jfreechart
在网页显示图表，echart就很强大了，一般应用都可以了。但如果是生成图片文件，如果还是用echart,还要引入js引擎，太麻烦了。
可以用jfreechart,但要制定一些显示，会麻烦点，需要重载 jfreechart 的方法。但这也能感觉到编程的乐趣，我在扩展开源框架，哈哈。
比如在柱状图纵坐标和每个柱子的值后面加个"%"。可以这么用。
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>net.highersoft</groupId> <artifactId>jfreechart</artifactId> <version>0.0.1-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.jfree</groupId> <artifactId>jfreechart</artifactId> <version>1.5.3</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.5</version> </dependency> </dependencies> </project>
主类:
package com.xx.mp.report.service.impl;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtils;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTick;
import org.jfree.chart.axis.Tick;
import org.jfree.chart.axis.TickType;
import org.jfree.chart.axis.TickUnit;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.StandardBarPainter;
import org.jfree.chart.ui.RectangleEdge;
import org.jfree.chart.ui.RectangleInsets;
import org.jfree.chart.ui.TextAnchor;
import org.jfree.data.DataUtils;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.springframework.stereotype.Service;
/**
* https://tool.4xseo.com/a/3161.html
* @author chengzhong
*
*/
@Service
public class JFreeChartService {
public static void main(String[] args) {
String outPath="/template/dev/a.png";
LinkedHashMap<String,Double> dataMap=new LinkedHashMap<>();
dataMap.put("政府",10d);
dataMap.put("新闻媒体",20d);
dataMap.put("Ⅲ",5.0d);
dataMap.put("Ⅳ",45.0d);
dataMap.put("Ⅰ",15.0d);
JFreeChartService js=new JFreeChartService();
js.exportImg(dataMap,outPath,400, 300);
}
public void exportImg(LinkedHashMap<String,Double> dataMap,String outPath,int width,int height){
// 创建数据
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
for(Map.Entry<String,Double> entry:dataMap.entrySet()){
dataset.addValue(entry.getValue(), "A", entry.getKey());
}
//创建JFreeChart对象
JFreeChart chart = ChartFactory.createBarChart("", // 图标题
"", "", dataset, PlotOrientation.VERTICAL, false, true, false);
CategoryPlot plot = chart.getCategoryPlot();
//设置内边距
chart.setPadding(new RectangleInsets(5,3,3,3));
//CategoryItemRenderer renderer = plot.getRenderer();
//设置柱子
CustomRender renderer=new CustomRender();
//BarRenderer renderer = (BarRenderer) plot.getRenderer();
DecimalFormat df = new DecimalFormat("##.#");
//CategoryItemLabelGenerator generator = new StandardCategoryItemLabelGenerator("{2}", df);
CategoryItemLabelGenerator generator = new MyStandardCategoryItemLabelGenerator("{2}",df);
renderer.setDefaultItemLabelGenerator(generator);
renderer.setDefaultItemLabelsVisible(true);
plot.setBackgroundPaint(Color.white);
//设置边距
//plot.setInsets(new RectangleInsets(5, 3, 3, 3));
renderer.setDefaultFillPaint(new Color(0x61, 0x7d, 0xca));
StandardBarPainter sbp=new StandardBarPainter();
renderer.setBarPainter(sbp);
//renderer.setDefaultItemLabelPaint(new Color(0x61, 0x7d, 0xca));
renderer.setDefaultPaint(new Color(0x61, 0x7d, 0xca));
renderer.setShadowVisible(false);
renderer.setMaximumBarWidth(0.05);
plot.setRenderer(renderer);
ValueAxis va=plot.getRangeAxis();
MyNumberAxis ns[]=new MyNumberAxis[1];
ns[0]=new MyNumberAxis();
//设置纵坐标最大为110%
ns[0].setUpperBound(110);
plot.setRangeAxes(ns);
// plot.setWallPaint(Color.gray);
saveAsFile(chart, outPath, width, height);
}
public static void show(JFreeChart chart) {
// 利用awt进行显示
ChartFrame chartFrame = new ChartFrame("Test", chart);
chartFrame.pack();
chartFrame.setVisible(true);
}
// 保存为文件
public static void saveAsFile(JFreeChart chart, String outputPath, int weight, int height) {
FileOutputStream out = null;
try {
File outFile = new File(outputPath);
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
out = new FileOutputStream(outputPath);
// 保存为PNG文件
ChartUtils.writeChartAsPNG(out, chart, weight, height);
// 保存为JPEG文件
// ChartUtilities.writeChartAsJPEG(out, chart, 500, 400);
out.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
// do nothing
}
}
}
}
}
class CustomRender extends org.jfree.chart.renderer.category.IntervalBarRenderer {
private Paint[] colors;
// 初始化柱子颜色
private String[] colorValues = { "#FF0000", "#0070C0", "#00AF4E", "#7030A0" };
public CustomRender() {
colors = new Paint[colorValues.length];
for (int i = 0; i < colorValues.length; i++) {
colors[i] = Color.decode(colorValues[i]);
}
}
// 每根柱子以初始化的颜色不断轮循
public Paint getItemPaint(int i, int j) {
//return colors[j % colors.length];
return new Color(0x61, 0x7d, 0xca);
}
}
/**
* 改一处result[2]=value+"%";
* @author chengzhong
*
*/
class MyStandardCategoryItemLabelGenerator extends StandardCategoryItemLabelGenerator{
DecimalFormat df = new DecimalFormat("##.#");
NumberFormat percentFormat=NumberFormat.getPercentInstance();
public MyStandardCategoryItemLabelGenerator(String string, DecimalFormat df) {
super(string, df);
}
protected Object[] createItemArray(CategoryDataset dataset,
int row, int column) {
Object[] result = new Object[4];
result[0] = dataset.getRowKey(row).toString();
result[1] = dataset.getColumnKey(column).toString();
Number value = dataset.getValue(row, column);
if (value != null) {
/*
if (super.getNumberFormat() != null) {
result[2] = super.getNumberFormat().format(value);
}
else if (super.getDateFormat() != null) {
result[2] = super.getDateFormat().format(value);
}
*/
result[2]= df.format(value)+"%";
}
else {
result[2] = "-";
}
if (value != null) {
double total = DataUtils.calculateColumnTotal(dataset, column);
double percent = value.doubleValue() / total;
result[3] = percentFormat.format(percent);
}
return result;
}
}
/**
* 只改一处tickLabel=tickLabel+"%";
* @author chengzhong
*
*/
class MyNumberAxis extends NumberAxis{
protected List refreshTicksVertical(Graphics2D g2,
Rectangle2D dataArea, RectangleEdge edge) {
List result = new java.util.ArrayList();
result.clear();
Font tickLabelFont = getTickLabelFont();
g2.setFont(tickLabelFont);
if (isAutoTickUnitSelection()) {
selectAutoTickUnit(g2, dataArea, edge);
}
TickUnit tu = getTickUnit();
double size = tu.getSize();
int count = calculateVisibleTickCount();
double lowestTickValue = calculateLowestVisibleTickValue();
if (count <= ValueAxis.MAXIMUM_TICK_COUNT) {
int minorTickSpaces = getMinorTickCount();
if (minorTickSpaces <= 0) {
minorTickSpaces = tu.getMinorTickCount();
}
for (int minorTick = 1; minorTick < minorTickSpaces; minorTick++) {
double minorTickValue = lowestTickValue
- size * minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR, minorTickValue,
"", TextAnchor.TOP_CENTER, TextAnchor.CENTER,
0.0));
}
}
for (int i = 0; i < count; i++) {
double currentTickValue = lowestTickValue + (i * size);
String tickLabel;
NumberFormat formatter = getNumberFormatOverride();
if (formatter != null) {
tickLabel = formatter.format(currentTickValue);
}
else {
tickLabel = getTickUnit().valueToString(currentTickValue);
}
tickLabel=tickLabel+"%";
TextAnchor anchor;
TextAnchor rotationAnchor;
double angle = 0.0;
if (isVerticalTickLabels()) {
if (edge == RectangleEdge.LEFT) {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
angle = -Math.PI / 2.0;
}
else {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
angle = Math.PI / 2.0;
}
}
else {
if (edge == RectangleEdge.LEFT) {
anchor = TextAnchor.CENTER_RIGHT;
rotationAnchor = TextAnchor.CENTER_RIGHT;
}
else {
anchor = TextAnchor.CENTER_LEFT;
rotationAnchor = TextAnchor.CENTER_LEFT;
}
}
Tick tick = new NumberTick(currentTickValue, tickLabel, anchor,
rotationAnchor, angle);
result.add(tick);
double nextTickValue = lowestTickValue + ((i + 1) * size);
for (int minorTick = 1; minorTick < minorTickSpaces;
minorTick++) {
double minorTickValue = currentTickValue
+ (nextTickValue - currentTickValue)
* minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR,
minorTickValue, "", TextAnchor.TOP_CENTER,
TextAnchor.CENTER, 0.0));
}
}
}
}
return result;
}
}
配置柱子类:
class CustomRender extends org.jfree.chart.renderer.category.IntervalBarRenderer {
private Paint[] colors;
// 初始化柱子颜色
private String[] colorValues = { "#FF0000", "#0070C0", "#00AF4E", "#7030A0" };
public CustomRender() {
colors = new Paint[colorValues.length];
for (int i = 0; i < colorValues.length; i++) {
colors[i] = Color.decode(colorValues[i]);
}
}
// 每根柱子以初始化的颜色不断轮循
public Paint getItemPaint(int i, int j) {
//return colors[j % colors.length];
return new Color(0x61, 0x7d, 0xca);
}
}配置柱子上面的值，类：
/**
* 改一处result[2]=value+"%";
* @author chengzhong
*
*/
class MyStandardCategoryItemLabelGenerator extends StandardCategoryItemLabelGenerator{
NumberFormat percentFormat=NumberFormat.getPercentInstance();
public MyStandardCategoryItemLabelGenerator(String string, DecimalFormat df) {
super(string, df);
}
protected Object[] createItemArray(CategoryDataset dataset,
int row, int column) {
Object[] result = new Object[4];
result[0] = dataset.getRowKey(row).toString();
result[1] = dataset.getColumnKey(column).toString();
Number value = dataset.getValue(row, column);
if (value != null) {
/*
if (super.getNumberFormat() != null) {
result[2] = super.getNumberFormat().format(value);
}
else if (super.getDateFormat() != null) {
result[2] = super.getDateFormat().format(value);
}
*/
result[2]=value+"%";
}
else {
result[2] = "-";
}
if (value != null) {
double total = DataUtils.calculateColumnTotal(dataset, column);
double percent = value.doubleValue() / total;
result[3] = percentFormat.format(percent);
}
return result;
}
}配置纵坐标,类:
/**
* 只改一处tickLabel=tickLabel+"%";
* @author chengzhong
*
*/
class MyNumberAxis extends NumberAxis{
protected List refreshTicksVertical(Graphics2D g2,
Rectangle2D dataArea, RectangleEdge edge) {
List result = new java.util.ArrayList();
result.clear();
Font tickLabelFont = getTickLabelFont();
g2.setFont(tickLabelFont);
if (isAutoTickUnitSelection()) {
selectAutoTickUnit(g2, dataArea, edge);
}
TickUnit tu = getTickUnit();
double size = tu.getSize();
int count = calculateVisibleTickCount();
double lowestTickValue = calculateLowestVisibleTickValue();
if (count <= ValueAxis.MAXIMUM_TICK_COUNT) {
int minorTickSpaces = getMinorTickCount();
if (minorTickSpaces <= 0) {
minorTickSpaces = tu.getMinorTickCount();
}
for (int minorTick = 1; minorTick < minorTickSpaces; minorTick++) {
double minorTickValue = lowestTickValue
- size * minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR, minorTickValue,
"", TextAnchor.TOP_CENTER, TextAnchor.CENTER,
0.0));
}
}
for (int i = 0; i < count; i++) {
double currentTickValue = lowestTickValue + (i * size);
String tickLabel;
NumberFormat formatter = getNumberFormatOverride();
if (formatter != null) {
tickLabel = formatter.format(currentTickValue);
}
else {
tickLabel = getTickUnit().valueToString(currentTickValue);
}
tickLabel=tickLabel+"%";
TextAnchor anchor;
TextAnchor rotationAnchor;
double angle = 0.0;
if (isVerticalTickLabels()) {
if (edge == RectangleEdge.LEFT) {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
angle = -Math.PI / 2.0;
}
else {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
angle = Math.PI / 2.0;
}
}
else {
if (edge == RectangleEdge.LEFT) {
anchor = TextAnchor.CENTER_RIGHT;
rotationAnchor = TextAnchor.CENTER_RIGHT;
}
else {
anchor = TextAnchor.CENTER_LEFT;
rotationAnchor = TextAnchor.CENTER_LEFT;
}
}
Tick tick = new NumberTick(currentTickValue, tickLabel, anchor,
rotationAnchor, angle);
result.add(tick);
double nextTickValue = lowestTickValue + ((i + 1) * size);
for (int minorTick = 1; minorTick < minorTickSpaces;
minorTick++) {
double minorTickValue = currentTickValue
+ (nextTickValue - currentTickValue)
* minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR,
minorTickValue, "", TextAnchor.TOP_CENTER,
TextAnchor.CENTER, 0.0));
}
}
}
}
return result;
}
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