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本文主要記錄下學習如何運用JRboin畫圖的一些測試代碼。
本次測試畫圖用到的測試資料demo_flow.rrd檔案,是來自之前寫的[url=http://sjsky.iteye.com/admin/blogs/811393]SNMP系列之(一)JRobin Core學習[/url]中的方法生成的,可供大家參考。JRboin的畫圖主要從下面兩方面:
[list]
[*][color=blue]直接定義RrdGraphDef對象畫圖[/color]
[*][color=blue]根據定義好的模闆XML檔案生成圖檔[/color][/list]
先看下兩中方法生成的圖檔效果圖:
[img]http://dl.iteye.com/upload/attachment/351073/dfeadeaa-1b79-38f5-a78b-ca867e38de45.png[/img]
[img]http://dl.iteye.com/upload/attachment/351075/14d7e2f5-92a0-3a88-8469-b996a04532ab.png[/img]
下面是我學習時生成圖檔的測試代碼以及定義的模闆檔案:
package com.snmp.jrobin;
import java.awt.Color;
import java.awt.Font;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import org.jrobin.core.Util;
import org.jrobin.graph.RrdGraph;
import org.jrobin.graph.RrdGraphDef;
import org.jrobin.graph.RrdGraphDefTemplate;
import org.xml.sax.InputSource;
/**
* @author Michael
*
*/
public class TestGraphCommon {
/**
* @param args
*/
public static void main(String[] args) {
String rootPath = "d:/test/jrobin/";
String imgFileName = "demo_graph_rrd.png";
TestGraphCommon test = new TestGraphCommon();
// 測試直接定義畫圖模闆生成圖檔
test.graphByGraphDef(rootPath, imgFileName);
String tempName = "graph-def-template.xml";
// 測試根據定義的XML模闆檔案生成圖檔
test.graphByTemplate(rootPath, tempName);
}
/**
* 直接定義畫圖模闆生成圖檔
* @param rootPath
* @param imgFileName
*/
private void graphByGraphDef(String rootPath, String imgFileName) {
try {
System.out.println("[rrd graph by RrdGraphDef start...]");
// 2010-10-01:1285862400L 2010-11-01:1288540800L
long startTime = Util.getTimestamp(2010, 10 - 1, 1);
long endTime = Util.getTimestamp(2010, 10 - 1, 31);
RrdGraphDef rgdef = new RrdGraphDef();
// If the filename is set to '-' the image will be created only in
// memory (no file will be created).
// rgdef.setFilename("-");
rgdef.setFilename(rootPath + imgFileName);
// "PNG", "GIF" or "JPG"
rgdef.setImageFormat("PNG");
// rgdef.setTimeSpan(startTime, endTime);
rgdef.setStartTime(startTime);
rgdef.setEndTime(endTime);
rgdef.setAntiAliasing(false);
rgdef.setSmallFont(new Font("Monospaced", Font.PLAIN, 11));
rgdef.setLargeFont(new Font("SansSerif", Font.BOLD, 14));
rgdef.setTitle("JRobin graph by RrdGraphDef demo");
// default 400
rgdef.setWidth(500);
// default 100
rgdef.setHeight(200);
// 一般不需要設定這個參數
// rgdef.setStep(86400);
rgdef.setVerticalLabel("transfer speed [bits/sec]");
rgdef.datasource("in", rootPath + "demo_flow.rrd", "input",
"AVERAGE");
rgdef.datasource("out", rootPath + "demo_flow.rrd", "output",
"AVERAGE");
rgdef.datasource("in8", "in,8,*");
rgdef.datasource("out8", "out,8,*");
// PS:先畫域的再畫線的,否則線會被域遮蓋
rgdef.area("out8", new Color(0, 206, 0), "output traffic");
rgdef.line("in8", Color.BLUE, "input traffic\\l");
// \\l->左對齊 \\c->中間對齊 \\r->右對齊 \\j->自适應
// \\s-> \\g->glue \\J->
rgdef.gprint("in8", "MAX", "maxIn=%.2f %sbits/sec");
rgdef.gprint("out8", "MAX", "maxOut=%.2f %sbits/sec\\l");
rgdef.gprint("in8", "AVERAGE", "avgIn=%.2f %sbits/sec");
rgdef.gprint("out8", "AVERAGE", "avgOut=%.2f %sbits/sec\\l");
rgdef.gprint("in8", "TOTAL", "totalIn=%.2f %sbits/sec");
rgdef.gprint("out8", "TOTAL", "totalOut=%.2f %sbits/sec\\s");
rgdef.comment("畫圖測試");
RrdGraph graph = new RrdGraph(rgdef);
System.out.println("[rrd graph info:]"
+ graph.getRrdGraphInfo().dump());
// 如果filename沒有設定,隻是在記憶體中,可以調用下面的方法再次生成圖檔檔案
if ("-".equals(graph.getRrdGraphInfo().getFilename())) {
createImgFile(graph, rootPath + imgFileName);
}
System.out.println("[rrd graph by RrdGraphDef success.]");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* ImageIO 生成圖檔檔案
*/
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();
}
}
/**
* 根據定義的XML模闆生成圖檔
* @param rootPath
* @param imgFileName
*/
private void graphByTemplate(String rootPath, String tempName) {
try {
System.out.println("[rrd graph by xml template start...]");
RrdGraphDefTemplate defTemplate = new RrdGraphDefTemplate(
new InputSource(rootPath + tempName));
// setVariable 設定XML template的變量
defTemplate.setVariable("startTime", "20101001 00:00");
defTemplate.setVariable("endTime", "20101031 23:59");
defTemplate.setVariable("in_rrd_file", rootPath + "demo_flow.rrd");
defTemplate.setVariable("out_rrd_file", rootPath + "demo_flow.rrd");
RrdGraph graph = new RrdGraph(defTemplate.getRrdGraphDef());
BufferedImage image = new BufferedImage(graph.getRrdGraphInfo()
.getWidth(), graph.getRrdGraphInfo().getHeight(),
BufferedImage.TYPE_INT_RGB);
graph.render(image.getGraphics());
File imgFile = new File(rootPath + "demo_graph_tmp.PNG");
ImageIO.write(image, "PNG", imgFile);//
System.out.println("[rrd graph by xml template success.]");
} catch (Exception e) {
e.printStackTrace();
}
}
}