Java实现单人信息管理程序

package Chapter_9;

import java.io.*;

//此类专门用于保存和读取对象
public class FileOperate {
 private File file = null;//定义一个文件对象
 public FileOperate(String pathName){//通过构造方法传递文件路径
 this.file = new File(pathName);//实例化File对象
 }
 public boolean save(Object obj) throws Exception{//可以保存对象
 ObjectOutputStream oos = null;//对象输出流
 boolean flag = false;//定义操作标志位
 try{
  oos = new ObjectOutputStream(new FileOutputStream(this.file));//实例化对象输出流
  oos.writeObject(obj);//保存对象
  flag = true;
 }catch (Exception e){
  throw e;//有异常抛出
 }finally {
  if (oos != null){//判断对象输出流对象是否被实例化
  oos.close();//不管是否有异常都要关闭
  }
 }
 return flag;
 }
 public Object load()throws Exception{//读取对象
 Object obj = null;//接收保存的对象
 ObjectInputStream ois = null;//声明对象输入流
 try{
  ois = new ObjectInputStream(new FileInputStream(this.file));//实例化对象输入流
  obj = ois.readObject();//读取对象
 }catch (Exception e){
  throw e;
 }finally {
  if (ois !=null){//判断输入流是否被实例化
  ois.close();//关闭输入流
  }
 }
 return obj;
 }

}

import java.io.*;

public class Person implements Serializable {//此类的对象可以被序列化
 private String name;
 private int age;
 public Person(String name,int age){//通过构造方法设置属性内容
 this.name = name;
 this.age = age;
 }
 public String toString(){
 return "姓名：" + this.name + "; 年龄：" + this.age;
 }

 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;
 }
}

package Chapter_9;

public class Operate {
 public static void add(){//增加数据操作
 InputData input = new InputData();//实例化输入数据对象
 FileOperate fo = new FileOperate("D://test.txt");
 String name = input.getString("请输入姓名：");
 int age = input.getInt("请输入年龄：","年龄必须是数字！");
 Person per = new Person(name,age);//实例化 Person 对象
 try {
  fo.save(per);//保存对象
 }catch (Exception e){
  e.printStackTrace();
 }
 System.out.println("信息增加成功");
 }
 public static void delete(){//删除数据操作
 FileOperate fo = new FileOperate("D://test.txt");
 try{
  fo.save(null);//清除对象
 }catch (Exception e){
  e.printStackTrace();
 }
 System.out.println("信息删除成功！");
 }
 public static void update(){//修改数据操作
 InputData input = new InputData();//实例化输入数据对象
 FileOperate fo = new FileOperate("D:\\test.txt");
 Person per = null;
 try{
  per = (Person)fo.load();//读取数据
 }catch (Exception e1){
  e1.printStackTrace();
 }
 String name = input.getString("请输入新的姓名（原姓名：" + per.getName() + "):");
 int age = input.getInt("请输入是新的年龄（原年龄：" +
  per.getAge() + ")","年龄必须是数字！");
 per = new Person(name,age);//重新实例化对象
 try{
  fo.save(per);//重新保存对象
 }catch (Exception e){
  e.printStackTrace();
 }
 System.out.println("信息更新成功");
 }
 public static void find(){
 FileOperate fo = new FileOperate("D:\\test.txt");
 Person per = null;
 try{
  per = (Person)fo.load();//读取对象
 }catch (Exception e1){
  e1.printStackTrace();
 }
 System.out.println(per);
 }
}