util.java

jaguey,网上的一个朋友给我的

package net.javapassion.jaguey.util;

import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.io.IOException;

//版本: JagueyBBS 1.1
//功能: 论坛数据测试、检测、类型转换
//作者: 赵程佳
//时间: 2006-02-08 19:40:51

public class Util {
	private static final char[] QUOTE_ENCODE = """.toCharArray();
	private static final char[] AMP_ENCODE = "&".toCharArray();
	private static final char[] LT_ENCODE = "<".toCharArray();
	private static final char[] GT_ENCODE = ">".toCharArray();
	
	public static boolean validateUserName(String username) {
	    Pattern pattern = Pattern.compile("^\\w+$");
	    Matcher matcher = pattern.matcher(username);
	    if (matcher.find()) {
	    	return true;
	    }
	    return false;
	}
	
	public static String Array2String(String[] values) {
	    String result = "";
	    if (values == null) {
	    	return result;
	    }
	    int len = values.length;
	    for (int i = 0; i < len; i++) {
	    	result += values[i] + ",";
	    }
	    if (result.endsWith(",")) {
	    	result = result.substring(result.length() - 1);
	    }
	    return result;
	}
	
	public static String Array2String(Object[] values) {
	    String result = "";
	    if (values == null) {
	    	return result;
	    }
	    int len = values.length;
	    for (int i = 0; i < len; i++) {
	    	result += values[i].toString() + ",";
	    }
	    if (result.endsWith(",")) {
	    	result = result.substring(result.length() - 1);
	    }
	    return result;
	}
	
	public static String Array2String(List values) {
	    String result = "";
	    if (values == null) {
	    	return result;
	    }
	    int len = values.size();
	    for (int i = 0; i < len; i++) {
	    	result += values.get(i).toString() + ",";
	    }
	    if (result.endsWith(",")) {
	    	result = result.substring(result.length() - 1);
	    }
	    return result;
	}
	
	public static String base64Encode(String txt) {
	    if (txt != null && txt.length() > 0) {
	    	txt = new sun.misc.BASE64Encoder().encode(txt.getBytes());
	    }
	    return txt;
	}
	
	public static String base64Encode(byte[] txt) {
	    String encodeTxt = "";
	    if (txt != null && txt.length > 0) {
	    	encodeTxt = new sun.misc.BASE64Encoder().encode(txt);
	    }
	    return encodeTxt;
	}
	
	public static String base64decode(String txt) {
	    if (txt != null && txt.length() > 0) {
	    	byte[] buf;
	    	try {
	    		buf = new sun.misc.BASE64Decoder().decodeBuffer(txt);
	    		txt = new String(buf);
	    	} catch (IOException ex) {
	    	}
	    }
	    return txt;
	}
	
	public static byte[] base64decodebyte(String txt) {
	    byte[] buf = null;
	    if (txt != null && txt.length() > 0) {
	    	try {
	    		buf = new sun.misc.BASE64Decoder().decodeBuffer(txt);
	    	} catch (IOException ex) {
	    	}
	    }
	    return buf;
	}
	
	public static final String replace(String line, String oldString, String newString) {
		if (line == null) {
			return null;
		}
		int i = 0;
		if ( (i = line.indexOf(oldString, i)) >= 0) {
			char[] line2 = line.toCharArray();
			char[] newString2 = newString.toCharArray();
			int oLength = oldString.length();
			StringBuffer buf = new StringBuffer(line2.length);
			buf.append(line2, 0, i).append(newString2);
			i += oLength;
			int j = i;
			while ( (i = line.indexOf(oldString, i)) > 0) {
				buf.append(line2, j, i - j).append(newString2);
				i += oLength;
				j = i;
			}
			buf.append(line2, j, line2.length - j);
			return buf.toString();
		}
		return line;
	}
	
	public static final String replaceIgnoreCase(String line, String oldString, String newString) {
		if (line == null) {
			return null;
		}
		String lcLine = line.toLowerCase();
		String lcOldString = oldString.toLowerCase();
		int i = 0;
		if ( (i = lcLine.indexOf(lcOldString, i)) >= 0) {
			char[] line2 = line.toCharArray();
			char[] newString2 = newString.toCharArray();
			int oLength = oldString.length();
			StringBuffer buf = new StringBuffer(line2.length);
			buf.append(line2, 0, i).append(newString2);
			i += oLength;
			int j = i;
			while ( (i = lcLine.indexOf(lcOldString, i)) > 0) {
				buf.append(line2, j, i - j).append(newString2);
				i += oLength;
				j = i;
			}
			buf.append(line2, j, line2.length - j);
			return buf.toString();
		}
		return line;
	}
	
	public static final String replaceIgnoreCase(String line, String oldString, 
			String newString, int[] count) {
		if (line == null) {
			return null;
		}
		String lcLine = line.toLowerCase();
		String lcOldString = oldString.toLowerCase();
		int i = 0;
		if ( (i = lcLine.indexOf(lcOldString, i)) >= 0) {
			int counter = 0;
			char[] line2 = line.toCharArray();
			char[] newString2 = newString.toCharArray();
			int oLength = oldString.length();
			StringBuffer buf = new StringBuffer(line2.length);
			buf.append(line2, 0, i).append(newString2);
			i += oLength;
			int j = i;
			while ( (i = lcLine.indexOf(lcOldString, i)) > 0) {
				counter++;
				buf.append(line2, j, i - j).append(newString2);
				i += oLength;
				j = i;
			}
			buf.append(line2, j, line2.length - j);
			count[0] = counter;
			return buf.toString();
		}
		return line;
	}
	
	public static final String replace(String line, String oldString, 
            String newString, int[] count) {
		if (line == null) {
			return null;
		}
		int i = 0;
		if ( (i = line.indexOf(oldString, i)) >= 0) {
			int counter = 0;
			counter++;
			char[] line2 = line.toCharArray();
			char[] newString2 = newString.toCharArray();
			int oLength = oldString.length();
			StringBuffer buf = new StringBuffer(line2.length);
			buf.append(line2, 0, i).append(newString2);
			i += oLength;
			int j = i;
			while ( (i = line.indexOf(oldString, i)) > 0) {
				counter++;
				buf.append(line2, j, i - j).append(newString2);
				i += oLength;
				j = i;
			}
			buf.append(line2, j, line2.length - j);
			count[0] = counter;
			return buf.toString();
		}
		return line;
	}
	
	public static final String escapeHTMLTags(String in) {
	    if (in == null) {
	    	return null;
	    }
	    char ch;
	    int i = 0;
	    int last = 0;
	    char[] input = in.toCharArray();
	    int len = input.length;
	    StringBuffer out = new StringBuffer( (int) (len * 1.3));
	    for (; i < len; i++) {
	    	ch = input[i];
	    	if (ch > '>') {
	    		continue;
	    	} else if (ch == '<') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(LT_ENCODE);
	    	} else if (ch == '>') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(GT_ENCODE);
	    	}
	    }
	    if (last == 0) {
	    	return in;
	    }
	    if (i > last) {
	    	out.append(input, last, i - last);
	    }
	    return out.toString();
	}
	
	public static final String chopAtWord(String string, int length) {
	    if (string == null) {
	    	return string;
	    }
	    char[] charArray = string.toCharArray();
	    int sLength = string.length();
	    if (length < sLength) {
	    	sLength = length;
	    }
	    for (int i = 0; i < sLength - 1; i++) {
	    	// Windows
	    	if (charArray[i] == '\r' && charArray[i + 1] == '\n') {
	    		return string.substring(0, i + 1);
	    	}
	    	// Unix
	    	else if (charArray[i] == '\n') {
	    		return string.substring(0, i);
	    	}
	    }
	    
	    if (charArray[sLength - 1] == '\n') {
	    	return string.substring(0, sLength - 1);
	    }
	    if (string.length() < length) {
	    	return string;
	    }
	    for (int i = length - 1; i > 0; i--) {
	    	if (charArray[i] == ' ') {
	    		return string.substring(0, i).trim();
	    	}
	    }
	    return string.substring(0, length);
	}
	
	public static final String escapeForXML(String string) {
	    if (string == null) {
	    	return null;
	    }
	    char ch;
	    int i = 0;
	    int last = 0;
	    char[] input = string.toCharArray();
	    int len = input.length;
	    StringBuffer out = new StringBuffer( (int) (len * 1.3));
	    for (; i < len; i++) {
	    	ch = input[i];
	    	if (ch > '>') {
	    		continue;
	    	} else if (ch == '<') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(LT_ENCODE);
	    	} else if (ch == '&') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(AMP_ENCODE);
	    	} else if (ch == '"') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(QUOTE_ENCODE);
	    	}
	    }
	    if (last == 0) {
	    	return string;
	    }
	    if (i > last) {
	    	out.append(input, last, i - last);
	    }
	    return out.toString();
	}
	
	public static final String escapeForSpecial(String string) {
	    if (string == null) {
	    	return null;
	    }
	    char ch;
	    int i = 0;
	    int last = 0;
	    char[] input = string.toCharArray();
	    int len = input.length;
	    StringBuffer out = new StringBuffer( (int) (len * 1.3));
	    for (; i < len; i++) {
	    	ch = input[i];
	    	if (ch > '>') {
	    		continue;
	    	}else if (ch == '<') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(LT_ENCODE);
	    	} else if (ch == '&') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(AMP_ENCODE);
	    	} else if (ch == '"') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(QUOTE_ENCODE);
	    	} else if (ch == '>') {
	    		if (i > last) {
	    			out.append(input, last, i - last);
	    		}
	    		last = i + 1;
	    		out.append(GT_ENCODE);
	    	}
	    }
	    if (last == 0) {
	    	return string;
	    }
	    if (i > last) {
	    	out.append(input, last, i - last);
	    }
	    return out.toString();
	}
	
	public static final String unescapeFromXML(String string) {
	    string = replace(string, "&lt;", "<");
	    string = replace(string, "&gt;", ">");
	    string = replace(string, "&quot;", "\"");
	    return replace(string, "&amp;", "&");
	}
	
	public static String getAsciiString(int digit) {
	    byte ret[] = new byte[1];
	    ret[0] = (byte) digit;
	    return new String(ret);
	}

	public static int getAsciiNum(String s) {
	    if (s.length() < 1) {
	    	return 0;
	    }
	    byte b = s.getBytes()[0];
	    return b;
	}
	
	public static boolean nullOrBlank(String param) {
	    return (param == null || param.length() == 0 || param.trim().equals("")) ? true : false;
	}

	public static String notNull(String param) {
	    return param == null ? "" : param.trim();
	}
}