poptoolkit.java

该系统是一个基于p2p的即时聊天系统

/*
 * @(#) PopToolkit.java
 * Copyright 2004 HWStudio. All rights reserved.
 */
package hws.item.smart.misc;
//导入核心Java类库
import java.io.File;
import java.io.Writer;
import java.io.FileWriter;
import java.io.IOException;
import java.awt.Window;
import java.awt.Toolkit;
import java.awt.Dimension;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Calendar;
//导入第三方Java类库
import org.apache.commons.codec.binary.Base64;
/**
 * 常用工具箱
 *
 * @version 0.1 2005-08-29
 * @author Hwerz
 */
public class PopToolkit extends Object {
    /*------------------------------------------------------------------------*
     *                                属性定义                                *
     *------------------------------------------------------------------------*/
    /**
     * 静态常量
     */
    private static final String ZERO = "0";
    /**
     * Base64工具类
     */
    private static final Base64 BASE64 = new Base64();
    /*------------------------------------------------------------------------*
     *                                构造函数                                *
     *------------------------------------------------------------------------*/
    /**
     * 构造函数为私有，这样在整个运行过程中该类就只能有一个实例
     */
    private PopToolkit() {
        super();
    }
    /*------------------------------------------------------------------------*
     *                                公共方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 返回当天的日期
     *
     * @return 当天的日期
     */
    public static String getCurrentDate() {
        StringBuffer buffer = new StringBuffer();
        Calendar calendar = Calendar.getInstance();
        buffer.append(calendar.get(Calendar.YEAR));
        buffer.append("-");
        //注意：月份从０算起
        int month = calendar.get(Calendar.MONTH) + 1;
        if (month < 10) {
            buffer.append(ZERO);
        }
        buffer.append(month);
        buffer.append("-");
        if (calendar.get(Calendar.DAY_OF_MONTH) < 10) {
            buffer.append(ZERO);
        }
        buffer.append(calendar.get(Calendar.DAY_OF_MONTH));
        return buffer.toString();
    }
    /**
     * 返回当时的时间
     *
     * @return 当时的时间
     */
    public static String getCurrentTime() {
        StringBuffer buffer = new StringBuffer();
        Calendar calendar = Calendar.getInstance();
        buffer.append(calendar.get(Calendar.HOUR_OF_DAY));
        buffer.append(":");
        int minute = calendar.get(Calendar.MINUTE);
        if (minute < 10) {
            buffer.append(ZERO);
        }
        buffer.append(minute);
        buffer.append(":");
        int second = calendar.get(Calendar.SECOND);
        if (second < 10) {
            buffer.append(ZERO);
        }
        buffer.append(second);
        return buffer.toString();
    }
    /**
     * 返回当时时间的长格式形式
     *
     * @return 当时时间的长格式形式
     */
    public static String getLongTime() {
        StringBuffer time = new StringBuffer();
        time.append(getCurrentDate());
        time.append(" ");
        time.append(getCurrentTime());
        return time.toString();
    }
    /**
     * 将指定的字符串保存到指定的文件中
     *
     * @param string 指定的字符串
     * @param file 指定的文件
     */
    public static void saveString2File(String string, File file) {
        try {
            Writer writer = new FileWriter(file);
            writer.write(string);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    /**
     * 判断指定的年份是否是闰年
     *
     * @param year 指定的年份
     * @return 如果指定的年份是闰年则返回true，否则返回false
     */
    public static boolean isLeapYear(int year) {
        boolean leap = false;
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            leap = true;
        }
        return leap;
    }
    /**
     * 返回本地IP地址
     *
     * @return 本地IP地址
     */
    public static String getLocalIP() {
        String ip = "UnknownHost";
        try {
            ip = InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        return ip;
    }
    /**
     * 检查指定的文件名是否合法
     *
     * @param name 指定的文件名
     * @return 如果指定的文件名合法则返回true，否则返回false
     */
    public static boolean checkFileName(String name) {
        boolean valid = true;
        if (name == null) {
            valid = false;
        } else if (name.length() == 0) {
            valid = false;
        } else if (name.length() == 1 && name.equals(".")) {
            valid = false;
        } else {
            char[] chars = {'\\', '/', ':', '*', '?', '<', '>', '|', '\"'};
            for (int i = 0; i < name.length(); i++) {
                char c = name.charAt(i);
                for (int j = 0; j < chars.length; j++) {
                    if (c == chars[j]) {
                        valid = false;
                        break;
                    }
                }
                if (valid == false) {
                    break;
                }
            }
        }
        return valid;
    }
    /**
     * 检查指定的字符串是否可以转化为合法的整数
     *
     * @param value 指定的字符串
     * @return 如果指定的字符串可以转化为合法的整数则返回true，否则返回false
     */
    public static boolean checkNumber(String value) {
        boolean valid = true;
        if (value == null) {
            valid = false;
        } else if (value.length() == 0) {
            valid = false;
        } else {
            char[] chars = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
            for (int i = 0; i < value.length(); i++) {
                char c = value.charAt(i);
                for (int j = 0; j < chars.length; j++) {
                    valid = false;
                    if (c == chars[j]) {
                        valid = true;
                        break;
                    }
                }
                if (valid == false) {
                    break;
                }
            }
        }
        return valid;
    }
    /**
     * 将指定的窗体对象置于屏幕中间
     *
     * @param window 待置于屏幕中间的窗体对象
     */
    public static void makeWindowCenter(Window window) {
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension windowSize = window.getSize();
        if (windowSize.height > screenSize.height) {
            windowSize.height = screenSize.height;
        }
        if (windowSize.width > screenSize.width) {
            windowSize.width = screenSize.width;
        }
        window.setLocation((screenSize.width - windowSize.width) / 2,
            (screenSize.height - windowSize.height) / 2);
        window.setVisible(true);
    }
    /**
     * 采用Base64算法编码
     *
     * @param data 待编码的数据
     * @return 编码后的数据
     */
    public static String encode(byte[] data) {
        return new String(BASE64.encode(data));
    }
    /**
     * 采用Base64算法解码
     *
     * @param data 待解码的数据
     * @return 解码后的数据
     */
    public static byte[] decode(String data) {
        return BASE64.decode(data.getBytes());
    }
}