抽奖

1、模型：

package com.huawei.model;
/**
 * 模型
 * @author wym
 *
 */
public class Person {

    private String memberNum;
    private String name;
    public Person() {
        super();
    }

    public Person(String memberNum, String name) {
        super();
        this.memberNum = memberNum;
        this.name = name;
    }

    public String getMemberNum() {
        return memberNum;
    }
    public void setMemberNum(String memberNum) {
        this.memberNum = memberNum;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

2、工具类：
（1）：PropertiesUtil类：

package com.huawei.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;

public class PropertiesUtil {

    static Properties properties = new Properties();

    private String memberNum;
    private String name;

    public String getMemberNum() {
        return memberNum;
    }
    public void setMemberNum(String memberNum) {
        this.memberNum = memberNum;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 加载配置文件信息
     */
    public static HashMap<String,String> readProperties(){
        Properties properties = new Properties();
        InputStream in;
        try {
            in = new FileInputStream("member.properties");
            try {
                properties.load(in);
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }   

        HashMap<String,String> members = new HashMap<String,String>();
        Set<Entry<Object, Object>> set = properties.entrySet();  
        Iterator<Map.Entry<Object, Object>> it = set.iterator();  
        String key = null, value = null;   
        while (it.hasNext()) {  

            Entry<Object, Object> entry = it.next();  
            key = String.valueOf(entry.getKey());  
            value = String.valueOf(entry.getValue());  

            key = key == null ? key : key.trim().toUpperCase();  
            value = value == null ? value : value.trim().toUpperCase();  
            members.put(key, value);  
        }  
        return members;
    }

    /**
     * 获取配置文件中某个属性对应的成员名
     * @param n 成员编号
     * @return 成员名
     */
    public static String getProperty(int n){
        Properties properties = new Properties();
        InputStream in;
        try {
            in = new FileInputStream("member.properties");
            try {
                properties.load(in);
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }   

        String number = "member"+n;
        String name = properties.getProperty(number);
        return name;
    }

    /**
     * 获取某个成员的编号
     */
    public static int getMembersNum(){
        Properties properties = new Properties();
        InputStream in;
        try {
            in = new FileInputStream("member.properties");
            try {
                properties.load(in);
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }   
        Set<Entry<Object, Object>> set = properties.entrySet();  

        return set.size();
    }
}

（2）RandomNum类：

package com.huawei.util;

public class RandomNum {

    /**
     * 生成随机数
     * @param n 随机数的最大值
     * @return 随机数
     */
    public static int getRandomNum(int n){
        int number = (int)(Math.random()*n)+1;
        return number;
    }
}

3、界面：

package com.huawei.view;

import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JTextField;

import com.huawei.util.PropertiesUtil;
import com.huawei.util.RandomNum;

public class UserUI {

    // 创建窗体对象
    private static Frame f = new Frame("抽奖");
    private static final JTextField member = new JTextField(); 
    private static Button bu = new Button("开始抽奖");

    public static void main(String[] args) {

        f.setLayout(null) ;
        bu.setBounds(250,100,100,30);
        member.setBounds(250,150,100,30);
        member.setHorizontalAlignment(JTextField.CENTER); 

        f.add(bu);
        f.add(member);
        f.setBounds(0,0,600,400);
        f.setBackground(Color.WHITE);
        f.setLocation(0,0);
        f.setVisible(true);

        // 设置窗体可以关闭
        f.addWindowListener(new WindowAdapter() {
           @Override
           public void windowClosing(WindowEvent e) {
              System.exit(0);
           }
        });

        bu.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent e) {
                int membersNum = PropertiesUtil.getMembersNum();
                int n = RandomNum.getRandomNum(membersNum);
                String name = PropertiesUtil.getProperty(n);
                member.setText(name);
           }
        });
    }
}

4、配置文件：

member1=\u5F20\u4E09
member2=\u674E\u56DB
member3=\u738B\u4E94
member4=\u8D75\u516D

5、效果图：