我使用下面的方法在excel中插入图片,但为什么在执行wwb.write时总是报java.lang.NullPointerExceptiontry {
WritableWorkbook wwb = Workbook.createWorkbook(new File("D:\\jbproject\\JspExcel\\book.xls"));
WritableSheet ws = wwb.createSheet("test", 0);
File file=new File("D:\\jbproject\\JspExcel\\midArea.png");
WritableImage wi = new WritableImage(0,0, 12, 14, file);
ws.addImage(wi);wwb.write();
wwb.close();
}
catch (Exception e) {
e.printStackTrace();
}
WritableWorkbook wwb = Workbook.createWorkbook(new File("D:\\jbproject\\JspExcel\\book.xls"));
WritableSheet ws = wwb.createSheet("test", 0);
File file=new File("D:\\jbproject\\JspExcel\\midArea.png");
WritableImage wi = new WritableImage(0,0, 12, 14, file);
ws.addImage(wi);wwb.write();
wwb.close();
}
catch (Exception e) {
e.printStackTrace();
}
解决方案 »
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