HSSFWorkbook 合并单元格后没有边框

在使用HSSFWorkbook进行合并单元格后，出现了没有边框的问题。可以通过以下步骤解决这个问题：

1. 首先，创建一个需要合并单元格的样式。使用`wb.createCellStyle()`创建一个样式对象，然后设置垂直居中和水平居中对齐，使用`boderStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER)`和`boderStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER)`。接着设置边框样式，可以使用`boderStyle.setBorderTop(HSSFBorderFormatting.BORDER_THICK)`来设置顶部边框为粗线。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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