解决xss漏洞

 web.xml

<filter>
		<filter-name>xssFilter</filter-name>
		<filter-class>com.aoi.selfhelp.filters.XSSFilter</filter-class>
	</filter>

	<!-- 解决xss漏洞 -->
	<filter-mapping>
		<filter-name>xssFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

package com.aoi.selfhelp.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 com.cmcc.aoi.selfhelp.util.XssHttpServletRequestWrapper;
  
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 {  
  
        XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper(  
                (HttpServletRequest) request);  
        chain.doFilter(xssRequest, response);  
    }  
  
    @Override  
    public void destroy() {  
    }  
  
}  

package com.aoi.selfhelp.util;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper
{
	HttpServletRequest orgRequest = null;

	public XssHttpServletRequestWrapper(HttpServletRequest request)
	{
		super(request);
		orgRequest = request;
	}

	@Override
	public String[] getParameterValues(String name)
	{
		String[] parameterValues = super.getParameterValues(name);
		if (parameterValues == null)
			parameterValues = new String[] {};
		for (int i = 0; i < parameterValues.length; i++)
		{
			String value = parameterValues[i];
			if (value != null)
			{
				parameterValues[i] = xssEncode(value);
			}
		}
		return parameterValues;
	}

	/**
	 * 覆盖getParameter方法，将参数名和参数值都做xss过滤。<br/>
	 * 如果需要获得原始的值，则通过super.getParameterValues(name)来获取<br/>
	 * getParameterNames,getParameterValues和getParameterMap也可能需要覆盖
	 */
	@Override
	public String getParameter(String name)
	{
		String value = super.getParameter(xssEncode(name));
		if (value != null)
		{
			value = xssEncode(value);
		}
		return value;
	}

	/**
	 * 覆盖getHeader方法，将参数名和参数值都做xss过滤。<br/>
	 * 如果需要获得原始的值，则通过super.getHeaders(name)来获取<br/>
	 * getHeaderNames 也可能需要覆盖
	 */
	@Override
	public String getHeader(String name)
	{

		String value = super.getHeader(xssEncode(name));
		if (value != null)
		{
			value = xssEncode(value);
		}
		return value;
	}

	/**
	 * 将容易引起xss漏洞的半角字符直接替换成全角字符
	 * 
	 * @param s
	 * @return
	 */
	private static String xssEncode(String s)
	{
		if (s == null || s.isEmpty())
		{
			return s;
		}
		StringBuilder sb = new StringBuilder(s.length() + 16);
		for (int i = 0; i < s.length(); i++)
		{
			char c = s.charAt(i);
			switch (c)
			{
				case '>':
					sb.append("＞");// 转义大于号
					break;
				case '<':
					sb.append("＜");// 转义小于号
					break;
				case '\'':
					sb.append("＇");// 转义单引号
					break;
				case '\"':
					sb.append("＂");// 转义双引号
					break;
				// case '&':
				//	sb.append("＆");// 转义&
				//	break;
				default:
					sb.append(c);
					break;
			}
		}
		return sb.toString();
	}

	/**
	 * 获取最原始的request
	 * 
	 * @return
	 */
	public HttpServletRequest getOrgRequest()
	{
		return orgRequest;
	}

	/**
	 * 获取最原始的request的静态方法
	 * 
	 * @return
	 */
	public static HttpServletRequest getOrgRequest(HttpServletRequest req)
	{
		if (req instanceof XssHttpServletRequestWrapper)
		{
			return ((XssHttpServletRequestWrapper) req).getOrgRequest();
		}

		return req;
	}
}

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