java读写文件常用方法

package cn.youhap.headfirst.H15;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

public class ReadAndWriteFile {

    public static void main(String[] args) {
        ReadAndWriteFile readAndWriteFile = new ReadAndWriteFile();
        try {
            readAndWriteFile.readAndWriteTextFile();
            readAndWriteFile.readAndWriteBinFile();
            readAndWriteFile.readAndWriteObjectFile();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    // 读写普通的txt文件
    public void readAndWriteTextFile() throws IOException {
        File file = new File("C:\\testDir\\p.txt");
        BufferedReader br = null;
        BufferedWriter bw = null;
        // read
        try {
            FileReader reader = new FileReader(file);
            br = new BufferedReader(reader);

            FileWriter writer = new FileWriter(new File("C:\\testDir\\p2.txt"));
            bw = new BufferedWriter(writer);

            String line = null;
            StringBuffer sb = new StringBuffer();
            while ((line = br.readLine()) != null) {
                sb.append(line + "\r\n");
            }
            bw.write(sb.toString());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            bw.flush();
            br.close();
            bw.close();
        }
    }

    // 读写二进制文件
    public void readAndWriteBinFile() throws IOException {
        // read a jpeg file
        File file = new File("C:\\testDir\\qq.PNG");
        FileInputStream fis;
        BufferedInputStream bis = null;

        FileOutputStream fos;
        BufferedOutputStream bos = null;
        try {
            fis = new FileInputStream(file);
            bis = new BufferedInputStream(fis);

            fos = new FileOutputStream(new File("C:\\testDir\\qq2.PNG"));
            bos = new BufferedOutputStream(fos);
            byte[] b = new byte[1024];
            int counter = 0;
            while ((counter = bis.read(b, 0, b.length)) != -1) {
                fos.write(b, 0, counter);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            bos.flush();
            bis.close();
            bos.close();
        }
    }

    // 读写序列化对象
    public void readAndWriteObjectFile() throws IOException,
            ClassNotFoundException {
        // write object
        File file = new File("C:\\testDir\\person.ser");
        FileOutputStream fos = new FileOutputStream(file);
        ObjectOutputStream oos = new ObjectOutputStream(fos);

        Person p1 = new Person();
        p1.setName("bbb");
        p1.setAge(33);
        p1.setHeight(172);

        Person p2 = new Person();
        p2.setName("aaaa");
        p2.setAge(30);
        p2.setHeight(160);

        ArrayList<Person> pList = new ArrayList<Person>();
        pList.add(p1);
        pList.add(p2);

        oos.writeObject(pList);
        oos.flush();

        // reade object list
        FileInputStream fis = new FileInputStream(file);
        ObjectInputStream ois = new ObjectInputStream(fis);
        pList = ((ArrayList<Person>) ois.readObject());
        StringBuffer sb = new StringBuffer();
        for (Person p : pList) {
            sb.append("name: " + p.getName() + ", ");
            sb.append("age: " + p.getAge() + ", ");
            sb.append("height: " + p.getHeight());
            sb.append("\r\n");
        }

        System.out.println(sb);
    }
}

package cn.youhap.headfirst.H15;

import java.io.Serializable;

public class Person implements Serializable {
    private static final long serialVersionUID = -6907689374622606005L;
    private int age;
    private transient int Height;
    private String Name ;
    public int getAge() {
        return age;
    }
    public int getHeight() {
        return Height;
    }
    public String getName() {
        return Name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public void setHeight(int height) {
        Height = height;
    }
    public void setName(String name) {
        Name = name;
    }
}