*21일차 실습

[실습문제 1]
 - 패키지 : com.io.test1
 - 클래스 : Test1
>> main() 포함
=> fileSave() 메소드 실행함

>> 메소드 추가함
+ fileSave() : void
=> 키보드로 사용할 파일명을 입력받음
BufferedReader의 readLine() 사용함
=> 파일출력용 스트림 객체 생성함
FileWriter 사용함
=> 화면에 "파일에 저장할 내용을 입력하시오." 출력
입력값을 읽어들여서 바로 파일에 기록 저장처리
반복실행함
=> "exit"가 입력되면, 반복은 종료하고
화면에 "파일에 성공적으로 저장되었습니다." 출력하고
=> 파일출력 스트림을 닫음.

 

	private void filesave() {
		InputStream is = System.in;
		InputStreamReader isr =new InputStreamReader(is);
		BufferedReader br =new BufferedReader(isr);
		
		String filename =null;
		
		try {
			System.out.println("파일명 입력");
			filename=br.readLine();
			BufferedWriter fw  = new BufferedWriter(new FileWriter(filename,true));
	
			while(true) {
				System.out.print("파일에 저장할 내용을 입력하시오:  ");
				String data = br.readLine();
				if(data.equals("exit")) {
					fw.close();
					break;
				}else {
					fw.write(data+"\n");
					fw.flush();
				}
			}

		System.out.println("파일에 성공적으로 저장되었습니다.");
		}catch(IOException e) {
			e.printStackTrace();
		}

		
	}

 

 

 

 

[실습문제 2]
 - 위에서 작성한 클래스에 메소드 추가함
  >> 메소드
+ fileRead() : void
=> 키보드로 읽을 대상파일명을 입력받음
=> 파일 읽기용 스트림 객체 생성함 : FileReader 사용
=> 파일 안의 내용을 읽어서, StringBuilder 에 보관함
=> 다 읽은 다음, StringBuilder 에 보관된 값을 
   String으로 바꾸어 화면에 출력함

public class Test1 {

	public static void main(String[] args) {
		Test1 test = new Test1();
		test.filesave();
		test.fileRead();
	}

	public void fileRead() {
			FileReader fr = null;
			BufferedReader fbr = null;
			String fileName = null;

			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			System.out.print("> 읽어올 파일명을 입력하세요 : ");

			try {
				fileName = br.readLine();

				// FileReader는 파일에 읽기용 문자기반스트림.
				fbr = new BufferedReader(new FileReader("test1/" + fileName));

				// 읽어온 데이터를 담을 정수형변수
				String data = null;

				StringBuilder sb = new StringBuilder();
				while ((data = fbr.readLine()) != null) {
					System.out.println(data);
					sb.append(data);
					sb.append("\n");
				}

				// 출력
				System.out.println(sb.toString());

			} catch (FileNotFoundException e) {
				System.out.println("[" + fileName + "] 해당파일을 찾을 수 없습니다. ");
			} catch (IOException e) {
				e.printStackTrace();
			} finally {
				try {
					fbr.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

[실습문제 3]
 - 클래스 : 07_OOP프로젝트 com.oop.employee.model.vo.Employee 복사
-> com.io.employee.model.vo.Employee생성.
 - 실행용클래스 : com.io.employee.run.EmployeeTest
메소드 : saveEmployee();
=> Employee객체배열을 사용할 것.
=> 3개의 Employee객체생성후 ObjectOutputStream을 통해서 empoloyee.dat에 쓰기.


메소드 : loadEmployee();
=> employee.dat 파일의 내용을 ObjectInputStream을 이용해서 읽어와
=> Employee 객체에 저장하고
=> 화면 출력 확인함

 

package com.io.employee.run;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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 com.io.employee.model.vo.Employee;

/**
 * [실습문제 3]
 * <p>
 * - 클래스 : 07_OOP프로젝트 com.oop.employee.model.vo.Employee 복사 ->
 * com.io.employee.model.vo.Employee생성. - 실행용클래스 :
 * com.io.employee.run.EmployeeTest 메소드 : saveEmployee(); => Employee객체배열을 사용할
 * 것. => 5개의 Employee객체생성후 DataOutputStream을 통해서 empoloyee.dat에 쓰기.
 *
 * <p>
 * 메소드 : loadEmployee(); => employee.dat 파일의 내용을 데이터 종류별로 읽어서 => Employee 객체에
 * 저장하고 => 화면 출력 확인함
 *
 * 
 *
 */
public class EmployeeTest {

	public static void main(String[] args) {
		saveEmployee();
		loadEmployee();
	}

	public static void loadEmployee() {
		Employee[] empArr = new Employee[5];
		try (ObjectInputStream ois = new ObjectInputStream(
				new BufferedInputStream(new FileInputStream("emp/employee.dat")))) {
			for (int i = 0; i < empArr.length; i++) {
				empArr[i] = (Employee) ois.readObject();
			}
		} catch (IOException | ClassNotFoundException e) {
			e.printStackTrace();
		}

		// 확인
		for (int i = 0; i < empArr.length; i++) {
			empArr[i].printEmployee();
		}
	}

	public static void saveEmployee() {
		Employee[] empArr = new Employee[5];
		empArr[0] = new Employee(0, "제갈량", '남', "010-3131-3131", "영업부", 30000000, 0.15);
		empArr[1] = new Employee(1, "조자룡", '남', "010-8901-2345", "영업부", 20000000, 0.1);
		empArr[2] = new Employee(2, "유비", '남', "010-1234-5678", "영업부", 50000000, 0.2);
		empArr[3] = new Employee(3, "조조", '남', "010-5454-4545", "영업부", 34000000, 0.05);
		empArr[4] = new Employee(4, "초선", '여', "010-8787-7878", "영업부", 24000000, 0.1);

		try (ObjectOutputStream oos = new ObjectOutputStream(
				new BufferedOutputStream(new FileOutputStream("emp/employee.dat")))) {
			for (int i = 0; i < empArr.length; i++) {
				Employee emp = empArr[i];
				oos.writeObject(emp);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		System.out.println("직원저장완료!");

	}

}
--------------------------------------------
package com.io.employee.model.vo;

import java.io.Serializable;

public class Employee implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	private int empNo;
	private String name;
	private char gender;
	private String phone;
	private String dept;
	private int salary;
	private double bonusPct;
	
	
	
	public Employee(){}
	
	public Employee(int empNo, String name, char gender, String phone) {
		super();
		this.empNo = empNo;
		this.name = name;
		this.gender = gender;
		this.phone = phone;
	}
	public Employee(int empNo, String name, char gender, String phone, String dept, int salary, double bonusPct) {
		super();
		this.empNo = empNo;
		this.name = name;
		this.gender = gender;
		this.phone = phone;
		this.dept = dept;
		this.salary = salary;
		this.bonusPct = bonusPct;
	}
	
	public void printEmployee(){
		System.out.printf("%d, %s, %c, %s, %s, %d, %f%n", empNo, name, gender, phone, dept, salary, bonusPct);
	}
	
	
	public int getEmpNo() {
		return empNo;
	}
	public void setEmpNo(int empNo) {
		this.empNo = empNo;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public char getGender() {
		return gender;
	}
	public void setGender(char gender) {
		this.gender = gender;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public String getDept() {
		return dept;
	}
	public void setDept(String dept) {
		this.dept = dept;
	}
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}
	public double getBonusPct() {
		return bonusPct;
	}
	public void setBonusPct(double bonusPct) {
		this.bonusPct = bonusPct;
	}
	
	
}