设置常用过滤器-站点黑名单、内容压缩
2014-04-30 08:58
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设置站点黑名单的过滤器
为了简单起见，设置禁用站点时，暂不支持使用通配符。只是抛砖引玉了。
比如：禁止其他的网站引用本站的图片资源，只需在此基础上稍作修改即可。
功能描述
不允许从禁用的站点（IP）访问当前应用，也不允许从禁用的站点链接到当前应用。为了简单起见，设置禁用站点时，暂不支持使用通配符。只是抛砖引玉了。
比如：禁止其他的网站引用本站的图片资源，只需在此基础上稍作修改即可。
使用方法
在 java web 项目的 web.xml 文件中添加如下代码。<!--设置站点黑名单的过滤器配置 开始 --> <filter> <filter-name>BannedAccessFilter</filter-name> <filter-class>com.hmw.filter.BannedAccessFilter</filter-class> <init-param> <description>需要禁用的站点，一个站点占用一行</description> <param-name>bannedSites</param-name> <param-value> 192.168.1.101 192.168.1.102 www.csdn.net </param-value> </init-param> </filter> <filter-mapping> <filter-name>BannedAccessFilter</filter-name> <url-pattern>／*</url-pattern> </filter-mapping> <!--设置站点黑名单的过滤器配置 结束 -->
过滤器源码
package com.hmw.filter;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashSet;
import java.util.StringTokenizer;
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 org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
/**
* 设置禁用站点（黑名单）的过滤器
*/
public class BannedAccessFilter implements Filter {
static final Logger logger = Logger.getLogger(BannedAccessFilter.class);
private HashSet bannedSiteTable;
/**
* 将配置的禁用站点列表初始化到一个 HashSet 中
*/
@Override
public void init(FilterConfig config) throws ServletException {
bannedSiteTable = new HashSet();
String bannedSites = config.getInitParameter("bannedSites");
// Default token set: white space.
StringTokenizer tok = new StringTokenizer(bannedSites);
while (tok.hasMoreTokens()) {
String bannedSite = tok.nextToken();
bannedSiteTable.add(bannedSite);
logger.info("Banned " + bannedSite);
}
}
/**
* 如果请求来自被禁用的站点，或是从被禁用的站点链接过来的，则拒绝访问。
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
logger.debug("BannedAccessFilter: Filtering the Request...");
HttpServletRequest req = (HttpServletRequest) request;
String requestingHost = req.getRemoteHost();
String referringHost = getReferringHost(req.getHeader("Referer"));
String bannedSite = null;
boolean isBanned = false;
if (bannedSiteTable.contains(requestingHost)) {
bannedSite = requestingHost;
isBanned = true;
} else if (bannedSiteTable.contains(referringHost)) {
bannedSite = referringHost;
isBanned = true;
}
if (isBanned) {
showWarning(response, bannedSite);
} else {
chain.doFilter(request, response);
}
logger.debug("BannedAccessFilter: Filtering the Response...");
}
@Override
public void destroy() {
}
/**
* 根据 URL 链接地址，取得该链接地址所在的站点
* @param refererringURLString URL链接地址
* @return 该 URL 链接地址所在的站点，如果传入的参数不是一个符合URL规范的字符串，则返回 <CODE>null</CODE>
*/
private String getReferringHost(String refererringURLString) {
if(StringUtils.isBlank(refererringURLString))
return null;
try {
URL referringURL = new URL(refererringURLString);
return referringURL.getHost();
} catch (MalformedURLException mue) { // Malformed
return null;
}
}
/**
* 如果用户是从禁用站点访问的该应用，或是从禁用站点链接过来的，则调用此方法将警告信息展现给用户。
* @param response HTTP请求响应对象
* @param bannedSite 禁止的站点
* @throws ServletException
* @throws IOException
* @author <A href="mailto:hemw@mochasoft.com.cn">何明旺</A>
*/
private void showWarning(ServletResponse response, String bannedSite) throws ServletException, IOException {
String htmlCode = "";
htmlCode += "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">";
htmlCode += "<html xmlns=\"http://www.w3.org/1999/xhtml\">";
htmlCode += " <head>";
htmlCode += " <meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />";
htmlCode += " <title>禁止访问</title>";
htmlCode += " </head>";
htmlCode += " <body>";
htmlCode += " <h1>禁止访问</h1>";
htmlCode += " <p>对不起，您无法访问该资源，因为您的站点已经被列入我们的黑名单！</p>";
htmlCode += " <p>您的站点是：<strong>" + bannedSite + "</strong></p>";
htmlCode += " </body>";
htmlCode += "</html>";
response.setContentType("text/html");
PrintWriter out = null;
try{
out = response.getWriter();
out.println(htmlCode);
}finally{
if(out != null){
out.flush();
out.close();
}
}
/*
* 也可以使用下面的方法直接转发或重定向到指定的警告页面
* 转发：
* ((HttpServletRequest)request).getRequestDispatcher("/warn.html").forward(request, response);
* 重定向：
* ((HttpServletResponse)response).sendRedirect("webAppContext/warn.html");
*/
}
}将响应数据进行压缩处理的过滤器
功能描述
如果浏览器支持 gzip 压缩格式的数据，则将响应的数据使用 gzip 压缩后再输出。使用方法
在 java web 项目的 web.xml 文件中添加如下代码。<!--压缩过滤器的配置 开始 --> <filter> <filter-name>CompressionFilter</filter-name> <filter-class>com.hmw.filter.CompressionFilter</filter-class> </filter> <filter-mapping> <filter-name>CompressionFilter</filter-name> <servlet-name>/LongServlet</servlet-name> </filter-mapping> <!--压缩过滤器的配置 结束 -->
过滤器源码
CompressionFilter.java
?package com.hmw.filter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.zip.GZIPOutputStream;
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 javax.servlet.http.HttpServletResponse;
/**
* 压缩过滤器 <BR>
* 如果浏览器支持 gzip 压缩格式的数据，则将响应的数据使用 gzip 压缩后再输出。
* */
public class CompressionFilter implements Filter {
@Override
public void init(FilterConfig config) throws ServletException {
}
/**
* 如果浏览器不支持 gzip 压缩，则不做直接放行（不做压缩处理）<BR>
* 反之，将HTTP响应头的编码设置为 <CODE>gzip</CODE>，然后将响应数据使用 gzip 进行压缩处理。
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws ServletException, IOException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
if (!isGzipSupported(req)) { // Invoke resource normally.
chain.doFilter(req, res);
return;
}
// 将响应头信息中的内容编码设置为 gzip
res.setHeader("Content-Encoding", "gzip");
// 调用资源，使用 CharArrayWrapper 包装输出
CharArrayWrapper responseWrapper = new CharArrayWrapper(res);
chain.doFilter(req, responseWrapper);
// 取得存放输出数据的 char 型数组
char[] responseChars = responseWrapper.toCharArray();
// 将响应数据压缩后存入一个 byte 型的数组，然后输出到
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
GZIPOutputStream zipOut = new GZIPOutputStream(byteStream);
OutputStreamWriter tempOut = new OutputStreamWriter(zipOut);
// 将原来的响应数据压缩后写入二字节输出流
tempOut.write(responseChars);
// 关闭输出流
tempOut.close();
// 更新响应头信息中 Content-Length 的值。
res.setContentLength(byteStream.size());
// 将压缩后的数据发送至客户端
OutputStream realOut = res.getOutputStream();
byteStream.writeTo(realOut);
}
@Override
public void destroy() {
}
/**
* 检测浏览器是否支持 Gzip 压缩
*
* @param req HTTP 请求对象
* @return 如果浏览器支持 Gzip 压缩，则返回 true，反之，则返回 false
*/
private boolean isGzipSupported(HttpServletRequest req) {
String browserEncodings = req.getHeader("Accept-Encoding");
return ((browserEncodings != null) && (browserEncodings.indexOf("gzip") != -1));
}
}
CharArrayWrapper.java
?package com.hmw.filter;
import java.io.CharArrayWriter;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
/**
* A response wrapper that takes everything the client would normally output and
* saves it in one big character array.
*/
public class CharArrayWrapper extends HttpServletResponseWrapper {
private CharArrayWriter charWriter;
/**
* Initializes wrapper.
* <P>
* First, this constructor calls the parent constructor. That call is
* crucial so that the response is stored and thus setHeader, *setStatus,
* addCookie, and so forth work normally.
* <P>
* Second, this constructor creates a CharArrayWriter that will be used to
* accumulate the response.
*/
public CharArrayWrapper(HttpServletResponse response) {
super(response);
charWriter = new CharArrayWriter();
}
/**
* When servlets or JSP pages ask for the Writer, don't give them the real
* one. Instead, give them a version that writes into the character array.
* The filter needs to send the contents of the array to the client (perhaps
* after modifying it).
*/
@Override
public PrintWriter getWriter() {
return new PrintWriter(charWriter);
}
/**
* Get a String representation of the entire buffer.
* <P>
* Be sure <B>not</B> to call this method multiple times on the same
* wrapper. The API for CharArrayWriter does not guarantee that it
* "remembers" the previous value, so the call is likely to make a new
* String every time.
*/
@Override
public String toString() {
return charWriter.toString();
}
/** Get the underlying character array. */
public char[] toCharArray() {
return charWriter.toCharArray();
}
}替换禁用语（指定关键字）
功能描述
将请求响应中所有的禁用关键字替换掉之后再输出。使用方法
在 java web 项目的 web.xml 文件中添加如下代码。<!--替换关键字的过滤器配置 开始 --> <filter> <filter-name>StopWordsFilter</filter-name> <filter-class>com.hmw.filter.StopWordsFilter</filter-class> <init-param> <description>需要禁用的关键字，一个关键字占一行</description> <param-name>keys</param-name> <param-value> QQ 百度 七一五 </param-value> </init-param> </filter> <filter-mapping> <filter-name>StopWordsFilter</filter-name> <servlet-name>*.jsp</servlet-name> </filter-mapping> <!--替换关键字的过滤器 结束 -->
过滤器源码
ReplaceKeyWordFilter.java
?package com.hmw.filter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.StringTokenizer;
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.HttpServletResponse;
/**
* 替换关键字的滤器 <BR>
* */
public class StopWordsFilter implements Filter {
private Set keyWords = new HashSet();
/**
* 将需要进行替换的关键字添加到一个定义好的 Set 中
*/
@Override
public void init(FilterConfig config) throws ServletException {
String keys = config.getInitParameter("keys");
StringTokenizer tokenizer = new StringTokenizer(keys);
String token = null;
while (tokenizer.hasMoreTokens()) {
token = tokenizer.nextToken();
if(token != null && token.length() > 0){
keyWords.add(tokenizer.nextToken());
}
}
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws ServletException, IOException {
CharArrayWrapper responseWrapper = new CharArrayWrapper(
(HttpServletResponse) response);
// 调用请求资源（使用自己包装的 responseWrapper）
chain.doFilter(request, responseWrapper);
// 取得响应字符串
String responseString = responseWrapper.toString();
// 将需要替换的关键字用“**”替换掉
Iterator iter = keyWords.iterator();
while (iter.hasNext()) {
responseString = replace(responseString, iter.next(), "**");
}
// 修改响应头信息中的 Content-Length
response.setContentLength(responseString.length());
PrintWriter out = response.getWriter();
out.write(responseString);
}
@Override
public void destroy() {
}
/**
* 将字符串中的所有的指定子字符串替换掉
* @param mainString 需要进行替换的字符串
* @param orig 需要被替换的子串
* @param replacement 替换后的新串
* @return 返回替换后的字符串
*/
public static String replace(String mainString, String orig, String replacement) {
String result = "";
int oldIndex = 0;
int index = 0;
int origLength = orig.length();
while ((index = mainString.indexOf(orig, oldIndex)) != -1) {
result = result + mainString.substring(oldIndex, index) + replacement;
oldIndex = index + origLength;
}
result = result + mainString.substring(oldIndex);
return result;
}
}
CharArrayWrapper.java
?package com.hmw.filter;
import java.io.CharArrayWriter;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
/**
* A response wrapper that takes everything the client would normally output and
* saves it in one big character array.
*/
public class CharArrayWrapper extends HttpServletResponseWrapper {
private CharArrayWriter charWriter;
/**
* Initializes wrapper.
* <P>
* First, this constructor calls the parent constructor. That call is
* crucial so that the response is stored and thus setHeader, *setStatus,
* addCookie, and so forth work normally.
* <P>
* Second, this constructor creates a CharArrayWriter that will be used to
* accumulate the response.
*/
public CharArrayWrapper(HttpServletResponse response) {
super(response);
charWriter = new CharArrayWriter();
}
/**
* When servlets or JSP pages ask for the Writer, don't give them the real
* one. Instead, give them a version that writes into the character array.
* The filter needs to send the contents of the array to the client (perhaps
* after modifying it).
*/
@Override
public PrintWriter getWriter() {
return new PrintWriter(charWriter);
}
/**
* Get a String representation of the entire buffer.
* <P>
* Be sure <B>not</B> to call this method multiple times on the same
* wrapper. The API for CharArrayWriter does not guarantee that it
* "remembers" the previous value, so the call is likely to make a new
* String every time.
*/
@Override
public String toString() {
return charWriter.toString();
}
/** Get the underlying character array. */
public char[] toCharArray() {
return charWriter.toCharArray();
}
}
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