【Java】字符流

1.字符流的引入
在没有字符流之前，当从文件里面读取字符流的时候回出现乱码
如：

 @Test
    public void test1() throws Exception{
        FileInputStream fin = new FileInputStream("D:\\A流\\b.txt");
        int t;
        while ((t = fin.read()) != -1){
            System.out.print((char)t);
        }
        fin.close();
    }

2.字符流的使用

 @Test
    public void test2() throws Exception{
        FileWriter fw = new FileWriter("D:\\A流\\b.txt");
        fw.write("字符流");
        fw.write('g');
        fw.close();
    }
    @Test
    public void test3() throws Exception{
       FileReader fr = new FileReader("D:\\A流\\b.txt");
        int t;
        while((t = fr.read()) != -1){
            System.out.print((char)t);
        }
        fr.close();
    }

 /**
     * 读字符串的时候，一般都用BufferedReader来包装
     * 好处：
     * 1.加一个缓存，读取数据更快
     * 2.BufferedReader有readline方法读字符串很方便
     * @throws Exception
     */
    @Test
    public void test4() throws Exception{
       BufferedWriter bw = new BufferedWriter(
               new FileWriter("D:\\A流\\b.txt")
       );
       bw.write("Hello !");
       bw.flush();
       bw.close();
    }
    @Test
    public void test5() throws Exception{
       BufferedReader br = new BufferedReader(
               new FileReader("D:\\A流\\b.txt")
       );
        System.out.println(br.readLine());
       br.close();
    }