import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.faces.event.ActionEvent;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.StandardEntityCollection;

public class JFreeChartBean {

	private JFreeChart chart;
	
	private String mapCode;
	
	private ByteArrayOutputStream outputStream;

	public JFreeChartBean() {
		
	}

	public void selectBarChart(ActionEvent e) {
		chart = BarChart.initBarChart();
	}

	public void selectLineChart(ActionEvent e) {
		chart = LineChart.initLineChart();
	}
         //a4j:mediaOutput組件創建圖片的方法
	public void paint(OutputStream out, Object object) throws IOException {
		try {
			byte[] b = outputStream.toByteArray();
			out.write(b);
			out.flush();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public JFreeChart getChart() {
		if (chart == null) {
			chart = BarChart.initBarChart();
		}
		return chart;
	}

	public void setChart(JFreeChart chart) {
		this.chart = chart;
	}
	//獲取到與生成的圖片對應的map
	public String getMapCode() {
		PrintWriter pw = null;
		try {
			ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
			outputStream = new ByteArrayOutputStream();
			ChartUtilities.writeChartAsPNG(outputStream,getChart(),500,300, info);
			pw = new PrintWriter(outputStream);
			ChartUtilities.writeImageMap(pw, "imgMap", info, false);
			mapCode = ChartUtilities.getImageMap("imgMap", info);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return mapCode;
	}

	
	public void setMapCode(String mapCode) {
		this.mapCode = mapCode;
	}
    

    
<h:form id="jFreeChartForm">
		<t:panelGrid columns="2">
		<a4j:commandButton value="BarChart" immediate="true" actionListener="#{jFreeChartBean.selectBarChart}" reRender="outMap,chart,jFreeChartForm"/>
		<a4j:commandButton value="LineChart" immediate="true" actionListener="#{jFreeChartBean.selectLineChart}" reRender="outMap,chart,jFreeChartForm"/>
		</t:panelGrid>
		<a4j:mediaOutput id="chart"  element="img"  cacheable="false"  session="false" ismap="true" usemap="#imgMap"
			createContent="#{jFreeChartBean.paint}" mimeType="image/jpeg"/>
		<t:outputText id="outMap" escape="false" value="#{jFreeChartBean2.mapCode}"></t:outputText> 
	</h:form>

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	loadTreeMenu:function() {
		var treeMenuLoader = this;
		var menu = 'me';
		var par = window.location.search;
		if (par.length != 0)
			menu = par.substring(7, (par.length - 1));
		var url = "tree.xml";
		var bindArgs = {
			url: url,
			mimetype: "text/xml",
			method: "post",
			content: {'menu': menu},
			load: function(type, data, evt){
				treeMenuLoader.treeMenuData = data.selectSingleNode('/MenuConfig/Menu[@id="' + menu + '"]');
				treeMenuLoader.rendTree.call(treeMenuLoader);
} 
		};
		dojo.io.bind(bindArgs);
	},

rendTree: function() {
		var treeMenuLoader = this;
		var treeMenuData = treeMenuLoader.treeMenuData;
		var webFXTreeConfig = {
			usePersistence:true
		};
		var tree = new WebFXTree('root', treeMenuData.getAttribute("title"), '', '', treeMenuData.getAttribute("image"), treeMenuData.getAttribute("image"));
		var childNodesData = treeMenuData.selectNodes('Item');
		dojo.lang.forEach(childNodesData, function(childNodeData) {
			treeMenuLoader.addItem(tree, childNodeData);
		});
		dojo.byId('menuTree').innerHTML = tree;
	},
	addItem:function(tree, node) {
		var treeMenuLoader = this;
		var sText = node.getAttribute('title');
		var id = node.getAttribute('id');
		var sAction = node.getAttribute('page');
		var sTarget = node.getAttribute('target');
		if(sTarget == null)
			sTarget = 'mainFrame';
		var sTip = node.getAttribute('toolTip');
		var sIcon = node.getAttribute('image');
		var item = new WebFXTreeItem(id, sText, sAction, sTarget, sTip, null, sIcon, sIcon);
		var nodes = node.selectNodes('Item');
		dojo.lang.forEach(nodes, function(node) {
			treeMenuLoader.addItem(item, node);
		});
		tree.add(item);
	}

• 北京: 千橡集团暨校内网诚聘软件研发工程师
• 搜狐网站诚聘Java、PHP和C++工程师