www.pudn.com > JSP调用Java Bean在网页上动态生成柱状图.zip > ChartGraphics.java

//生成图片的 Java Bean 
//作者:崔冠宇 
//日期:2001-08-24 
import java.io.*; 
import java.util.*; 
import com.sun.image.codec.jpeg.*; 
import java.awt.image.*; 
import java.awt.*; 
 
public class ChartGraphics { 
  BufferedImage image; 
  public void createImage(String fileLocation) { 
    try { 
      FileOutputStream fos = new FileOutputStream(fileLocation); 
      BufferedOutputStream bos = new BufferedOutputStream(fos); 
      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos); 
      encoder.encode(image); 
      bos.close();  
    } catch(Exception e) { 
      System.out.println(e); 
    } 
  }   
   
  public void graphicsGeneration(int h1,int h2,int h3,int h4,int h5) { 
  	 
    final int X=10; 
    int imageWidth = 300;//图片的宽度 
    int imageHeight = 300;//图片的高度    
    int columnWidth=30;//柱的宽度 
    int columnHeight=200;//柱的最大高度 
     
    ChartGraphics chartGraphics = new ChartGraphics();	 
    chartGraphics.image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);  
    Graphics graphics = chartGraphics.image.getGraphics(); 
    graphics.setColor(Color.white); 
    graphics.fillRect(0,0,imageWidth,imageHeight);     
    graphics.setColor(Color.red); 
    graphics.drawRect(X+1*columnWidth, columnHeight-h1, columnWidth, h1); 
    graphics.drawRect(X+2*columnWidth, columnHeight-h2, columnWidth, h2); 
    graphics.drawRect(X+3*columnWidth, columnHeight-h3, columnWidth, h3);     
    graphics.drawRect(X+4*columnWidth, columnHeight-h4, columnWidth, h4); 
    graphics.drawRect(X+5*columnWidth, columnHeight-h5, columnWidth, h5);    	 
    chartGraphics.createImage("F:\\Program Files\\Allaire\\JRun\\servers\\default\\demo-app\\jsp\\chart.jpg"); 
  }  
}