Java 读取写入文件乱码问题解决

//写文件File f = new File(fileName);              if (!f.exists())           {                   f.createNewFile();              }              OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(f),"gbk");              BufferedWriter writer=new BufferedWriter(write);                  writer.write(fileContent);              writer.close();   

//读文件 File f = new File(fileName);              if(f.isFile()&&f.exists())          {                   InputStreamReader read = new InputStreamReader(new FileInputStream(f),"gbk");                   BufferedReader reader=new BufferedReader(read);                   String line;                   while ((line = reader.readLine()) != null)               {                        fileContent += line;                   }                     read.close();