Java读写文件

对文件的读写有两种方式：字符流和字节流

字节流读文件

 public static String byteReading(File file){        StringBuilder sb = new StringBuilder();        try {            FileInputStream in = new FileInputStream(file);            byte[] bytes = new byte[1024];            int s;            while ((s=in.read(bytes))!=-1){                sb.append(new String(bytes, 0, s, "utf-8"));            }            in.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return sb.toString();    }
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字符流读文件

public static String charReading(File file){        StringBuilder sb = new StringBuilder();        try {            BufferedReader bufferedReader = new BufferedReader(new FileReader(file));            String s;            while ((s=bufferedReader.readLine())!=null){                sb.append(s);            }            bufferedReader.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return sb.toString();    }
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字节流写文件

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public static void byteWrite(File file){        try {            FileOutputStream fos = new FileOutputStream(file);            String s = "hello world!";            fos.write(s.getBytes());            fos.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }
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字节流写文件

public static void charWrite(File file){        FileWriter fw = null;        try {            fw = new FileWriter(file);            String s = "hello world";            fw.write(s,0,s.length());            fw.flush();        } catch (IOException e) {            e.printStackTrace();        }    }
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