精通eclipse-web开发-bbs论坛源码系统

package com.bbs.util; import java.util.Map; import java.util.HashMap; import java.util.Iterator; import java.io.IOException; import java.util.StringTokenizer; import java.security.MessageDigest; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * String Utility Class This is used to encode passwords programmatically * * <p> * <a h * ref="StringUtil.java.html"><i>View Source</i></a> * </p> * * @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a> */ public class StringUtil { //~ Static fields/initializers ============================================= private final static Log log = LogFactory.getLog(StringUtil.class); //~ Methods ================================================================ /** * Encode a string using algorithm specified in web.xml and return the * resulting encrypted password. If exception, the plain credentials * string is returned * * @param password Password or other credentials to use in authenticating * this username * @param algorithm Algorithm used to do the digest * * @return encypted password based on the algorithm. */ public static String encodePassword(String password, String algorithm) { byte[] unencodedPassword = password.getBytes(); MessageDigest md = null; try { // first create an instance, given the provider md = MessageDigest.getInstance(algorithm); } catch (Exception e) { log.error("Exception: " + e); return password; } md.reset(); // call the update method one or more times // (useful when you don't know the size of your data, eg. stream) md.update(unencodedPassword); // now calculate the hash byte[] encodedPassword = md.digest(); StringBuffer buf = new StringBuffer(); for (int i = 0; i < encodedPassword.length; i++) { if ((encodedPassword[i] & 0xff) < 0x10) { buf.append("0"); } buf.append(Long.toString(encodedPassword[i] & 0xff, 16)); } return buf.toString(); } /** * Encode a string using Base64 encoding. Used when storing passwords * as cookies. * * This is weak encoding in that anyone can use the decodeString * routine to reverse the encoding. * * @param str * @return String */ public static String encodeString(String str) { sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder(); return encoder.encodeBuffer(str.getBytes()).trim(); } /** * Decode a string using Base64 encoding. * * @param str * @return String */ public static String decodeString(String str) { sun.misc.BASE64Decoder dec = new sun.misc.BASE64Decoder(); try { return new String(dec.decodeBuffer(str)); } catch (IOException io) { throw new RuntimeException(io.getMessage(), io.getCause()); } } public static String truncate(String source, int len, String delim) { if (source == null) return ""; int start, stop , byteLen; int alen = source.getBytes().length; //len = len / 2; if (len > 0) { if (alen <= len) return source; start = stop = byteLen = 0; //TODO effizienter while ( byteLen <= len){ if ( source.substring(stop,stop+1).getBytes().length == 1){ byteLen += 1 ; }else{ byteLen += 2 ; } stop++; } StringBuffer sb = new StringBuffer(source.substring(start, stop-1)); if (alen > len) sb.append(delim); return sb.toString(); } return source; } public static String truncate( String str ){ return truncate(str , 20 , "..."); } public static String clob2String(java.sql.Clob clob){ java.io.Reader in = null ; try{ in = clob.getCharacterStream(); }catch(Exception e){ } if (in == null) return null; StringBuffer sb = new StringBuffer(2048); try { int i = in.read(); while (i != -1) { sb.append((char) i); i = in.read(); } in.close(); } catch (Exception e) { } return sb.toString(); } /** * Encodes a string for inserting to database table * * @param inputString input string * @return encoded string */ public static String escape(String inputString) { if (inputString == null) return null; StringBuffer buf = new StringBuffer((int) (inputString.length() * 1.1)); int stringLength = inputString.length(); for ( int i = 0; i < stringLength; ++i ) { char c = inputString.charAt(i); switch ( c ) { /* case 0: /* Must be escaped for 'mysql' buf.append('\\'); buf.append('0'); break; case '\n': Must be escaped for logs buf.append('\\'); buf.append('n'); break; case '\r': buf.append('\\'); buf.append('r'); break; */ case '\'': buf.append("&#39;"); //buf.append('\''); break; default: buf.append(c); } } return buf.toString(); } public static String escape1(String inputString) { if (inputString == null) return null; StringBuffer buf = new StringBuffer((int) (inputString.length() * 1.1)); int stringLength = inputString.length(); for ( int i = 0; i < stringLength; ++i ) { char c = inputString.charAt(i); switch ( c ) { /* case 0: /* Must be escaped for 'mysql' buf.append('\\'); buf.append('0'); break; case '\n': Must be escaped for logs buf.append('\\'); buf.append('n'); break; case '\r': buf.append('\\'); buf.append('r'); break; */ case '\\': buf.append('\\'); buf.append('\\'); break; case '\'': buf.append("&#39;"); //buf.append('\''); break; default: buf.append(c); } } return buf.toString(); } /** * Replaces all HTML-sensitive characters with their entity equivalents * @param html String to encode * @return string with all HTML-sensitive characters replaced with their entity equivalents */ public static String htmlEncode(String html) { if ( html == null ) { return null; } StringBuffer buf = new StringBuffer((int) (html.length() * 1.1)); int stringLength = html.length(); for ( int i = 0; i < stringLength; ++i ) { char c = html.charAt(i); switch ( c ) { case '\'': buf.append("&#39;"); break; case '"': buf.append("&quot;"); break; case '<': buf.append("&lt;"); break; case '>': buf.append("&gt;"); break; case '&': buf.append("&amp;"); case ' ': buf.append("&nbsp;"); case '\r': buf.append("<br>"); case '\n': buf.append("<br>"); break; default: buf.append(c); } } return buf.toString(); } public static String htmlDeEncode(String html) { if ( html == null ) { return null; } StringBuffer buf = new StringBuffer((int) (html.length() * 1.1)); int stringLength = html.length(); for ( int i = 0; i < stringLength; ++i ) { char c = html.charAt(i); switch ( c ) { case '\'': buf.append("&#39;"); break; case '"': buf.append("&quot;"); break; case '<': buf.append("&lt;"); break; case '>': buf.append("&gt;"); break; case '&': buf.append("&amp;"); case ' ': buf.append("&nbsp;"); case '\r': buf.append("<br>"); case '\n': buf.append("<br>"); break; default: buf.append(c); } } return buf.toString(); } public static String filter(String value) { if (value == null) return "&nbsp;"; StringBuffer result = new StringBuffer(); for (int i = 0; i < value.length(); i++) { char ch = value.charAt(i); if (ch == '<') result.appen