Java读取文件

基本方法：

String filePath="D:\test\abc.txt";
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath)));
　　String data = null;
　　while((data = br.readLine())!=null)
　　{
　　　System.out.println(data); 
　　}
br.close()

若要指定文件的字符编码来读取，则需要使用InputStreamReader的另一个构造函数，加上字符编码：

//说明文件的编码为GB2312字符集
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath),"GB2312"));
//说明文件的编码为UTF-8字符集
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath),"UTF-8"));

写入数据：

public static void write(String filePath, String data)
    {
        try
        {
            File file = new File(filePath);
            if (!file.exists())
            {
                file.createNewFile();
            }
            else
            {
                FileOutputStream out = new FileOutputStream(file, true);
                byte[] bt = data.getBytes("utf-8");
                out.write(bt);
                //以下代码用于追加换行符
                byte[] c = new byte[2];
                c[0] = 0x0d;
                c[1] = 0x0a;// 用于输入换行符的字节码
                String t = new String(c);
                out.write(t.getBytes("utf-8"));
                out.close();
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

关于字符编码，即其他读取、写入、追加、保存操作,待续