java excel chart_Java 添加、读取、删除Excel中的图表趋势线
时间: 2023-11-22 17:56:06 浏览: 39
Java可以使用Apache POI库来操作Excel文件,包括添加、读取、删除图表趋势线。
添加图表趋势线:
```java
// 创建一个趋势线对象
XSSFChart chart = (XSSFChart) sheet.createDrawingPatriarch().createChart(anchor);
XSSFCategoryAxis bottomAxis = chart.createCategoryAxis(AxisPosition.BOTTOM);
XSSFValueAxis leftAxis = chart.createValueAxis(AxisPosition.LEFT);
XSSFLineChartData data = chart.createLineChartData("趋势线");
// 添加数据
XSSFChartLineChartData.Series series = data.addSeries(bottomAxis, leftAxis);
series.addPoint(new XSSFChartLineChartData.DataPoint(0, 2));
series.addPoint(new XSSFChartLineChartData.DataPoint(1, 3));
series.addPoint(new XSSFChartLineChartData.DataPoint(2, 4));
// 添加趋势线
XSSFChartTrendline trendline = series.addTrendline(0, TrendlineType.LINEAR);
trendline.setDisplayEquation(true);
trendline.setDisplayRSquared(true);
```
读取图表趋势线:
```java
// 读取Excel文件
File file = new File("/path/to/file.xlsx");
Workbook workbook = WorkbookFactory.create(file);
Sheet sheet = workbook.getSheetAt(0);
// 获取图表对象
XSSFDrawing drawing = sheet.getDrawingPatriarch();
for (XSSFShape shape : drawing.getShapes()) {
if (shape instanceof XSSFChart) {
XSSFChart chart = (XSSFChart) shape;
for (XSSFChartSeries series : chart.getSeries()) {
for (XSSFChartTrendline trendline : series.getTrendlines()) {
// 获取趋势线方程和R-squared值
String equation = trendline.getEquation();
double rSquared = trendline.getRSquared();
}
}
}
}
```
删除图表趋势线:
```java
// 获取趋势线对象并删除
XSSFChartTrendline trendline = series.getTrendline(0);
series.removeTrendline(trendline);
```
相关推荐
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![application/x-zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)