用Jfreechar 实现基于web 的折线图
应项目的需求，要做一个折现统计图，具体的效果如下：
需求中可以在统计年度，季度，月，星期的。其中核心代码是：
/**
* 绘图
* @return
* @throws IOException
* @throws ParseException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public String createChart() throws IOException, ParseException,
IllegalArgumentException, IllegalAccessException {
// 定义图标对象
JFreeChart chart = ChartFactory.createLineChart(null,// 报表题目，字符串类型
"交易时间", // 横轴
"交易数量", // 纵轴
this.createDataset(), // 获得数据集
PlotOrientation.VERTICAL, // 图标方向垂直
true, // 显示图例
false, // 不用生成工具
false // 不用生成URL地址
);
// 整个大的框架属于chart 可以设置chart的背景颜色
// 生成图形
CategoryPlot plot = chart.getCategoryPlot();
// 图像属性部分
plot.setBackgroundPaint(Color.white);
plot.setDomainGridlinesVisible(false); // 设置背景网格线是否可见
plot.setDomainGridlinePaint(Color.BLACK); // 设置背景网格线颜色
plot.setRangeGridlinePaint(Color.GRAY);
plot.setNoDataMessage("没有数据");// 没有数据时显示的文字说明。
// 数据轴属性部分
NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
rangeAxis.setAutoRangeIncludesZero(true); // 自动生成
rangeAxis.setUpperMargin(0.20);
rangeAxis.setLabelAngle(Math.PI / 2.0);
rangeAxis.setAutoRange(false);
// 数据渲染部分 主要是对折线做操作
LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot
.getRenderer();
renderer.setBaseItemLabelsVisible(true);
renderer.setSeriesPaint(0, Color.black); // 设置折线的颜色
renderer.setBaseShapesFilled(true);
renderer.setBaseItemLabelsVisible(true);
renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(
ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));
renderer
.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
renderer.setBaseItemLabelFont(new Font("Dialog", 1, 14)); // 设置提示折点数据形状
plot.setRenderer(renderer);
HttpSession session = request.getSession();
String filename = ServletUtilities.saveChartAsPNG(chart, 750, 600,
null, session);
String graphURL = request.getContextPath() + "/DisplayChart?filename="
+ filename;
ActionContext.getContext().put("graphURL", graphURL);
return "icon";
}
按星期统计的数据绑定：
/***************************
* 按星期统计交易统计
*
* @throws IllegalAccessException
* @throws IllegalArgumentException
* *
**************************/
private static final int FIRST_DAY = Calendar.MONDAY;
public DefaultCategoryDataset createDatasetByWeek() throws ParseException,
IllegalArgumentException, IllegalAccessException {
DefaultCategoryDataset linedatasetByWeekByWeek = new DefaultCategoryDataset();
// 曲线名称
String series = "市场交易统计"; // series指的就是报表里的那条数据线
// 横轴名称(列名称)
String[] time = new String[7];
Calendar calendar = Calendar.getInstance();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
while (calendar.get(Calendar.DAY_OF_WEEK) != FIRST_DAY) {
calendar.add(Calendar.DATE, -1);
}
for (int i = 0; i < 7; i++) {
time[i] = dateFormat.format(calendar.getTime()).toString();
calendar.add(Calendar.DATE, 1);
}
List purchaseinfonList = new ArrayList();
purchaseinfonList = tenant_purchaseinfoService.findResultListByWeek(
"%Y-%m-%d", time[0], time[6]);
int listlen = purchaseinfonList.size(); // 从数据库中查询出来的数据长度
int weeklen = time.length; // 月份的长度
// list 中的某条数据放到数组中
double[] arrList = new double[time.length];
String[] weekdate = new String[7];
// 取出星期
for (int i = 0; i < weeklen; i++) {
if (listlen < i + 1) {
weekdate[i] = "";
} else {
Map map = (Map) purchaseinfonList.get(i);
weekdate[i] = map.get("date").toString();
}
}
// 取出总数
for (int j = 0; j < listlen; j++) {
for (int i = 0; i < weeklen; i++) {
if (weekdate[j].equals(time[i])) {
Map map = (Map) purchaseinfonList.get(j);
arrList[i] = (Double) map.get("purchaseCount");
}
}
}
// 添加数据值
for (int i = 0; i < time.length; i++) {
linedatasetByWeekByWeek.addValue(arrList[i], series, // 值
time[i]); // 对应的横轴
}
return linedatasetByWeekByWeek;
}
按月统计的数据绑定：
/***
* 按月统计
* @return
*/
@SuppressWarnings("null")
public DefaultCategoryDataset createDatasetByMonth() {
DefaultCategoryDataset linedatasetByMonth = new DefaultCategoryDataset();
// 曲线名称
String series = "市场交易统计"; // series指的就是报表里的那条数据线
/********************************* 获取一个月的日期 ****************************************/
// 获取当前年份
Calendar cal = Calendar.getInstance();
// 横轴名称(列名称)
int monthInt = cal.get(Calendar.MONTH) + 1; // 获取当前月份
// 横轴名称(列名称)
String monthString = String.valueOf(monthInt);
int yearString = cal.get(Calendar.YEAR); // 获取当前年份
String[] time = null;
String[] monthdatestrStrings = null;
String[] timeValue = { "01", "02", "03", "04", "05", "06", "07", "08",
"09", "10", "11", "12", "13", "14", "15", "16", "17", "18",
"19", "20", "21", "22", "23", "24", "25", "26", "27", "28",
"29", "30", "31" };
switch (monthInt) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
time = new String[31];
monthdatestrStrings = new String[31];
for (int i = 0; i < 31; i++) {
time[i] = timeValue[i];
monthdatestrStrings[i] = timeValue[i];
}
break;
// 对于2月份需要判断是否为闰年
case 2:
if ((yearString % 4 == 0 && yearString % 100 != 0)
|| (yearString % 400 == 0)) {
time = new String[29];
monthdatestrStrings = new String[29];
for (int i = 0; i < 29; i++) {
time[i] = timeValue[i];
monthdatestrStrings[i] = timeValue[i];
}
break;
} else {
time = new String[28];
monthdatestrStrings = new String[28];
for (int i = 0; i < 28; i++) {
time[i] = timeValue[i];
monthdatestrStrings[i] = timeValue[i];
}
break;
}
case 4:
case 6:
case 9:
case 11:
time = new String[30];
monthdatestrStrings = new String[30];
for (int i = 0; i < 30; i++) {
time[i] = timeValue[i];
monthdatestrStrings[i] = timeValue[i];
}
break;
}
/*********************************** 获取一个月的日期结束 **************************************/
// 年度交易情况
List purchaseinfonList = new ArrayList();
purchaseinfonList = tenant_purchaseinfoService
.findResultListByYearOrMonth("%d", "%m", monthString);
int listlen = purchaseinfonList.size(); // 从数据库中查询出来的数据长度
int monthlen = time.length; // 月份的长度
int Dvalue = monthlen - listlen;
// list 中的某条数据放到数组中
double[] arrList = new double[time.length];
String[] monthdate = new String[monthdatestrStrings.length];
// 取出日期
for (int i = 0; i < monthlen; i++) {
if (listlen < i + 1) {
monthdate[i] = "";
} else {
Map map = (Map) purchaseinfonList.get(i);
monthdate[i] = map.get("month").toString();
}
}
// 取出总数
for (int j = 0; j < listlen; j++) {
for (int i = 0; i < monthlen; i++) {
if (monthdate[j].equals(time[i])) {
Map map = (Map) purchaseinfonList.get(j);
arrList[i] = (Double)map.get("purchaseCount");
}
}
}
// 添加数据值
for (int i = 0; i < time.length; i++) {
linedatasetByMonth.addValue(arrList[i], series, // 值
monthdatestrStrings[i]); // 对应的横轴
}
return linedatasetByMonth;
}
按季度统计的数据绑定：
/**
* 按季度统计
* @return
*/
@SuppressWarnings("null")
public DefaultCategoryDataset createDatasetByQuarter() {
DefaultCategoryDataset linedatasetByQuarter = new DefaultCategoryDataset();
// 曲线名称
String series = "市场交易统计"; // series指的就是报表里的那条数据线
/*********************************获取一个月的日期****************************************/
//获取当前年份
Calendar cal = Calendar.getInstance();
// 横轴名称(列名称)
int monthInt=cal.get(Calendar.MONTH)+1; //获取当前月份
// 横轴名称(列名称)
String monthString=String.valueOf(monthInt);
String yearString=String.valueOf(cal.get(Calendar.YEAR)); //获取当前年份
String[] time = new String[3];
String[] monthdatestrStrings =new String[3];
switch (monthInt) {
case 1:
case 2:
case 3:
String[] timeValue = { "1", "2", "3" };
for (int i = 0; i < timeValue.length; i++) {
time[i] = timeValue[i];
monthdatestrStrings[i] =monthString+"-"+timeValue[i];
}
break;
//对于2月份需要判断是否为闰年
case 4:
case 5:
case 6:
String[] timeValue1 = { "4", "5", "6" };
for (int i = 0; i < timeValue1.length; i++) {
time[i] = timeValue1[i];
monthdatestrStrings[i] =yearString+"-"+timeValue1[i];
}
break;
case 7:
case 8:
case 9:
String[] timeValue2 = { "7", "8", "9" };
for (int i = 0; i < timeValue2.length; i++) {
time[i] = timeValue2[i];
monthdatestrStrings[i] =yearString+"-"+timeValue2[i];
}
break;
case 10:
case 11:
case 12:
String[] timeValue3 = { "10", "11", "12" };
for (int i = 0; i < timeValue3.length; i++) {
time[i] = timeValue3[i];
monthdatestrStrings[i] =yearString+"-"+timeValue3[i];
}
break;
}
/***********************************获取一个月的日期结束**************************************/
// 年度交易情况
List purchaseinfonList = new ArrayList();
purchaseinfonList = tenant_purchaseinfoService.findResultListByQuarter(yearString,time[0],time[2] );
int listlen = purchaseinfonList.size(); // 从数据库中查询出来的数据长度
int monthlen = time.length; // 月份的长度
int Dvalue = monthlen - listlen;
//list 中的某条数据放到数组中
double[] arrList=new double[time.length];
String[] monthdate =new String[monthdatestrStrings.length];
// 取出日期
for (int i = 0; i < monthlen; i++) {
if (listlen < i + 1) {
monthdate[i] = "";
} else {
Map map = (Map) purchaseinfonList.get(i);
monthdate[i] = map.get("month").toString();
}
}
// 取出总数
for (int j = 0; j < listlen; j++) {
for (int i = 0; i < monthlen; i++) {
if (monthdate[j].equals(time[i])) {
Map map = (Map) purchaseinfonList.get(j);
arrList[i] = (Double)map.get("purchaseCount");
}
}
}
// 添加数据值
for (int i = 0; i < time.length; i++) {
linedatasetByQuarter.addValue(arrList[i], series, // 值
monthdatestrStrings[i]); // 对应的横轴
}
return linedatasetByQuarter;
}
按年统计的数据绑定：
/**
* 按年统计
* @return
*/
@SuppressWarnings("null")
public DefaultCategoryDataset createDatasetByYear() {
DefaultCategoryDataset linedatasetByYear = new DefaultCategoryDataset();
// 曲线名称
String series = "市场交易统计"; // series指的就是报表里的那条数据线
String[] time = new String[12];
String[] month = new String[12];
//获取当前年份
Calendar cal = Calendar.getInstance();
// 横轴名称(列名称)
String year=String.valueOf(cal.get(Calendar.YEAR));
System.out.println(cal.get(Calendar.YEAR));
System.out.println(year);
//设置1年12个月,为从数据库中取出每个月对应的统计数据
String[] timeValue = { "1", "2", "3", "4", "5", "6", "7", "8",
"9", "10", "11", "12" };
for (int i = 0; i < timeValue.length; i++) {
time[i] = timeValue[i];
month[i] =year+"-"+timeValue[i];
}
// 年度交易情况
List purchaseinfonList = new ArrayList();
purchaseinfonList = tenant_purchaseinfoService.findResultListByYearOrMonth("%c","%Y", year);
int listlen = purchaseinfonList.size(); // 从数据库中查询出来的数据长度
int monthlen = time.length; // 月份的长度
int Dvalue = monthlen - listlen;
//list 中的某条数据放到数组中
double[] arrList=new double[time.length];
String[] monthdate = new String[12];
// 取出月份
for (int i = 0; i < monthlen; i++) {
if (listlen < i + 1) {
monthdate[i] = "";
} else {
Map map = (Map) purchaseinfonList.get(i);
monthdate[i] = map.get("month").toString();
}
}
// 取出总数
for (int j = 0; j < listlen; j++) {
for (int i = 0; i < monthlen; i++) {
if (monthdate[j].equals(time[i])) {
Map map = (Map) purchaseinfonList.get(j);
arrList[i] = (Double)map.get("purchaseCount");
}
}
}
// 添加数据值
for (int i = 0; i < time.length; i++) {
linedatasetByYear.addValue(arrList[i], series, // 值
month[i]); // 对应的横轴
}
return linedatasetByYear;
}
刚开始做的时候，遇到的问题不少，感觉是一头乱麻，后来把问题分解分解再分解，一个个来解决，最后所有的问题都不再是问题了。