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使用apachepoi怎么实现导出excel文件
使用apache poi怎么实现导出excel文件？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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代码如下：
package com.icourt.util;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 描述:poi根据模板导出excel,根据excel坐标赋值,如(B1)
*/
public class ExcelExportUtil {
//模板map
private Map tempWorkbook = new HashMap();
//模板输入流map
private Map tempStream = new HashMap();
/**
* 功能:按模板向Excel中相应地方填充数据
*/
public void writeData(String templateFilePath, Map dataMap, int sheetNo) throws IOException, InvalidFormatException {
if (dataMap == null || dataMap.isEmpty()) {
return;
}
//读取模板
Workbook wbModule = getTempWorkbook(templateFilePath);
//数据填充的sheet
Sheet wsheet = wbModule.getSheetAt(sheetNo);
for (Entry entry : dataMap.entrySet()) {
String point = entry.getKey();
Object data = entry.getValue();
TempCell cell = getCell(point, data, wsheet);
//指定坐标赋值
setCell(cell, wsheet);
}
//设置生成excel中公式自动计算
wsheet.setForceFormulaRecalculation(true);
}
/**
* 功能:按模板向Excel中列表填充数据.只支持列合并
*/
public void writeDateList(String templateFilePath, String[] heads, List> datalist, int sheetNo) throws IOException, InvalidFormatException {
if (heads == null || heads.length <= 0 || CollectionUtils.isEmpty(datalist)) {
return;
}
//读取模板
Workbook wbModule = getTempWorkbook(templateFilePath);
//数据填充的sheet
Sheet wsheet = wbModule.getSheetAt(sheetNo);
//列表数据模板cell
List tempCells = new ArrayList(heads.length);
for (String point : heads) {
TempCell tempCell = getCell(point, null, wsheet);
//取得合并单元格位置 -1:表示不是合并单元格
int pos = isMergedRegion(wsheet, tempCell.getRow(), tempCell.getColumn());
if (pos > -1) {
CellRangeAddress range = wsheet.getMergedRegion(pos);
tempCell.setColumnSize(range.getLastColumn() - range.getFirstColumn());
}
tempCells.add(tempCell);
}
//赋值
for (int i = 0; i < datalist.size(); i++) {//数据行
Map dataMap = datalist.get(i);
for (int j = 0; j < tempCells.size(); j++) {//列
TempCell tempCell = tempCells.get(j);
tempCell.setData(dataMap.get(j + 1));
setCell(tempCell, wsheet);
tempCell.setRow(tempCell.getRow() + 1);
}
}
}
/**
* 功能:获取输入工作区
*/
private Workbook getTempWorkbook(String templateFilePath) throws IOException, InvalidFormatException {
if (!tempWorkbook.containsKey(templateFilePath)) {
InputStream inputStream = getInputStream(templateFilePath);
tempWorkbook.put(templateFilePath, WorkbookFactory.create(inputStream));
}
return tempWorkbook.get(templateFilePath);
}
/**
* 功能:获得模板输入流
*/
private InputStream getInputStream(String templateFilePath) throws FileNotFoundException {
if (!tempStream.containsKey(templateFilePath)) {
tempStream.put(templateFilePath, new FileInputStream((templateFilePath)));
}
return tempStream.get(templateFilePath);
}
/**
* 功能:获取单元格数据,样式(根据坐标:B3)
*/
private TempCell getCell(String point, Object data, Sheet sheet) {
TempCell tempCell = new TempCell();
//得到列 字母
String lineStr = "";
String reg = "[A-Z]+";
Pattern p = Pattern.compile(reg);
Matcher m = p.matcher(point);
while (m.find()) {
lineStr = m.group();
}
//将列字母转成列号 根据ascii转换
char[] ch = lineStr.toCharArray();
int column = 0;
for (int i = 0; i < ch.length; i++) {
char c = ch[i];
int post = ch.length - i - 1;
int r = (int) Math.pow(10, post);
column = column + r * ((int) c - 65);
}
tempCell.setColumn(column);
//得到行号
reg = "[1-9]+";
p = Pattern.compile(reg);
m = p.matcher(point);
while (m.find()) {
tempCell.setRow((Integer.parseInt(m.group()) - 1));
}
//获取模板指定单元格样式,设置到tempCell(写列表数据的时候用)
Row rowIn = sheet.getRow(tempCell.getRow());
if (rowIn == null) {
rowIn = sheet.createRow(tempCell.getRow());
}
Cell cellIn = rowIn.getCell(tempCell.getColumn());
if (cellIn == null) {
cellIn = rowIn.createCell(tempCell.getColumn());
}
tempCell.setCellStyle(cellIn.getCellStyle());
tempCell.setData(data);
return tempCell;
}
/**
* 功能:给指定坐标单元格赋值
*/
private void setCell(TempCell tempCell, Sheet sheet) {
if (tempCell.getColumnSize() > -1) {
CellRangeAddress rangeAddress = mergeRegion(sheet, tempCell.getRow(), tempCell.getRow(), tempCell.getColumn(), tempCell.getColumn() + tempCell.getColumnSize());
setRegionStyle(tempCell.getCellStyle(), rangeAddress, sheet);
}
Row rowIn = sheet.getRow(tempCell.getRow());
if (rowIn == null) {
copyRows(tempCell.getRow() - 1, tempCell.getRow() - 1, tempCell.getRow(), sheet);//复制上一行
rowIn = sheet.getRow(tempCell.getRow());
}
Cell cellIn = rowIn.getCell(tempCell.getColumn());
if (cellIn == null) {
cellIn = rowIn.createCell(tempCell.getColumn());
}
//根据data类型给cell赋值
if (tempCell.getData() instanceof String) {
cellIn.setCellValue((String) tempCell.getData());
} else if (tempCell.getData() instanceof Integer) {
cellIn.setCellValue((int) tempCell.getData());
} else if (tempCell.getData() instanceof Double) {
cellIn.setCellValue((double) tempCell.getData());
} else {
cellIn.setCellValue((String) tempCell.getData());
}
//样式
if (tempCell.getCellStyle() != null && tempCell.getColumnSize() == -1) {
cellIn.setCellStyle(tempCell.getCellStyle());
}
}
/**
* 功能:写到输出流并移除资源
*/
public void writeAndClose(String templateFilePath, OutputStream os) throws IOException, InvalidFormatException {
if (getTempWorkbook(templateFilePath) != null) {
getTempWorkbook(templateFilePath).write(os);
tempWorkbook.remove(templateFilePath);
}
if (getInputStream(templateFilePath) != null) {
getInputStream(templateFilePath).close();
tempStream.remove(templateFilePath);
}
}
/**
* 功能:判断指定的单元格是否是合并单元格
*/
private Integer isMergedRegion(Sheet sheet, int row, int column) {
for (int i = 0; i < sheet.getNumMergedRegions(); i++) {
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
return i;
}
}
}
return -1;
}
/**
* 功能:合并单元格
*/
private CellRangeAddress mergeRegion(Sheet sheet, int firstRow, int lastRow, int firstCol, int lastCol) {
CellRangeAddress rang = new CellRangeAddress(firstRow, lastRow, firstCol, lastCol);
sheet.addMergedRegion(rang);
return rang;
}
/**
* 功能:设置合并单元格样式
*/
private void setRegionStyle(CellStyle cs, CellRangeAddress region, Sheet sheet) {
for (int i = region.getFirstRow(); i <= region.getLastRow(); i++) {
Row row = sheet.getRow(i);
if (row == null) row = sheet.createRow(i);
for (int j = region.getFirstColumn(); j <= region.getLastColumn(); j++) {
Cell cell = row.getCell(j);
if (cell == null) {
cell = row.createCell(j);
cell.setCellValue("");
}
cell.setCellStyle(cs);
}
}
}
/**
* 功能:copy rows
*/
private void copyRows(int startRow, int endRow, int pPosition, Sheet sheet) {
int pStartRow = startRow - 1;
int pEndRow = endRow - 1;
int targetRowFrom;
int targetRowTo;
int columnCount;
CellRangeAddress region = null;
int i;
int j;
if (pStartRow == -1 || pEndRow == -1) {
return;
}
// 拷贝合并的单元格
for (i = 0; i < sheet.getNumMergedRegions(); i++) {
region = sheet.getMergedRegion(i);
if ((region.getFirstRow() >= pStartRow)
&& (region.getLastRow() <= pEndRow)) {
targetRowFrom = region.getFirstRow() - pStartRow + pPosition;
targetRowTo = region.getLastRow() - pStartRow + pPosition;
CellRangeAddress newRegion = region.copy();
newRegion.setFirstRow(targetRowFrom);
newRegion.setFirstColumn(region.getFirstColumn());
newRegion.setLastRow(targetRowTo);
newRegion.setLastColumn(region.getLastColumn());
sheet.addMergedRegion(newRegion);
}
}
// 设置列宽
for (i = pStartRow; i <= pEndRow; i++) {
Row sourceRow = sheet.getRow(i);
columnCount = sourceRow.getLastCellNum();
if (sourceRow != null) {
Row newRow = sheet.createRow(pPosition - pStartRow + i);
newRow.setHeight(sourceRow.getHeight());
for (j = 0; j < columnCount; j++) {
Cell templateCell = sourceRow.getCell(j);
if (templateCell != null) {
Cell newCell = newRow.createCell(j);
copyCell(templateCell, newCell);
}
}
}
}
}
/**
* 功能:copy cell,不copy值
*/
private void copyCell(Cell srcCell, Cell distCell) {
distCell.setCellStyle(srcCell.getCellStyle());
if (srcCell.getCellComment() != null) {
distCell.setCellComment(srcCell.getCellComment());
}
int srcCellType = srcCell.getCellType();
distCell.setCellType(srcCellType);
}
/**
* 描述:临时单元格数据
*/
class TempCell {
private int row;
private int column;
private CellStyle cellStyle;
private Object data;
//用于列表合并,表示几列合并
private int columnSize = -1;
public int getColumn() {
return column;
}
public void setColumn(int column) {
this.column = column;
}
public int getRow() {
return row;
}
public void setRow(int row) {
this.row = row;
}
public CellStyle getCellStyle() {
return cellStyle;
}
public void setCellStyle(CellStyle cellStyle) {
this.cellStyle = cellStyle;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
public int getColumnSize() {
return columnSize;
}
public void setColumnSize(int columnSize) {
this.columnSize = columnSize;
}
}
public static void main(String[] args) throws FileNotFoundException, IOException, InvalidFormatException {
String templateFilePath = ExcelExportUtil.class.getClassLoader().getResource("plugin/ProTiming.xlsx").getPath();
File file = new File("/Users/sql/Downloads/test/data.xlsx");
OutputStream os = new FileOutputStream(file);
ExcelExportUtil excel = new ExcelExportUtil();
Map dataMap = new HashMap();
dataMap.put("B1", "03_Alpha_项目工作时间统计表");
dataMap.put("B2", "统计时间：2017/01/01 - 2017/03/31");
excel.writeData(templateFilePath, dataMap, 0);
List> datalist = new ArrayList>();
Map data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "3/10/17");
data.put(2, "18:50");
data.put(3, "19:00");
data.put(4, "李子鹏");
data.put(5, "新增项目键值对接口,供任务计时调用新增项目键值对接口,供任务计时调用新增项目键值对接口,供任务计时调用新增项目键值对接口,供任务计时调用新增项目键值对接口,供任务计时调用新增项目键值对接口,供任务计时调用新增项目键值对接口,供任务计时调用新增项目键值对接口,供任务计时调用");
data.put(6, "代码开发");
data.put(7, "3.17");
datalist.add(data);
data = new HashMap();
data.put(1, "");
data.put(2, "");
data.put(3, "");
data.put(4, "");
data.put(5, "");
data.put(6, "");
data.put(7, "");
datalist.add(data);
String[] heads = new String[]{"B4", "C4", "D4", "E4", "F4", "G4", "H4"};
excel.writeDateList(templateFilePath, heads, datalist, 0);
//写到输出流并移除资源
excel.writeAndClose(templateFilePath, os);
os.flush();
os.close();
}
} 大体思路：
最主要是制作好模版
代码根据模版，读取设置好的列的格式，在循环数据行，读取模版中的对应的行，存在该行就取得，不存在看是否需要copy某一行，不需要就手动创建无制定格式的行，后面在为该行的每一列对应的给个单元格制定格式和数据。
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