java 过滤器filter防sql注入的实现代码

实例如下：

XSSFilter.java

public void doFilter(ServletRequest servletrequest,
			ServletResponse servletresponse, FilterChain filterchain)
			throws IOException, ServletException {

		//flag = true 只做URL验证; flag = false 做所有字段的验证;
		boolean flag = true;
		if(flag){
			//只对URL做xss校验
			HttpServletRequest httpServletRequest = (HttpServletRequest) servletrequest;
			HttpServletResponse httpServletResponse = (HttpServletResponse) servletresponse;

			String requesturi = httpServletRequest.getRequestURL().toString();
			requesturi = URLDecoder.decode(requesturi, "UTF-8");
			if(requesturi!=null&&requesturi.indexOf("alipay_hotel_book_return.html")!=-1){
				filterchain.doFilter(servletrequest, servletresponse);
				return;
			}
			if(requesturi!=null&&requesturi.indexOf("account_bank_return.html")!=-1){
				filterchain.doFilter(servletrequest, servletresponse);
				return;
			}
			if(requesturi!=null&&requesturi.indexOf("/alipay/activity.html")!=-1){
				filterchain.doFilter(servletrequest, servletresponse);
				return ;
			}
			if(requesturi!=null&&requesturi.indexOf("/alipayLogin.html")!=-1){
				filterchain.doFilter(servletrequest, servletresponse);
				return ;
			}
			RequestWrapper rw = new RequestWrapper(httpServletRequest);
			String param = httpServletRequest.getQueryString();
			if(!"".equals(param) && param != null) {
				param = URLDecoder.decode(param, "UTF-8");
				String originalurl = requesturi + param;

				String sqlParam = param;
				//添加sql注入的判断
				if(requesturi.endsWith("/askQuestion.html") || requesturi.endsWith("/member/answer.html")){
					sqlParam = rw.cleanSQLInject(param);
				}

				String xssParam = rw.cleanXSS(sqlParam);
				requesturi += "?"+xssParam;

				if(!xssParam.equals(param)){
					System.out.println("requesturi::::::"+requesturi);
					httpServletResponse.sendRedirect(requesturi);
					System.out.println("no entered.");
//					filterchain.doFilter(new RequestWrapper((HttpServletRequest) servletrequest), servletresponse);
					return ;
				}
			}
			filterchain.doFilter(servletrequest, servletresponse);
		}else{

			//对请求中的所有东西都做校验，包括表单。此功能校验比较严格容易屏蔽表单正常输入，使用此功能请注意。
			filterchain.doFilter(new RequestWrapper((HttpServletRequest) servletrequest), servletresponse);
		}
	}
requestMapping: 

public RequestWrapper(){
		super(null);
	}

	public RequestWrapper(HttpServletRequest httpservletrequest) {
		super(httpservletrequest);
	}

	public String[] getParameterValues(String s) {
		String str[] = super.getParameterValues(s);
		if (str == null) {
			return null;
		}
		int i = str.length;
		String as1[] = new String[i];
		for (int j = 0; j < i; j++) {
			as1[j] = cleanXSS(cleanSQLInject(str[j]));
		}

		return as1;
	}

	public String getParameter(String s) {
		String s1 = super.getParameter(s);
		if (s1 == null) {
			return null;
		} else {
			return cleanXSS(cleanSQLInject(s1));
		}
	}

	public String getHeader(String s) {
		String s1 = super.getHeader(s);
		if (s1 == null) {
			return null;
		} else {
			return cleanXSS(cleanSQLInject(s1));
		}
	}

	public String cleanXSS(String src) {
		String temp =src;

		System.out.println("xss---temp-->"+src);
    src = src.replaceAll("<", "<").replaceAll(">", ">");
    // if (src.indexOf("address")==-1)
	//	{
     src = src.replaceAll("\\(", "(").replaceAll("\\)", ")");
		//}

    src = src.replaceAll("'", "'");

    Pattern pattern=Pattern.compile("(eval\\((.*)\\)|script)",Pattern.CASE_INSENSITIVE);
	  Matcher matcher=pattern.matcher(src);
	  src = matcher.replaceAll("");

	  pattern=Pattern.compile("[\\\"\\'][\\s]*javascript:(.*)[\\\"\\']",Pattern.CASE_INSENSITIVE);
	  matcher=pattern.matcher(src);
	  src = matcher.replaceAll("\"\"");

	  //增加脚本
	  src = src.replaceAll("script", "").replaceAll(";", "")
	  	.replaceAll("\"", "").replaceAll("@", "")
	  	.replaceAll("0x0d", "")
	  	.replaceAll("0x0a", "").replaceAll(",", "");

		if(!temp.equals(src)){
			System.out.println("输入信息存在xss攻击！");
			System.out.println("原始输入信息-->"+temp);
			System.out.println("处理后信息-->"+src);
		}
		return src;
	}

	//需要增加通配，过滤大小写组合
	public String cleanSQLInject(String src) {
		String temp =src;
    src = src.replaceAll("insert", "forbidI")
    	.replaceAll("select", "forbidS")
    	.replaceAll("update", "forbidU")
    	.replaceAll("delete", "forbidD")
    	.replaceAll("and", "forbidA")
    	.replaceAll("or", "forbidO");

		if(!temp.equals(src)){
			System.out.println("输入信息存在SQL攻击！");
			System.out.println("原始输入信息-->"+temp);
			System.out.println("处理后信息-->"+src);
		}
		return src;
	}

xml配置：

<filter>
		<filter-name>XssFilter</filter-name>
		<filter-class>cn.com.jsoft.xss.XSSFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>XssFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

以上代码仅仅将特殊的sql字符，特殊script脚本字符处理掉，具体的页面处理还需要后台处理！！

关于这篇java 过滤器filter防sql注入的实现代码就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持我们。