本文主要记录下学习如何运用JRboin画图的一些测试代码。
本次测试画图用到的测试数据demo_flow.rrd文件，是来自之前写的SNMP系列之(一)JRobin Core学习中的方法生成的，可供大家参考。
JRboin的画图主要从下面两方面：
- 直接定义RrdGraphDef对象画图
- 根据定义好的模板XML文件生成图片
先看下两中方法生成的图片效果图：
下面是我写demo时生成图片的测试代码以及定义的模板XML文件：
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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(); // 测试直接定义画图模板生成图片 test.graphByGraphDef(rootPath, imgFileName); String tempName = "graph-def-template.xml"; // 测试根据定义的XML模板文件生成图片 test.graphByTemplate(rootPath, tempName); } /** * 直接定义画图模板生成图片 * @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); // 一般不需要设置这个参数 // 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：先画域的再画线的，否则线会被域遮盖 rgdef.area("out8", new Color(0, 206, 0), "output traffic"); rgdef.line("in8", Color.BLUE, "input traffic\\l"); // \\l->左对齐 \\c->中间对齐 \\r->右对齐 \\j->自适应 // \\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("画图测试"); RrdGraph graph = new RrdGraph(rgdef); System.out.println("[rrd graph info:]" + graph.getRrdGraphInfo().dump()); // 如果filename没有设置，只是在内存中，可以调用下面的方法再次生成图片文件 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(); } } /** * 根据定义的XML模板生成图片 * @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 设置XML template的变量 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(); } } } |
模板XML文件：
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<?xml version="1.0" encoding="GB2312"?> <rrd_graph_def> <span> <start>${startTime}</start> <end>${endTime}</end> </span> <filename>-</filename> <options> <anti_aliasing>off</anti_aliasing> <fonts> <small_font> <name>Monospaced</name> <style>PLAIN</style> <size>11</size> </small_font> <large_font> <name>SansSerif</name> <style>BOLD</style> <size>14</size> </large_font> </fonts> <title>JRobin graph by xml template demo</title> <vertical_label>transfer speed [bits/sec]</vertical_label> <width>500</width> <height>200</height> <base>1024</base> </options> <datasources> <def> <name>in</name> <rrd>${in_rrd_file}</rrd> <source>input</source> <cf>AVERAGE</cf> </def> <def> <name>out</name> <rrd>${out_rrd_file}</rrd> <source>output</source> <cf>AVERAGE</cf> </def> </datasources> <graph> <area> <datasource>in</datasource> <color>#00ce00</color> <legend>入速率</legend> </area> <line> <datasource>out</datasource> <color>#0000FF</color> <legend>出速率\l</legend> </line> <gprint> <datasource>in</datasource> <cf>MAX</cf> <format>入速率最大值:%7.2f %sbits/sec</format> </gprint> <gprint> <datasource>out</datasource> <cf>MAX</cf> <format>出速率最大值:%7.2f %sbits/sec\l</format> </gprint> <gprint> <datasource>in</datasource> <cf>AVERAGE</cf> <format>入速率平均值:%7.2f %sbits/sec</format> </gprint> <gprint> <datasource>out</datasource> <cf>AVERAGE</cf> <format>出速率平均值:%7.2f %sbits/sec\l</format> </gprint> <gprint> <datasource>in</datasource> <cf>TOTAL</cf> <format>总入流量:%7.2f %sbits</format> </gprint> <gprint> <datasource>out</datasource> <cf>TOTAL</cf> <format>总出流量:%7.2f %sbits\l</format> </gprint> <comment>测试画图\l</comment> </graph> </rrd_graph_def> |
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