14.7 数据流

14.7 数据流

前面学习的IO流，在程序代码中，要么将数据直接按照字节处理，要么按照字符处理。那么，如果要在程序中直接处理Java的基础数据类型，怎么办呢？

String name = “巫师”;
int age = 300;
char gender = ‘男’;
int energy = 5000;
double price = 75.5;
boolean relive = true;

完成这个需求，可以使用DataOutputStream进行写，随后用DataInputStream进行读取，而且顺序要一致。

示例代码：

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class TestData {
    public void save() throws IOException{
        String name = "巫师";
        int age = 300;
        char gender = '男';
        int energy = 5000;
        double price = 75.5;
        boolean relive = true;

        DataOutputStream dos = new DataOutputStream(new FileOutputStream("game.dat"));
        dos.writeUTF(name);
        dos.writeInt(age);
        dos.writeChar(gender);
        dos.writeInt(energy);
        dos.writeDouble(price);
        dos.writeBoolean(relive);
        dos.close();
    }    
    public void reload()throws IOException{
        DataInputStream dis = new DataInputStream(new FileInputStream("game.dat"));
        String name = dis.readUTF();
        int age = dis.readInt();
        char gender = dis.readChar();
        int energy = dis.readInt();
        double price = dis.readDouble();
        boolean relive = dis.readBoolean();

        System.out.println(name+"," + age + "," + gender + "," + energy + "," + price + "," + relive);

        dis.close();
    }
}