用java语言编写：从文件in.txt中读取内容，再将它写到文件out.txt中，in.txt采用本地平台默认的字符编码，
Java\u8bed\u8a00\u4f7f\u7528\u7684\u5b57\u7b26\u7801\u96c6\u662f\u4e0d\u662f\u5c31\u662f\u5b57\u7b26\u7801\u7cfb\u7edf\uff1f\uff1f\u4e0d\u77e5\u9053\u4f60\u8bf4\u7684\u201c\u5b57\u7b26\u7801\u7cfb\u7edf\u201d\u662f\u4ec0\u4e48\u3002Java\u5185\u90e8\u4f7f\u7528\u7684\u7f16\u7801\u662fUnicode\u3002
\u6709\u53ef\u80fd\u662f\u4f60\u7684classpath \u4e0d\u5bf9\uff01
\u6216\u8005\u662f\u5f15\u7528\u5305\u4e0d\u5bf9\uff0c\u628a\u8fd9\u4e2a\u52a0\u5230\u5934\u4e0a
import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
public class TestJL {
public static void main(String[] args) throws IOException {
FileInputStream fInputStream = new FileInputStream("C:\\in.txt");
InputStreamReader iReader = new InputStreamReader(fInputStream);
BufferedReader bReader = new BufferedReader(iReader);
FileOutputStream fOutputStream = new FileOutputStream("C:\\out.txt",true);
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fOutputStream);
PrintWriter printWriter = new PrintWriter(outputStreamWriter);
String data = "";
//给个标记，待会重读
bReader.mark(1000000);
//不转字符编码
while((data=bReader.readLine())!=null){
printWriter.write(data+"\n");
}
//回到文件头重新读
bReader.reset();
//转字符编码，这里转的是UTF-8，可以指定
while((data=bReader.readLine())!=null){
System.out.println("222");
String aString = new String(data.getBytes(),"UTF-8");
printWriter.write(aString+"\n");
}
bReader.close();
iReader.close();
fInputStream.close();
printWriter.close();
outputStreamWriter.close();
fOutputStream.close();
}
}
给个代码参考下吧，你打开out.txt看见一部分正常，一部分乱码就对了
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