2021-10-08 easyexcel body自定义单元格合并，自定义列宽

body 自定义单元格合并

通过继承AbstractMergeStrategy类，重写merge方法实现自定义 从某行到某行，从某列到某列的合并。

AbstractMergeStrategy的实现

public class MyMergeStrategy extends AbstractMergeStrategy {
   
    //合并坐标
    /**
     * 合并的开始行
     */
    private int firstRow;
    /**
     * 合并的结束行
     */
    private int lastRow;
    /**
     * 合并的开始列
     */
    private int firstColumn;
    /**
     * 合并的结束列
     */
    private int lastColumn;

    public MyMergeStrategy(int firstRow, int lastRow, int firstColumn, int lastColumn) {
   
        this.firstRow = firstRow;
        this.lastRow = lastRow;
        this.firstColumn = firstColumn;
        this.lastColumn = lastColumn;
    }

    @Override
    protected void merge(Sheet sheet, Cell cell