poi导出到excel方法封装

package com.tgb.lk;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExportTest02 {
public static void main(String[] args) {
// 初始化数据
List<Map> list = new ArrayList<Map>();
for (int i = 0; i < 10; i++) {
Map map = new HashMap();
map.put("id", i);
map.put("name", "姓名" + i);
list.add(map);
}

String[] alias = { "编号", "姓名" };// excel的列头
String[] names = { "id", "name" };// 数据List中的Map的key值.
FileOutputStream out = null;
try {
out = new FileOutputStream("d:\\success2.xls");
} catch (FileNotFoundException e) {
e.printStackTrace();
}

exportExcel(list, alias, names, "学生信息表", 60000, out);
System.out.println("----执行完毕----------");
}

/**
* 对list数据源将其里面的数据导入到excel表单
*
* @param fieldName
*            [] 导出到excel文件里的表头名
* @param columnIt
*            [] 导出到excel文件里的表头NAME
* @param sheetName
*            工作表的名称
* @param sheetSize
*            每个sheet中数据的行数,此数值必须小于65536
* @param output
*            java输出流
*/
public static boolean exportExcel(List list, String[] fieldName,
Object[] columnIt, String sheetName, int sheetSize,
OutputStream output) {
HSSFWorkbook workbook = new HSSFWorkbook();// 产生工作薄对象
if (sheetSize >= 65536) {
sheetSize = 65536;
}
double sheetNo = Math.ceil(list.size() / sheetSize);
for (int index = 0; index <= sheetNo; index++) {
HSSFSheet sheet = workbook.createSheet();// 产生工作表对象
workbook.setSheetName(index, sheetName+index);//设置工作表的名称.
HSSFRow row = sheet.createRow(0);// 产生一行
HSSFCell cell;// 产生单元格

// 写入各个字段的名称
for (int i = 0; i < fieldName.length; i++) {
cell = row.createCell(i); // 创建第一行各个字段名称的单元格
cell.setCellType(HSSFCell.CELL_TYPE_STRING); // 设置单元格内容为字符串型
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// //为了能在单元格中输入中文,设置字符集为UTF_16
cell.setCellValue(fieldName[i]); // 给单元格内容赋值
}

int startNo = index * sheetSize;
int endNo = Math.min(startNo + sheetSize, list.size());
// 写入各条记录,每条记录对应excel表中的一行
for (int i = startNo; i < endNo; i++) {
row = sheet.createRow(i + 1 - startNo);
HashMap map = (HashMap) list.get(i);
for (int j = 0; j < columnIt.length; j++) {
cell = row.createCell(j);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
Object value = map.get(columnIt[j]);
if (value != null) {
cell.setCellValue(map.get(columnIt[j]).toString());
} else
cell.setCellValue("");
}
}
}
try {
output.flush();
workbook.write(output);
output.close();
return true;
} catch (IOException e) {
e.printStackTrace();
System.out.println("Output is closed ");
return false;
}

}
}