输入输出流实例1 文件通讯录

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");
}
}