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import java.io.*;

public class fileStreamTest2{
  public static void main(String[] args) throws IOException {

    File f = new File("a.txt");
    FileOutputStream fop = new FileOutputStream(f);
    // 构建FileOutputStream对象,文件不存在会自动新建

    OutputStreamWriter writer = new OutputStreamWriter(fop, "UTF-8");
    // 构建OutputStreamWriter对象,参数可以指定编码,默认为操作系统默认编码,windows上是gbk

    writer.append("中文输入");
    // 写入到缓冲区

    writer.append("\r\n");
    //换行

    writer.append("English");
    // 刷新缓存冲,写入到文件,如果下面已经没有写入的内容了,直接close也会写入

    writer.close();
    //关闭写入流,同时会把缓冲区内容写入文件,所以上面的注释掉

    fop.close();
    // 关闭输出流,释放系统资源

    FileInputStream fip = new FileInputStream(f);
    // 构建FileInputStream对象

    InputStreamReader reader = new InputStreamReader(fip, "UTF-8");
    // 构建InputStreamReader对象,编码与写入相同

    StringBuffer sb = new StringBuffer();
    while (reader.ready()) {
      sb.append((char) reader.read());
      // 转成char加到StringBuffer对象中
    }
    System.out.println(sb.toString());
    reader.close();
    // 关闭读取流

    fip.close();
    // 关闭输入流,释放系统资源

  }
}

import java.io.*;

public class Employee implements java.io.Serializable
{
   public String name;
   public String address;
   public transient int SSN; //当对象被序列化时，属性 SSN 的值为 111222333，但是因为该属性是短暂的，该值没有被发送到输出流。所以反序列化后 Employee 对象的 SSN 属性为 0。
   public int number;
   public void mailCheck()
   {
      System.out.println("Mailing a check to " + name
                           + " " + address);
   }
}

...

public class SerializeDemo
{
   public static void main(String [] args)
   {
      Employee e = new Employee();
      e.name = "Reyan Ali";
      e.address = "Phokka Kuan, Ambehta Peer";
      e.SSN = 11122333;
      e.number = 101;
      try
      {
         FileOutputStream fileOut =
         new FileOutputStream("/tmp/employee.ser");
         ObjectOutputStream out = new ObjectOutputStream(fileOut);
         out.writeObject(e);
         out.close();
         fileOut.close();
         System.out.printf("Serialized data is saved in /tmp/employee.ser");
      }catch(IOException i)
      {
          i.printStackTrace();
      }
   }
}

import java.io.*;

public class DeserializeDemo
{
   public static void main(String [] args)
   {
      Employee e = null;
      try
      {
         FileInputStream fileIn = new FileInputStream("/tmp/employee.ser");
         ObjectInputStream in = new ObjectInputStream(fileIn);
         e = (Employee) in.readObject(); // 注意，readObject() 方法的返回值被转化成 Employee 引用。
         in.close();
         fileIn.close();
      }catch(IOException i)
      {
         i.printStackTrace();
         return;
      }catch(ClassNotFoundException c)
      {
         System.out.println("Employee class not found");
         c.printStackTrace();
         return;
      }
      System.out.println("Deserialized Employee...");
      System.out.println("Name: " + e.name);
      System.out.println("Address: " + e.address);
      System.out.println("SSN: " + e.SSN);
      System.out.println("Number: " + e.number);
    }
}

// Java Program to illustrate reading from text file 
// as string in Java 
package io; 
import java.nio.file.*;; 
public class ReadTextAsString 
{ 
  public static String readFileAsString(String fileName)throws Exception 
  { 
    String data = ""; 
    data = new String(Files.readAllBytes(Paths.get(fileName))); 
    return data; 
  } 
  
  public static void main(String[] args) throws Exception 
  { 
    String data = readFileAsString("C:\\Users\\pankaj\\Desktop\\test.java"); 
    System.out.println(data); 
  } 
}