ObjectInputStream与ObjectOutputStream

雇员类

package io;

import java.io.Serializable;

@SuppressWarnings("serial")
public class Emp implements Serializable{
    private Integer empno;
    private String ename;
    private String job;
    private double comm;
    private double sal;

    public Integer getEmpno() {
        return empno;
    }

    public void setEmpno(Integer empno) {
        this.empno = empno;
    }

    public String getEname() {
        return ename;
    }

    public void setEname(String ename) {
        this.ename = ename;
    }

    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job;
    }

    public double getComm() {
        return comm;
    }

    public void setComm(double comm) {
        this.comm = comm;
    }

    public double getSal() {
        return sal;
    }

    public void setSal(double sal) {
        this.sal = sal;
    }

    @Override
    public String toString() {
        return "Emp [empno=" + empno + ", ename=" + ename + ", job=" + job
                + ", comm=" + comm + ", sal=" + sal + "]";
    }
}

对象操作工具类

package io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class FileOperate {
    private File file = null; //通过外部设置文件路径

    public FileOperate(File file){ //可以直接接收File对象
        this.file = file;
    }
    public FileOperate (String path){
        this(new File(path));
    }

    /**
     *
     * 保存对象信息
     *
     * @param obj
     * @throws Exception
     */
    public void save(Object obj) throws Exception{
        ObjectOutputStream oos = null;
        try{
            if(!this.file.getParentFile().exists()){
                this.file.getParentFile().mkdirs();
            }
            oos = new ObjectOutputStream(new FileOutputStream(this.file));
            oos.writeObject(obj);
        }catch(Exception e){
            throw e;
        }finally{
            if(oos != null){
                oos.close();
            }
        }
    }

    /**
     *
     * 输出对象信息
     *
     * @return
     * @throws Exception
     */
    public Object load() throws Exception{
        ObjectInputStream ois = null;
        try{
            ois = new ObjectInputStream(new FileInputStream(this.file));
            return ois.readObject();
        }catch(Exception e){
            throw e;
        }finally{
            if(ois != null){
                ois.close();
            }
        }
    }
}

菜单类

package io;

import java.io.File;

public class EmpMenu {

    private static final String PATH = "d:" + File.separator + "mydemo";

    public void init(){ //对象初始化
        Emp vo = new Emp();
        vo.setEmpno(7369);
        vo.setEname("SMITH");
        vo.setJob("CLERK");
        vo.setSal(800.0);
        vo.setComm(0.0);
        FileOperate fo = new FileOperate(PATH);
        try {
            fo.save(vo);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void read(){ //读取对象信息
        FileOperate fo = new FileOperate(PATH);
        try{
            Emp emp = (Emp)fo.load();
            System.out.println(emp);

        }catch(Exception e){
            e.printStackTrace();
        }
    }

    public void change(){ //保存对象信息
        FileOperate fo = new FileOperate(PATH);
        try{
            Emp emp = (Emp)fo.load();
            emp.setEname("张三");
            emp.setSal(1000.0);
            System.out.println(emp);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

测试类

package io;

public class TestEmpMenu {

    public static void main(String[] args) {
        EmpMenu em = new EmpMenu();
        //em.init();
        em.change();
        em.read();
    }
}