【Java】Java原生的序列化和反序列化

写一个Java原生的序列化和反序列化的DEMO。

需序列化的类：

package com.nicchagil.nativeserialize;

import java.io.Serializable;

public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    private Integer id;
    private String userName;
    
    public User(Integer id, String userName) {
        super();
        this.id = id;
        this.userName = userName;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public static long getSerialversionuid() {
        return serialVersionUID;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        result = prime * result
                + ((userName == null) ? 0 : userName.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        User other = (User) obj;
        if (id == null) {
            if (other.id != null)
                return false;
        } else if (!id.equals(other.id))
            return false;
        if (userName == null) {
            if (other.userName != null)
                return false;
        } else if (!userName.equals(other.userName))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", userName=" + userName + "]";
    }

}

工具类：

package com.nicchagil.nativeserialize;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class NativeSerializeTools {

    /**
     * 序列化
     * @param filePath 序列化的路径
     * @param s 序列化的对象
     */
    public static void write(String filePath, Serializable s) throws FileNotFoundException, IOException {
        if (filePath == null || filePath.length() == 0) {
            throw new RuntimeException("请传入序列化路径");
        }
        
        if (s == null) {
            throw new RuntimeException("请传入序列化对象");
        }
        
        File f = new File(filePath);
        
        ObjectOutputStream oos = null;
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(f);
            oos = new ObjectOutputStream(fos);
            oos.writeObject(s);
            System.out.println("finish.");
        } finally {
            if (oos != null) {
                oos.close();
            }
            if (fos != null) {
                fos.close();
            }
            System.out.println("close the resource.");
        }
    }
    
    /**
     * 反序列化
     * @param filePath 反序列化的路径
     * @return 反序列化的对象
     */
    public static Object read(String filePath) throws ClassNotFoundException, FileNotFoundException, IOException {
        if (filePath == null || filePath.length() == 0) {
            throw new RuntimeException("请传入反序列化路径");
        }
        
        File f = new File(filePath);
        
        ObjectInputStream ois = null;
        FileInputStream fis = null;
        Object o = null;
        try {
            fis = new FileInputStream(f);
            ois = new ObjectInputStream(fis);
            o = ois.readObject();
            System.out.println("finish.");
        } finally {
            if (ois != null) {
                ois.close();
            }
            if (fis != null) {
                fis.close();
            }
            System.out.println("close the resource.");
        }
        
        return o;
    }

}

测试类：

package com.nicchagil.nativeserialize;

import java.io.FileNotFoundException;
import java.io.IOException;

import org.junit.Assert;
import org.junit.Test;

public class HowToUse {
    
    private User user = new User(100, "Nick Huang");
    private String filePath = "d:/user.txt";
    
    @Test
    public void c1() throws FileNotFoundException, IOException {
        NativeSerializeTools.write(filePath, user);
    }
    
    @Test
    public void c2() throws FileNotFoundException, IOException, ClassNotFoundException {
        Object o = NativeSerializeTools.read(filePath);
        
        System.out.println(o);
        Assert.assertTrue(user.equals(o));
    }

}

日志：

finish.
close the resource.
finish.
close the resource.
User [id=100, userName=Nick Huang]