stringutils.java

一个留言板 系统平台： JSP+SQLServer 支持开通无限个数的留言板

/*
 * StringUtils.java
 *
 * Created on 2005年12月29日, 下午1:02
 */

package tot.util;
import java.io.UnsupportedEncodingException;
import java.util.Random;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.net.URLCodec;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.regex.*;

// Referenced classes of package net.lybbs.util:
//            Constants

public class StringUtils
{

    private static Log log;
    public static final String EN = "ISO-8859-1";
    public static final String CN = "GBK";

    public StringUtils()
    {
    }

    public static String ISO2GB(String isoStr)
        throws UnsupportedEncodingException
    {
        return new String(isoStr.getBytes("ISO-8859-1"), "GBK");
    }

    public static String GB2ISO(String gbStr)
        throws UnsupportedEncodingException
    {
        return new String(gbStr.getBytes("GBK"), "ISO-8859-1");
    }

    public static String getIP(HttpServletRequest request)
    {
        String ip = request.getRemoteAddr();
        return ip != null ? ip : "";
    }

    public static String replaceChar(String source, char oldChar, char newChar)
    {
        if(source == null)
        {
            return "";
        } else
        {
            return source.replace(oldChar, newChar);
        }
    }

    public static String replaceString(String source, String oldString, String newString)
    {
        if(source == null || oldString == null || newString == null)
        {
            return "";
        } else
        {
            return replace(source, oldString, newString);
        }
    }

    public static String[] split(String source, String regex)
    {
        if(source == null || source.equals(""))
        {
            return new String[0];
        } else
        {
            return source.split(regex);
        }
    }

    private static String replace(String source, String oldString, String newString)
    {
        StringBuffer output = new StringBuffer();
        int lengthOfSource = source.length();
        int lengthOfOld = oldString.length();
        int posStart;
        int pos;
        for(posStart = 0; (pos = source.indexOf(oldString, posStart)) >= 0; posStart = pos + lengthOfOld)
        {
            output.append(source.substring(posStart, pos));
            output.append(newString);
        }

        if(posStart < lengthOfSource)
        {
            output.append(source.substring(posStart));
        }
        return output.toString();
    }

    public static String toQuoteMark(String str)
    {
        str = replaceString(str, "'", "&#39;");
        str = replaceString(str, "\"", "&#34;");
        str = replace(str, "\\", "&#92;");
        str = replaceString(str, "\r\n", "\n");
        str = replaceString(str, "\\n", "\n");
        return str;
    }

    public static String toHtml(String str)
    {
        str = replaceString(str, "<", "&#60;");
        str = replaceString(str, ">", "&#62;");
        return str;
    }

    public static String toBR(String str)
    {
        str = replaceString(str, "\\n", "\n");
        str = replaceString(str, "\n", "<br>\n");
        str = replaceString(str, "  ", "&nbsp;&nbsp;");
        return str;
    }

    public static String toSQL(String str)
    {
        str = replaceString(str, "\r\n", "\n");
        return str;
    }
    public static String htmlFilter(String str){
        StringBuffer stringbuffer = new StringBuffer();
        for(int i = 0; i < str.length(); i++)
        {
            char c = str.charAt(i);
            switch(c)
            {
            case 39: // '\''
                stringbuffer.append("&#039;");
                break;

            case 34: // '"'
                stringbuffer.append("&quot;");
                break;

            case 60: // '<'
                stringbuffer.append("&lt;");
                break;

            case 62: // '>'
                stringbuffer.append("&gt;");
                break;

            case 38: // '&'
                stringbuffer.append("&amp;");
                break;

            case 32: // ' '
                stringbuffer.append("&nbsp;");
                break;

            case 10: // '\n'
                stringbuffer.append("<br>");
                break;

            default:
                stringbuffer.append(c);
                break;
            }
        }

        return stringbuffer.toString();
    }
    public static String base64Encode(String str)
    {
        if(str != null && str.length() > 0)
        {
            str = new String((new Base64()).encode(str.getBytes()));
        }
        return str;
    }

    public static String base64Decode(String str)
    {
        if(str != null && str.length() > 0)
        {
            byte buf[] = (new Base64()).decode(str.getBytes());
            str = new String(buf);
        }
        return str;
    }

    public static String base64Encode(byte str[])
    {
        String encodeStr = "";
        if(str != null && str.length > 0)
        {
            encodeStr = new String((new Base64()).encode(str));
        }
        return encodeStr;
    }

    public static byte[] base64DecodeForByte(String str)
    {
        byte buf[] = (byte[])null;
        if(str != null && str.length() > 0)
        {
            buf = (new Base64()).decode(str.getBytes());
        }
        return buf;
    }

    public static String getRandomNumber(int bits, int to)
    {
        StringBuffer randBuffer = new StringBuffer();
        Random RANDOM = new Random();
        for(int i = 1; i <= bits; i++)
        {
            randBuffer.append(RANDOM.nextInt(to));
        }

        return randBuffer.toString();
    }

    public static String urlEncode(String str)
        throws EncoderException
    {
        URLCodec URLCODEC = new URLCodec("UTF-8");
        return URLCODEC.encode(str);
    }

    public static String urlDecode(String str)
        throws DecoderException
    {
        return str;
    }

    public static String getSQL(String sql, boolean hasOffset, int from, int to)
    {
        return getMysqlSQL(sql, hasOffset);
    }

    public static String getMysqlSQL(String sql, boolean hasOffset)
    {
        StringBuffer sb = new StringBuffer(sql.length() + 20);
        sb.append(sql).append(hasOffset ? " limit ?, ?" : " limit ?");
        return sb.toString();
    }

    public static String getDb2SQL(String sql, boolean hasOffset)
    {
        StringBuffer sb = new StringBuffer(sql.length() + 100);
        return sb.toString();
    }

    public static String getOracleSQL(String sql, boolean hasOffset)
    {
        StringBuffer sb = new StringBuffer(sql.length() + 100);
        return sb.toString();
    }

    public static String getMssqlSQL(String sql, boolean hasOffset, int from, int to)
    {
        StringBuffer sb = new StringBuffer(sql.length() + 100);
        return sb.toString();
    }

    private static String getRowNumber(String sql)
    {
        StringBuffer rownumber = new StringBuffer(50);
        return rownumber.toString();
    }

    private static int getAfterSelectInsertPoint(String sql)
    {
        int selectIndex = sql.indexOf("select");
        return selectIndex + 6;
    }
    public static String getTopic(String str,int max){
        String tempStr=null;
        tempStr=str;
        if(tempStr.length()>max){
            tempStr=tempStr.substring(0,max)+"...";
            return tempStr;
        }
        else{
            return tempStr;
        }
    }
    public static String removeHtml(String str){
        String tempStr=null;
        tempStr=str;
        Pattern pattern = Pattern.compile("<.+?>");
        Matcher matcher = pattern.matcher(str);
        if(matcher.find()){
            tempStr=matcher.replaceAll("");
        }
        return tempStr;
    }
    public static String returnToBr(String s)
    {
        if(s == null || s.equals(""))
        {
            return s;
        }
        StringBuffer stringbuffer = new StringBuffer();
        for(int i = 0; i <= s.length() - 1; i++)
        {
            if(s.charAt(i) == '\r')
            {
                stringbuffer = stringbuffer.append("<br>");
            } else
            if(s.charAt(i) == ' ')
            {
                stringbuffer = stringbuffer.append("&nbsp;");
            } else
            {
                stringbuffer = stringbuffer.append(s.substring(i, i + 1));
            }
        }

        String s1 = stringbuffer.toString();
        return s1;
    }

    public static String returnToHTML(String s)
    {
        if(s == null || s.equals(""))
        {
            return s;
        }
        StringBuffer stringbuffer = new StringBuffer();
        for(int i = 0; i <= s.length() - 1; i++)
        {
            if(s.charAt(i) == '<')
            {
                stringbuffer = stringbuffer.append("&lt;");
            } else
            if(s.charAt(i) == '>')
            {
                stringbuffer = stringbuffer.append("&gt;");
            } else
            {
                stringbuffer = stringbuffer.append(s.substring(i, i + 1));
            }
        }

        String s1 = stringbuffer.toString();
        return s1;
    }
    static 
    {
        log = LogFactory.getLog(StringUtils.class);
    }
}