XSS跨站点脚本攻击拦截器

别的就不说了，直接上代码：
1、web.xml文件的配置

    <!-- xss跨站点脚本攻击拦截器 -->
<filter>
    <filter-name>xssFilter</filter-name>
    <filter-class>com.gzqh.common.interceptor.XSSFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>xssFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

2、拦截器代码
1）类1代码：
package com.gzqh.common.interceptor;

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 {  

    XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper(  
            (HttpServletRequest) request);  
    chain.doFilter(xssRequest, response);  
}  

@Override 
public void destroy() {  
} 

}

2）类2代码
package com.gzqh.common.interceptor;

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;  
}  

/** 
 * 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 '(':
            break;
        case ')':
            break;
        case ';':
            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;  
}  

}