stringutils.java

一个JAVA做的FTP软件,带源码的,可以很好的进行二次开发,,并带有详细说明文件的

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package net.sf.jftp.util;

import java.io.*;


public class StringUtils
{

    /**
    * Makes a (path) string shorter to get it displayed correctly
    */
    public static String cutPath(String s)
    {
        int maxlabel = 64;

        if(s.length() > maxlabel)
        {
            while(true)
            {
                s = StringUtils.cutAfter(s, '/');

                if(s.length() < 16)
                {
                    StringBuffer sb = new StringBuffer(s);
                    sb.insert(0, ".../");

                    return sb.toString();
                }
            }
        }

        return s;
    }
    
    /**
    * Removes the a string at the beginning of a string
    */
    public static String removeStart(String str, String what)
    {
        if(str.startsWith(what))
        {
            int x = what.length();

            return str.substring(x);
        }
        else
        {
            return str;
        }
    }

    /**
    * Returns the rest of a string after a given character
    */
    public static String cutAfter(String str, char c)
    {
        for(int i = 0; i < str.length(); i++)
        {
            if(str.charAt(i) == c)
            {
                //   System.out.println(str.substring(i+1));
                return str.substring(i + 1);
            }
        }

        return str;
    }

    /**
    * Used to search for return codes in a string array.
    * Returns the first one found
    */
    public static String contains(String[] tmp, String[] str)
    {
        for(int i = 0; i < tmp.length; i++)
        {
            for(int j = 0; j < str.length; j++)
            {
                if(tmp[i].startsWith(str[j]))
                {
                    return tmp[i];
                }
            }
        }

        return "";
    }

    /**
    * Returns true if the given string contains the given character
    */
    public static boolean strstr(String tmp, char str)
    {
        for(int i = 0; i < tmp.length(); i++)
        {
            if(tmp.charAt(i) == str)
            {
                return true;
            }
        }

        return false;
    }

    /**
    * Returns a string representing a given character
    */
    public static String string(char c)
    {
        char[] buf = new char[1];
        buf[0] = c;

        return new String(buf);
    }

    /**
    * Get a filename out of a full path string
    */
    public static String getFile(String file)
    {
        int x = file.lastIndexOf("/");

        // unix
        if(x >= 0)
        {
            file = file.substring(x + 1);
        }

        // windows
        x = file.lastIndexOf("\\");

        if(x >= 0)
        {
            file = file.substring(x + 1);
        }

        // may work, but can test the other method better
        //int x  = file.lastIndexOf(File.separatorChar);
        //if(x >= 0) file = file.substring(x+1);
        //System.out.println(file);
        return file;
    }

    /**
    * Returns a string representing a relative directory path.
    * Examples: "/tmp/dir/" -> "dir/" and "/tmp/dir" -> "dir"
    */
    public static String getDir(String tmp)
    {
        int x;

        while(true)
        {
            x = tmp.indexOf("/");

            if((x == (tmp.length() - 1)) || (x < 0))
            {
                break;
            }
            else
            {
                tmp = tmp.substring(x + 1);
            }
        }

        while(true)
        {
            x = tmp.indexOf("\\");

            if((x == (tmp.length() - 1)) || (x < 0))
            {
                break;
            }
            else
            {
                tmp = tmp.substring(x + 1);
            }
        }

        return tmp;
    }

    /*
    * Returns true if the string represents a relative filename, false otherwise
    */
    public static boolean isRelative(String file)
    {
        // unix
        if(file.startsWith("/"))
        {
            return false;
        }

        // windows
        if((file.length() > 2) && (file.charAt(1) == ':'))
        {
            return false;
        }

        //System.out.println("true: " + file);
        // default
        return true;
    }

    /**
    * Main method containing a few testcases for getFile() / isRelative()
    */
    public static void main(String[] argv)
    {
        String a1 = "E:\\programme\\test.html";
        String a2 = "programme\\test.html";
        String a3 = "test.html";
        String a4 = "/programme/test.html";
        String a5 = "programme/test.html";

        System.out.println("getfile: " + getFile(a1) + " - false, " +
                           isRelative(a1));
        System.out.println("getfile: " + getFile(a2) + " - true, " +
                           isRelative(a2));
        System.out.println("getfile: " + getFile(a3) + " - true, " +
                           isRelative(a3));
        System.out.println("getfile: " + getFile(a4) + " - false, " +
                           isRelative(a4));
        System.out.println("getfile: " + getFile(a5) + " - true, " +
                           isRelative(a5));
    }
    
    public static String cut(String tmp, String where)
    {
        StringBuffer ret = new StringBuffer();

        for(int i = 0; i < tmp.length(); i++)
        {
            if(!string(tmp.charAt(i)).equals(where))
            {
                ret.append(string(tmp.charAt(i)));
            }

            if(string(tmp.charAt(i)).equals(where))
            {
                return ret.toString();
            }
        }

        return ret.toString();
    }
}