JRobin例子

以下是根据一些代码修改学习，得到的模拟监控硬盘利用率的例子。图一和图二分别为每半小时的平均值和每一小时的平均值。
import org.jrobin.core.*;
import java.io.*;
import java.util.Date;
import org.jrobin.graph.*;
import java.awt.Color;
import java.awt.Font;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;


public class testDisk {
  public static void main(String[] args) {
 testDisk test = new testDisk();
 String rootPath = "d:/";
      String imgFileName = "testDisk.png";
     try {
       RrdDef rrdDef = new RrdDef("d:\\testDisk.rrd");
     //获得2012年9月24日的时间戳
       Long startTime = Util.getTimestamp(2012, 9 - 1, 24);
       System.out.println("startTime:"+startTime);
       rrdDef.setStartTime(startTime);
       //数据源：speed  数据源类型：counter 如果超过600s没有数据，显示UNKNOW 最小值Double.NaN,最大值。。
       rrdDef.addDatasource("disk", "GAUGE", 600, Double.NaN, Double.NaN);
       //RRA:AVERAGE:0.5:12:24 (1天) 
       //rrdDef.addArchive("AVERAGE", 0.5, 12, 24);
       rrdDef.addArchive("AVERAGE", 0.5, 6, 48);
       RrdDb rrdDb = new RrdDb(rrdDef);
       Sample sample = rrdDb.createSample();
       sample.setAndUpdate("1348416300:12.3");
       sample.setAndUpdate("1348416600:14.56");
       sample.setAndUpdate("1348416900:14.67");
       sample.setAndUpdate("1348417200:12.21");
       sample.setAndUpdate("1348417500:37.6");
       sample.setAndUpdate("1348417800:43.22");
       sample.setAndUpdate("1348418100:17.12");
       sample.setAndUpdate("1348418400:16.54");
       sample.setAndUpdate("1348418700:42.33");
       sample.setAndUpdate("1348419000:12.21");
       sample.setAndUpdate("1348419300:12.43");
       sample.setAndUpdate("1348419600:14.43");
       rrdDb.close();
       RrdGraphDef graphDef = new RrdGraphDef();
       graphDef.datasource("diskUsage", "d:\\testDisk.rrd", "disk", "AVERAGE");
       graphDef.line("diskUsage", new Color(0xFF, 0, 0), null, 2);
       graphDef.setImageFormat("png");
       RrdGraph graph = new RrdGraph(graphDef);
       System.out.println("[rrd graph info:]"
               + graph.getRrdGraphInfo().dump());     
      test.createImgFile(graph,"d:\\disk.png");
     }
     catch (Exception ex) {
       ex.printStackTrace();
     }
  }
  /**
   * 生成图片文件
   */
 private void createImgFile(RrdGraph graph, String imgFileFullName) {


      try {
          BufferedImage image = new BufferedImage(graph.getRrdGraphInfo()
                  .getWidth(), graph.getRrdGraphInfo().getHeight(),
                  BufferedImage.TYPE_INT_RGB);
          graph.render(image.getGraphics());
          File imgFile = new File(imgFileFullName);
          ImageIO.write(image, "png", imgFile);
      } catch (Exception e) {
          e.printStackTrace();
      }
 }
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