SSH框架通过JFreeChart实现柱状图和获取项目路径

2022-11-20 21:14:23

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

  1. <%@ page language="java" contentType="text/html; charset=UTF-8"
  2. pageEncoding="UTF-8"%>
  3. <%@ taglib prefix="s" uri="/struts-tags" %>
  4. <%
  5. String path = request.getContextPath();
  6. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  7. %>
  8. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  9. <html>
  10. <head>
  11. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  12. <base href="<%=basePath%>">
  13. <title>Insert title here</title>
  14. </head>
  15. <body>
  16. <!--img src='D:\temp\chart.jpg' width="680" height="700" onload="alert('图片存在');"  onerror="alert('无此图片');"/-->
  17. <img alt="统计图" src="<%=basePath%>/chart2.action">
  18. </body>
  19. </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:\temp\chart.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

  1. public String execute() throws Exception{
  2. //添加数据
  3. DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  4. dataset.addValue(42000, "月份" , "1月");
  5. dataset.addValue(40000 , "月份" , "2月");
  6. dataset.addValue(34000 , "月份" , "3月");
  7. dataset.addValue(18000 , "月份" , "4月");
  8. dataset.addValue(26000 , "月份" , "5月");
  9. dataset.addValue(42000 , "月份" , "6月");
  10. dataset.addValue(40000 , "月份" , "7月");
  11. dataset.addValue(34000 , "月份" , "8月");
  12. dataset.addValue(18000 , "月份" , "9月");
  13. dataset.addValue(26000 , "月份" , "10月");
  14. dataset.addValue(45000 , "月份" , "11月");
  15. dataset.addValue(38000 , "月份" , "12月");
  16. //创建一个柱状图
  17. JFreeChart chart = ChartFactory.createBarChart3D("年度人口统计图", "人口", "数量",dataset,PlotOrientation.VERTICAL, true, false, false);
  18. chart.setTitle(new TextTitle("年度人口统计图", new Font("黑体", Font.ITALIC,22)));
  19. LegendTitle legend = chart.getLegend(0);
  20. legend.setItemFont(new Font("宋体", Font.BOLD, 14));
  21. CategoryPlot plot = (CategoryPlot) chart.getPlot();
  22. CategoryAxis categoryAxis = plot.getDomainAxis();
  23. categoryAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));
  24. categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
  25. categoryAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 18));
  26. NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();
  27. numberAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));
  28. HttpServletResponse response=ServletActionContext.getResponse();
  29. response.setContentType("image/");
  30. ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1, chart, 900, 600, null);
  31. response.getOutputStream().close();
  32. return null;
  33. }
	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>




    

  1. <action name="chart2" class="Char2tAction">
    2. 

  2. <result name="success">/Chart.jsp</result>
    3. 

  3. </action>
    4. 





      <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


SSH框架通过JFreeChart实现柱状图和获取项目路径


二.生成图片保存到本地：


1.生成图片




    

  1. public void createChart() {
    2. 

  2. // TODO Auto-generated method stub
    3. 

  3. DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    4. 

  4. dataset.addValue(1001, "1", "A");
    5. 

  5. dataset.addValue(800, "2", "A");
    6. 

  6. dataset.addValue(150, "3", "A");
    7. 

  7. dataset.addValue(150, "1", "B");
    8. 

  8. dataset.addValue(150, "2", "B");
    9. 

  9. dataset.addValue(250, "3", "B");
    10. 

  10. dataset.addValue(150, "1", "C");
    11. 

  11. dataset.addValue(33, "2", "C");
    12. 

  12. dataset.addValue(900, "3", "C");
    13. 

  13. //      JFreeChart chart = ChartFactory.createBarChart3D(
    14. 

  14. //                                          "", // 图表标题
    15. 

  15. //                                          "", // 目录轴的显示标签
    16. 

  16. //                                          "产量", // 数值轴的显示标签
    17. 

  17. //                                          dataset, // 数据集
    18. 

  18. //                                          PlotOrientation.VERTICAL , // 图表方向：垂直
    19. 

  19. //                                          true, // 是否显示图例(对于简单的柱状图必须是false)
    20. 

  20. //                                          false, // 是否生成工具
    21. 

  21. //                                          false // 是否生成URL链接
    22. 

  22. //                                  );
    23. 

  23. //JFreeChart chart = ChartFactory.createBarChart3D("","","产量",dataset,PlotOrientation.VERTICAL,true,false,false);
    24. 

  24. JFreeChart chart = ChartFactory.createBarChart3D("销量统计图", "种类", "产量", dataset, PlotOrientation.VERTICAL, true, false, false);
    25. 

  25. //重新设置图标标题，改变字体
    26. 

  26. chart.setTitle(new TextTitle("销量统计图", new Font("黑体", Font.ITALIC , 22)));
    27. 

  27. //取得统计图标的第一个图例
    28. 

  28. LegendTitle legend = chart.getLegend(0);
    29. 

  29. //修改图例的字体
    30. 

  30. legend.setItemFont(new Font("宋体", Font.BOLD, 14));
    31. 

  31. //legend.setItemFont(new Font("宋体", Font.TRUETYPE_FONT, 14));
    32. 

  32. CategoryPlot plot = (CategoryPlot)chart.getPlot();
    33. 

  33. chart.setBackgroundPaint(ChartColor.WHITE);
    34. 

  34. //设置柱状图到图片上端的距离
    35. 

  35. ValueAxis rangeAxis = plot.getRangeAxis();
    36. 

  36. rangeAxis.setUpperMargin(0.5);
    37. 

  37. //取得横轴
    38. 

  38. CategoryAxis categoryAxis = plot.getDomainAxis();
    39. 

  39. //设置横轴显示标签的字体
    40. 

  40. categoryAxis.setLabelFont(new Font("宋体" , Font.BOLD , 22));
    41. 

  41. //分类标签以45度角倾斜
    42. 

  42. //              categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
    43. 

  43. categoryAxis.setTickLabelFont(new Font("宋体" , Font.BOLD , 18));
    44. 

  44. //取得纵轴
    45. 

  45. NumberAxis numberAxis = (NumberAxis)plot.getRangeAxis();
    46. 

  46. //设置纵轴显示标签的字体
    47. 

  47. numberAxis.setLabelFont(new Font("宋体" , Font.BOLD , 22));
    48. 

  48. //在柱体的上面显示数据
    49. 

  49. BarRenderer custombarrenderer3d = new BarRenderer();
    50. 

  50. custombarrenderer3d.setBaseItemLabelPaint(Color.BLACK);//数据字体的颜色
    51. 

  51. custombarrenderer3d.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
    52. 

  52. custombarrenderer3d.setBaseItemLabelsVisible(true);
    53. 

  53. plot.setRenderer(custombarrenderer3d);
    54. 

  54. //HttpServletRequest request = null;
    55. 

  55. //request.getSession().getServletContext().getRealPath("/");
    56. 

  56. //URL a = Thread.currentThread().getContextClassLoader().getResource("");
    57. 

  57. //URL a = Thread.currentThread().getContextClassLoader().getResource("");
    58. 

  58. //System.out.println(a);
    59. 

  59. FileOutputStream fos = null;
    60. 

  60. //String imagePath = "D:\\chart.jpg";
    61. 

  61. String imagePath = "D:\\temp\\chart.jpg";
    62. 

  62. ChartRenderingInfo info = new ChartRenderingInfo();
    63. 

  63. try {
    64. 

  64. fos = new FileOutputStream(imagePath);
    65. 

  65. //将统计图标输出成JPG文件
    66. 

  66. ChartUtilities.writeChartAsJPEG(
    67. 

  67. fos, //输出到哪个输出流
    68. 

  68. 1, //JPEG图片的质量，0~1之间
    69. 

  69. chart, //统计图标对象
    70. 

  70. 800, //宽
    71. 

  71. 600,//高
    72. 

  72. info //ChartRenderingInfo 信息
    73. 

  73. );
    74. 

  74. fos.close();
    75. 

  75. } catch (FileNotFoundException e) {
    76. 

  76. // TODO Auto-generated catch block
    77. 

  77. e.printStackTrace();
    78. 

  78. } catch (IOException e) {
    79. 

  79. // TODO Auto-generated catch block
    80. 

  80. e.printStackTrace();
    81. 

  81. }
    82. 

  82. }
    83. 





	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：     




    

  1. try{
    2. 

  2. 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
    3. 

  3. File file = new File(impath);
    4. 

  4. InputStream inputStream = null;
    5. 

  5. if(file.exists()){
    6. 

  6. try {
    7. 

  7. inputStream = new FileInputStream(file);
    8. 

  8. } catch (FileNotFoundException e) {
    9. 

  9. }
    10. 

  10. }
    11. 

  11. int i = inputStream.available();
    12. 

  12. byte data[] = new byte[i];
    13. 

  13. inputStream.read(data);
    14. 

  14. HttpServletResponse response = ServletActionContext.getResponse();
    15. 

  15. ServletOutputStream out = response.getOutputStream();
    16. 

  16. response.setContentType("image/jpeg");
    17. 

  17. out.write(data);
    18. 

  18. out.flush();
    19. 

  19. out.close();
    20. 

  20. }catch(IOException e){
    21. 

  21. e.printStackTrace();
    22. 

  22. }
    23. 





		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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