Easyexcel sets row hiding to solve the problem of sethidden (true) invalidation

1、 Preface

easyExcel Provides a way , as follows ：

WriteCellStyle.setHidden(true);

Set the cell as hidden

  however , This method does not work ！GitHub There is no corresponding source code on ... Friends who can directly use this method to achieve the effect are troublesome d once

2、 Realize the principle of line hiding

easyExcel The bottom is POI, therefore ,easyExcel Set hidden style , It's also inseparable from POI Of , In the view POI Source code , Find out , Set behavior hide style , In fact, set the row height to 0, We are Excel You can also know , Hide rows , In fact, line height is for 0, as follows ：

【 The first 8 Rows are set to hidden , Line height for 0】

  Implementation principle ： Put the lines that need to be hidden , Row height set to 0 that will do

3、 The code is as follows

easyExcel You can use the following code , Set row height for header and content respectively ：

//  Set the row height of the data table     Parameters 1 Indicates the height of the header row , Parameters 2 Indicates the content line height 
SimpleRowHeightStyleStrategy rowHeightStrategy3 = new SimpleRowHeightStyleStrategy((short)20, (short) 18);

however , In development , This object does not meet our needs

for example ： When you need to set the last behavior to hide , This class cannot achieve this effect

If a column is set as hidden style , You can add custom tool classes , as follows ：

3.1、 Custom line style tool class code

package com.shuizhu.util;

import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;

import com.alibaba.excel.write.style.row.AbstractRowHeightStyleStrategy;

/**
 * excel Table row height setting and style 
 *
 * @author  Sleeping bamboo 
 */
public class CustomRowHeightStyleStrategy extends AbstractRowHeightStyleStrategy {

    /**
     *  Set the line number to be hidden 
     */
    Integer rowNum;

    public CustomRowHeightStyleStrategy(int rowNum){
        this.rowNum = rowNum;
    }

    /**
     *  Set the row height of the header 
     */
    @Override
    protected void setHeadColumnHeight(Row row, int relativeRowIndex) {
        // Set the header row height to 18
        row.setHeightInPoints(18);
    }

    /**
     *  Set the line height of the content  relativeRowIndex Is the number of rows , Index from 0 Start 
     */
    @Override
    protected void setContentColumnHeight(Row row, int relativeRowIndex) {
        if (relativeRowIndex + 1 == rowNum) {
            // Set row hiding 
            row.setHeightInPoints((0));
        }
    }
}

explain ：

There are 2 A key point ：

1. rowNum： Line number , Which row needs to be hidden , We can just pass the serial number of the line , for example , Our tabular data total 5 That's ok 【 The total number of rows can be passed Java Code acquisition 】, You need to put the number 5 Line hiding , We deliver 5 That's all right.
2. relativeRowIndex： Line number , protected void setContentColumnHeight Method will execute N Time 【N = Total rows of table data 】

When building tables , Just pass the corresponding number of lines ：

I hid the first 5 That's ok , Let's see the effect ：

 

Section of the form 5 Line hidden ！