2019.3.8作业

1、对文件pet.template中的肉容进行替换，再输出到文件中

package com.java.work;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public abstract class WorkPet {
	public static void main(String[] args) {
		FileReader fr = null;
		BufferedReader br = null;
		
		FileWriter fw = null;
		BufferedWriter bw = null;
		try {
			//读取pet.template文件中的内容
			fr = new FileReader("pet.template");
			br = new BufferedReader(fr);
			String str = "";
			String s = new String();
			String news = new String();
			while((str = br.readLine())!=null) {
				System.out.println(str);
				//将读取出的来内容拼接到字符串s中
				s = s + str;
			}
			//替换s中的内容
			//替换前的内容
			System.out.println(s);
			news = s.replace("{name}", "1").replace("{type}", "2").replace("{master}", "3");
			//替换后的内容
			System.out.println(news);
			//将替换后的内容再次输出到pet.template文件中
			fw = new FileWriter("pet.template", true);
			bw = new BufferedWriter(fw);
			bw.newLine();
			bw.write(news);
			bw.flush();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			try {
				if(bw!=null) {
					bw.close();
				}
				if(fw!=null) {
					fw.close();
				}
				if(br!=null) {
					br.close();
				}
				if(fr!=null) {
					fr.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		
	}
}

　　替换前文本内空：

　　控制台输出：

　　替换后：

2、用序列化和反序列化写一个可以多次注册，并且可以用注册过的所有用户登录的功能

　　要求每次注册一个用户，当再次注册用户时，不能把之前注册过的用户覆盖掉

package com.java.worktwo;

import java.io.Serializable;
/**
 * 用户类
 * @author Administrator
 *
 */
public class User implements Serializable{
	private String name;
	private String password;
	private Long phoneNumber;
	
	public User() {}
	
	public User(String name, String password, Long phoneNumber) {
		this.name = name;
		this.password = password;
		this.phoneNumber = phoneNumber;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public Long getPhoneNumber() {
		return phoneNumber;
	}
	public void setPhoneNumber(Long phoneNumber) {
		this.phoneNumber = phoneNumber;
	}

	public String toString() {
		return "User [name=" + name + ", password=" + password + ", phoneNumber=" + phoneNumber + "]";
	}
}

package com.java.worktwo;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

/**
 * 用户登录
 * @author Administrator
 *
 */
public class UserLogin {
	static Scanner cxj = new Scanner(System.in);
	public static void main(String[] args) {
		List<User> list = new ArrayList<User>();
		FileInputStream fis = null;
		ObjectInputStream ois = null;

		try {
			fis = new FileInputStream("user.txt");
			if((fis.available())!=0) {
				ois = new ObjectInputStream(fis);
				list = (ArrayList<User>)ois.readObject();
			}else {
				System.out.println("当前无帐号信息！");
				System.out.println("请先注册！");
				return;
			}
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}finally {
			try {
				if(ois!=null) {
					ois.close();
				}
				if(fis!=null) {
					fis.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
			
		System.out.print("请输入用户名：");
		String name = cxj.next();
		System.out.print("请输入密码：");
		String password = cxj.next();

		int count = 0;
		for(User u : list) {
			if(name.equals(u.getName())&&(password.equals(u.getPassword()))) {
				System.out.println("登录成功！");
				break;
			}else {
				count++;
			}
		}
		if(count>=list.size()){
			System.out.println("登录失败！");
		}
	}
}

package com.java.worktwo;

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.util.ArrayList;
import java.util.List;
import java.util.Scanner;

/**
 * 用户注册
 * @author Administrator
 *
 */
public class UserRegister {
	static Scanner cxj = new Scanner(System.in);
	public static void main(String[] args) {
		List<User> list = new ArrayList<User>();

		FileInputStream fis = null;
		ObjectInputStream ois = null;

		try {
			fis = new FileInputStream("user.txt");
			if((fis.available())!=0) {
				ois = new ObjectInputStream(fis);
				list = (ArrayList<User>)ois.readObject();
			}else {
				System.out.println("当前无帐号信息！");
			}
			
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}finally {
			try {
				if(ois!=null) {
					ois.close();
				}
				if(fis!=null) {
					fis.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		FileOutputStream fos = null;
		ObjectOutputStream oos = null;

		System.out.print("请输入用户名：");
		String name = cxj.next();
		System.out.print("请输入密码：");
		String password = cxj.next();
		System.out.print("请输入手机号码：");
		Long phoneNumber = cxj.nextLong();

		User user = new User(name,password,phoneNumber);
		list.add(user);

		try {
			fos = new FileOutputStream("user.txt");
			oos = new ObjectOutputStream(fos);
			oos.writeObject(list);
			oos.flush();
			oos.close();
			System.out.println("注册成功！");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			try {
				if(oos!=null) {
					oos.close();
				}
				if(fos!=null) {
					fos.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}

　　用户几号信息记录文本：