FileWriter FileReader 不支持设定资料编码

InputStreamReader OutputStreamWriter支持文件编码

FileWriter FileReader不支持设定编码

br = new BufferedReader(new InputStreamReader(url.openStream(),"UTF-8"));
			
// bw = new BufferedWriter(new FileWriter(file));
bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file),"UTF-8"));