poi导出excel

最近一直想写一个导出，去网上看了一下，大部分是采用HSSF的方式来导出的，所以自己想写一个基于XSSF来做的导出，去官网上看了些例子，做出来了一个小demo，用于记录自己的成果。

项目采用的maven来管理的，当然首先得引入关于POI的jar包。

<poi.version>3.14</poi.version>
<poi-ooxml.version>3.14</poi-ooxml.version>

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${poi-ooxml.version}</version>
</dependency>

下面开始我们正式的编码了。

package cn.sampson.utils;

import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.PrintSetup;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.util.Map;
import java.util.HashMap;
import java.util.List;

/**
* Created with IntelliJ IDEA
* ProjectName: util
* CreateTime : 2016/5/17 15:14
* Class Description:
* To change this template use File | Settings | File Template
*/
public class ExcelUtils {
private static Logger logger = LoggerFactory.getLogger(ExcelUtils.class);
public static final String xls = ".xlsx";

/**
* 采用XSSF方式导出excel（2007以上的版本采用此种方式）
*
* @param sheetName
* @param titles
* @param dataSet
*/
public void exportExcel(String sheetName, String[] titles, List<Object[]> dataSet){
//声明工作薄
Workbook workbook = new XSSFWorkbook();

Map<String,CellStyle> styles = createStyles(workbook);
Sheet sheet = workbook.createSheet(sheetName);
PrintSetup printSetup = sheet.getPrintSetup();
printSetup.setLandscape(true);
sheet.setFitToPage(true);
sheet.setHorizontallyCenter(true);
sheet.setDefaultColumnWidth(18);

Row headerRow = sheet.createRow(0);
//设置行高
headerRow.setHeightInPoints(25.75f);
Cell headerCell;
for (int i = 0; i < titles.length; i++) {
headerCell = headerRow.createCell(i);
headerCell.setCellValue(titles[i]);
headerCell.setCellStyle(styles.get("header"));
}

//写入excel
writeExcel(sheet, styles, dataSet);

//开始执行导出操作
String xlsFile = sheetName+"_"+System.currentTimeMillis()+xls;
FileOutputStream out = null;
try {
out = new FileOutputStream(xlsFile);
workbook.write(out);
out.close();
workbook.close();
} catch (FileNotFoundException e) {
logger.error("Not Found" + xlsFile+" exception " + e.getMessage() + " at " + ExcelUtils.class);
} catch (IOException e) {
logger.error("IO Exception" + e.getMessage() + " at " + ExcelUtils.class);
}

}

/**
* create a library of cell styles
*/
private static Map<String, CellStyle> createStyles(Workbook workbook){
Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
CellStyle style;
//表头样式
Font headerFont = workbook.createFont();
headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
headerFont.setFontName("微软雅黑");
headerFont.setFontHeightInPoints((short)10);
headerFont.setColor(IndexedColors.BLACK.getIndex());

style = createBorderedStyle(workbook);
//单元格居中
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
//单元格背景色
style.setFillForegroundColor(IndexedColors.WHITE.getIndex());
style.setFillPattern(CellStyle.SOLID_FOREGROUND);
style.setFont(headerFont);
style.setWrapText(false);//不需要自动换行，如果需要自动换行，设置为true
styles.put("header", style);

//普通单元格样式
Font normalFont = workbook.createFont();
normalFont.setFontHeight((short)5);
style = createBorderedStyle(workbook);
style.setAlignment(CellStyle.ALIGN_LEFT);
style.setWrapText(false);
createBorderedStyle(workbook);
styles.put("cell", style);

return styles;
}

//创建带黑边框样式的单元格
private static CellStyle createBorderedStyle(Workbook wb){
CellStyle style = wb.createCellStyle();
style.setBorderRight(CellStyle.BORDER_THIN);
style.setRightBorderColor(IndexedColors.BLACK.getIndex());
style.setBorderBottom(CellStyle.BORDER_THIN);
style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
style.setBorderLeft(CellStyle.BORDER_THIN);
style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
style.setBorderTop(CellStyle.BORDER_THIN);
style.setTopBorderColor(IndexedColors.BLACK.getIndex());
return style;
}

//写入excel
private void writeExcel(Sheet sheet,Map<String, CellStyle> styles,List<Object[]> dataSet){
Row row;
Cell cell;
int rowNum = 1;
for (int i = 0; i < dataSet.size(); i++,rowNum++) {
row = sheet.createRow(rowNum);
if (null == dataSet.get(i)) {
continue;
}
//开始写入数据
for (int j = 0; j < dataSet.get(i).length; j++) {
cell = row.createCell(j);
cell.setCellValue(dataSet.get(i)[j].toString());
//设置样式
cell.setCellStyle(styles.get("cell"));
}
}
}
}

下面开始写测试代码：

public static void main(String[] args) {
String[] titles = new String[]{"日期","邮箱","应用名称","OS"};
List<Object[]> dataSet = new LinkedList<Object[]>();
for (int i = 0; i <= 1000; i++) {
Object[] obj = new Object[titles.length];
obj[0]= DateUtils.format(new Date(),DateUtils.FORMAT_DATE_ONLY);
obj[1] = "owen" + i + "@163.com";
obj[2] = "开心消消乐" + i + "";
obj[3] = "iOS";

dataSet.add(obj);
}
ExcelUtils excelUtils = new ExcelUtils();
excelUtils.exportExcel("应用信息",titles,dataSet);

}

导出的效果图如下：