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input output

MemberMain

콘솔에 메뉴를 출력하는 클래스

package hellomemberfile;

import java.util.Scanner;

public class MemberMain {

    // 저장 > File ./data/member.txt      

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        while(true) {
            System.out.println("== 메뉴 선택 ==");
            System.out.println("1. 회원 가입");
            System.out.println("2. 회원 목록 보기");
            System.out.println("3. 회원 정보 수정");
            System.out.println("4. 회원 삭제");
            System.out.println("5. 끝내기");

            String command = sc.next();

            MemberService ms = new MemberService();
            Action action = null;
            switch (command) {
            case "1":
                action = new AddAction();
                ms.process(action, sc);
                break;
            case "2":
                action = new ListAction();
                ms.process(action, sc);
                break;
            case "3":
                action = new UpdateAction();
                ms.process(action, sc);
                break;
            case "4":
                action = new DeleteAction();
                ms.process(action, sc);
                break;  

            }
            if(command.equals("5")) break;

        }

    }

}

MemberService

요청을 제어하는 서비스
실질적인 비즈니스 로직을 정의하는 Service

package hellomemberfile;

import java.util.Scanner;

public class MemberService {
    void process(Action action, Scanner sc) {
        action.execute(sc);
    }
}

MemberVo

회원 정보 저장

package hellomemberfile;

public class MemberVO {
    private String id;
    private String pw;
    private String name;
    private int age;

    public MemberVO() {
    }

    public MemberVO(String id, String pw, String name, int age) {
        super();
        this.id = id;
        this.pw = pw;
        this.name = name;
        this.age = age;
    }

    public String getId() {
        return id;
    }

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

    public String getPw() {
        return pw;
    }

    public void setPw(String pw) {
        this.pw = pw;
    }

    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;
    }

    @Override
    public String toString() {
        return id+"," + pw + "," + name + "," + age ;
    }   

}

Action

요청 처리 규격을 정의(인터페이스)
다형성 지원을 위해 사용

package hellomemberfile;

import java.util.Scanner;

public interface Action {
    void execute(Scanner sc);
}

각 액션들

AddAction

회원 가입 요청을 처리해 주는 클래스

package hellomemberfile;

import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class AddAction implements Action{

    @Override
    public void execute(Scanner sc) {
        System.out.println("AddAction");        
        System.out.println("== 회원 정보 입력 ==");
        System.out.print("ID >> ");
        String id = sc.next();
        System.out.print("PW >> ");
        String pw = sc.next();
        System.out.print("Name >> ");
        String name = sc.next();
        System.out.print("Age >> ");
        int age = sc.nextInt();     
        //System.out.printf("%s,%s,%s,%s\n",id,pw,name,age);

        String data = "";
        //1. MemberVO 를 사용한 저장 data
        MemberVO  member = new MemberVO(id, pw, name, age);
        data = member.toString()+"\n";
        //System.out.println(data);

        //2. 문자열 덧셈 data
        String de = ",";
        data = id + de + pw + de + name + de + age +"\n" ;
        //System.out.println(data);

        //3. String.join()
        String[] datas = new String[4];
        datas[0] = id;
        datas[1] = pw;
        datas[2] = name;
        datas[3] = age+"";
        data = String.join(",", datas)+"\n";
        //System.out.println(data);

        // File Save
        String file = "./data/member.txt";
        FileWriter fw = null;

        try {
            fw = new FileWriter(file, true); //true : append
            fw.write(data);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

}

ListAction

package hellomemberfile;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class ListAction implements Action{

    @Override
    public void execute(Scanner sc) {       
        System.out.println("ListAction");

        // File Read -> List
        // File 회원 정보 -> List
        FileReader fr = null;
        BufferedReader br = null;
        String file = "./data/member.txt";
        List members = new ArrayList();
        try {
            fr = new FileReader(file);
            br = new BufferedReader(fr);
            String str = null;
            while((str = br.readLine()) != null) {              
                members.add(str);
            }
        } catch (IOException e) {

            e.printStackTrace();
        }       

        // List -> Print
        System.out.println("현재 회원수 : " + members.size());
        // ID:hong, PW:1111, Name:홍길동, Age:11 
        for(String data : members) {
            System.out.println(data);
        }

        for(String data: members) {
            String[] dArr = data.split(",");
            String id = "ID:" + dArr[0];
            String pw = "PW:" + dArr[1];
            String name = "Name:" + dArr[2];
            String age= "Age:" + dArr[3];
            String[] mem = {id,pw,name,age};
            String sMem = String.join("*",mem);
            System.out.println(sMem);           
        }       
    }

}

UpdateAction

회원 정보 수정 처리

package hellomemberfile;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class UpdateAction implements Action{

    @Override
    public void execute(Scanner sc) {
        System.out.println("UpdateAction");     
        System.out.println("== 회원 정보 수정 ==");

        // File 회원 정보 -> List
        FileReader fr = null;
        BufferedReader br = null;       
        String file = "./data/member.txt";
        List rData = new ArrayList();
        try {
            fr = new FileReader(file);
            br = new BufferedReader(fr);
            String str = null;
            while((str = br.readLine()) != null) {              
                rData.add(str);
            }
        } catch (IOException e) {

            e.printStackTrace();
        } finally {
            try {
                fr.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        //List rData ==> List members
        List members = new ArrayList();
        MemberVO member = null;
        // String ==> MemberVO ==> add
        for(String data: rData) {
            MemberVO m = null;
            String[] dArr = data.split(",");
            String id = dArr[0];
            String pw = dArr[1];
            String name = dArr[2];
            int age = Integer.parseInt(dArr[3]);
            String email = dArr[4];
            String tel = dArr[5];
            m = new MemberVO(id, pw, name, age, email, tel);
            members.add(m);                         
        }   


        //  수정 ID 찾기
        System.out.print("수정할 ID >> "); // 33
        String id = sc.next();

        for(MemberVO m : members) {
            if(m.getId().equals(id)) {;
                member = m;
            }
        }

        if(member == null) {
            System.out.println("Member Not Found!!");
        }else {
            // 수정할 데이터 입력
            System.out.println("기존 PW >> " + member.getPw());
            System.out.print("PW >> ");
            String pw = sc.next();
            System.out.println("기존 Name >> " + member.getName());
            System.out.print("Name >> ");
            String name = sc.next();
            System.out.println("기존 Age >> " + member.getAge());
            System.out.print("Age >> ");
            int age = sc.nextInt();     
            //System.out.printf("%s,%s,%s,%s\n",id,pw,name,age);

            // 수정 작업
            member.setPw(pw);
            member.setName(name);
            member.setAge(age);


            // membesr List => File Write
            FileWriter fw = null;
            try {
                fw = new FileWriter(file);
                for(MemberVO m : members) {         
                    String data = m.toString()+"\n";
                    fw.write(data);
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    fw.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }                       
        }       
    }
}

DeleteAction

회원 정보 삭제 처리

package hellomemberfile;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class DeleteAction implements Action{

    @Override
    public void execute(Scanner sc) {
        System.out.println("DeleteAction");     
        System.out.println("== 회원 정보 삭제 ==");

        // File 회원 정보 -> List
        FileReader fr = null;
        BufferedReader br = null;       
        String file = "./data/member.txt";
        List rData = new ArrayList();
        try {
            fr = new FileReader(file);
            br = new BufferedReader(fr);
            String str = null;
            while((str = br.readLine()) != null) {              
                rData.add(str);
            }
        } catch (IOException e) {

            e.printStackTrace();
        } finally {
            try {
                fr.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        //List rData ==> List members
        List members = new ArrayList();
        MemberVO member = null;
        // String ==> MemberVO ==> add
        for(String data: rData) {
            String[] dArr = data.split(",");
            String id = dArr[0];
            String pw = dArr[1];
            String name = dArr[2];
            int age = Integer.parseInt(dArr[3]);
            member = new MemberVO(id, pw, name, age);
            members.add(member);                        
        }   

        //  삭제 ID Index 찾기
        System.out.print("삭제할 ID >> "); // 33
        String id = sc.next();

        //List members =  MemberMain.members;
        int deleteIndex = -1;
        for(int i=0; i File Write
            FileWriter fw = null;
            try {
                fw = new FileWriter(file);
                for(MemberVO m : members) {         
                    String data = m.toString()+"\n";
                    fw.write(data);
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    fw.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }   
        }
    }
}