1. 目的
根据已有数据，手动（java后台）生成图表至excel并导出。用于后台查询到数据后直接创建图表，可以代替直接使用图表信息字符串。
2. 说明
- 使用jfree图表绘制类库绘制图表，并生成到本地或读取至输出流用于在excel中生成；
- 使用poi操作excel；
3. 使用jar包
使用maven管理jar包，主要包含poi和jfree：
3.11
org.apache.poi
poi
${poi-version}
org.apache.poi
poi-ooxml
${poi-version}
org.apache.poi
poi-ooxml-schemas
${poi-version}
org.apache.poi
ooxml-schemas
1.1
jfree
jcommon
1.0.16
jfree
jfreechart
1.0.13
4. 实现
4.1 生成饼图
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import java.awt.*;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class TestPoiAndJfreeChart {
public static void main(String[] args) throws Exception {
// excel2003工作表
HSSFWorkbook wb = new HSSFWorkbook();
// 创建工作表
HSSFSheet sheet = wb.createSheet("Sheet 1");
// 创建字节输出流
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
//如 果不使用Font,中文将显示不出来
Font font = new Font("新宋体", Font.BOLD, 15);
// 创建数据：饼状图就是名称和值（比例）
Map map=new HashMap();
map.put("录播主机", (double) 1000);
map.put("编码器", (double) 700);
map.put("摄像机", (double) 600);
map.put("流转码服务器", (double) 400);
// 创建JFreeChart
JFreeChart chart = createPort("故障设备类型比例", map, font);
// 读取chart信息至字节输出流
ChartUtilities.writeChartAsPNG(byteArrayOut, chart, 600, 300);
// 画图的顶级管理器，一个sheet只能获取一个（一定要注意这点）
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// anchor主要用于设置图片的属性
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, (short) 2, (short) 1, (short) 12, (short) 15);
anchor.setAnchorType(3);
// 插入图片
patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG));
// excel2003后缀
FileOutputStream fileOut = new FileOutputStream("h://myExcel4.xls");
wb.write(fileOut);
fileOut.close();
}
public static JFreeChart createPort(String title, Map datas, Font font) {
try {
Set> set = datas.entrySet();
DefaultPieDataset pds = new DefaultPieDataset();
Iterator iterator = set.iterator();
Map.Entry entry;
while (iterator.hasNext()) {
entry = (Map.Entry) iterator.next();
pds.setValue(entry.getKey().toString(), Double.parseDouble(entry.getValue().toString()));
}
// 生成一个饼图的图表：显示图表的标题、组装的数据、是否显示图例、是否生成贴士以及是否生成URL链接
JFreeChart chart = ChartFactory.createPieChart(title, pds, true, false, true);
// 设置图片标题的字体
chart.getTitle().setFont(font);
// 得到图块,准备设置标签的字体
PiePlot plot = (PiePlot) chart.getPlot();
//设置分裂效果,需要指定分裂出去的key
// plot.setExplodePercent("摄像机", 0.1); 分裂效果，可选
// 设置标签字体
plot.setLabelFont(font);
// 设置图例项目字体
chart.getLegend().setItemFont(font);
// 设置开始角度
// plot.setStartAngle(new Float(3.14f / 2f)); 开始角度，意义不大
//设置plot的前景色透明度
plot.setForegroundAlpha(0.7f);
//设置plot的背景色透明度
plot.setBackgroundAlpha(0.0f);
//设置标签生成器(默认{0})
//{0}:key {1}:value {2}:百分比 {3}:sum
plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}({1})/{2}")); // 一般在{1}后面加单位，如：{0}({1}次)/{2}
//将内存中的图片写到本地硬盘
// ChartUtilities.saveChartAsJPEG(new File("H:/a.png"), chart, 600, 300);
return chart;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
4.2 生成折线图
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import java.awt.*;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class TestPoiAndJfreeChart1 {
public static void main(String[] args) throws Exception {
// excel2003工作表
HSSFWorkbook wb = new HSSFWorkbook();
// 创建工作表
HSSFSheet sheet = wb.createSheet("Sheet 1");
// 创建字节输出流
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
//如 果不使用Font,中文将显示不出来
Font font = new Font("新宋体", Font.BOLD, 15);
// 创建数据
Map> datas =new HashMap>();
Map map1=new HashMap();
Map map2=new HashMap();
Map map3=new HashMap();
Map map4=new HashMap();
Map map5=new HashMap();
map1.put("故障数量", (double) 20);
map2.put("故障数量", (double) 30);
map3.put("故障数量", (double) 25);
map4.put("故障数量", (double) 50);
map5.put("故障数量", (double) 40);
//压入数据
datas.put("一月", map1);
datas.put("二月", map2);
datas.put("三月", map3);
datas.put("四月", map4);
datas.put("五月", map5);
JFreeChart chart = createPort("故障数量-时间曲线", datas, "月份", "故障次数（次）", font);
// 读取chart信息至字节输出流
ChartUtilities.writeChartAsPNG(byteArrayOut, chart, 600, 300);
// 画图的顶级管理器，一个sheet只能获取一个（一定要注意这点）
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// anchor主要用于设置图片的属性
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, (short) 2, (short) 1, (short) 12, (short) 15);
anchor.setAnchorType(3);
// 插入图片
patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG));
// excel2003后缀
FileOutputStream fileOut = new FileOutputStream("h://myExcel5.xls");
wb.write(fileOut);
fileOut.close();
}
public static JFreeChart createPort(String title, Map> datas, String type, String unit, Font font) {
try {
DefaultCategoryDataset ds = new DefaultCategoryDataset();
Set>> set1 = datas.entrySet();
Iterator iterator1 = set1.iterator();
Iterator iterator2;
HashMap map;
Set> set2;
Map.Entry entry1;
Map.Entry entry2;
while (iterator1.hasNext()) {
entry1 = (Map.Entry) iterator1.next();
map = (HashMap) entry1.getValue();
set2 = map.entrySet();
iterator2 = set2.iterator();
while (iterator2.hasNext()) {
entry2 = (Map.Entry) iterator2.next();
ds.setValue(Double.parseDouble(entry2.getValue().toString()), entry2.getKey().toString(), entry1.getKey().toString());
}
}
//创建折线图,折线图分水平显示和垂直显示两种
// //2D折线图
JFreeChart chart = ChartFactory.createLineChart(title, type, unit, ds, PlotOrientation.VERTICAL, true, true, true);
// //3D折线图
// JFreeChart chart2 = ChartFactory.createLineChart3D(title, type, unit, ds, PlotOrientation.VERTICAL, true, true, false);
//设置整个图片的标题字体
chart.getTitle().setFont(font);
//设置提示条字体
font = new Font("宋体", Font.BOLD, 15);
chart.getLegend().setItemFont(font);
//得到绘图区
CategoryPlot plot = (CategoryPlot) chart.getPlot();
//得到绘图区的域轴(横轴),设置标签的字体
plot.getDomainAxis().setLabelFont(font);
//设置横轴标签项字体
plot.getDomainAxis().setTickLabelFont(font);
//设置范围轴(纵轴)字体
font = new Font("宋体", Font.BOLD, 18);
plot.getRangeAxis().setLabelFont(font);
// plot.setForegroundAlpha(1.0f);
return chart;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
4.3 生成柱状图
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import java.awt.*;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class TestPoiAndJfreeChart2 {
public static void main(String[] args) throws Exception {
// excel2003工作表
HSSFWorkbook wb = new HSSFWorkbook();
// 创建工作表
HSSFSheet sheet = wb.createSheet("Sheet 1");
// 创建字节输出流
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
//如 果不使用Font,中文将显示不出来
Font font = new Font("新宋体", Font.BOLD, 15);
// 创建数据
Map> datas =new HashMap>();
Map map1=new HashMap();
Map map2=new HashMap();
Map map3=new HashMap();
map1.put("故障数", (double) 1000);
map2.put("故障数", (double) 1300);
map3.put("故障数", (double) 1000);
//压入数据
datas.put("设备网络掉线", map1);
datas.put("CPU利用率高", map2);
datas.put("磁盘占用高", map3);
JFreeChart chart = createPort("故障类型比例",datas,"故障类型","数量单位（个）",font);
// 读取chart信息至字节输出流
ChartUtilities.writeChartAsPNG(byteArrayOut, chart, 600, 300);
// 画图的顶级管理器，一个sheet只能获取一个（一定要注意这点）
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// anchor主要用于设置图片的属性
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, (short) 2, (short) 1, (short) 12, (short) 15);
anchor.setAnchorType(3);
// 插入图片
patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG));
// excel2003后缀
FileOutputStream fileOut = new FileOutputStream("h://myExcel6.xls");
wb.write(fileOut);
fileOut.close();
}
public static JFreeChart createPort(String title,Map> datas,String type,String danwei,Font font){
try {
//种类数据集
DefaultCategoryDataset ds = new DefaultCategoryDataset();
//获取迭代器：
Set>> set1 = datas.entrySet();
Iterator iterator1= set1.iterator();
Iterator iterator2;
HashMap map;
Set> set2;
Map.Entry entry1;
Map.Entry entry2;
while(iterator1.hasNext()){
entry1=(Map.Entry) iterator1.next();
map=(HashMap) entry1.getValue();
set2=map.entrySet();
iterator2=set2.iterator();
while (iterator2.hasNext()) {
entry2= (Map.Entry) iterator2.next();
ds.setValue(Double.parseDouble(entry2.getValue().toString()), entry2.getKey().toString(), entry1.getKey().toString());
}
}
//创建柱状图,柱状图分水平显示和垂直显示两种
JFreeChart chart = ChartFactory.createBarChart(title, type, danwei, ds, PlotOrientation.VERTICAL, true, true, true);
//设置整个图片的标题字体
chart.getTitle().setFont(font);
//设置提示条字体
font = new Font("宋体", Font.BOLD, 15);
chart.getLegend().setItemFont(font);
//得到绘图区
CategoryPlot plot = (CategoryPlot) chart.getPlot();
//得到绘图区的域轴(横轴),设置标签的字体
plot.getDomainAxis().setLabelFont(font);
//设置横轴标签项字体
plot.getDomainAxis().setTickLabelFont(font);
//设置范围轴(纵轴)字体
plot.getRangeAxis().setLabelFont(font);
plot.setForegroundAlpha(1.0f);
return chart;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
5. 补充
上图是在excel中创建图表的简单方式。具体样式或者构造图表的方法可以参考API自行定义。参考链接：http://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/ChartFactory.html
https://www.open-open.com/wenku/tag/jfreechart.html