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com.jeesuite.common2.excel.ExcelWriter Maven / Gradle / Ivy
package com.jeesuite.common2.excel;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.util.List;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.jeesuite.common2.excel.helper.ExcelBeanHelper;
import com.jeesuite.common2.excel.model.ExcelMeta;
import com.jeesuite.common2.excel.model.TitleMeta;
public final class ExcelWriter implements Closeable {
private static final Logger LOG = LoggerFactory.getLogger(ExcelWriter.class);
private String sheetName;
private OutputStream outputStream;
private final SXSSFWorkbook workbook;
/**
* 构造方法，传入需要操作的excel文件路径
*
* @param excelFilePath 需要操作的excel文件的路径
* @throws IOException IO流异常
* @throws InvalidFormatException 非法的格式异常
*/
public ExcelWriter(String excelFilePath,String sheetName) throws IOException, InvalidFormatException {
this.sheetName = sheetName;
File file = new File(excelFilePath);
boolean exists = file.exists();
if(!exists)file.createNewFile();
outputStream = new FileOutputStream(file);
this.workbook = createWorkbook(exists ? file : null);
}
public ExcelWriter(String excelFilePath) throws IOException, InvalidFormatException {
this(excelFilePath,"Sheet1");
}
public ExcelWriter(OutputStream outputStream) throws IOException, InvalidFormatException {
this(outputStream,"Sheet1");
}
public ExcelWriter(OutputStream outputStream, String sheetName) throws InvalidFormatException, IOException {
super();
this.outputStream = outputStream;
this.sheetName = sheetName;
this.workbook = createWorkbook(null);
}
/**
* 设置需要读取的sheet名字，不设置默认的名字是Sheet1，也就是excel默认给的名字，所以如果文件没有自已修改，这个方法也就不用调了
*
* @param sheetName 需要读取的Sheet名字
*/
public void setSheetName(String sheetName) {
this.sheetName = sheetName;
}
private SXSSFWorkbook createWorkbook(File existFile) throws IOException, InvalidFormatException {
SXSSFWorkbook workbook;
if (existFile == null) {
workbook = new SXSSFWorkbook(1000);//内存中保留 1000条数据，以免内存溢出
} else {
workbook = new SXSSFWorkbook(new XSSFWorkbook(existFile), 1000);
}
return workbook;
}
/**
* 将数据写入excel文件
*
* @param list 数据列表
* @param 泛型
* @return 写入结果
*/
public boolean write(List list, Class clazz) {
ExcelMeta excelMeta = ExcelBeanHelper.getExcelMeta(clazz);
try {
Sheet sheet = workbook.createSheet(this.sheetName);
sheet.setDefaultColumnWidth(15);
CellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(HorizontalAlignment.CENTER);
titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);
titleStyle.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.getIndex());
titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
titleStyle.setBorderBottom(BorderStyle.THIN); //下边框
titleStyle.setBorderLeft(BorderStyle.THIN);
Font font = workbook.createFont();
font.setFontName("宋体");
font.setFontHeightInPoints((short) 13);
titleStyle.setFont(font);
//列值类型
Class[] cellValueTypes = new Class[excelMeta.getTitleColumnNum()];
//写标题
for (int i = 1; i <= excelMeta.getTitleRowNum(); i++) {
Row excelRow = sheet.createRow(i - 1);
for (int j = 1; j <= excelMeta.getTitleColumnNum(); j++) {
TitleMeta titleMeta = excelMeta.getTitleMeta(i, j);
Cell cell = excelRow.createCell(j - 1);
cell.setCellValue(titleMeta == null ? "" : titleMeta.getTitle());
cell.setCellStyle(titleStyle);
cellValueTypes[j-1] = titleMeta.getValueType();
}
}
//合并表头
//sheet.addMergedRegion(new CellRangeAddress(0, 0, 3, 8));
//sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 0));
mergeColumns(sheet,titleStyle);
mergeRows(sheet,titleStyle,excelMeta);
// 行数
int rowsCount = sheet.getPhysicalNumberOfRows();
//冻结表头
//sheet.createFreezePane(0, rowsCount - 1);
// 写入内容
List rows = ExcelBeanHelper.beanToExcelValueArrays(list, clazz);
// 列数
//int colsCount = sheet.getRow(0).getPhysicalNumberOfCells();
for (int i = 0; i < rows.size(); i++) {
Row excelRow = sheet.createRow(i + rowsCount);
Object[] vals = rows.get(i);
for (int j = 0; j < vals.length; j++) {
Cell cell = excelRow.createCell(j);
if(cellValueTypes[j] == int.class || cellValueTypes[j] == Integer.class){
cell.setCellValue(vals[j] == null ? 0f : Integer.parseInt(vals[j].toString()));
}else if(cellValueTypes[j] == float.class || cellValueTypes[j] == Float.class
|| cellValueTypes[j] == double.class || cellValueTypes[j] == Double.class
|| cellValueTypes[j] == BigDecimal.class){
cell.setCellValue(vals[j] == null ? 0d : Double.parseDouble(vals[j].toString()));
}else{
cell.setCellValue(vals[j] == null ? "" : vals[j].toString());
}
}
}
workbook.write(outputStream);
return true;
} catch (IOException e) {
LOG.error("流异常", e);
} catch (Exception e) {
LOG.error("其他异常", e);
} finally {
}
return false;
}
/**
* 合并列
*/
private void mergeColumns(Sheet sheet,CellStyle cellStyle) {
// 行数
int rowsCount = sheet.getPhysicalNumberOfRows();
// 列数
int colsCount = sheet.getRow(0).getPhysicalNumberOfCells();
Row row = null;
Cell cell1 = null;
Cell cell2 = null;
int colSpan = 0;
for (int r = 0; r < rowsCount; r++) {
row = sheet.getRow(r);
// 重置
colSpan = 0;
row = sheet.getRow(r);
for (int c = 0; c < colsCount; c++) {
cell1 = row.getCell(c);
cell2 = row.getCell(c + 1);
if (cell1 == null) {// 如果当前单元格是空的，跳过，继续当前行的后一个单元格查找
if (c == colsCount - 1) {
break;
} else {
continue;
}
}
if (cell2 == null) {// 说明当前行已经到最后一个单元格了
if (colSpan >= 1) {// 判断colSpan是否大于等于1，大于1就要合并了
// 合并行中连续相同的值的单元格
sheet.addMergedRegion(new CellRangeAddress(r, r, c - colSpan, c));
break;
}
}
if (cell1 != null && cell2 != null) {
// 如果当前单元格和下一个单元格内容相同，那么colSpan加1
if (cell1.getStringCellValue().equals(cell2.getStringCellValue())) {
colSpan++;
} else {
// 如果当前单元格和下一个不等，那么判断colSpan是否大于等于1
if (colSpan >= 1) {
// 合并行中连续相同的值的单元格
sheet.addMergedRegion(new CellRangeAddress(r, r, c - colSpan, c));
Cell nowCell = sheet.getRow(r).getCell(c - colSpan);
nowCell.setCellStyle(cellStyle);
// 合并后重置colSpan
colSpan = 0;
continue;
}
}
}
}
}
}
/**
* 合并行
*/
//TODO 暂时支持两行表头
private void mergeRows(Sheet sheet,CellStyle cellStyle,ExcelMeta excelMeta) {
Row row = null;
Cell cell = null;
String[] lastRowVals = new String[excelMeta.getTitleColumnNum()];
for (int r = 0; r < excelMeta.getTitleRowNum(); r++) {
for (int c = 0; c < excelMeta.getTitleColumnNum(); c++) {
row = sheet.getRow(r);
cell = row.getCell(c);
if(r == 0){
lastRowVals[c] = cell.getStringCellValue();
}else{
if(StringUtils.equals(lastRowVals[c],cell.getStringCellValue())){
cell.setCellValue("");
sheet.addMergedRegion(new CellRangeAddress(0, r, c, c));
Cell nowCell = sheet.getRow(0).getCell(c);
nowCell.setCellStyle(cellStyle);
}
}
}
}
}
@Override
public void close() throws IOException {
try {this.outputStream.close();} catch (Exception e) {}
try {this.workbook.close();} catch (Exception e) {}
}
}
