javadbf修正数据中文乱码及奇数字节丢失最后一个字节问题

/* Utils Class for contining utility functions. This file is part of JavaDBF packege. author: anil@linuxense.com license: LGPL (http://www.gnu.org/copyleft/lesser.html) $Id: Utils.java,v 1.8 2004-07-19 08:58:11 anil Exp $ http://blog.csdn.net/wq1917/article/details/6139221 modifyed by lx 20120917 修改中文问题，及奇数缺少最后一个字节的问题。源代码为官方0.4.0最后的源码 */ package com.linuxense.javadbf; import java.io.*; import java.util.*; import java.text.*; /** Miscelaneous functions required by the JavaDBF package. */ public final class Utils { public static final int ALIGN_LEFT = 10; public static final int ALIGN_RIGHT = 12; public static int readLittleEndianInt( DataInput in) throws IOException { int bigEndian = 0; for( int shiftBy=0; shiftBy<32; shiftBy+=8) { bigEndian |= (in.readUnsignedByte()&0xff) << shiftBy; } return bigEndian; } public static short readLittleEndianShort( DataInput in) throws IOException { int low = in.readUnsignedByte() & 0xff; int high = in.readUnsignedByte(); return (short )(high << 8 | low); } public static byte[] trimLeftSpaces( byte [] arr) { StringBuffer t_sb = new StringBuffer( arr.length); for( int i=0; i<arr.length; i++) { if( arr[i] != ' ') { t_sb.append( (char)arr[ i]); } } return t_sb.toString().getBytes(); } public static short littleEndian( short value) { short num1 = value; short mask = (short)0xff; short num2 = (short)(num1&mask); num2<<=8; mask<<=8; num2 |= (num1&mask)>>8; return num2; } public static int littleEndian(int value) { int num1 = value; int mask = 0xff; int num2 = 0x00; num2 |= num1 & mask; for( int i=1; i<4; i++) { num2<<=8; mask <<= 8; num2 |= (num1 & mask)>>(8*i); } return num2; } public static byte[] textPadding( String text, String characterSetName, int length) throws java.io.UnsupportedEncodingException { return textPadding( text, characterSetName, length, Utils.ALIGN_LEFT); } public static byte[] textPadding( String text, String characterSetName, int length, int alignment) throws java.io.UnsupportedEncodingException { return textPadding( text, characterSetName, length, alignment, (byte)' '); } public static byte[] textPadding( String text, String characterSetName, int length, int alignment, byte paddingByte) throws java.io.UnsupportedEncodingException { /* if( text.length() >= length) { return text.substring( 0, length).getBytes( characterSetName); } byte byte_array[] = new byte[ length]; Arrays.fill( byte_array, paddingByte); switch( alignment) { case ALIGN_LEFT: System.arraycopy( text.getBytes( characterSetName), 0, byte_array, 0, text.length()); break; case ALIGN_RIGHT: int t_offset = length - text.length(); System.arraycopy( text.getBytes( characterSetName), 0, byte_array, t_offset, text.length()); break; } return byte_array;*/ byte[] srcByteArray = text.getBytes(characterSetName); byte[] byte_array = new byte[length]; Arrays.fill(byte_array, paddingByte); int dstLength = 0; if (srcByteArray.length > length) // 原先为if (srcByteArray.length >= length) dstLength = (length % 2 == 0) ? length : length - 1; else { dstLength = srcByteArray.length; } switch (alignment) { case ALIGN_LEFT: System.arraycopy(srcByteArray, 0, byte_array, 0, dstLength); break; case ALIGN_RIGHT: int t_offset = length - dstLength; System.arraycopy(srcByteArray, 0, byte_array,t_offset, dstLength); break; } return byte_array; } public static byte[] doubleFormating( Double doubleNum, String characterSetName, int fieldLength, int sizeDecimalPart) throws java.io.UnsupportedEncodingException{ int sizeWholePart = fieldLength - (sizeDecimalPart>0?( sizeDecimalPart + 1):0); StringBuffer format = new StringBuffer( fieldLength); for( int i=0; i<sizeWholePart; i++) { format.append( "#"); } if( sizeDecimalPart > 0) { format.append( "."); for( int i=0; i<sizeDecimalPart; i++) { format.append( "0"); } } DecimalFormat df = new DecimalFormat( format.toString()); return textPadding( df.format( doubleNum.doubleValue()).toString(), characterSetName, fieldLength, ALIGN_RIGHT); } public static boolean contains( byte[] arr, byte value) { boolean found = false; for( int i=0; i<arr.length; i++) { if( arr[i] == value) { found = true; break; } } return found; } }