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 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
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;
}
3.struts.xml配置
<action name="chart2" class="Char2tAction">
<result name="success">/Chart.jsp</result>
</action>
4.效果图
二.生成图片保存到本地：
1.生成图片
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();
}
}
2.显示到jsp：
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();
}
时间： 2024-08-25 03:22:14