web.xml中设置：

复制代码 代码如下:

<servlet>

<servlet-name>DisplayChart</servlet-name>

<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>

</servlet >

<servlet-mapping>

<servlet-name>DisplayChart</servlet-name>

<url-pattern>/DisplayChart</url-pattern>

</servlet-mapping>

java类中方法：

复制代码 代码如下:

public String getChart(String series[],double score[][],String type[],String name){

final int num=8;

DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();

for(int i=0;i<type.length;i++){

type[i]=type[i].substring(0, (type[i].length()<num)?type[i].length():num);

}

for(int j=0;j<series.length;j++){

int i=0;

for( i=0;i<type.length;i++){

defaultcategorydataset.addValue(score[j][i], series[j], type[i]);

}

}

JFreeChart jfreechart = ChartFactory.createLineChart(name,null,null,defaultcategorydataset,PlotOrientation.VERTICAL,true,true,false);

jfreechart.getLegend().setPosition(RectangleEdge.RIGHT);

jfreechart.setBackgroundPaint(Color.white);

CategoryPlot categoryplot = (CategoryPlot)jfreechart.getPlot();

categoryplot.setNoDataMessage("无数据可供显示！");

categoryplot.setBackgroundPaint(Color.white);

categoryplot.setDomainGridlinesVisible(true);

categoryplot.setRangeGridlinesVisible(true);

categoryplot.setRangeGridlinePaint(Color.gray);

categoryplot.setDomainGridlinePaint(Color.gray);

categoryplot.setBackgroundAlpha(0.8f);

Font font1 = new Font("黑体",Font.BOLD, 14);

jfreechart.getTitle().setFont(font1);

Font font3 = new Font("隶书",Font.BOLD, 12);

jfreechart.getLegend().setItemFont(font3);

CategoryAxis categoryaxis = categoryplot.getDomainAxis();

// categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);

categoryaxis.setMaximumCategoryLabelLines(10);//行数，根据需要自己设

categoryaxis.setMaximumCategoryLabelWidthRatio(0.5f);//每行宽度，这里设一个汉字宽

NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();

numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

numberaxis.setAutoRangeIncludesZero(true);

numberaxis.setRangeWithMargins(0, 3);

numberaxis.setUpperMargin(0.8);////设置最高的一个 Item 与图片顶端的距离

numberaxis.setUpperBound(3.5);//纵坐标最大值

categoryaxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12));

numberaxis.setTickLabelFont(new Font("隶书", Font.BOLD, 12));

Font font2 = new Font("SimSun", Font.BOLD, 16);

categoryaxis.setLabelFont(font2);

numberaxis.setLabelFont(font2);

categoryplot.setAxisOffset(new RectangleInsets(0D, 0D,0D, 10D));//设置曲线图与xy轴的距离

LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer)categoryplot.getRenderer();

lineandshaperenderer.setShapesVisible(true); //数据点可见

lineandshaperenderer.setSeriesStroke(0, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {

10F, 6F

}, 0.0F)); //定义series点之间的连线 ，这里是虚线，默认是直线

lineandshaperenderer.setSeriesStroke(1, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {

6F, 6F

}, 0.0F));

lineandshaperenderer.setBaseItemLabelsVisible(true);

lineandshaperenderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());

ChartRenderingInfo info=new ChartRenderingInfo(new StandardEntityCollection());

String fileName = null;

try

{

fileName = ServletUtilities.saveChartAsPNG(jfreechart, 700,300, info, null);//生成图片

}

catch (IOException e)

{

e.printStackTrace();

}

String graphURL = "/projectname/DisplayChart?filename=" + fileName; //projectname为对应项目的路径path,一般就是项目名称

//jsp中这样使用： String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;

return graphURL;//返回生成图片的地址

}

调用上述方法得到生成的chart的url：

复制代码 代码如下:

getChart(stus,score_field,type,"总分图");