java 读写文件

读文件

try {
            FileInputStream fis = new FileInputStream(new File("a.txt"));
            InputStreamReader isr = new InputStreamReader(fis,"utf-8");
            BufferedReader br = new BufferedReader(isr);
            String line;
            while((line = br.readLine())!=null){
                System.out.println(line);
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

写文件

        try {
            FileOutputStream fos = new FileOutputStream(new File("a.txt"));
            OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write("abcdefg");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }