtils.escapeHtml4(values[i]);  
                }  
                return escapseValues;  
            }  
            return super.getParameterValues(name);  
        }  
          
    }