解决pdfbox中文乱码问题

Question

网上搜的中文解决办法都不管用，花了几天时间，终于自己解决了。 
##org.apache.pdfbox.pdmodel.font.PDFont.java public String encode( byte[] c, int offset, int length ) throws IOException
    {
        String retval = null;
        if( cmap != null )
        {
            if (length == 1 && cmap.hasOneByteMappings()) 
            {
                retval = cmap.lookup( c, offset, length );
            }
            else if (length == 2 && cmap.hasTwoByteMappings())
            {
                retval = cmap.lookup( c, offset, length );
            }
            
        }
        
        // there is no cmap but probably an encoding with a suitable mapping
        if( retval == null )
        {
            Encoding encoding = getEncoding();
            if( encoding != null )
            {
                retval = encoding.getCharacter( getCodeFromArray( c, offset, length ) );
            }
            
            // when the font has a DescendantFonts ,try to decode with it
            if(length == 2 && retval == null && this instanceof PDType0Font)
            { 
                COSArray descendantFontArray =(COSArray)font.getDictionaryObject( COSName.DESCENDANT_FONTS );
                
                if( descendantFontArray != null && descendantFontArray.size() != 0)
                {
                 COSDictionary descendantFontDictionary = (COSDictionary)descendantFontArray.getObject( 0 );
                 PDFont descendentFont = PDFontFactory.createFont( descendantFontDictionary );
                    CMap cmp = descendentFont.cmap ;
                    String cmpName = cmp.getRegistry()+"-"+cmp.getOrdering()+"-UCS2";
                    CMap cmp2 = cmapObjects.get(cmpName);
                    
                    if(cmp2 == null && threadLocale.get() == null)
                    {
                    parseCmap( resourceRootCMAP, getClass().getResourceAsStream(cmpName), COSName.getPDFName(cmpName) );
                    threadLocale.set(true);
                    cmp2 = cmapObjects.get(cmpName);
                    if(cmp2 == null)
                    {
                        log.warn("Can't parse the CMap for " + cmpName);
                    }
                    }
                    
                    if(cmp2 != null)
                    {
                     retval = cmp2.lookup(c, offset, length);
                    }
                    
                }
            }
            
            if( retval == null && (cmap == null || length == 2))
            {
                retval = getStringFromArray( c, offset, length );
            }
        }
        return retval;
    }