pom edition
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.7</version>
</dependency>1. Custom merge cells
In some business scenarios, there may be a need to merge cells , The following describes how to implement
1.1 Do not merge cells
Let's first look at the code for not merging cells , Simply review
public static void writeExcel() {
// Write excel The path of , Under the current project path
String fileName = getPath();
// structure ExcelWriter
ExcelWriter excelWriter = EasyExcel.write(fileName).excelType(ExcelTypeEnum.XLSX).build();
// structure sheet
WriteSheet writeSheet = EasyExcel.writerSheet(" Templates 1").head(DemoData.class).build();
// Write sheet
excelWriter.write(data1(), writeSheet);
excelWriter.finish();
}
private static String getPath() {
return System.getProperty("user.dir") + "/" + System.currentTimeMillis() + ".xlsx";
}
private static List<DemoData> data1() {
List<DemoData> list = Lists.newArrayList();
for (int i = 0; i < 3; i++) {
DemoData data = new DemoData();
data.setString(" character string " + 1);
data.setDate(new Date());
data.setDoubleData(0.56);
list.add(data);
}
for (int i = 0; i < 3; i++) {
DemoData data = new DemoData();
data.setString(" character string " + 2);
data.setDate(new Date());
data.setDoubleData(0.56);
list.add(data);
}
for (int i = 0; i < 4; i++) {
DemoData data = new DemoData();
data.setString(" character string " + 3);
data.setDate(new Date());
data.setDoubleData(0.57);
list.add(data);
}
return list;
}
public static void main(String[] args) {
writeExcel();
}Turn on the output of excel The following is the end of the document , You can see that the cells are not merged . Now I'm going to merge the first column with the same string title
1.2 merge cell
// Custom merge policy This class inherits AbstractMergeStrategy Abstract merge strategy , Need to rewrite merge() Method
public static class CustomMergeStrategy extends AbstractMergeStrategy {
/**
* grouping , Merge every few lines
*/
private List<Integer> exportFieldGroupCountList;
/**
* Target merge column index
*/
private Integer targetColumnIndex;
// You need to start merging the first row of cells index
private Integer rowIndex;
// exportDataList Is the value of the target column to be merged
public CustomMergeStrategy(List<String> exportDataList, Integer targetColumnIndex) {
this.exportFieldGroupCountList = getGroupCountList(exportDataList);
this.targetColumnIndex = targetColumnIndex;
}
@Override
protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
if (null == rowIndex) {
rowIndex = cell.getRowIndex();
}
// Merge only from the cells in the first row and the target column , Ignore the others
if (cell.getRowIndex() == rowIndex && cell.getColumnIndex() == targetColumnIndex) {
mergeGroupColumn(sheet);
}
}
private void mergeGroupColumn(Sheet sheet) {
int rowCount = rowIndex;
for (Integer count : exportFieldGroupCountList) {
if(count == 1) {
rowCount += count;
continue ;
}
// merge cell
CellRangeAddress cellRangeAddress = new CellRangeAddress(rowCount, rowCount + count - 1, targetColumnIndex, targetColumnIndex);
sheet.addMergedRegionUnsafe(cellRangeAddress);
rowCount += count;
}
}
// In this method, the target columns can be merged continuously according to whether the values are the same , Store the number of rows that can be merged
private List<Integer> getGroupCountList(List<String> exportDataList){
if (CollectionUtils.isEmpty(exportDataList)) {
return new ArrayList<>();
}
List<Integer> groupCountList = new ArrayList<>();
int count = 1;
for (int i = 1; i < exportDataList.size(); i++) {
if (exportDataList.get(i).equals(exportDataList.get(i - 1))) {
count++;
} else {
groupCountList.add(count);
count = 1;
}
}
// After processing the last item
groupCountList.add(count);
return groupCountList;
}
}
// modify WriteSheet The code for is as follows
public static void writeExcel() {
String fileName = getPath();
ExcelWriter excelWriter = EasyExcel.write(fileName).excelType(ExcelTypeEnum.XLSX).build();
List<DemoData> demoDataList = data1();
// Write sheet Register the corresponding custom merge cell policy
WriteSheet writeSheet = EasyExcel.writerSheet(" Templates 1").head(DemoData.class)
.registerWriteHandler(new CustomMergeStrategy(demoDataList.stream().map(DemoData::getString).collect(Collectors.toList()), 0))
.build();
excelWriter.write(demoDataList, writeSheet);
excelWriter.finish();
}Turn on the output of excel The following is the end of the document , You can see that the cells with the same value in the first column have been merged , Successful implementation
Similarly, if you want to merge the data in the third column , You can register a sheet Write processor , The code is as follows
public static void writeExcel() {
String fileName = getPath();
ExcelWriter excelWriter = EasyExcel.write(fileName).excelType(ExcelTypeEnum.XLSX).build();
List<DemoData> demoDataList = data1();
WriteSheet writeSheet = EasyExcel.writerSheet(" Templates 1").head(DemoData.class)
.registerWriteHandler(new CustomMergeStrategy(demoDataList.stream().map(DemoData::getString).collect(Collectors.toList()), 0))
.registerWriteHandler(new CustomMergeStrategy(demoDataList.stream().map(o -> o.getDoubleData().toString()).collect(Collectors.toList()), 2))
.build();
excelWriter.write(demoDataList, writeSheet);
excelWriter.finish();
}excel Open as follows ：
1.3 Write more than one sheet
public static void writeExcel() {
String fileName = getPath();
ExcelWriter excelWriter = EasyExcel.write(fileName).excelType(ExcelTypeEnum.XLSX).build();
List<DemoData> demoDataList = data1();
WriteSheet writeSheet = EasyExcel.writerSheet(" Templates 1").head(DemoData.class)
.registerWriteHandler(new CustomMergeStrategy(demoDataList.stream().map(DemoData::getString).collect(Collectors.toList()), 0))
.registerWriteHandler(new CustomMergeStrategy(demoDataList.stream().map(o -> o.getDoubleData().toString()).collect(Collectors.toList()), 2))
.build();
excelWriter.write(demoDataList, writeSheet);
WriteSheet writeSheet1 = EasyExcel.writerSheet(" Templates 2").head(DemoData.class).build();
excelWriter.write(data1(), writeSheet1);
excelWriter.finish();
}Output excel You can see that there are already two sheet 了
1.4 WriteTable
If the business requirements are in the same sheet Write multiple tables in , It needs to be used WriteTable 了 . Define only one WriteSheet, A few tables define just a few WriteTable
public static void writeExcel01() {
String fileName = getPath();
ExcelWriter excelWriter = EasyExcel.write(fileName).excelType(ExcelTypeEnum.XLSX).build();
WriteSheet writeSheet = EasyExcel.writerSheet(" Templates ").needHead(Boolean.FALSE).build();
List<DemoData> demoDataList = data1();
// The header should be set to true,WriteTable Some attributes are inherited from WriteSheet
WriteTable writeTable = EasyExcel.writerTable(1).head(DemoData.class).needHead(Boolean.TRUE)
.registerWriteHandler(new CustomMergeStrategy(demoDataList.stream().map(DemoData::getString).collect(Collectors.toList()), 0))
.registerWriteHandler(new CustomMergeStrategy(demoDataList.stream().map(o -> o.getDoubleData().toString()).collect(Collectors.toList()), 2))
.build();
excelWriter.write(demoDataList, writeSheet, writeTable);
WriteTable writeTable1 = EasyExcel.writerTable(2).head(DemoData.class).needHead(Boolean.TRUE).build();
excelWriter.write(data1(), writeSheet, writeTable1);
excelWriter.finish();
}open excel Form the following
Conclusion
If there are errors or optimization points, please point them out , This article references from EasyExcel file
EasyExcel- More about merging cells
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