输入输出流实例1 文件通讯录

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package unit6;
import java.util.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;

public class Person {
    private String name;
    private char sex;
    private String homePhone;
    private String officePhone;
    private String memo;
    public Person(){
        name="";
        sex='M';
    }
    public Person(String name){
        this.name=name;
    }
    public Person(String name,char sex,String homePhone){
        this.name=name;
        this.sex=sex;
        this.homePhone=homePhone;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public char getSex() {
        return sex;
    }
    public void setSex(char sex) {
        this.sex = sex;
    }
    public String getHomePhone() {
        return homePhone;
    }
    public void setHomePhone(String homePhone) {
        this.homePhone = homePhone;
    }
    public String getOfficePhone() {
        return officePhone;
    }
    public void setOfficePhone(String officePhone) {
        this.officePhone = officePhone;
    }
    public String getMemo() {
        return memo;
    }
    public void setMemo(String memo) {
        this.memo = memo;
    }
    public String toString(){
        String personinfo="=========================================\n";
        personinfo+="姓名："+name+" 性别:"+(sex=='M'?'男':'女')+"\n";
        personinfo+="电话（H）:"+homePhone+"\n";
        personinfo+="电话(O):"+officePhone+"\n";
        personinfo+="=============================================\n";
        return personinfo;
    }
    public void display(){
        System.out.println(toString());
    }
    public void writeToStream(BufferedWriter out)throws IOException{
        out.write(name+","+(sex=='M'?'男':'女')+",");
        if(homePhone!=null) out.write(homePhone+",");
        else out.write(",");
        if(officePhone!=null) out.write(officePhone+",");
        else out.write(",");
        if(memo!=null) out.write(memo);
        else out.newLine();
    }
    public boolean readFromStream(BufferedReader in)throws IOException{
        String str = in.readLine();
        if(str=="end.") return false;
        String[] info=str.split(",");
        this.setName(info[0]);
        this.setSex(info[1].charAt(0));
        if(info[2]!=null) this.setHomePhone(info[2]);
        if(info[3]!=null) this.setOfficePhone(info[3]);
        if(info[4]!=null) this.setMemo(info[4]);
        return true;
    }
    public void inputDate(){
        Scanner in = new Scanner(System.in);
        System.out.print("name:");if(in.hasNext()) setName(in.next());
        System.out.print("sex:(F/M)"); if(in.hasNext()) setSex(in.next().charAt(0));
        System.out.print("homePhoe:");if(in.hasNext()) setHomePhone(in.next());
        System.out.print("officePhone:");if(in.hasNext()) setOfficePhone(in.next());
        System.out.print("memo:");if(in.hasNext()) setMemo(in.next());
    }
    

}

 

 

package unit6;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class AddreBookTest {
    public static int displayMenu() {
        System.out.println("\t\t************************************");
        System.out.println("\t\t*  1------create a new one         *");
        System.out.println("\t\t*  2------show all                 *");
        System.out.println("\t\t*  3------exit                     *");
        System.out.println("\t\t************************************");

        try {
            int choice = System.in.read();
            System.in.skip(2);
            if (choice >= 49 && choice <= 52) {
                return choice - 48;
            } else {
                return 0;
            }
        } catch (IOException e) {
            System.out.println("ERROR!");
            return 0;

        }
    }
    public static void main(String[] args)throws Exception {
        int i;
        while(true){
            i=displayMenu();
            switch(i){
            case 1:
                newAddressBook(); break;
            case 2:
                displayAddressBook();break;
            case 3:
                System.exit(0);break;
            case 4:
            default:
            {System.out.println("chose error!");}
            
            }
            
        }
    }
    public static boolean yesno(String msg){
        Scanner keyin = new Scanner(System.in);
        System.out.println(msg);
        char ch = keyin.nextLine().charAt(0);
        if(ch=='y'||ch=='Y') return true;
        else return false;
    }
    public static void newAddressBook(){
        System.out.println("========>creat a new AddressBook<=========");
        System.out.println("attention: the maxnum of addressbook is no more than 200");
        Person[] addressbook = new Person[200];
        int i=0;
        boolean yesno =true;
        while(i<200){
            Person tmpPerson= new Person();
            tmpPerson.inputDate();
            yesno=yesno("are you sure?(y/n");
            if(yesno){
                addressbook[i]=tmpPerson;
            }else{
                System.out.println("please retry");
                continue;
            }
            yesno=yesno("continue?(y/n)");
            if(!yesno){
                break;
            }
            i++;
        }
        BufferedWriter addressFile =null;
        try{
            addressFile = new BufferedWriter(new FileWriter ("addressbook.txt"));
            for(int k=0;k<i;k++){
                addressbook[k].writeToStream(addressFile);
            }
        }catch(IOException e1){
                e1.printStackTrace();
            }finally{
                try{
                    if(addressFile!=null) addressFile.close();
                }catch (Exception e2) {

                    e2.printStackTrace();
                }
            }
            System.out.println("done!");
        }
    public  static void displayAddressBook(){
        Person[]addressbook=new Person[200];
        BufferedReader filein= null;
        try{
            filein = new BufferedReader(new FileReader("addressbook.txt"));
            int i=0;
            Person tmpPerson = new Person();
            boolean flag = tmpPerson.readFromStream(filein);
            while(flag){
                addressbook[i]=tmpPerson;
                addressbook[i].display();
                i++;
                tmpPerson=new Person();
                flag=tmpPerson.readFromStream(filein);
                
            }
            filein.close();
        }catch(IOException e1){
            e1.printStackTrace();
        }catch(Exception e2){
            e2.printStackTrace();
        }finally{
            try{
                if(filein!=null){
                    filein.close();
                }
            }catch(Exception e){
                
            }
        }
        System.out.println("通讯录显示结束");
    }
    }