jfreechart 线图

package realtimeMonitor;

import java.awt.Color;
import java.awt.Font;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URISyntaxException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.time.Millisecond;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;

public class MemoryUsedLineServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public MemoryUsedLineServlet() {
		super();
	}

	public void service(HttpServletRequest request, HttpServletResponse response)   
	    throws ServletException, IOException {   
		try
		{
			//memoryUsedRate = RMIClient.getRMIInterface().getMemeryUsedRate("10.10.9.188");
			//System.out.print("memoryUsedRate"+memoryUsedRate);
			 getDynamicLine(request,"MemoryUsed",Integer.parseInt(ResolveJSONForShell.resolveJSONForMemoryUsed()),"MemoryUsed");
		}
		catch(Exception ex)
		{
			ex.printStackTrace();
		}
		
		
	}

	private static TimeSeries timeSeries;   
	public String getDynamicLine(HttpServletRequest request,String imageFileName,int warnValueStr,String timeSeriesName){

		JFreeChart chart = null;    
		if((null==(timeSeries))||("".equals(timeSeries))){
		    timeSeries = new TimeSeries("MemoryUsed",Millisecond.class); 
		    request.getSession().setAttribute(timeSeriesName, timeSeries);
		}
		timeSeries=(TimeSeries) request.getSession().getAttribute(timeSeriesName);
		timeSeries.addOrUpdate(new Millisecond(), warnValueStr); 
		chart=createChart("MemoryUsed","MemoryUsed","",timeSeries,request);
		FileOutputStream ous = null;
		String filePath="";//绝对路径
		String webPath="WarnImages/"+imageFileName+".png";//"+request.getSession().getId()+"
		try {
			filePath = Thread.currentThread().getContextClassLoader().getResource("").toURI().getPath();
			filePath =filePath.replace("WEB-INF/classes/", "");
			filePath += webPath;
		//	System.out.println(filePath);
		} catch (URISyntaxException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	try {
	        if (null != chart) {   
	        	ous = new FileOutputStream(filePath);
	            ChartUtilities.writeChartAsPNG(ous, chart, 400, 200);
	            //ous.flush();   
	        }  
	    } catch (IOException e) {
			e.printStackTrace();
		} // 生成图片
		finally {
			try {
				ous.close();// 最后关闭文件流
			} catch (IOException e) {
				e.printStackTrace();
			}
		} 
	
	return webPath;
	}

	public static  JFreeChart createChart(String chartContent,String title,String yaxisName,TimeSeries timeSeries,HttpServletRequest request){   
	    
	     TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(timeSeries);   
	     JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(title,"",yaxisName,timeseriescollection,true,true,false);   
	     
	     jfreechart.getTitle().setFont(new Font("宋体", Font.BOLD,12));
	     
	     XYPlot xyplot = jfreechart.getXYPlot();   
	     xyplot.setBackgroundPaint(Color.gray);
	     xyplot.getRenderer().setSeriesPaint(0,Color.CYAN);
	     jfreechart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));   
	    
	     NumberAxis  numberAxis=(NumberAxis) xyplot.getRangeAxis();
	     numberAxis.setLabelFont(new Font("宋体",Font.BOLD,12));
	
	     ValueAxis valueaxis = xyplot.getDomainAxis();   
	     valueaxis.setLabelFont(new Font("宋体",Font.BOLD,12));
	     valueaxis.setTickLabelFont(new Font("宋体",Font.BOLD,12));
	
	     valueaxis.setAutoRange(true);   
	
	     valueaxis.setFixedAutoRange(30000D);   
	
	     valueaxis = xyplot.getRangeAxis();   
	     //valueaxis.setRange(0.0D,200D);   
	     
	     return jfreechart;   
	 }   

	private int randomNum()   
	{      
	System.out.println("MemoryUsed:"+(Math.random()*20+80));         
	return (int)(Math.random()*20+80);   
	}   

}