JAVA实现EXCEL导出

多说无益，直接上代码

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
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.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping(value = "/analyze")
public class AnalyzeController {

	@RequestMapping(value = "/export")
	public void excelExport(HttpServletRequest request,
			HttpServletResponse response) {
		String fileName = "文件名";
		// 填充projects数据
		List<TestAnalyzeModal> projects = createData();
		List<Map<String, Object>> list = createExcelRecord(projects);
		String columnNames[] = {"ID","姓名" };// 列名
		String keys[] = {  "id", "name" };// map中的key
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		try {
			createWorkBook(list, keys, columnNames).write(os);
		} catch (IOException e) {
		}
		byte[] content = os.toByteArray();
		InputStream is = new ByteArrayInputStream(content);
		// 设置response参数，可以打开下载页面
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;
		try {
			response.reset();
			response.setContentType("application/vnd.ms-excel;charset=utf-8");
			response.setHeader("Content-Disposition", "attachment;filename="
					+ new String((fileName + ".xls").getBytes(), "iso-8859-1"));
			ServletOutputStream out = response.getOutputStream();
			bis = new BufferedInputStream(is);
			bos = new BufferedOutputStream(out);
			byte[] buff = new byte[2048];
			int bytesRead;
			// Simple read/write loop.
			while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
				bos.write(buff, 0, bytesRead);
			}
		} catch (final IOException e) {
			try {
				throw e;
			} catch (IOException e1) {
			}
		} finally {
			if (bis != null)
				try {
					bis.close();
				} catch (IOException e) {
					
				}
			if (bos != null)
				try {
					bos.close();
				} catch (IOException e) {
					
				}
		}
	}

	private List<TestAnalyzeModal> createData() {
		List<TestAnalyzeModal> list = new ArrayList<TestAnalyzeModal>();

		//数据绑定
		return list;
	}

	private List<Map<String, Object>> createExcelRecord(
			List<TestAnalyzeModal> projects) {
		List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>();
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("sheetName", "sheet1");
		listmap.add(map);
		TestAnalyzeModal project = null;
		for (int j = 0; j < projects.size(); j++) {
			project = projects.get(j);
			Map<String, Object> mapValue = new HashMap<String, Object>();
			mapValue.put("id", project.getId());
			mapValue.put("name", project.getName());
			
			listmap.add(mapValue);
		}
		return listmap;
	}

	/**
	 * 创建excel文档，
	 * 
	 * @param list
	 *            数据
	 * @param keys
	 *            list中map的key数组集合
	 * @param columnNames
	 *            excel的列名
	 * */
	public static Workbook createWorkBook(List<Map<String, Object>> list,
			String[] keys, String columnNames[]) {
		// 创建excel工作簿
		Workbook wb = new HSSFWorkbook();
		// 创建第一个sheet（页），并命名
		Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
	
		// 手动设置列宽。第一个参数表示要为第几列设；，第二个参数表示列的宽度，n为列高的像素数。
		for (int i = 0; i < keys.length; i++) {
			sheet.setColumnWidth((short) i, (short) (35.7 * 150));
		}

		// 创建第一行
		Row row = sheet.createRow((short) 1);

		// 创建两种单元格格式
		CellStyle cs = wb.createCellStyle();
		CellStyle cs2 = wb.createCellStyle();

		// 创建两种字体
		Font f = wb.createFont();
		Font f2 = wb.createFont();

		// 创建第一种字体样式（用于列名）
		f.setFontHeightInPoints((short) 10);
		f.setColor(IndexedColors.BLACK.getIndex());
		f.setBoldweight(Font.BOLDWEIGHT_BOLD);

		// 创建第二种字体样式（用于值）
		f2.setFontHeightInPoints((short) 10);
		f2.setColor(IndexedColors.BLACK.getIndex());

		// Font f3=wb.createFont();
		// f3.setFontHeightInPoints((short) 10);
		// f3.setColor(IndexedColors.RED.getIndex());

		// 设置第一种单元格的样式（用于列名）
		cs.setFont(f);
		cs.setBorderLeft(CellStyle.BORDER_THIN);
		cs.setBorderRight(CellStyle.BORDER_THIN);
		cs.setBorderTop(CellStyle.BORDER_THIN);
		cs.setBorderBottom(CellStyle.BORDER_THIN);
		cs.setAlignment(CellStyle.ALIGN_CENTER);

		// 设置第二种单元格的样式（用于值）
		cs2.setFont(f2);
		cs2.setBorderLeft(CellStyle.BORDER_THIN);
		cs2.setBorderRight(CellStyle.BORDER_THIN);
		cs2.setBorderTop(CellStyle.BORDER_THIN);
		cs2.setBorderBottom(CellStyle.BORDER_THIN);
		cs2.setAlignment(CellStyle.ALIGN_CENTER);
		
		//合并单元格
		int num = 2;
		Row rowFirst = sheet.createRow((short) 0);
		Cell cellFirst=rowFirst.createCell(num);
		cellFirst.setCellValue("value");
		cellFirst.setCellStyle(cs);
	
		//CellRangeAddress(起始行,结束行,起始列,结束)
		//合并行
		sheet.addMergedRegion(new CellRangeAddress(0,0,2,5));
		
		//合并列
		sheet.addMergedRegion(new CellRangeAddress(0,1,0,0));
		
		
		// 设置列名
		for (int i = 0; i < columnNames.length; i++) {
			Cell cell = row.createCell(i);
			cell.setCellValue(columnNames[i]);
			cell.setCellStyle(cs);
		}
		// 设置每行每列的值
		for (short i = 1; i < list.size(); i++) {
			// Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的
			// 创建一行，在页sheet上
			Row row1 = sheet.createRow((short) i+1);
			// 在row行上创建一个方格
			for (short j = 0; j < keys.length; j++) {
				Cell cell = row1.createCell(j);	
				cell.setCellValue(list.get(i).get(keys[j]) == null ? " " : list
						.get(i).get(keys[j]).toString());
				cell.setCellStyle(cs2);
			}
		}
		
		Row  bottom= sheet.createRow((short) list.size()+3);
		String title = "说明";
		Cell bottomCell=bottom.createCell(0);
		bottomCell.setCellValue(new HSSFRichTextString(title));
                //自动换行
		cs2.setWrapText(true); 
                //左对齐
		cs2.setAlignment(CellStyle.ALIGN_LEFT);
		bottomCell.setCellStyle(cs2);
		sheet.addMergedRegion(new CellRangeAddress(list.size()+3,list.size()+7,0,10));
		return wb;
	}
}