I/O 3JAVA IO详解（字符流）-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_9280/article/details/82102715

本文通过三个示例展示了Java中使用I/O流进行基本的文件读写操作，包括文件输出、标准输入读取及文件读取。通过实例代码说明了如何使用FileOutputStream、FileInputStream、BufferedWriter、BufferedReader等类来实现这些操作。

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StreamTest

package com.test.io;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class StreamTest {
	public static void main(String[] args) throws IOException {
		
		FileOutputStream fos = new FileOutputStream("test.txt");
		OutputStreamWriter osw = new OutputStreamWriter(fos);
		BufferedWriter bw = new BufferedWriter(osw); //装饰模式
		
		bw.write("www.google.com");
		bw.write("\n");
		bw.write("www.baidu.com");
		bw.close();
		
		FileInputStream fis = new FileInputStream("test.txt");
		InputStreamReader isr = new InputStreamReader(fis);
		BufferedReader br = new BufferedReader(isr);
		String str = br.readLine();
		while(str != null){
			System.out.println(str);
			str = br.readLine();
		}
	}
}

package com.test.io;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class StreamTest2 {
	public static void main(String[] args)throws IOException {
		//System.in表示从标准输入设备上读取输入
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);

		String str = br.readLine();
		while(null != str){
			System.out.println(str);
			str = br.readLine();
		}
		br.close();
	}
}

package com.test.io;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class FildReadTest{
	public static void main(String[] args)throws IOException {
		FileReader fr = new FileReader("test.txt");
		BufferedReader br = new BufferedReader(fr);
		String str = br.readLine();
		while(str != null){
			System.out.println(str);
			str = br.readLine();
		}
		br.close();
	}
}

package com.test.io;

import java.io.IOException;
import java.io.RandomAccessFile;

public class RandomAccessFileTest {
	public static void main(String[] args) throws IOException {
		Person person1 = new Person("zhangsan",11,1.68);
		RandomAccessFile raf = new RandomAccessFile("person.txt","rw");
		person1.write(raf);
		
		raf.seek(0);//让读的位置重新回到文件开关
		
		Person person2 = new Person();
		person2.read(raf);
		System.out.println(person2.getName());
		System.out.println(person2.getAge());
		System.out.println(person2.getHeight());
	}
}
class Person{
	private String name;
	private int age;
	private double height;
	
	public Person(){
	}
	
	public Person(String name,int age,double height){
		this.name = name;
		this.age = age;
		this.height = height;
	}
	
	public void write(RandomAccessFile raf) throws IOException{
		raf.writeInt(age);
		raf.writeUTF(name);
		raf.writeDouble(height);
	}
	
	public void read(RandomAccessFile raf)throws IOException{
		this.age = raf.readInt();
		this.name = raf.readUTF();
		this.height = raf.readDouble();
		
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public double getHeight() {
		return height;
	}

	public void setHeight(double height) {
		this.height = height;
	}
}