Java-读取、处理和写入UTF-8文件

Question

in = Paths.get( <filename1> );
out = Paths.get( <filename2> );

Files.deleteIfExists( out );
Files.createFile( out );

CharsetDecoder decoder = StandardCharsets.UTF_8.newDecoder();
decoder.onMalformedInput( CodingErrorAction.IGNORE );
decoder.onUnmappableCharacter( CodingErrorAction.IGNORE );

BufferedReader reader = new BufferedReader( 
    new InputStreamReader(
        new FileInputStream( this.in.toFile() ), decoder ) );

CharsetEncoder encoder = StandardCharsets.UTF_8.newEncoder();
encoder.onMalformedInput( CodingErrorAction.IGNORE );
encoder.onUnmappableCharacter( CodingErrorAction.IGNORE );

BufferedWriter writer = new BufferedWriter( 
    new OutputStreamWriter(
        new FileOutputStream( this.out.toFile() ), encoder) );

char[] charBuffer = new char[100];
int readCharCount;
StringBuffer buffer = new StringBuffer();

while( ( readCharCount = reader.read( charBuffer ) ) > 0 )
{
    buffer.append( charBuffer, 0, readCharCount );
    //here goes more code to process the content
    //buffer must be written to output on each iteration
}

writer.write( buffer.toString() );
reader.close();
writer.close();

byte[] bytesf1 = Files.readAllBytes( Paths.get( <filename1> ) );
byte[] bytesf2 = Files.readAllBytes( Paths.get( <filename2> ) );
assertTrue( bytesf1.equals( bytesf2 ) ); 

除非我能在确保输入文件是用UTF-8编码后使测试工作，否则什么是基本错误，我真正感兴趣的问题是：

上面的方法是否保证了UTF-8文件中的缺陷也被逐个复制，或者将字符加载到StringBuffer的过程是否改变了这一点？

Answer 1

Java数组不实现基于值的equals。这将永远失败：

assertTrue( bytesf1.equals( bytesf2 ) ); 

考虑：

assertArrayEquals(bytesf1, bytesf2);

或

assertTrue(Arrays.equals(bytesf1, bytesf2));