XSS过滤JAVA过滤器filter 防止常见SQL注入详解编程语言

简单介绍：

XSS : 跨站脚本攻击(Cross Site Scripting)，为不和层叠样式表(Cascading Style Sheets, CSS)的缩写混淆，故将跨站脚本攻击缩写为XSS。恶意攻击者往Web页面里插入恶意html代码，当用户浏览该页之时，嵌入其中Web里面的html代码会被执行，从而达到恶意攻击用户的特殊目的。

sql注入
所谓SQL注入，就是通过把SQL命令插入到Web表单提交或输入域名或页面请求的查询字符串，最终达到欺骗服务器执行恶意的SQL命令。具体来说，它是利用现有应用程序，将（恶意）的SQL命令注入到后台数据库引擎执行的能力，它可以通过在Web表单中输入（恶意）SQL语句得到一个存在安全漏洞的网站上的数据库，而不是按照设计者意图去执行SQL语句。

实现方式，共三步：

第一步：配置web.xml

 filter 

 filter-name xssFilter /filter-name 

 filter-class com.wfcm.xss.XssFilter /filter-class 

 /filter 

 filter-mapping 

 filter-name xssFilter /filter-name 

 url-pattern /* /url-pattern 

 /filter-mapping 

第二步：过滤工具类

1.XSSFilter.java

package com.wfcm.xss; 

import javax.servlet.*; 

import javax.servlet.http.HttpServletRequest; 

import java.io.IOException; 


 * @author xlf 

 * @email [email protected] 

 * @date 2017年4月19日 上午10:41:42 

public class XssFilter implements Filter { 

 @Override 

 public void init(FilterConfig config) throws ServletException { 

 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() { 

}

View Code

2.XssHttpServletRequestWrapper

package com.wfcm.xss; 

import org.apache.commons.lang.StringEscapeUtils; 

import org.apache.commons.lang.StringUtils; 

import javax.servlet.http.HttpServletRequest; 

import javax.servlet.http.HttpServletRequestWrapper; 

import java.util.LinkedHashMap; 

import java.util.Map; 

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper { 

 // 没被包装过的HttpServletRequest（特殊场景，需求自己过滤） 

 HttpServletRequest orgRequest; 

 // html过滤 

 private final static HTMLFilter htmlFilter = new HTMLFilter(); 

 public XssHttpServletRequestWrapper(HttpServletRequest request) { 

 super(request); 

 orgRequest = request; 

 @Override 

 public String getParameter(String name) { 

 String value = super.getParameter(xssEncode(name)); 

 if (StringUtils.isNotBlank(value)) { 

 value =xssEncode(value); 

 //SQL注入检查 

// value = SQLFilter.sqlInject(value); 

 value = SQLFilter.sqlInject(value); 

 return StringEscapeUtils.unescapeHtml(value); 

 @Override 

 public String[] getParameterValues(String name) { 

 String[] parameters = super.getParameterValues(name); 

 if (parameters == null || parameters.length == 0) { 

 return null; 

 for (int i = 0; i parameters.length; i++) { 

 parameters[i] = xssEncode(parameters[i]); 

 //SQL注入检查 

// parameters[i] = SQLFilter.sqlInject(parameters[i]); 

 parameters[i] = SQLFilter.sqlInject(parameters[i]); 

 parameters[i] = StringEscapeUtils.unescapeHtml(parameters[i]); 

 return parameters; 

 @Override 

 public Map String, String[] getParameterMap() { 

 Map String, String[] map = new LinkedHashMap (); 

 Map String, String[] parameters = super.getParameterMap(); 

 for (String key : parameters.keySet()) { 

 String[] values = parameters.get(key); 

 for (int i = 0; i values.length; i++) { 

 values[i] = xssEncode(values[i]); 

 //SQL注入检查 

// values[i] = SQLFilter.sqlInject(values[i]); 

 values[i] = SQLFilter.sqlInject(values[i]); 

 values[i] = StringEscapeUtils.unescapeHtml(values[i]); 

 map.put(key, values); 

 return map; 

 @Override 

 public String getHeader(String name) { 

 String value = super.getHeader(xssEncode(name)); 

 if (StringUtils.isNotBlank(value)) { 

 value = xssEncode(value); 

 //SQL注入检查 

// value = SQLFilter.sqlInject(value); 

 value = SQLFilter.sqlInject(value); 

 return StringEscapeUtils.unescapeHtml(value); 

 private String xssEncode(String input) { 

 return htmlFilter.filter(input); 

 /** 

 * 获取最原始的request 

 public HttpServletRequest getOrgRequest() { 

 return orgRequest; 

 /** 

 * 获取最原始的request 

 public static HttpServletRequest getOrgRequest(HttpServletRequest request) { 

 if (request instanceof XssHttpServletRequestWrapper) { 

 return ((XssHttpServletRequestWrapper) request).getOrgRequest(); 

 return request; 

}

View Code

3.HTMLFilter

package com.wfcm.xss; 

import java.util.ArrayList; 

import java.util.Collections; 

import java.util.HashMap; 

import java.util.List; 

import java.util.Map; 

import java.util.concurrent.ConcurrentHashMap; 

import java.util.concurrent.ConcurrentMap; 

import java.util.logging.Logger; 

import java.util.regex.Matcher; 

import java.util.regex.Pattern; 

* HTML filtering utility for protecting against XSS (Cross Site Scripting). 

* This code is licensed LGPLv3 

* This code is a Java port of the original work in PHP by Cal Hendersen. 

* http://code.iamcal.com/php/lib_filter/ 

* The trickiest part of the translation was handling the differences in regex handling 

* between PHP and Java. These resources were helpful in the process: 

* http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html 

* http://us2.php.net/manual/en/reference.pcre.pattern.modifiers.php 

* http://www.regular-expressions.info/modifiers.html 

* A note on naming conventions: instance variables are prefixed with a "v"; global 

* constants are in all caps. 

* Sample use: 

* String input = ... 

* String clean = new HTMLFilter().filter( input ); 

* The class is not thread safe. Create a new instance if in doubt. 

* If you find bugs or have suggestions on improvement (especially regarding 

* performance), please contact us. The latest version of this 

* source, and our contact details, can be found at http://xss-html-filter.sf.net 

* @author Joseph OConnell 

* @author Cal Hendersen 

* @author Michael Semb Wever 

public class HTMLFilter { 

 /** regex flag union representing /si modifiers in php **/ 

 private static final int REGEX_FLAGS_SI = Pattern.CASE_INSENSITIVE | Pattern.DOTALL; 

 private static final Pattern P_COMMENTS = Pattern.compile(" !--(.*?)-- ", Pattern.DOTALL); 

 private static final Pattern P_COMMENT = Pattern.compile("^!--(.*)--$", REGEX_FLAGS_SI); 

 private static final Pattern P_TAGS = Pattern.compile(" (.*?) ", Pattern.DOTALL); 

 private static final Pattern P_END_TAG = Pattern.compile("^/([a-z0-9]+)", REGEX_FLAGS_SI); 

 private static final Pattern P_START_TAG = Pattern.compile("^([a-z0-9]+)(.*?)(/?)$", REGEX_FLAGS_SI); 

 private static final Pattern P_QUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)=([/"])(.*?)//2", REGEX_FLAGS_SI); 

 private static final Pattern P_UNQUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)(=)([^/"//s]+)", REGEX_FLAGS_SI); 

 private static final Pattern P_PROTOCOL = Pattern.compile("^([^:]+):", REGEX_FLAGS_SI); 

 private static final Pattern P_ENTITY = Pattern.compile(" #(//d+);?"); 

 private static final Pattern P_ENTITY_UNICODE = Pattern.compile(" #x([0-9a-f]+);?"); 

 private static final Pattern P_ENCODE = Pattern.compile("%([0-9a-f]{2});?"); 

 private static final Pattern P_VALID_ENTITIES = Pattern.compile(" ([^ ]*)(?=(;| |$))"); 

 private static final Pattern P_VALID_QUOTES = Pattern.compile("( |^)([^ ]+?)( |$)", Pattern.DOTALL); 

 private static final Pattern P_END_ARROW = Pattern.compile("^ "); 

 private static final Pattern P_BODY_TO_END = Pattern.compile(" ([^ ]*?)(?= |$)"); 

 private static final Pattern P_XML_CONTENT = Pattern.compile("(^| )([^ ]*?)(?= )"); 

 private static final Pattern P_STRAY_LEFT_ARROW = Pattern.compile(" ([^ ]*?)(?= |$)"); 

 private static final Pattern P_STRAY_RIGHT_ARROW = Pattern.compile("(^| )([^ ]*?)(?= )"); 

 private static final Pattern P_AMP = Pattern.compile(" "); 

 private static final Pattern P_QUOTE = Pattern.compile("/""); 

 private static final Pattern P_LEFT_ARROW = Pattern.compile(" "); 

 private static final Pattern P_RIGHT_ARROW = Pattern.compile(" "); 

 private static final Pattern P_BOTH_ARROWS = Pattern.compile(" "); 

 private static final Pattern P_DOUBLE_QUOT = Pattern.compile(" quot;"); 

 // @xxx could grow large... maybe use sesats ReferenceMap 

 private static final ConcurrentMap String,Pattern P_REMOVE_PAIR_BLANKS = new ConcurrentHashMap String, Pattern (); 

 private static final ConcurrentMap String,Pattern P_REMOVE_SELF_BLANKS = new ConcurrentHashMap String, Pattern (); 

 /** set of allowed html elements, along with allowed attributes for each element **/ 

 private final Map String, List String vAllowed; 

 /** counts of open tags for each (allowable) html element **/ 

 private final Map String, Integer vTagCounts = new HashMap String, Integer (); 

 /** html elements which must always be self-closing (e.g. " img / ") **/ 

 private final String[] vSelfClosingTags; 

 /** html elements which must always have separate opening and closing tags (e.g. " b /b ") **/ 

 private final String[] vNeedClosingTags; 

 /** set of disallowed html elements **/ 

 private final String[] vDisallowed; 

 /** attributes which should be checked for valid protocols **/ 

 private final String[] vProtocolAtts; 

 /** allowed protocols **/ 

 private final String[] vAllowedProtocols; 

 /** tags which should be removed if they contain no content (e.g. " b /b " or " b / ") **/ 

 private final String[] vRemoveBlanks; 

 /** entities allowed within html markup **/ 

 private final String[] vAllowedEntities; 

 /** flag determining whether comments are allowed in input String. */ 

 private final boolean stripComment; 

 private final boolean encodeQuotes; 

 private boolean vDebug = false; 

 /** 

 * flag determining whether to try to make tags when presented with "unbalanced" 

 * angle brackets (e.g. " b text /b " becomes " b text /b "). If set to false, 

 * unbalanced angle brackets will be html escaped. 

 private final boolean alwaysMakeTags; 

 /** Default constructor. 

 public HTMLFilter() { 

 vAllowed = new HashMap (); 

 final ArrayList String a_atts = new ArrayList String (); 

 a_atts.add("href"); 

 a_atts.add("target"); 

 vAllowed.put("a", a_atts); 

 final ArrayList String img_atts = new ArrayList String (); 

 img_atts.add("src"); 

 img_atts.add("width"); 

 img_atts.add("height"); 

 img_atts.add("alt"); 

 vAllowed.put("img", img_atts); 

 final ArrayList String no_atts = new ArrayList String (); 

 vAllowed.put("b", no_atts); 

 vAllowed.put("strong", no_atts); 

 vAllowed.put("i", no_atts); 

 vAllowed.put("em", no_atts); 

 vSelfClosingTags = new String[]{"img"}; 

 vNeedClosingTags = new String[]{"a", "b", "strong", "i", "em"}; 

 vDisallowed = new String[]{}; 

 vAllowedProtocols = new String[]{"http", "mailto", "https"}; // no ftp. 

 vProtocolAtts = new String[]{"src", "href"}; 

 vRemoveBlanks = new String[]{"a", "b", "strong", "i", "em"}; 

 vAllowedEntities = new String[]{"amp", "gt", "lt", "quot"}; 

 stripComment = true; 

 encodeQuotes = true; 

 alwaysMakeTags = true; 

 /** Set debug flag to true. Otherwise use default settings. See the default constructor. 

 * @param debug turn debug on with a true argument 

 public HTMLFilter(final boolean debug) { 

 this(); 

 vDebug = debug; 

 /** Map-parameter configurable constructor. 

 * @param conf map containing configuration. keys match field names. 

 public HTMLFilter(final Map String,Object conf) { 

 assert conf.containsKey("vAllowed") : "configuration requires vAllowed"; 

 assert conf.containsKey("vSelfClosingTags") : "configuration requires vSelfClosingTags"; 

 assert conf.containsKey("vNeedClosingTags") : "configuration requires vNeedClosingTags"; 

 assert conf.containsKey("vDisallowed") : "configuration requires vDisallowed"; 

 assert conf.containsKey("vAllowedProtocols") : "configuration requires vAllowedProtocols"; 

 assert conf.containsKey("vProtocolAtts") : "configuration requires vProtocolAtts"; 

 assert conf.containsKey("vRemoveBlanks") : "configuration requires vRemoveBlanks"; 

 assert conf.containsKey("vAllowedEntities") : "configuration requires vAllowedEntities"; 

 vAllowed = Collections.unmodifiableMap((HashMap String, List String ) conf.get("vAllowed")); 

 vSelfClosingTags = (String[]) conf.get("vSelfClosingTags"); 

 vNeedClosingTags = (String[]) conf.get("vNeedClosingTags"); 

 vDisallowed = (String[]) conf.get("vDisallowed"); 

 vAllowedProtocols = (String[]) conf.get("vAllowedProtocols"); 

 vProtocolAtts = (String[]) conf.get("vProtocolAtts"); 

 vRemoveBlanks = (String[]) conf.get("vRemoveBlanks"); 

 vAllowedEntities = (String[]) conf.get("vAllowedEntities"); 

 stripComment = conf.containsKey("stripComment") ? (Boolean) conf.get("stripComment") : true; 

 encodeQuotes = conf.containsKey("encodeQuotes") ? (Boolean) conf.get("encodeQuotes") : true; 

 alwaysMakeTags = conf.containsKey("alwaysMakeTags") ? (Boolean) conf.get("alwaysMakeTags") : true; 

 private void reset() { 

 vTagCounts.clear(); 

 private void debug(final String msg) { 

 if (vDebug) { 

 Logger.getAnonymousLogger().info(msg); 

 //--------------------------------------------------------------- 

 // my versions of some PHP library functions 

 public static String chr(final int decimal) { 

 return String.valueOf((char) decimal); 

 public static String htmlSpecialChars(final String s) { 

 String result = s; 

 result = regexReplace(P_AMP, " amp;", result); 

 result = regexReplace(P_QUOTE, " quot;", result); 

 result = regexReplace(P_LEFT_ARROW, " ", result); 

 result = regexReplace(P_RIGHT_ARROW, " ", result); 

 return result; 

 //--------------------------------------------------------------- 

 /** 

 * given a user submitted input String, filter out any invalid or restricted 

 * html. 

 * @param input text (i.e. submitted by a user) than may contain html 

 * @return "clean" version of input, with only valid, whitelisted html elements allowed 

 public String filter(final String input) { 

 reset(); 

 String s = input; 

 debug("************************************************"); 

 debug(" INPUT: " + input); 

 s = escapeComments(s); 

 debug(" escapeComments: " + s); 

 s = balanceHTML(s); 

 debug(" balanceHTML: " + s); 

 s = checkTags(s); 

 debug(" checkTags: " + s); 

 s = processRemoveBlanks(s); 

 debug("processRemoveBlanks: " + s); 

 s = validateEntities(s); 

 debug(" validateEntites: " + s); 

 debug("************************************************/n/n"); 

 return s; 

 public boolean isAlwaysMakeTags(){ 

 return alwaysMakeTags; 

 public boolean isStripComments(){ 

 return stripComment; 

 private String escapeComments(final String s) { 

 final Matcher m = P_COMMENTS.matcher(s); 

 final StringBuffer buf = new StringBuffer(); 

 if (m.find()) { 

 final String match = m.group(1); //(.*?) 

 m.appendReplacement(buf, Matcher.quoteReplacement(" !--" + htmlSpecialChars(match) + "-- ")); 

 m.appendTail(buf); 

 return buf.toString(); 

 private String balanceHTML(String s) { 

 if (alwaysMakeTags) { 

 // try and form html 

 s = regexReplace(P_END_ARROW, "", s); 

 s = regexReplace(P_BODY_TO_END, " $1 ", s); 

 s = regexReplace(P_XML_CONTENT, "$1 $2", s); 

 } else { 

 // escape stray brackets 

 s = regexReplace(P_STRAY_LEFT_ARROW, " $1", s); 

 s = regexReplace(P_STRAY_RIGHT_ARROW, "$1$2 ", s); 

 // the last regexp causes   entities to appear 

 // (we need to do a lookahead assertion so that the last bracket can 

 // be used in the next pass of the regexp) 

 s = regexReplace(P_BOTH_ARROWS, "", s); 

 return s; 

 private String checkTags(String s) { 

 Matcher m = P_TAGS.matcher(s); 

 final StringBuffer buf = new StringBuffer(); 

 while (m.find()) { 

 String replaceStr = m.group(1); 

 replaceStr = processTag(replaceStr); 

 m.appendReplacement(buf, Matcher.quoteReplacement(replaceStr)); 

 m.appendTail(buf); 

 s = buf.toString(); 

 // these get tallied in processTag 

 // (remember to reset before subsequent calls to filter method) 

 for (String key : vTagCounts.keySet()) { 

 for (int ii = 0; ii vTagCounts.get(key); ii++) { 

 s += " /" + key + " "; 

 return s; 

 private String processRemoveBlanks(final String s) { 

 String result = s; 

 for (String tag : vRemoveBlanks) { 

 if(!P_REMOVE_PAIR_BLANKS.containsKey(tag)){ 

 P_REMOVE_PAIR_BLANKS.putIfAbsent(tag, Pattern.compile(" " + tag + "(//s[^ ]*)? /" + tag + " ")); 

 result = regexReplace(P_REMOVE_PAIR_BLANKS.get(tag), "", result); 

 if(!P_REMOVE_SELF_BLANKS.containsKey(tag)){ 

 P_REMOVE_SELF_BLANKS.putIfAbsent(tag, Pattern.compile(" " + tag + "(//s[^ ]*)?/ ")); 

 result = regexReplace(P_REMOVE_SELF_BLANKS.get(tag), "", result); 

 return result; 

 private static String regexReplace(final Pattern regex_pattern, final String replacement, final String s) { 

 Matcher m = regex_pattern.matcher(s); 

 return m.replaceAll(replacement); 

 private String processTag(final String s) { 

 // ending tags 

 Matcher m = P_END_TAG.matcher(s); 

 if (m.find()) { 

 final String name = m.group(1).toLowerCase(); 

 if (allowed(name)) { 

 if (!inArray(name, vSelfClosingTags)) { 

 if (vTagCounts.containsKey(name)) { 

 vTagCounts.put(name, vTagCounts.get(name) - 1); 

 return " /" + name + " "; 

 // starting tags 

 m = P_START_TAG.matcher(s); 

 if (m.find()) { 

 final String name = m.group(1).toLowerCase(); 

 final String body = m.group(2); 

 String ending = m.group(3); 

 //debug( "in a starting tag, name=" + name + "; body=" + body + "; ending=" + ending + "" ); 

 if (allowed(name)) { 

 String params = ""; 

 final Matcher m2 = P_QUOTED_ATTRIBUTES.matcher(body); 

 final Matcher m3 = P_UNQUOTED_ATTRIBUTES.matcher(body); 

 final List String paramNames = new ArrayList String (); 

 final List String paramValues = new ArrayList String (); 

 while (m2.find()) { 

 paramNames.add(m2.group(1)); //([a-z0-9]+) 

 paramValues.add(m2.group(3)); //(.*?) 

 while (m3.find()) { 

 paramNames.add(m3.group(1)); //([a-z0-9]+) 

 paramValues.add(m3.group(3)); //([^/"//s]+) 

 String paramName, paramValue; 

 for (int ii = 0; ii paramNames.size(); ii++) { 

 paramName = paramNames.get(ii).toLowerCase(); 

 paramValue = paramValues.get(ii); 

// debug( "paramName=" + paramName + "" ); 

// debug( "paramValue=" + paramValue + "" ); 

// debug( "allowed? " + vAllowed.get( name ).contains( paramName ) ); 

 if (allowedAttribute(name, paramName)) { 

 if (inArray(paramName, vProtocolAtts)) { 

 paramValue = processParamProtocol(paramValue); 

 params += " " + paramName + "=/"" + paramValue + "/""; 

 if (inArray(name, vSelfClosingTags)) { 

 ending = " /"; 

 if (inArray(name, vNeedClosingTags)) { 

 ending = ""; 

 if (ending == null || ending.length() 1) { 

 if (vTagCounts.containsKey(name)) { 

 vTagCounts.put(name, vTagCounts.get(name) + 1); 

 } else { 

 vTagCounts.put(name, 1); 

 } else { 

 ending = " /"; 

 return " " + name + params + ending + " "; 

 } else { 

 return ""; 

 // comments 

 m = P_COMMENT.matcher(s); 

 if (!stripComment m.find()) { 

 return " " + m.group() + " "; 

 return ""; 

 private String processParamProtocol(String s) { 

 s = decodeEntities(s); 

 final Matcher m = P_PROTOCOL.matcher(s); 

 if (m.find()) { 

 final String protocol = m.group(1); 

 if (!inArray(protocol, vAllowedProtocols)) { 

 // bad protocol, turn into local anchor link instead 

 s = "#" + s.substring(protocol.length() + 1, s.length()); 

 if (s.startsWith("#//")) { 

 s = "#" + s.substring(3, s.length()); 

 return s; 

 private String decodeEntities(String s) { 

 StringBuffer buf = new StringBuffer(); 

 Matcher m = P_ENTITY.matcher(s); 

 while (m.find()) { 

 final String match = m.group(1); 

 final int decimal = Integer.decode(match).intValue(); 

 m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal))); 

 m.appendTail(buf); 

 s = buf.toString(); 

 buf = new StringBuffer(); 

 m = P_ENTITY_UNICODE.matcher(s); 

 while (m.find()) { 

 final String match = m.group(1); 

 final int decimal = Integer.valueOf(match, 16).intValue(); 

 m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal))); 

 m.appendTail(buf); 

 s = buf.toString(); 

 buf = new StringBuffer(); 

 m = P_ENCODE.matcher(s); 

 while (m.find()) { 

 final String match = m.group(1); 

 final int decimal = Integer.valueOf(match, 16).intValue(); 

 m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal))); 

 m.appendTail(buf); 

 s = buf.toString(); 

 s = validateEntities(s); 

 return s; 

 private String validateEntities(final String s) { 

 StringBuffer buf = new StringBuffer(); 

 // validate entities throughout the string 

 Matcher m = P_VALID_ENTITIES.matcher(s); 

 while (m.find()) { 

 final String one = m.group(1); //([^ ]*) 

 final String two = m.group(2); //(?=(;| |$)) 

 m.appendReplacement(buf, Matcher.quoteReplacement(checkEntity(one, two))); 

 m.appendTail(buf); 

 return encodeQuotes(buf.toString()); 

 private String encodeQuotes(final String s){ 

 if(encodeQuotes){ 

 StringBuffer buf = new StringBuffer(); 

 Matcher m = P_VALID_QUOTES.matcher(s); 

 while (m.find()) { 

 final String one = m.group(1); //( |^) 

 final String two = m.group(2); //([^ ]+?) 

 final String three = m.group(3); //( |$) 

 m.appendReplacement(buf, Matcher.quoteReplacement(one + regexReplace(P_QUOTE, " quot;", two) + three)); 

 m.appendTail(buf); 

 return buf.toString(); 

 }else{ 

 return s; 

 private String checkEntity(final String preamble, final String term) { 

 return ";".equals(term) isValidEntity(preamble) 

 ?   + preamble 

 : " amp;" + preamble; 

 private boolean isValidEntity(final String entity) { 

 return inArray(entity, vAllowedEntities); 

 private static boolean inArray(final String s, final String[] array) { 

 for (String item : array) { 

 if (item != null item.equals(s)) { 

 return true; 

 return false; 

 private boolean allowed(final String name) { 

 return (vAllowed.isEmpty() || vAllowed.containsKey(name)) !inArray(name, vDisallowed); 

 private boolean allowedAttribute(final String name, final String paramName) { 

 return allowed(name) (vAllowed.isEmpty() || vAllowed.get(name).contains(paramName)); 

}

View Code

4.SQLFilter

package com.wfcm.xss; 

import org.apache.commons.lang.StringUtils; 

import com.wfcm.utils.RRException; 

 * sql过滤 

 * @author xlf 

 * @email [email protected] 

 * @date 2017年4月19日 上午10:41:25 

public class SQLFilter { 

 /** 

 * SQL注入过滤 

 * @param str 

 * 待验证的字符串 

 public static String sqlInject(String str) { 

 if (StringUtils.isBlank(str)) { 

 return null; 

 // 去掉|"|;|/字符 

 str = StringUtils.replace(str, "", ""); 

 str = StringUtils.replace(str, "/"", ""); 

 str = StringUtils.replace(str, ";", ""); 

 str = StringUtils.replace(str, "//", ""); 

 // 转换成小写 

 str = str.toLowerCase(); 

 // 非法字符 

 String[] keywords = { "master", "truncate", "insert", "select", "delete", "update", "declare", "alert", 

 "create", "drop" }; 

 // 判断是否包含非法字符 

 for (String keyword : keywords) { 

 if (str.equals(keyword)) { 

 throw new RRException("包含非法字符", 1); 

 return str; 

}

View Code

第三步：大功告成！！

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/17447.html