java 读写文件乱码问题

这样写，会出现乱码。原因是文件时gbk格式的，

BufferedReader br = new BufferedReader(new FileReader(indir));
        BufferedWriter bw = new BufferedWriter(new FileWriter(outpath,true));
        

所以可以这样改：

//用fileinputstream才能解决读写文件乱码问题.视文件是gbk还是utf32而更改下面对应的字符。
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(indir), "gbk"));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outpath), "gbk"));