一、最初版本
导出的结果：
对应实体类代码：
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.alibaba.excel.annotation.write.style.ContentLoopMerge;
import com.alibaba.excel.annotation.write.style.ContentRowHeight;
import com.alibaba.excel.annotation.write.style.HeadRowHeight;
import lombok.*;
import java.io.Serializable;
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Data
@ContentRowHeight(30)
@HeadRowHeight(40)
@ColumnWidth(25)
public class StudentExportVo implements Serializable {
private static final long serialVersionUID = -5809782578272943999L;
@ExcelProperty(value = "学校", order = 1)
@ContentLoopMerge(eachRow = 3)
private String school;
@ExcelProperty(value = "姓名", order = 2)
private String name;
@ExcelProperty(value = "性别", order = 3)
private String sex;
@ExcelProperty(value = "年龄", order = 4)
private String age;
@ExcelProperty(value = "城市", order = 5)
private String city;
@ExcelProperty(value = "备注", order = 6)
private String remarks;
}
对应业务代码：
@ApiOperation(value = "导出学生信息", notes = "导出学生信息")
@PostMapping("/exportStudent")
public void exportStudent(@RequestBody String str, HttpServletResponse response) {
List<StudentExportVo> list = this.getStudentExportVos();
ExcelUtils.writeExcel(response, StudentExportVo.class, list, "导出学生信息", "sheet1");
}
//数据制造
private List<StudentExportVo> getStudentExportVos() {
List<StudentExportVo> list = new ArrayList<>();
StudentExportVo v1 = new StudentExportVo();
v1.setSchool("北京大学");
v1.setName("张三");
v1.setSex("男");
v1.setAge("20");
v1.setCity("北京");
v1.setRemarks("无");
list.add(v1);
StudentExportVo v2 = new StudentExportVo();
v2.setSchool("北京大学");
v2.setName("李四");
v2.setSex("男");
v2.setAge("22");
v2.setCity("上海");
v2.setRemarks("无");
list.add(v2);
StudentExportVo v3 = new StudentExportVo();
v3.setSchool("北京大学");
v3.setName("王五");
v3.setSex("女");
v3.setAge("22");
v3.setCity("青岛");
v3.setRemarks("无");
list.add(v3);
StudentExportVo v4 = new StudentExportVo();
v4.setSchool("清华大学");
v4.setName("赵六");
v4.setSex("女");
v4.setAge("21");
v4.setCity("重庆");
v4.setRemarks("无");
list.add(v4);
StudentExportVo v5 = new StudentExportVo();
v5.setSchool("武汉大学");
v5.setName("王强");
v5.setSex("男");
v5.setAge("24");
v5.setCity("长沙");
v5.setRemarks("无");
list.add(v5);
StudentExportVo v6 = new StudentExportVo();
v6.setSchool("武汉大学");
v6.setName("赵燕");
v6.setSex("女");
v6.setAge("21");
v6.setCity("深圳");
v6.setRemarks("无");
list.add(v6);
StudentExportVo v7 = new StudentExportVo();
v7.setSchool("厦门大学");
v7.setName("陆仟");
v7.setSex("女");
v7.setAge("21");
v7.setCity("广州");
v7.setRemarks("无");
list.add(v7);
return list;
}
二、使用注解的版本
导出的结果：
对应实体类代码：
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Data
@ContentRowHeight(30)
@HeadRowHeight(40)
@ColumnWidth(25)
public class StudentExportVo implements Serializable {
private static final long serialVersionUID = -5809782578272943999L;
@ExcelProperty(value = {"学生信息","学校"}, order = 1)
@ContentLoopMerge(eachRow = 3)
private String school;
@ExcelProperty(value = {"学生信息","姓名"}, order = 2)
private String name;
@ExcelProperty(value = {"学生信息","性别"}, order = 3)
private String sex;
@ExcelProperty(value = {"学生信息","年龄"}, order = 4)
private String age;
@ExcelProperty(value = {"学生信息","城市"}, order = 5)
private String city;
@ExcelProperty(value = {"学生信息","备注"}, order = 6)
private String remarks;
}
对应业务代码：同上
@ContentLoopMerge(eachRow = 3) 可以合并单元格，但是他是按指定行数合并，并不能实现内容相同的合并
@ExcelProperty(value = {“学生信息”,“备注”}，能实现多个标题，但标题是固定的，不是动态的
三、自定义改造
导出的结果：
对应实体类代码：
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Data
@ContentRowHeight(30)
@HeadRowHeight(40)
@ColumnWidth(25)
public class StudentExportVo implements Serializable {
private static final long serialVersionUID = -5809782578272943999L;
@ExcelProperty(value = {"学生信息","学校"}, order = 1)
//@ContentLoopMerge(eachRow = 3)
private String school;
@ExcelProperty(value = {"学生信息","姓名"}, order = 2)
private String name;
@ExcelProperty(value = {"学生信息","性别"}, order = 3)
private String sex;
@ExcelProperty(value = {"学生信息","年龄"}, order = 4)
private String age;
@ExcelProperty(value = {"学生信息","城市"}, order = 5)
private String city;
@ExcelProperty(value = {"学生信息","备注"}, order = 6)
private String remarks;
}
对应业务代码：
@ApiOperation(value = "导出学生信息", notes = "导出学生信息")
@PostMapping("/exportStudent")
public void exportStudent(@RequestBody String dynamicTitle, HttpServletResponse response) {
List<StudentExportVo> list = this.getStudentExportVos();
try {
String fileName = "学生信息";
fileName = URLEncoder.encode(fileName, "UTF-8");
response.setContentType("application/json;charset=utf-8");
response.setCharacterEncoding("utf-8");
response.addHeader("Pargam", "no-cache");
response.addHeader("Cache-Control", "no-cache");
response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");
ServletOutputStream output = response.getOutputStream();
//需要合并的列
int[] mergeColumeIndex = {0};
// 从第二行后开始合并
int mergeRowIndex = 2;
//设置动态标题
List<List<String>> headers = this.getHeaders("学生信息" + dynamicTitle);
// 头的策略
WriteCellStyle headWriteCellStyle = new WriteCellStyle();
// 背景设置为白色
headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
/*WriteFont headWriteFont = new WriteFont();
headWriteFont.setFontHeightInPoints((short)20);
headWriteCellStyle.setWriteFont(headWriteFont);*/
// 内容的策略
WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定
//contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 背景绿色
//contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
//设置 自动换行
contentWriteCellStyle.setWrapped(true);
//设置 垂直居中
contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
//设置 水平居中
contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
/*WriteFont contentWriteFont = new WriteFont();
// 字体大小
contentWriteFont.setFontHeightInPoints((short)20);
contentWriteCellStyle.setWriteFont(contentWriteFont);*/
// 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
HorizontalCellStyleStrategy horizontalCellStyleStrategy =
new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
EasyExcel.write(output, StudentExportVo.class)
.sheet("学生信息")
.head(headers)
.registerWriteHandler(new ExcelMergeHandler(mergeRowIndex, mergeColumeIndex))
.registerWriteHandler(horizontalCellStyleStrategy)
// .registerWriteHandler(new SimpleColumnWidthStyleStrategy(30))
.registerWriteHandler(new AbstractColumnWidthStyleStrategy() {
@Override
protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<CellData> list, Cell cell, Head head, Integer integer, Boolean aBoolean) {
Sheet sheet = writeSheetHolder.getSheet();
int columnIndex = cell.getColumnIndex();
if(columnIndex == 5){
// 列宽100
sheet.setColumnWidth(columnIndex, 10000);
}else {
// 列宽50
sheet.setColumnWidth(columnIndex, 5000);
}
// 行高40
sheet.setDefaultRowHeight((short) 4000);
}
})
.doWrite(list);
output.flush();
} catch (IOException e) {
log.error(e.getMessage(), e);
}
}
private List<List<String>> getHeaders(String dynamicTitle) {
List<List<String>> headers=new ArrayList<>();
List<String> schoolHead=new ArrayList<>();
schoolHead.add(dynamicTitle);
schoolHead.add("学校");
List<String> nameHead=new ArrayList<>();
nameHead.add(dynamicTitle);
nameHead.add("姓名");
List<String> sexHead=new ArrayList<>();
sexHead.add(dynamicTitle);
sexHead.add("性别");
List<String> ageHead=new ArrayList<>();
ageHead.add(dynamicTitle);
ageHead.add("年龄");
List<String> cityHead=new ArrayList<>();
cityHead.add(dynamicTitle);
cityHead.add("城市");
List<String> remarksHead=new ArrayList<>();
remarksHead.add(dynamicTitle);
remarksHead.add("备注");
headers.add(schoolHead);
headers.add(nameHead);
headers.add(sexHead);
headers.add(ageHead);
headers.add(cityHead);
headers.add(remarksHead);
return headers;
}
//数据制造
private List<StudentExportVo> getStudentExportVos() {
List<StudentExportVo> list = new ArrayList<>();
StudentExportVo v1 = new StudentExportVo();
v1.setSchool("北京大学");
v1.setName("张三");
v1.setSex("男");
v1.setAge("20");
v1.setCity("北京");
v1.setRemarks("无");
list.add(v1);
StudentExportVo v2 = new StudentExportVo();
v2.setSchool("北京大学");
v2.setName("李四");
v2.setSex("男");
v2.setAge("22");
v2.setCity("上海");
v2.setRemarks("无");
list.add(v2);
StudentExportVo v3 = new StudentExportVo();
v3.setSchool("北京大学");
v3.setName("王五");
v3.setSex("女");
v3.setAge("22");
v3.setCity("青岛");
v3.setRemarks("无");
list.add(v3);
StudentExportVo v4 = new StudentExportVo();
v4.setSchool("清华大学");
v4.setName("赵六");
v4.setSex("女");
v4.setAge("21");
v4.setCity("重庆");
v4.setRemarks("无");
list.add(v4);
StudentExportVo v5 = new StudentExportVo();
v5.setSchool("武汉大学");
v5.setName("王强");
v5.setSex("男");
v5.setAge("24");
v5.setCity("长沙");
v5.setRemarks("无");
list.add(v5);
StudentExportVo v6 = new StudentExportVo();
v6.setSchool("武汉大学");
v6.setName("赵燕");
v6.setSex("女");
v6.setAge("21");
v6.setCity("深圳");
v6.setRemarks("无");
list.add(v6);
StudentExportVo v7 = new StudentExportVo();
v7.setSchool("厦门大学");
v7.setName("陆仟");
v7.setSex("女");
v7.setAge("21");
v7.setCity("广州");
v7.setRemarks("无");
list.add(v7);
return list;
}
合并单元格相同内容处理类：ExcelMergeHandler
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
import java.util.List;
public class ExcelMergeHandler implements CellWriteHandler {
private int[] mergeColumnIndex;
private int mergeRowIndex;
public ExcelMergeHandler() {
}
public ExcelMergeHandler(int mergeRowIndex, int[] mergeColumnIndex) {
this.mergeRowIndex = mergeRowIndex;
this.mergeColumnIndex = mergeColumnIndex;
}
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
}
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
}
@Override
public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
}
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
//当前行
int curRowIndex = cell.getRowIndex();
//当前列
int curColIndex = cell.getColumnIndex();
if (curRowIndex > mergeRowIndex) {
for (int i = 0; i < mergeColumnIndex.length; i++) {
if (curColIndex == mergeColumnIndex[i]) {
mergeWithPrevRow(writeSheetHolder, cell, curRowIndex, curColIndex);
break;
}
}
}
}
/**
* 当前单元格向上合并
*
* @param writeSheetHolder
* @param cell 当前单元格
* @param curRowIndex 当前行
* @param curColIndex 当前列
*/
private void mergeWithPrevRow(WriteSheetHolder writeSheetHolder, Cell cell, int curRowIndex, int curColIndex) {
Object curData = cell.getCellTypeEnum() == CellType.STRING ? cell.getStringCellValue() : cell.getNumericCellValue();
Cell preCell = cell.getSheet().getRow(curRowIndex - 1).getCell(curColIndex);
Object preData = preCell.getCellTypeEnum() == CellType.STRING ? preCell.getStringCellValue() : preCell.getNumericCellValue();
// 将当前单元格数据与上一个单元格数据比较
Boolean dataBool = preData.equals(curData);
//此处需要注意：因为我是按照工程名称确定是否需要合并的，所以获取每一行第二列数据和上一行第一列数据进行比较，如果相等合并，getCell里面的值，是工程名称所在列的下标
String s1 = cell.getRow().getCell(0).getStringCellValue();
String s2 = cell.getSheet().getRow(curRowIndex - 1).getCell(0).getStringCellValue();
/*BigDecimal d1 = new BigDecimal(cell.getRow().getCell(0).getNumericCellValue());
BigDecimal d2 = new BigDecimal(cell.getSheet().getRow(curRowIndex - 1).getCell(0).getNumericCellValue());*/
Boolean bool = s1.compareTo(s2) == 0 ? true:false;
// 原始的
// Boolean bool = cell.getRow().getCell(1).getStringCellValue().equals(cell.getSheet().getRow(curRowIndex - 1).getCell(1).getStringCellValue());
if (dataBool && bool) {
Sheet sheet = writeSheetHolder.getSheet();
List<CellRangeAddress> mergeRegions = sheet.getMergedRegions();
boolean isMerged = false;
for (int i = 0; i < mergeRegions.size() && !isMerged; i++) {
CellRangeAddress cellRangeAddr = mergeRegions.get(i);
// 若上一个单元格已经被合并，则先移出原有的合并单元，再重新添加合并单元
if (cellRangeAddr.isInRange(curRowIndex - 1, curColIndex)) {
sheet.removeMergedRegion(i);
cellRangeAddr.setLastRow(curRowIndex);
sheet.addMergedRegion(cellRangeAddr);
isMerged = true;
}
}
// 若上一个单元格未被合并，则新增合并单元
if (!isMerged) {
CellRangeAddress cellRangeAddress = new CellRangeAddress(curRowIndex - 1, curRowIndex, curColIndex, curColIndex);
sheet.addMergedRegion(cellRangeAddress);
}
}
}
}
总结：
1、使用自定义合并相同内容单元格时，实体类中的注解@ContentLoopMerge需要去掉，要不然会受到影响
2、该段自定义代码中如内容合并、设置动态标题、内容、以及每个列的宽度及字体都是可以根据自定义策略来进行设置的，具体用法可以参考代码注释说明，根据需要进行使用
