Two pits exported using easyexcel template (map empty data columns are disordered and nested objects are not supported)

In the project , Many colleagues like to use Map To store data , In particular, query data from the database and store it in List<Map<String,Object>> among . This will lead to the passage of excel The data is disordered when exporting the template .
At present easyexcel edition

 <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
     <version>3.1.1</version>
 </dependency>

Suppose the following template exists （limitManage2.xlsx）.

date	Operator	Start date of quota period	Due date of quota period	Total amount ( element )	Remaining amount ( element )	remarks	state	Name of organization	Collected limit ( element )	remarks 2
{bean.CREATE_DATE}	{bean.CREATOR}	{bean.LIMIT_CYCLE_START}	{bean.LIMIT_CYCLE_MTR}	{bean.TOTAL_LIMIT}	{bean.SURPLUS_LIMIT}	{bean.REMARK}	{bean.STATUS}	{bean.BRANCH_INSTITUTION_NAME}	{bean.GET_LIMIT}	{bean.fillData3.REMARK}

First, through List<Map<String,Object>> Fill in the data ( Willingly REMARK The value part of the field is set to null , The rule is that the index with even number in the list is empty )

   private static Map<String, Object> data2(){
    
        Map<String, Object> params = new HashMap<>();
        List<Map<String, String>> result = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
    
            Map<String, String> curMap = new HashMap<>();
            curMap.put("CREATE_DATE", "2018-06-12");
            curMap.put("STATUS", " In force ");
            curMap.put("LIMIT_CYCLE_START", "2018-06-12");
            curMap.put("LIMIT_CYCLE_MTR", "2018-06-12");
            curMap.put("BRANCH_INSTITUTION_NAME", " Asset management department ");
            curMap.put("SURPLUS_LIMIT", "88888888" + i);
            curMap.put("CREATOR", " System administrator " + i);
            curMap.put("GET_LIMIT", "101000000");
            curMap.put("PK", "2417");
            curMap.put("TOTAL_LIMIT", "88888888");
            if (i % 2 == 0) {
    
                curMap.put("REMARK", " Customized quota " + i);
            }else {
    
// curMap.put("REMARK","");
            }
            result.add(curMap);
        }
        params.put("bean", result);
        return params;
    }

Create test class

    @Test
    public void compositeFillMapIssue() {
    
        String templateFileName =
                TestFileUtil.getPath() + "demo" + File.separator + "fill" + File.separator + "limitManage2.xlsx";
        System.out.println(new File(templateFileName).getPath());
        String fileName = TestFileUtil.getPath() + "compositeFill" + System.currentTimeMillis() + ".xlsx";

        try (ExcelWriter excelWriter = EasyExcel.write(fileName).withTemplate(templateFileName).build()) {
    
            WriteSheet writeSheet = EasyExcel.writerSheet().build();
            Map<String, Object> data2 = data2();
            FillConfig fillConfig = FillConfig.builder().build();
            data2.forEach((key,value)->{
    
                excelWriter.fill(new FillWrapper(key, (List<Map<String, String>>)value),fillConfig, writeSheet);
            });
        }
        System.out.println(new File(fileName).getPath());
    }

Test classpath src/test/java/com/alibaba/easyexcel/test/demo/fill/FillTest.java
Test template path src/test/resources/demo/fill/limitManage2.xlsx

The results are shown below

Due date of quota period	Total amount ( element )	Remaining amount ( element )	remarks	state	Name of organization	Collected limit ( element )	remarks 2
2018-06-12	88888888	888888880	Customized quota 0	In force	Asset management department	101000000
2018-06-12	88888888	888888881	Customized quota 2	In force	Asset management department	101000000
2018-06-12	88888888	888888882	Customized quota 4	In force	Asset management department	101000000
2018-06-12	88888888	888888883	Customized quota 6	In force	Asset management department	101000000
2018-06-12	88888888	888888884	Customized quota 8	In force	Asset management department	101000000
2018-06-12	88888888	888888885	Customized quota 10	In force	Asset management department	101000000
2018-06-12	88888888	888888886	Customized quota 12	In force	Asset management department	101000000
2018-06-12	88888888	888888887	Customized quota 14	In force	Asset management department	101000000
2018-06-12	88888888	888888888	Customized quota 16	In force	Asset management department	101000000
2018-06-12	88888888	888888889	Customized quota 18	In force	Asset management department	101000000
2018-06-12	88888888	8888888810		In force	Asset management department	101000000
2018-06-12	88888888	8888888811		In force	Asset management department	101000000
2018-06-12	88888888	8888888812		In force	Asset management department	101000000
2018-06-12	88888888	8888888813		In force	Asset management department	101000000
2018-06-12	88888888	8888888814		In force	Asset management department	101000000
2018-06-12	88888888	8888888815		In force	Asset management department	101000000
2018-06-12	88888888	8888888816		In force	Asset management department	101000000
2018-06-12	88888888	8888888817		In force	Asset management department	101000000
2018-06-12	88888888	8888888818		In force	Asset management department	101000000
2018-06-12	88888888	8888888819		In force	Asset management department	101000000

From the above results, it is not difficult to see , The information in the remarks column is confused .

Found by test , take Map Turn it into an object .

pojo The definition is as follows

package com.alibaba.easyexcel.test.demo.fill;

import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
@EqualsAndHashCode
public class FillData2 {
    

    private String CREATE_DATE;
    private String STATUS;
    private String LIMIT_CYCLE_START;
    private String LIMIT_CYCLE_MTR;
    private String BRANCH_INSTITUTION_NAME;
    private String SURPLUS_LIMIT;
    private String CREATOR;
    private String GET_LIMIT;
    private String PK;
    private String TOTAL_LIMIT;
    private String REMARK;
    private FillData3 fillData3;
}

package com.alibaba.easyexcel.test.demo.fill;

import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.Setter;


@Getter
@Setter
@EqualsAndHashCode
public class FillData3 {
    

    private String REMARK3;

}

Create test data

  private static Map<String, List<FillData2>> data3(){
    
        Map<String, List<FillData2>> params = new HashMap<>();
        List<FillData2> result = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
    
            FillData2 curMap = new FillData2();

            curMap.setCREATE_DATE("2018-06-12");
            curMap.setSTATUS(" In force ");
            curMap.setLIMIT_CYCLE_START("2018-06-12");
            curMap.setLIMIT_CYCLE_MTR("2018-06-12");
            curMap.setBRANCH_INSTITUTION_NAME(" Asset management department ");
            curMap.setSURPLUS_LIMIT("88888888" + i);
            curMap.setCREATOR(" System administrator " + i);
            curMap.setGET_LIMIT("101000000");
            curMap.setPK("2417");
            curMap.setTOTAL_LIMIT("88888888");
            if (i % 2 == 0) {
    
                curMap.setREMARK(" Customized quota " + i);
            }else {
    
// curMap.put("REMARK","");
            }
            FillData3 fillData3 = new FillData3();
            fillData3.setREMARK3(curMap.getREMARK() +">>");
            curMap.setFillData3(fillData3);
            result.add(curMap);
        }
        params.put("bean", result);
        return params;
    }

Create test class

    @Test
    public void compositeFillMapIssue3() {
    
        String templateFileName =
                TestFileUtil.getPath() + "demo" + File.separator + "fill" + File.separator + "limitManage2.xlsx";
        System.out.println(new File(templateFileName).getPath());
        String fileName = TestFileUtil.getPath() + "compositeFill" + System.currentTimeMillis() + ".xlsx";

        //  programme 1
        try (ExcelWriter excelWriter = EasyExcel.write(fileName).withTemplate(templateFileName).build()) {
    
            WriteSheet writeSheet = EasyExcel.writerSheet().build();
            Map<String, List<FillData2>> data2 = data3();
            data2.forEach((key,value)->{
    
                excelWriter.fill(new FillWrapper(key, value), writeSheet);
            });
        }
        System.out.println(new File(fileName).getPath());
    }

The test results are shown below

Due date of quota period	Total amount ( element )	Remaining amount ( element )	remarks	state	Name of organization	Collected limit ( element )	remarks 2
2018-06-12	88888888	888888880	Customized quota 0	In force	Asset management department	101000000
2018-06-12	88888888	888888881		In force	Asset management department	101000000
2018-06-12	88888888	888888882	Customized quota 2	In force	Asset management department	101000000
2018-06-12	88888888	888888883		In force	Asset management department	101000000
2018-06-12	88888888	888888884	Customized quota 4	In force	Asset management department	101000000
2018-06-12	88888888	888888885		In force	Asset management department	101000000
2018-06-12	88888888	888888886	Customized quota 6	In force	Asset management department	101000000
2018-06-12	88888888	888888887		In force	Asset management department	101000000
2018-06-12	88888888	888888888	Customized quota 8	In force	Asset management department	101000000
2018-06-12	88888888	888888889		In force	Asset management department	101000000
2018-06-12	88888888	8888888810	Customized quota 10	In force	Asset management department	101000000
2018-06-12	88888888	8888888811		In force	Asset management department	101000000
2018-06-12	88888888	8888888812	Customized quota 12	In force	Asset management department	101000000
2018-06-12	88888888	8888888813		In force	Asset management department	101000000
2018-06-12	88888888	8888888814	Customized quota 14	In force	Asset management department	101000000
2018-06-12	88888888	8888888815		In force	Asset management department	101000000
2018-06-12	88888888	8888888816	Customized quota 16	In force	Asset management department	101000000
2018-06-12	88888888	8888888817		In force	Asset management department	101000000
2018-06-12	88888888	8888888818	Customized quota 18	In force	Asset management department	101000000
2018-06-12	88888888	8888888819		In force	Asset management department	101000000

As can be seen from the test results , The problem of disordered null data above has been solved , But there is no data in the last column . The corresponding template is {bean.fillData3.REMARK}, As you can see from here easyexcel Template export with complex object data in an object is not supported .