java生成饼图svg及JFreeChart生成svg图表
作者：jhmyuan
java生成饼图svg，代码实现感觉有点复杂，个人认为不如用JFreeChart，这篇文章主要介绍java生成饼图svg及JFreeChart生成svg图表，有需要的小伙伴可以参考下
Jfreechart本身不能生成SVG图形,但是可以借助另外一个东西,辅助生成.好像是这个:batik ，具体代码请看下文
一：Java生成svg饼图,附带了一个标签显示各个颜色代表的部分
package com.tellhow.svg;
import java.io.File;
import java.io.FileOutputStream;
/**
*
* @author 风絮NO.1
*
*/
public class CakySvgWithLabel {
//定义不同的颜色
static String[] colors ={"#f2e692", "#aa1111",
"#799AE1", "#3e941b",
"#66cc00", "#297110",
"#d6a97b", "#82522b",
"#aaaaff", "#1111aa",
"#ff2222", "#ffaaaa"};
static String initialize(double [] percents,String[]names){
StringBuffer sfile = new StringBuffer();
sfile.append("<?xml version='1.0' encoding='UTF-8'?>");
sfile.append("\n");
sfile.append("<svg xmlns:svg='http://www.w3.org/2000/svg'");
sfile.append("\n");
sfile.append("xmlns='http://www.w3.org/2000/svg'");
sfile.append("\n");
sfile.append("xmlns:xlink='http://www.w3.org/1999/xlink'");
sfile.append("\n");
sfile.append("xml:space='default'");
sfile.append("\n");
sfile.append("version='1.1' width='100%' height='100%' viewBox='0 0 2024 570'>");
sfile.append("\n");
sfile.append("<defs></defs>");
sfile.append("\n");
sfile.append("<g stroke-width='1' stroke='#FFFFFF' transform='matrix(1,0,0,1,16.384,-9.83)' xmlns='http://www.w3.org/2000/svg'>");
sfile.append("\n");
//循环创造path标签.
String path =creatPath(502, 300, 300, percents,names);//中心点式503,300.
sfile.append(path);
sfile.append("</g>");
sfile.append("\n");
sfile.append("</svg>");
return sfile.toString();
}
/**
*
* @param x0 中心点横坐标
* @param y0 中心点纵坐标
* @param r 半径
* @param percents 百分比数组
* @param names 显示颜色代表的名称
* @return
*/
public static String creatPath(double x0,double y0,double r,double[]percents,String[]names){
StringBuffer sfile =new StringBuffer();
double x1=0; //新扇形的x坐标
double y1=0; //新扇形的y坐标
double middleX=0; //文本显示的坐标,包括竖线显示的坐标
double middleY=0;
double radian =0; //弧度
double textRadian=0; //文本显示位置度弧度
double k=0;
int N=10;
for(int i=0;i<percents.length;i++){
if(i==0){
radian =getRadian(percents[0]);
textRadian=radian/2;
x1 = (x0+getCos(radian)*r);
y1 = (y0-getSin(radian)*r);
middleX=(x0+getCos(textRadian)*r);
middleY=(y0-getSin(textRadian)*r);
double percent = Math.round(percents[0]*100)/100.0;//获得精确到两位小数点的坐标.
k=Math.abs((middleY-y0)/(middleX-x0));//获得扇形终点的坐标,与中心点连成的直线的斜率.(取正值)
double sita= Math.atan(k);//求斜角
double lineLen=50;
double textLen=70;
if(radian<6){
lineLen=90;
textLen=110;//控制指示线的长度,与文字的位置
}
if(percents[i]!=0){//当一个类型为0时，饼图展示
if((textRadian<(Math.PI/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI/2)&&textRadian<Math.PI)){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI)&&textRadian<(Math.PI*3/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY+(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if((textRadian>(Math.PI*3/2)&&textRadian<(Math.PI*2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY+Math.sin(sita)*lineLen)+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}
sfile.append("\n");
if(getRadian(percents[0])>Math.PI){
sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+r)+" "+r+" A "+r+" "+r+" 0 1 0 "+x1+" "+y1+" L "+x0+" "+y0+" z' fill='"+colors[0]+"'/>");
}else{
sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+r)+" "+r+" A "+r+" "+r+" 0 0 0 "+x1+" "+y1+" L "+x0+" "+y0+" z' fill='"+colors[0]+"'/>");
}
sfile.append("\n");
}
sfile.append("<rect x='"+(x0+2*r)+"' y='"+(y0-r/2.0+N)+"' width='60' height='30' fill='"+colors[i]+"' stroke='#FFFFFF' stroke-dasharray='1,1' />");
sfile.append("\n");
sfile.append("<text x='"+(x0+2*r+80)+"' y='"+(y0-r/2.0+N+25)+"' space='preserve' font-family='宋体' font-size='28' fill='"+colors[0]+"' stroke='#000000' stroke-dasharray='1,1' baseline-shift='baseline'>"+names[0]+"</text>");
sfile.append("\n");
}else{
textRadian = radian+(getRadian(percents[i])/2);//获取指示线与X轴的弧度.
radian =radian+getRadian(percents[i]);//第i个扇形前面的弧度的总和
middleX=(x0+getCos(textRadian)*r);
middleY=(y0-getSin(textRadian)*r);
double percent = Math.round(percents[i]*100)/100.0;
k=Math.abs((middleY-y0)/(middleX-x0));
double lineLen=50;
double textLen=70;
if(radian<6){
lineLen=90;
textLen=110;
}
double sita= Math.atan(k);
if(percents[i]!=0){//当一个类型为0时，饼图展示
if((textRadian<(Math.PI/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI/2)&&textRadian<Math.PI)){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if ((textRadian>(Math.PI)&&textRadian<(Math.PI*3/2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY+(Math.sin(sita)*lineLen))+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}else if((textRadian>(Math.PI*3/2)&&textRadian<(Math.PI*2))){
sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY+Math.sin(sita)*lineLen)+"' stroke='#000000'/>");
sfile.append("\n");
sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>");
}
sfile.append("\n");
// 参数 1 表示 画大于180的弧, 0 表示画小于180的弧 (这个地方比较重要)
if(getRadian(percents[i])>Math.PI){
sfile.append("<path d='M "+x0+" "+y0+" L "+x1+" "+y1+" A "+r+" "+r+" 0 1 0 "+(x1=x0+getCos(radian)*r)+" "+(y1=y0-getSin(radian)*r)+" L "+x0+" "+y0+" z' fill='"+colors[i]+"'/>");
}else{
sfile.append("<path d='M "+x0+" "+y0+" L "+x1+" "+y1+" A "+r+" "+r+" 0 0 0 "+(x1=x0+getCos(radian)*r)+" "+(y1=y0-getSin(radian)*r)+" L "+x0+" "+y0+" z' fill='"+colors[i]+"'/>");
}
sfile.append("\n");
}
N+=50;
sfile.append("<rect x='"+(x0+2*r)+"' y='"+(y0-r/2.0+N)+"' width='60' height='30' fill='"+colors[i]+"' stroke='#FFFFFF' stroke-dasharray='1,1' />");
sfile.append("\n");
sfile.append("<text x='"+(x0+2*r+80)+"' y='"+(y0-r/2.0+N+25)+"' space='preserve' font-family='宋体' font-size='28' fill='"+colors[0]+"' stroke='#000000' stroke-dasharray='1,1' baseline-shift='baseline'>"+names[i]+"</text>");
sfile.append("\n");
}
}
return sfile.toString();
}
//返回弧度
public static double getRadian(double fenshu){
return (fenshu*Math.PI)/50;
}
//返回正弦
public static double getSin(double radian){
return Math.sin(radian);
}
//返回余弦
public static double getCos(double radian){
return Math.cos(radian);
}
public static void main(String[] args) {
int[] data= {3,64,0,284,10};
String[] names={"主变:"+data[0]+"个","断路器:"+data[1]+"个","线路:"+data[2]+"个","刀闸:"+data[3]+"个","母线:"+data[4]+"个"};
create(data,names);
}
private static void create(int[] data,String[] names) {
try {
createSVG("d:/a.svg",getPercent(data),names);
} catch (Exception e) {
e.printStackTrace();
}
}
private static double[] getPercent(int data[]){
double sum=0;
double percents[] = new double[data.length];
for(int i=0;i<data.length;i++){
sum+=data[i];
}
for(int i=0;i<data.length;i++){
percents[i] =(data[i]/sum)*100;
}
return percents;
}
public static void createSVG(String fileRealPath, double[] percents,String[] names) throws Exception {
String sFile = initialize(percents,names);
try {
byte[] byteFil = sFile.getBytes("UTF-8");
File svgFile = new File(fileRealPath);
if (svgFile.exists()) {
svgFile.delete();
}
FileOutputStream fos = new FileOutputStream(svgFile);
fos.write(byteFil);
fos.close();
} catch (Exception ex) {
System.out.print(ex.getMessage());
}
}
}
二.java生成SVG 3D饼图.
(这个可以生成图形,但是不完善,我没有再修改代码啦,因为觉得这个东西不值,用jfreechart可能更好.功能更强到,只是这几个程序,让我更加了解了svg这个东西,里面的一些标签都干什么用的.等等.) 3D的这个,生成的效果图,会有断层的效果,主要是出现在第一现象和第四象限,即如果第一象限或第四象限,有两个扇形的话,就会出现断层,可以用这个工具进行调整:SVGDeveloper. 用它打开svg图形,然后将断层的扇形的代码,重新倒序排列一下.
package com.xj.svg;
import java.io.File;
import java.io.FileOutputStream;
public class Caky3DSVG {
static String[] colors ={"#d6a97b",
"#22FF22", "#aaffaa", "#799AE1",
"#9aabEe", "#3e941b", "#f2e692",
"#66cc00", "#297110", "#d6a97b",
"#82522b", "#aaaaff", "#1111aa",
"#ff2222", "#ffaaaa", "#aa1111"
};
public static void main(String[] args) {
double data[] = {20,20,50};
try {
createSVG("f:/f.svg",getPercent(data));
} catch (Exception e) {
e.printStackTrace();
}
}
static String initialize(double [] percent){
double percents[] = {10,15,5,20,40,10};
StringBuffer sfile = new StringBuffer();
sfile.append("<?xml version='1.0' encoding='UTF-8'?>");
sfile.append("\n");
sfile.append("<svg xmlns:svg='http://www.w3.org/2000/svg'");
sfile.append("\n");
sfile.append("xmlns='http://www.w3.org/2000/svg'");
sfile.append("\n");
sfile.append("xmlns:xlink='http://www.w3.org/1999/xlink'");
sfile.append("\n");
sfile.append("xml:space='default'");
sfile.append("\n");
sfile.append("version='1.1' width='100%' height='100%' viewBox='0 0 1024 600'>");
sfile.append("\n");
sfile.append("<defs></defs>");
sfile.append("\n");
String path = createPath(502, 300,300, 150, percents);
sfile.append(path);
sfile.append("</g>");
sfile.append("\n");
sfile.append("</svg>");
return sfile.toString();
}
/**
*
* @param x0 原点 X
* @param y0 原点 Y
* @param langR
* @param shortR
* @param fenshu
* @return
*/
static String createPath(double x0,double y0,double langR,double shortR ,double percents[]){
StringBuffer sfile = new StringBuffer();
double xBottom =0;
double yBottom =0;
double xBottom1=0;
double yBottom1=0;
double radian =0;
sfile.append("<g stroke-width='1' stroke='#000000' transform='matrix(1,0,0,1,1.638,-9.83)' xmlns='http://www.w3.org/2000/svg'>");
sfile.append("\n");
for(int i=0;i<percents.length;i++){
System.out.println("i:"+i);
radian =radian+getRadian(percents[i]);//第i个扇形到 第一个扇形,弧度的总和.
System.out.println("弧度2:"+radian);
if (i==0){
System.out.println("弧度1:"+radian);
if(radian==Math.PI/2){
xBottom = x0;//底面的x坐标
yBottom = y0-shortR;//底面的y坐标
}else if(radian==Math.PI*3/2){
xBottom = x0;//底面的x坐标
yBottom = y0+shortR;//底面的y坐标
} else{
double tanRadian = Math.abs(Math.tan(radian));
double sqValue=shortR*shortR+tanRadian*tanRadian*langR*langR;
if(radian<Math.PI/2){
System.out.println("if1:"+radian);
xBottom = x0+(langR*shortR)/Math.sqrt(sqValue);//底面的x坐标
yBottom = y0-(tanRadian*langR*shortR)/Math.sqrt(sqValue);//底面的y坐标
}
else if (radian>Math.PI/2&&radian<=Math.PI){
System.out.println("if2:"+radian);
xBottom =x0-(langR*shortR)/Math.sqrt(sqValue);
yBottom =y0-(tanRadian*langR*shortR)/Math.sqrt(sqValue);
}else if (radian>Math.PI&&radian<Math.PI*3/2){
System.out.println("if3:"+radian);
xBottom =x0-(langR*shortR)/Math.sqrt(sqValue);
yBottom =y0+(tanRadian*langR*shortR)/Math.sqrt(sqValue);
}else if (radian>Math.PI*3/2&&radian<Math.PI*2){
System.out.println("if4:"+radian);
xBottom = x0+(langR*shortR)/Math.sqrt(sqValue);
yBottom = y0+(tanRadian*langR*shortR)/Math.sqrt(sqValue);
}
}
if(getRadian(percents[0])>Math.PI){//大于 PI 弧度,即百分比超过50%
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+langR)+" "+y0+" A "+langR+" "+shortR+" 0 1 0 "+xBottom+" "+yBottom+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+(x0+langR)+" "+(y0-50)+" A "+langR+" "+shortR+" 0 1 0 "+xBottom+" "+(yBottom-50)+" L "+xBottom+" "+yBottom+" A "+langR+" "+shortR+" 0 1 1 "+(x0+langR)+" "+y0+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+(y0-50)+" L "+(x0+langR)+" "+(y0-50)+" A "+langR+" "+shortR+" 0 1 0 "+xBottom+" "+(yBottom-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}else{
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+langR)+" "+y0+" A "+langR+" "+shortR+" 0 0 0 "+xBottom+" "+yBottom+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+(x0+langR)+" "+(y0-50)+" A "+langR+" "+shortR+" 0 0 0 "+xBottom+" "+(yBottom-50)+" L "+xBottom+" "+yBottom+" A "+langR+" "+shortR+" 0 0 1 "+(x0+langR)+" "+y0+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+(y0-50)+" L "+(x0+langR)+" "+(y0-50)+" A "+langR+" "+shortR+" 0 0 0 "+xBottom+" "+(yBottom-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}
}else{
if(radian==Math.PI/2){
xBottom1= x0;//底面的x坐标
yBottom1= y0-shortR;//底面的y坐标
}else if(radian==Math.PI*3/2){
xBottom1 = x0;//底面的x坐标
yBottom1 = y0+shortR;//底面的y坐标
} else{
double tanRadian = Math.abs(Math.tan(radian));
double sqValue=shortR*shortR+tanRadian*tanRadian*langR*langR;
if(radian<Math.PI/2){
System.out.println("if1:"+radian);
xBottom1 = x0+(langR*shortR)/Math.sqrt(sqValue);//底面的x坐标
yBottom1 = y0-(tanRadian*langR*shortR)/Math.sqrt(sqValue);//底面的y坐标
}
else if (radian>Math.PI/2&&radian<=Math.PI){
System.out.println("if2:"+radian);
xBottom1 =x0-(langR*shortR)/Math.sqrt(sqValue);
yBottom1 =y0-(tanRadian*langR*shortR)/Math.sqrt(sqValue);
}else if (radian>Math.PI&&radian<Math.PI*3/2){
System.out.println("if3:"+radian);
xBottom1 =x0-(langR*shortR)/Math.sqrt(sqValue);
yBottom1 =y0+(tanRadian*langR*shortR)/Math.sqrt(sqValue);
}else if (radian>Math.PI*3/2){
System.out.println("if4:"+radian);
xBottom1 = x0+(langR*shortR)/Math.sqrt(sqValue);
yBottom1 = y0+(tanRadian*langR*shortR)/Math.sqrt(sqValue);
}
}
if(getRadian(percents[i])>Math.PI){//大于 PI 弧度,即百分比超过50%
System.out.println("大于pi");
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+y0+" L "+xBottom+" "+yBottom+" A "+langR+" "+shortR+" 0 1 0 "+xBottom1+" "+yBottom1+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+(xBottom)+" "+(yBottom-50)+" A "+langR+" "+shortR+" 0 1 0 "+xBottom1+" "+(yBottom1-50)+" L "+xBottom1+" "+yBottom1+" A "+langR+" "+shortR+" 0 1 1 "+xBottom+" "+yBottom+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+(y0-50)+" L "+(xBottom)+" "+(yBottom-50)+" A "+langR+" "+shortR+" 0 1 0 "+xBottom1+" "+(yBottom1-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}else{
System.out.println("小于pi");
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+y0+" L "+xBottom+" "+yBottom+" A "+langR+" "+shortR+" 0 0 0 "+xBottom1+" "+yBottom1+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+(xBottom)+" "+(yBottom-50)+" A "+langR+" "+shortR+" 0 0 0 "+xBottom1+" "+(yBottom1-50)+" L "+xBottom1+" "+yBottom1+" A "+langR+" "+shortR+" 0 0 1 "+xBottom+" "+yBottom+" z' />");
sfile.append("\n");
sfile.append("<path d='M "+x0+" "+(y0-50)+" L "+(xBottom)+" "+(yBottom-50)+" A "+langR+" "+shortR+" 0 0 0 "+xBottom1+" "+(yBottom1-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}
xBottom=xBottom1;
yBottom=yBottom1;
}
}
return sfile.toString();
}
//返回弧度
public static double getRadian(double percent){
return (percent*Math.PI)/50;
}
//返回正弦
public static double getSin(double radian){
return Math.sin(radian);
}
//返回余弦
public static double getCos(double radian){
return Math.cos(radian);
}
private static double[] getPercent(double data[]){
double sum=0;
double percents[] = new double[data.length];
for(int i=0;i<data.length;i++){
sum+=data[i];
}
for(int i=0;i<data.length;i++){
percents[i] =(data[i]/sum)*100;
}
return percents;
}
public static void createSVG(String fileRealPath, double[] percents) throws Exception {
String sFile = initialize(percents);
try {
byte[] byteFil = sFile.getBytes("UTF-8");
File svgFile = new File(fileRealPath);
if (svgFile.exists()) {
svgFile.delete();
}
FileOutputStream fos = new FileOutputStream(svgFile);
fos.write(byteFil);
fos.close();
} catch (Exception ex) {
System.out.print(ex.getMessage());
}
}
}
三.使用Jfreechart动态生成svg图形:
import java.awt.Rectangle;
import java.io.*;
import org.jfree.chart.*;
import org.apache.batik.dom.GenericDOMImplementation;
import org.apache.batik.svggen.SVGGraphics2D;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.chart.plot.*;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
/**
* 该类用于演示最简单的柱状图生成
*/
public class BarChartDemo {
public static void main(String[] args) throws IOException {
CategoryDataset dataset = getDataSet();
// 创建JFreeChart对象，在内存中间创建出对应的图像
JFreeChart chart = ChartFactory.createBarChart3D("水果产量图", // 图表标题
"水果", // 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：水平、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
);
File fo_svg = new File("D:\\fruit3.svg");
Rectangle bounds = new Rectangle(0,0,400,300);
exportChartAsSVG(chart,bounds,fo_svg);
}
private static void exportChartAsJPG() throws FileNotFoundException, IOException {
// 得到数据Dataset
CategoryDataset dataset = getDataSet();
// 创建JFreeChart对象，在内存中间创建出对应的图像
JFreeChart chart = ChartFactory.createBarChart3D("水果产量图", // 图表标题
"水果", // 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：水平、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
);
FileOutputStream fos_jpg = null;
try {
fos_jpg = new FileOutputStream("D:/fruit3.jpg");
ChartUtilities.writeChartAsJPEG(fos_jpg, 1, chart, 400, 300, null);
} finally {
try {
fos_jpg.close();
} catch (Exception e) {
}
}
}
/**
* 获取一个演示用的简单数据集对象
*
* @return
*/
private static CategoryDataset getDataSet() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(100, "1", "葡萄");
dataset.addValue(200, "1", "梨子");
dataset.addValue(200, "1", "荔枝");
dataset.addValue(300, "2", "葡萄");
dataset.addValue(400, "2", "梨子");
dataset.addValue(500, "2", "荔枝");
return dataset;
}
/**
* 获取一个演示用的组合数据集对象
*
* @return
*/
private static CategoryDataset getDataSet2() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(100, "北京", "苹果");
dataset.addValue(100, "上海", "苹果");
dataset.addValue(100, "广州", "苹果");
dataset.addValue(200, "北京", "梨子");
dataset.addValue(200, "上海", "梨子");
dataset.addValue(200, "广州", "梨子");
dataset.addValue(300, "北京", "葡萄");
dataset.addValue(300, "上海", "葡萄");
dataset.addValue(300, "广州", "葡萄");
dataset.addValue(400, "北京", "香蕉");
dataset.addValue(400, "上海", "香蕉");
dataset.addValue(400, "广州", "香蕉");
dataset.addValue(500, "北京", "荔枝");
dataset.addValue(500, "上海", "荔枝");
dataset.addValue(500, "广州", "荔枝");
return dataset;
}
/**
* Exports a JFreeChart to a SVG file.
*
* @param chart JFreeChart to export
* @param bounds the dimensions of the viewport
* @param svgFile the output file.
* @throws IOException if writing the svgFile fails.
*/
private static void exportChartAsSVG(JFreeChart chart, Rectangle bounds, File svgFile) throws IOException {
// Get a DOMImplementation and create an XML document
DOMImplementation domImpl =
GenericDOMImplementation.getDOMImplementation();
Document document = domImpl.createDocument(null, "svg", null);
// Create an instance of the SVG Generator
SVGGraphics2D svgGenerator = new SVGGraphics2D(document);
// draw the chart in the SVG generator
chart.draw(svgGenerator, bounds);
// Write svg file
OutputStream outputStream = new FileOutputStream(svgFile);
Writer out = new OutputStreamWriter(outputStream, "UTF-8");
svgGenerator.stream(out, true /* use css */);
outputStream.flush();
outputStream.close();
}
}
用这个的时候需要注意两点:
1 .jfreechart本身不能生成svg图形,需要用到batik .一个java工具包,apache的.
batik-awt-util.jar
batik-dom.jar
batik-svggen.jar
batik-util.jar
batik-xml.jar
jfreechart-1.0.0.jar
2.就是可能生成svg,当你查看的时候不支持中文. 我记得好像是如果是安装的adobe的那个查看器,在IE里面浏览的话好像是中文乱码,如果用另外一个叫做 Renesis SVG Player ,这个查看器就是支持中文的.
以上内容就是java生成饼图svg及JFreeChart生成svg图表的全部内容，希望大家喜欢。