[零基础学JAVA]Java SE实战开发-37.MIS信息管理系统实战开发[文件保存]（2）

MIS信息管理系统实战开发之单独使用文件实现保存

开发背景

ID、姓名、年龄为公共信息，而学生有成绩，工人有工资

定义一个抽象类Person（ID、姓名、年龄），学生是其子类，有成绩，工人是其子类有工资

ID如何定义呢？
ID最好可以自己生成，最好的方式是采用下面的编码方式：
· 标记 + 时间戳 + 三位随机数
· 例如：2009年3月22 20:10:10.345
· 学生的标记为s，工人的标记为w
· 生成的ID号： 学生 --> s20090322201010345023
                           工人 --> w20090322201010345023
因为现在的程序要满足文件和数据库的操作标准，所以此处应该定义出一个公共的标准 —— 接口
查询信息的时候可以进行排序操作，可以使用Comparable接口完成。

整个代码中牵扯到数据层的操作
· 数据层就是指真实的数据操作 --> CRUD。
· 最终结果操作的肯定是一个人（人为工人和学生）
应该进行分开，一个是全部的学生管理，一个是全部的工人管理。
数据层操作标准定义完成之后，有两种选择，一种是直接使用子类实现，但是以后的修改不是很方便，
所以此处最好使用代理设计的思路完成，做一个中间层。
代码关系：
Main --> Menu --> PersonOperate --> DAO

因为程序即要求使用文件保存，又要求使用数据库保存，所以此处可以设计出一个工厂，通过此工厂进行DAO的操作子类实例取得。

 

###################Michael分割线#####################

 

WorkerOperate.java 

package org.michael.demo.operate;    

import java.util.Iterator;    

import org.michael.demo.dao.PersonDAO;    
import org.michael.demo.factory.DAOFactory;    
import org.michael.demo.util.InputData;    
import org.michael.demo.util.TimeStamp;    
import org.michael.demo.vo.Person;    
import org.michael.demo.vo.Worker;    

public class WorkerOperate implements PersonOperate {    
         private PersonDAO dao = null;    
         private InputData input = null;    

         public WorkerOperate() {    
                 this.dao = DAOFactory.getPersonDAOInstance( "worker.ser");    
                 this.input = new InputData();    
        }    

         public void add() {    
                String id = new TimeStamp( "w").getTimeStampRandom();    
                System.out.print( "输入工人姓名：");    
                String name = this.input.getString();    
                System.out.print( "输入工人年龄：");    
                 int age = this.input.getInt();    
                System.out.print( "输入工人工资：");    
                 float salary = this.input.getFloat();    
                Worker w = new Worker(id, name, age, salary);    
                 try {    
                         this.dao.doCreate(w);    
                } catch (Exception e) {    
                        e.printStackTrace();    
                }    
        }    

         public void delete() {    
                String id = null;    
                System.out.print( "请输入要删除的工人ID：");    
                id = input.getString();    
                 try {    
                         this.dao.doDelete(id);    
                } catch (Exception e) {    
                        e.printStackTrace();    
                }    
        }    

         public void update() {    
                 // 更新之前需要先查询出来    
                String id = null;    
                System.out.print( "请输入要修改的工人ID：");    
                id = input.getString();    
                Worker w = null;    
                 try {    
                        w = (Worker) this.dao.findById(id);    
                } catch (Exception e1) {    
                         // TODO Auto-generated catch block    
                        e1.printStackTrace();    
                }    
                System.out.print( "输入工人姓名（原姓名：" + w.getName() + "）：");    
                String name = this.input.getString();    
                System.out.print( "输入工人年龄（原年龄：" + w.getAge() + "）：");    
                 int age = this.input.getInt();    
                System.out.print( "输入工人工资（原工资：" + w.getSalary() + "）：");    
                 float salary = this.input.getFloat();    
                w.setName(name);    
                w.setAge(age);    
                w.setSalary(salary);    
                 try {    
                         this.dao.doUpdate(w);    
                } catch (Exception e) {    
                        e.printStackTrace();    
                }    
        }    

         public void findAll() {    
                Iterator iter = null;    
                 try {    
                        iter = this.dao.findAll().iterator();    
                } catch (Exception e) {    
                        e.printStackTrace();    
                }    
                System.out.println( "ID\t\t\t姓名\t年龄\t工资");    
                 while (iter.hasNext()) {    
                        System.out.println(iter.next());    
                }    

        }    

         public void findByLike() {    
                String keyWord = null ;    
                System.out.print( "请输入查询关键字：") ;    
                keyWord = this.input.getString() ;    
                Iterator iter = null;    
                 try {    
                        iter = this.dao.findByLike(keyWord).iterator();    
                } catch (Exception e) {    
                        e.printStackTrace();    
                }    
                System.out.println( "ID\t\t\t姓名\t年龄\t工资");    
                 while (iter.hasNext()) {    
                        System.out.println(iter.next());    
                }    
        }    
}

 

PersonDAOProxyFile.java

package org.michael.demo.proxy;    

import java.util.Set;    

import org.michael.demo.dao.PersonDAO;    
import org.michael.demo.dao.impl.PersonDAOImplFile;    
import org.michael.demo.vo.Person;    

public class PersonDAOProxyFile implements PersonDAO {    
         private PersonDAO dao = null;    

         public PersonDAOProxyFile(String fileName) {    
                PersonDAOImplFile.fileName = fileName;    
                 this.dao = new PersonDAOImplFile();    
        }    

         public boolean doCreate(Person person) throws Exception {    
                 return this.dao.doCreate(person);    
        }    

         public boolean doDelete(String id) throws Exception {    
                 return this.dao.doDelete(id);    
        }    

         public boolean doUpdate(Person person) throws Exception {    
                 return this.dao.doUpdate(person);    
        }    

         public Set findAll() throws Exception {    
                 return this.dao.findAll();    
        }    

         public Person findById(String id) throws Exception {    
                 return this.dao.findById(id);    
        }    

         public Set findByLike(String keyWord) throws Exception {    
                 return this.dao.findByLike(keyWord);    
        }    

}

 

InputData.java 

package org.michael.demo.util;    

//输入数据的操作类    
import java.io.BufferedReader;    
import java.io.IOException;    
import java.io.InputStreamReader;    

public class InputData {    
         private BufferedReader buf = null;    

         public InputData() {    
                buf = new BufferedReader( new InputStreamReader(System.in));    
        }    

         public int getInt() {    
                 int temp = 0;    
                 // 如果输入的不是数字，至少应该有一个提示，告诉用户输入错了    
                 // 可以使用正则验证    
                String str = null;    
                 boolean flag = true;    
                 while (flag) {    
                         // 输入数据    
                        str = this.getString();    
                         if (!(str.matches( "\\d+"))) {    
                                 // 如果不是一个数字，则必须重新输入    
                                System.out.print( "输入的内容，必须是整数，请重新输入：");    
                        } else {    
                                 // 是一个正确的数字，则可以进行转换    
                                temp = Integer.parseInt(str);    
                                 // 表示退出循环    
                                flag = false;    
                        }    
                }    
                 return temp;    
        }    

         public String getString() {    
                String str = null;    
                 try {    
                        str = buf.readLine();    
                } catch (IOException e) {    
                        e.printStackTrace();    
                }    
                 return str;    
        }    

         public float getFloat() {    
                 float f = 0.0f;    
                String str = null;    
                 boolean flag = true;    
                 while (flag) {    
                         // 输入数据    
                        str = this.getString();    
                         if (!(str.matches( "\\d+.?\\d{1,2}"))) {    
                                 // 如果不是一个数字，则必须重新输入    
                                System.out.print( "输入的内容，必须是小数（小数点后只到两位），请重新输入：");    
                        } else {    
                                 // 是一个正确的数字，则可以进行转换    
                                f = Float.parseFloat(str);    
                                 // 表示退出循环    
                                flag = false;    
                        }    
                }    
                 return f;    
        }    
}

 

TimeStamp.java

package org.michael.demo.util;    

import java.util.Calendar;    
import java.util.GregorianCalendar;    
import java.util.Random;    

// 取得时间戳的类    
public class TimeStamp {    
         private Calendar calendar = null;    
         // 此标记有外部决定    
         private String flag = null;    

         public TimeStamp() {    
                 this.calendar = new GregorianCalendar();    
        }    

         public TimeStamp(String flag) {    
                 this() ;    
                 this.flag = flag;    
        }    

         public String getTimeStamp() {    
                StringBuffer buf = new StringBuffer();    
                 if ( this.flag != null) {    
                        buf.append( this.flag);    
                }    
                buf.append( this.addZero(calendar.get(Calendar.YEAR), 4));    
                buf.append( this.addZero(calendar.get(Calendar.MONTH) + 1, 2));    
                buf.append( this.addZero(calendar.get(Calendar.DAY_OF_MONTH), 2));    
                buf.append( this.addZero(calendar.get(Calendar.HOUR_OF_DAY), 2));    
                buf.append( this.addZero(calendar.get(Calendar.MINUTE), 2));    
                buf.append( this.addZero(calendar.get(Calendar.SECOND), 2));    
                buf.append( this.addZero(calendar.get(Calendar.MILLISECOND), 3));    
                 return buf.toString();    
        }    

         public String getTimeStampRandom() {    
                StringBuffer buf = new StringBuffer();    
                Random r = new Random();    
                buf.append( this.getTimeStamp());    
                buf.append(r.nextInt(10));    
                buf.append(r.nextInt(10));    
                buf.append(r.nextInt(10));    
                 return buf.toString();    
        }    

         // 可以单独设置一个加“0”的操作    
         private String addZero( int temp, int len) {    
                String str = temp + "";    
                 while (str.length() < len) {    
                        str = "0" + str;    
                }    
                 return str;    
        }    
}

 

Person.java

package org.michael.demo.vo;    

import java.io.Serializable;    

public abstract class Person implements Comparable,Serializable {    
         // 定义各公共属性    
         private String id ;    
         private String name ;    
         private int age ;    
         public Person(String id,String name, int age){    
                 this.setId(id) ;    
                 this.setName(name) ;    
                 this.setAge(age) ;    
        }    
         public String getId() {    
                 return id;    
        }    
         public void setId(String id) {    
                 this.id = id;    
        }    
         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;    
        }    
}

 

Student.java

package org.michael.demo.vo;    

public class Student extends Person {    
         private static final long serialVersionUID = 1L;    
         private float score;    

         public Student(String id, String name, int age, float score) {    
                 super(id, name, age);    
                 this.setScore(score);    
        }    

         public int compareTo(Object arg0) {    
                Student s = (Student) arg0;    
                 if ( this.score < s.score) {    
                         return 1;    
                } else if ( this.score > s.score) {    
                         return -1;    
                } else {    
                         if ( super.getAge() < s.getAge()) {    
                                 return -1;    
                        } else if ( super.getAge() > s.getAge()) {    
                                 return 1;    
                        } else {    
                                 return 0;    
                        }    
                }    
        }    

         public String toString() {    
                 return this.getId() + "\t" + this.getName() + "\t" + this.getAge() + "\t" + this.score;    
        }    

         public float getScore() {    
                 return score;    
        }    

         public void setScore( float score) {    
                 this.score = score;    
        }    

}

 

Worker.java

package org.michael.demo.vo;    

public class Worker extends Person {    
         private static final long serialVersionUID = 1L;    
         private float salary;    

         public Worker(String id, String name, int age, float salary) {    
                 super(id, name, age);    
                 this.setSalary(salary);    
        }    

         public int compareTo(Object arg0) {    
                Worker w = (Worker) arg0;    
                 if ( this.salary < w.salary) {    
                         return 1;    
                } else if ( this.salary > w.salary) {    
                         return -1;    
                } else {    
                         if ( super.getAge() < w.getAge()) {    
                                 return -1;    
                        } else if ( super.getAge() > w.getAge()) {    
                                 return 1;    
                        } else {    
                                 return 0;    
                        }    
                }    
        }    

         public String toString() {    
                 return this.getId() + "\t" + this.getName() + "\t" + this.getAge()    
                                + "\t" + this.salary;    
        }    

         public float getSalary() {    
                 return salary;    
        }    

         public void setSalary( float salary) {    
                 this.salary = salary;    
        }    

}

 

测试：

新增学生测试：

 

查询学生测试：

 

修改学生信息测试：

 

删除学生信息测试：

###################Michael分割线#####################

这季研究的是使用单独文件实现保存信息的MIS信息管理系统,下季研究使用数据库来保存信息哈~~~

###################Michael分割线#####################

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###################Michael分割线#####################