poi报表实现，导出到excel文件

package cn.lmj.utils;

import java.io.OutputStream;

import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFFont;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.hssf.util.HSSFColor;

public class ExcelFileGenerator

{

private final int SPLIT_COUNT = 1500;// Excel每个工作簿的行数

private List<String> fieldName = null; // Excel标题数据集

private List<List<String>> fieldData = null; // Excel数据内容

private HSSFWorkbook workbook = null;

public ExcelFileGenerator(List<String> fieldName,

List<List<String>> fieldData)

{

this.fieldName = fieldName;

this.fieldData = fieldData;

}

public HSSFWorkbook createWorkbook()

{

workbook = new HSSFWorkbook();

int rows = fieldData.size();

int sheetNum = 0;

if (rows % SPLIT_COUNT == 0)

{

sheetNum = rows / SPLIT_COUNT;

}

else

{

sheetNum = rows / SPLIT_COUNT + 1;

}

for (int i = 1; i <=sheetNum; i++)

{

HSSFSheet sheet = workbook.createSheet("Page" + i);

HSSFRow headRow = sheet.createRow((short) 0);

for (int j = 0; j < fieldName.size(); j++)

{

HSSFCell cell = headRow.createCell((short) j);

// 添加样式

cell.setCellType(HSSFCell.CELL_TYPE_STRING);

cell.setEncoding(HSSFCell.ENCODING_UTF_16);

// 设置所有单元格的宽度

sheet.setColumnWidth((short) j, (short) 6000);

// 创建样式(使用工作本的对象创建)

HSSFCellStyle cellStyle = workbook.createCellStyle();

// 创建字体的对象

HSSFFont font = workbook.createFont();

// 将字体加粗

font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

// 设置字体的颜色

short color = HSSFColor.RED.index;

font.setColor(color);

// 将新设置的字体属性放置到样式中

cellStyle.setFont(font);

if (fieldName.get(j) != null)

{

cell.setCellStyle(cellStyle);

cell.setCellValue(fieldName.get(j));

}

else

{

cell.setCellStyle(cellStyle);

cell.setCellValue("-");

}

}

for (int k = 0; k < (rows < SPLIT_COUNT ? rows : SPLIT_COUNT); k++)

{

HSSFRow row = sheet.createRow((short) (k + 1));

List<String> rowList = fieldData.get((i - 1) * SPLIT_COUNT + k);

for (int n = 0; n < rowList.size(); n++)

{

HSSFCell cell = row.createCell((short) n);

cell.setEncoding(HSSFCell.ENCODING_UTF_16);

if (rowList.get(n) != null)

{

cell.setCellValue(rowList.get(n));

}

else

{

cell.setCellValue("");

}

}

}

}

return workbook;

}

public void expordExcel(OutputStream os) throws Exception

{

workbook = createWorkbook();

workbook.write(os);

os.close();

}

}