function.java

Java+Eclipse+Mysql的局域网聊天程序源代码

import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.JFrame;
import java.awt.image.*;
import java.awt.*;
import javax.swing.ImageIcon;

class Function
{
	public static String getTimeTag()
	{
		long time=System.currentTimeMillis();
		String temp=String.valueOf(time);
		String substring=temp.substring(temp.length()-5, temp.length());
		return substring;
	}
	public static int getTime()
	{
		long time=System.currentTimeMillis();
		String temp=String.valueOf(time);
		String substring=temp.substring(temp.length()-5, temp.length());
		return Integer.parseInt(substring);
	}
	public static void  setCenter(JFrame f){   
        Dimension   scrsize   =   Toolkit.getDefaultToolkit().getScreenSize(); 
        f.setLocation(scrsize.width/2-f.getWidth()/2,   
                                    scrsize.height/2-f.getHeight()/2);   
	}
	public static ImageIcon GetPixels(ImageIcon imgicon,int w,int h)   
    {   
		Image img=imgicon.getImage();
        int[]pixels=new int[w*h];   //定义一数组，用来存储图片的象素   
        int gray;   
        PixelGrabber pg=new PixelGrabber(img,0,0,w,h,pixels,0,w);   
        try   
        {   
            pg.grabPixels();   //读取像素值   
        }   
        catch(InterruptedException   e)   
        {   
            System.err.println("图片灰度处理异常");   
        }   
          
        for(int   j=0;j<h;j++)   //扫描列   
        {   
            for(int   i=0;i<w;i++)   //扫描行   
            {   
                //由红，绿，蓝值得到灰度值   
                gray=(int)(((pixels[w*j+i]>>16)&0xff)*0.8);   
                gray+=(int)(((pixels[w*j+i]>>8)&0xff)*0.1);   
                gray+=(int)(((pixels[w*j+i])&0xff)*0.1);   
                pixels[w*j+i]=(255<<24)|(gray<<16)|(gray<<8)|gray;       
            }   
        }
        return new ImageIcon(Toolkit.getDefaultToolkit().createImage(new MemoryImageSource(w,h,pixels,0,w)));   //由像素值产生图像   
    }
	public static ImageIcon getImageIcon(Object object,String path)
	{
		try
		{
			return new ImageIcon(object.getClass().getResource(path));
		}
		catch(Exception e)
		{
			System.out.println("---------------读取用户头像时出错--------------");
			e.printStackTrace();
			return null;
		}
	}
}