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SSH框架通过JFreeChart实现柱状图和获取项目路径

获取项目路径：String url= ServletActionContext.getRequest().getRealPath("/upload");

一.直接生成的图片输出到jsp页面

1.jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<base href="<%=basePath%>">
<title>Insert title here</title>
</head>
<body>
<img alt="统计图" src="<%=basePath%>/chart2.action">
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%  
String path = request.getContextPath();  
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  
%> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<base href="<%=basePath%>">
<title>Insert title here</title>
</head>
<body>
 <!--img src='D:	empchart.jpg' width="680" height="700" onload="alert('图片存在');"  onerror="alert('无此图片');"/-->
 <img alt="统计图" src="<%=basePath%>/chart2.action">   
</body>
</html>

2.action类

[java] view plain copy

print?

public String execute() throws Exception{
//添加数据
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(42000, "月份" , "1月");
dataset.addValue(40000 , "月份" , "2月");
dataset.addValue(34000 , "月份" , "3月");
dataset.addValue(18000 , "月份" , "4月");
dataset.addValue(26000 , "月份" , "5月");
dataset.addValue(42000 , "月份" , "6月");
dataset.addValue(40000 , "月份" , "7月");
dataset.addValue(34000 , "月份" , "8月");
dataset.addValue(18000 , "月份" , "9月");
dataset.addValue(26000 , "月份" , "10月");
dataset.addValue(45000 , "月份" , "11月");
dataset.addValue(38000 , "月份" , "12月");
//创建一个柱状图
JFreeChart chart = ChartFactory.createBarChart3D("年度人口统计图", "人口", "数量",dataset,PlotOrientation.VERTICAL, true, false, false);
chart.setTitle(new TextTitle("年度人口统计图", new Font("黑体", Font.ITALIC,22)));
LegendTitle legend = chart.getLegend(0);
legend.setItemFont(new Font("宋体", Font.BOLD, 14));
CategoryPlot plot = (CategoryPlot) chart.getPlot();
CategoryAxis categoryAxis = plot.getDomainAxis();
categoryAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));
categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
categoryAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 18));
NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();
numberAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));
HttpServletResponse response=ServletActionContext.getResponse();
response.setContentType("image/");
ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1, chart, 900, 600, null);
response.getOutputStream().close();
return null;
}

	public String execute() throws Exception{
	 //添加数据
			DefaultCategoryDataset dataset = new DefaultCategoryDataset();
			dataset.addValue(42000, "月份" , "1月");
			dataset.addValue(40000 , "月份" , "2月");
			dataset.addValue(34000 , "月份" , "3月");
			dataset.addValue(18000 , "月份" , "4月");
			dataset.addValue(26000 , "月份" , "5月");
			dataset.addValue(42000 , "月份" , "6月");
			dataset.addValue(40000 , "月份" , "7月");
			dataset.addValue(34000 , "月份" , "8月");
			dataset.addValue(18000 , "月份" , "9月");
			dataset.addValue(26000 , "月份" , "10月");
			dataset.addValue(45000 , "月份" , "11月");
			dataset.addValue(38000 , "月份" , "12月");
		//创建一个柱状图
		JFreeChart chart = ChartFactory.createBarChart3D("年度人口统计图", "人口", "数量",dataset,PlotOrientation.VERTICAL, true, false, false);
		chart.setTitle(new TextTitle("年度人口统计图", new Font("黑体", Font.ITALIC,22)));
		LegendTitle legend = chart.getLegend(0);
		legend.setItemFont(new Font("宋体", Font.BOLD, 14));
		CategoryPlot plot = (CategoryPlot) chart.getPlot();
		CategoryAxis categoryAxis = plot.getDomainAxis();
		categoryAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));
		categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
		categoryAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 18));
		NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();
		numberAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));

		HttpServletResponse response=ServletActionContext.getResponse();
		response.setContentType("image/");
		ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1, chart, 900, 600, null);
		response.getOutputStream().close();
		
		return null;
}
</pre>3.struts.xml配置<p></p>


[java] view plain copy print?
<action name="chart2" class="Char2tAction">  
<result name="success">/Chart.jsp</result>  
</action>  
      <action name="chart2" class="Char2tAction">
      <result name="success">/Chart.jsp</result>
      </action>


  

Tip:参考的别的文章包一定得继承两个类，或者修改源码，实践正确配置如下：
       <!-- 柱状图 -->

	<package name="struts2" extends="struts-default,jfreechart-default">

		<action name="chart2" class="com.ssh.app.web.action.CreateChartBar">
		
                <result name="success">/tLiveStatistics.jsp</result>
		
                </action>

	</package> 

  

4.效果图








二.生成图片保存到本地：
1.生成图片


[java] view plain copy print?
    public void createChart() {  
        // TODO Auto-generated method stub        
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();   
        dataset.addValue(1001, "1", "A");     
        dataset.addValue(800, "2", "A");          
        dataset.addValue(150, "3", "A");      
        dataset.addValue(150, "1", "B");  
        dataset.addValue(150, "2", "B");      
        dataset.addValue(250, "3", "B");      
        dataset.addValue(150, "1", "C");      
        dataset.addValue(33, "2", "C");   
        dataset.addValue(900, "3", "C");      
//      JFreeChart chart = ChartFactory.createBarChart3D(   
//                                          "", // 图表标题   
//                                          "", // 目录轴的显示标签   
//                                          "产量", // 数值轴的显示标签   
//                                          dataset, // 数据集   
//                                          PlotOrientation.VERTICAL , // 图表方向：垂直   
//                                          true, // 是否显示图例(对于简单的柱状图必须是false)   
//                                          false, // 是否生成工具   
//                                          false // 是否生成URL链接   
//                                  );   
        //JFreeChart chart = ChartFactory.createBarChart3D("","","产量",dataset,PlotOrientation.VERTICAL,true,false,false);  
        JFreeChart chart = ChartFactory.createBarChart3D("销量统计图", "种类", "产量", dataset, PlotOrientation.VERTICAL, true, false, false);  
                  
        //重新设置图标标题，改变字体   
        chart.setTitle(new TextTitle("销量统计图", new Font("黑体", Font.ITALIC , 22)));   
                //取得统计图标的第一个图例   
                LegendTitle legend = chart.getLegend(0);   
                //修改图例的字体   
                legend.setItemFont(new Font("宋体", Font.BOLD, 14));   
                //legend.setItemFont(new Font("宋体", Font.TRUETYPE_FONT, 14));   
                CategoryPlot plot = (CategoryPlot)chart.getPlot();   
                  
                chart.setBackgroundPaint(ChartColor.WHITE);   
  
                //设置柱状图到图片上端的距离  
                ValueAxis rangeAxis = plot.getRangeAxis();  
                rangeAxis.setUpperMargin(0.5);  
                  
                //取得横轴   
                CategoryAxis categoryAxis = plot.getDomainAxis();   
                //设置横轴显示标签的字体   
                categoryAxis.setLabelFont(new Font("宋体" , Font.BOLD , 22));   
                //分类标签以45度角倾斜   
//              categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);   
                categoryAxis.setTickLabelFont(new Font("宋体" , Font.BOLD , 18));   
                  
                //取得纵轴   
                NumberAxis numberAxis = (NumberAxis)plot.getRangeAxis();   
                //设置纵轴显示标签的字体   
                numberAxis.setLabelFont(new Font("宋体" , Font.BOLD , 22));   
  
                //在柱体的上面显示数据  
                BarRenderer custombarrenderer3d = new BarRenderer();  
                custombarrenderer3d.setBaseItemLabelPaint(Color.BLACK);//数据字体的颜色  
                custombarrenderer3d.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());  
                custombarrenderer3d.setBaseItemLabelsVisible(true);  
                plot.setRenderer(custombarrenderer3d);  
                //HttpServletRequest request = null;  
                //request.getSession().getServletContext().getRealPath("/");  
                //URL a = Thread.currentThread().getContextClassLoader().getResource("");  
                //URL a = Thread.currentThread().getContextClassLoader().getResource("");       
                //System.out.println(a);  
                FileOutputStream fos = null;    
                //String imagePath = "D:\chart.jpg";  
                String imagePath = "D:\temp\chart.jpg";  
                ChartRenderingInfo info = new ChartRenderingInfo();   
                try {  
                    fos = new FileOutputStream(imagePath);  
                    //将统计图标输出成JPG文件   
                    ChartUtilities.writeChartAsJPEG(   
                        fos, //输出到哪个输出流   
                        1, //JPEG图片的质量，0~1之间   
                        chart, //统计图标对象   
                        800, //宽   
                        600,//高  
                        info //ChartRenderingInfo 信息   
                    );  
                    fos.close();  
                } catch (FileNotFoundException e) {  
                    // TODO Auto-generated catch block  
                    e.printStackTrace();  
                } catch (IOException e) {  
                    // TODO Auto-generated catch block  
                      
                    e.printStackTrace();  
                }  
          
    }  
	public void createChart() {
		// TODO Auto-generated method stub		
		DefaultCategoryDataset dataset = new DefaultCategoryDataset(); 
		dataset.addValue(1001, "1", "A");	
		dataset.addValue(800, "2", "A");		
		dataset.addValue(150, "3", "A");	
		dataset.addValue(150, "1", "B");
		dataset.addValue(150, "2", "B");	
		dataset.addValue(250, "3", "B");	
		dataset.addValue(150, "1", "C");	
		dataset.addValue(33, "2", "C");	
		dataset.addValue(900, "3", "C");	
//		JFreeChart chart = ChartFactory.createBarChart3D( 
//											"", // 图表标题 
//											"", // 目录轴的显示标签 
//											"产量", // 数值轴的显示标签 
//											dataset, // 数据集 
//											PlotOrientation.VERTICAL , // 图表方向：垂直 
//											true, // 是否显示图例(对于简单的柱状图必须是false) 
//											false, // 是否生成工具 
//											false // 是否生成URL链接 
//									); 
		//JFreeChart chart = ChartFactory.createBarChart3D("","","产量",dataset,PlotOrientation.VERTICAL,true,false,false);
		JFreeChart chart = ChartFactory.createBarChart3D("销量统计图", "种类", "产量", dataset, PlotOrientation.VERTICAL, true, false, false);
	//重新设置图标标题，改变字体 
	chart.setTitle(new TextTitle("销量统计图", new Font("黑体", Font.ITALIC , 22))); 
			//取得统计图标的第一个图例 
			LegendTitle legend = chart.getLegend(0); 
			//修改图例的字体 
	        legend.setItemFont(new Font("宋体", Font.BOLD, 14)); 
			//legend.setItemFont(new Font("宋体", Font.TRUETYPE_FONT, 14)); 
			CategoryPlot plot = (CategoryPlot)chart.getPlot(); 
			
			chart.setBackgroundPaint(ChartColor.WHITE); 

			//设置柱状图到图片上端的距离
			ValueAxis rangeAxis = plot.getRangeAxis();
			rangeAxis.setUpperMargin(0.5);
			
			//取得横轴 
			CategoryAxis categoryAxis = plot.getDomainAxis(); 
			//设置横轴显示标签的字体 
			categoryAxis.setLabelFont(new Font("宋体" , Font.BOLD , 22)); 
			//分类标签以45度角倾斜 

//				categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);

categoryAxis.setTickLabelFont(new Font("宋体" , Font.BOLD , 18));
			//取得纵轴 
			NumberAxis numberAxis = (NumberAxis)plot.getRangeAxis(); 
			//设置纵轴显示标签的字体 
			numberAxis.setLabelFont(new Font("宋体" , Font.BOLD , 22)); 

			//在柱体的上面显示数据
			BarRenderer custombarrenderer3d = new BarRenderer();
			custombarrenderer3d.setBaseItemLabelPaint(Color.BLACK);//数据字体的颜色
			custombarrenderer3d.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
			custombarrenderer3d.setBaseItemLabelsVisible(true);
			plot.setRenderer(custombarrenderer3d);
            //HttpServletRequest request = null;
			//request.getSession().getServletContext().getRealPath("/");
			//URL a = Thread.currentThread().getContextClassLoader().getResource("");
            //URL a = Thread.currentThread().getContextClassLoader().getResource("");     
            //System.out.println(a);
			FileOutputStream fos = null;  
			//String imagePath = "D:\chart.jpg";
			String imagePath = "D:\temp\chart.jpg";
			ChartRenderingInfo info = new ChartRenderingInfo(); 
			try {
				fos = new FileOutputStream(imagePath);
				//将统计图标输出成JPG文件 
				ChartUtilities.writeChartAsJPEG( 
					fos, //输出到哪个输出流 
					1, //JPEG图片的质量，0~1之间 
					chart, //统计图标对象 
					800, //宽 
					600,//高
					info //ChartRenderingInfo 信息 
				);
				fos.close();
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				
				e.printStackTrace();
			}
	
}</pre><br>

2.显示到jsp：      



[java] view plain copy print?
try{  
      
    String impath = "D:\temp\chart.jpg";//此处的图路径，是上面所示代码中生成柱状图的存储路径  
    File file = new File(impath);  
          
    InputStream inputStream = null;  
    if(file.exists()){  
        try {  
            inputStream = new FileInputStream(file);  
                      
        } catch (FileNotFoundException e) {  
                  
        }  
    }  
  
    int i = inputStream.available();   
         byte data[] = new byte[i];  
         inputStream.read(data);  
              
         HttpServletResponse response = ServletActionContext.getResponse();  
         ServletOutputStream out = response.getOutputStream();  
              
         response.setContentType("image/jpeg");  
              
         out.write(data);   
         out.flush();        
         out.close();   
              
}catch(IOException e){  
         e.printStackTrace();   
}  
		try{
		String impath = "D:\temp\chart.jpg";//此处的图路径，是上面所示代码中生成柱状图的存储路径
		File file = new File(impath);
			
		InputStream inputStream = null;
		if(file.exists()){
			try {
				inputStream = new FileInputStream(file);
						
			} catch (FileNotFoundException e) {
					
			}
		}

		int i = inputStream.available(); 
	         byte data[] = new byte[i];
	         inputStream.read(data);
	            
	         HttpServletResponse response = ServletActionContext.getResponse();
	         ServletOutputStream out = response.getOutputStream();
	            
	         response.setContentType("image/jpeg");
	            
	         out.write(data); 
	         out.flush();      
	         out.close(); 
	            
	}catch(IOException e){
	         e.printStackTrace(); 
	}</pre><br>

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原文地址：https://www.cnblogs.com/jpfss/p/7404946.html