Java IO（十七）FIleReader 和 FileWriter

public class FileDemo {
    private static char[] chs = new char[] 
            {‘a‘,‘b‘,‘c‘,‘d‘,‘e‘,‘f‘,‘g‘,‘h‘,‘i‘,‘j‘,‘k‘,‘l‘,‘m‘,
            ‘n‘,‘o‘,‘p‘,‘q‘,‘r‘,‘s‘,‘t‘,‘u‘,‘v‘,‘w‘,‘x‘,‘y‘,‘z‘};
    public static void main(String[] args) {
        write();
        read();
    }
    
    /**
     * FileWriter 测试
     */
    public static void write() {
        FileWriter out = null;
        try {
            // 给定文件名，并指定追加模式：true，续写到文件中
            out = new FileWriter("file.txt",true);
            out.write("字节流转换为字符的案例");// 写入中文字符
            out.write("0123456789");// 写入数字并换行
            out.write(chs);// 写入字符数组
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if (out != null)
                    out.close();
            }catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    
    /**
     *  FileReader 测试
     */
    public  static void read() {
        FileReader in = null;
        char[] buff = new char[10];
        int len = 0;
        try {
            in = new FileReader("file.txt");
            System.out.println("read : " + (char)in.read());// 读取一个字符
            in.skip(5);// 跳过5个字符
            len = in.read(buff, 0, 10);// 从0开始读取10个字符缓存到buff中
            System.out.println("buff : " + new String(buff,0,len));
            // 读取剩余字符
            while((len = in.read(buff)) != -1){
                System.out.println("str : " + new String(buff,0,len));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if (in != null)
                    in.close();
            }catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}