防止SQL注入和XSS攻击Filter

包装器：

/**
 * <code>{@link XssHttpServletRequestWrapper}</code>
 *
 * TODO : document me
 *
 * @author Administrator
 */
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 || "".equals(s)) {
            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(‘＞‘);//全角大于号
                break;
            case ‘<‘:
                sb.append(‘＜‘);//全角小于号
                break;
            case ‘\‘‘:
                sb.append(‘‘‘);//全角单引号
                break;
            case ‘\"‘:
                sb.append(‘“‘);//全角双引号
                break;
            case ‘&‘:
                sb.append(‘＆‘);//全角
                break;
            case ‘\\‘:
                sb.append(‘＼‘);//全角斜线
                break;
            case ‘#‘:
                sb.append(‘＃‘);//全角井号
                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;
    }

}

防止SQL注入和XSS攻击Filter

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