加入對應的jar包，包括springmvc,poi的，

<!-- poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>${poi.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-examples</artifactId>
            <version>${poi.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-scratchpad</artifactId>
            <version>${poi.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>${poi.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>${poi.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-excelant</artifactId>
            <version>${poi.version}</version>
        </dependency>

        public class Project {
            private Integer id;
            private String name;
            private String technology;//所用技術
            private String remarks;//備註
            //省略setter/getter
        }

控制器類：

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.springframework.stereotype.Controller;

import com.entity.Project;
import com.util.ExcelUtil;

[@Controller](http://my.oschina.net/u/1774615)
public classDownloadAct{
    @RequestMapping(value="download_project.do")
    public String download(HttpServletRequest request,HttpServletResponse response) throws IOException{
        String fileName="excel檔案";
        //填充projects資料
        List<Project> projects=createData();
        List<Map<String,Object>> list=createExcelRecord(projects);
        String columnNames[]={"ID","專案名","銷售人","負責人","所用技術","備註"};//列名
        String keys[]    =     {"id","name","saler","principal","technology","remarks"};//map中的key
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ExcelUtil.createWorkBook(list,keys,columnNames).write(os);
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] content = os.toByteArray();
        InputStream is = new ByteArrayInputStream(content);
        // 設定response引數，可以開啟下載頁面
        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();
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            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) {
            throw e;
        } finally {
            if (bis != null)
                bis.close();
            if (bos != null)
                bos.close();
        }
        return null;
    }
    private List<Project> createData() {
        // TODO Auto-generated method stub
        //自己實現
        return null;
    }
    private List<Map<String, Object>> createExcelRecord(List<Project> 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);
        Project 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());
            mapValue.put("technology", project.getTechnology());
            mapValue.put("remarks", project.getRemarks());
            listmap.add(mapValue);
        }
        return listmap;
    }
}

Excel工具類：

import java.util.List;
import java.util.Map;

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;
/**
 * 匯出Excel文件工具類
 * [@author](http://my.oschina.net/arthor) 那位先生
 * [@date](http://my.oschina.net/u/2504391) 2014-8-6
 * */
public classExcelUtil{

    /**
     * 建立excel文件，
     * [@param](http://my.oschina.net/u/2303379) list 資料
     * @param keys list中map的key陣列集合
     * @param columnNames excel的列名
     * */
    public static Workbook createWorkBook(List<Map<String, Object>> list,String []keys,String columnNames[]) {
        // 建立excel工作簿
        Workbook wb = new HSSFWorkbook();
        // 建立第一個sheet（頁），並命名
        Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
        // 手動設定列寬。第一個引數表示要為第幾列設；，第二個引數表示列的寬度，n為列高的畫素數。
        for(int i=0;i<keys.length;i++){
            sheet.setColumnWidth((short) i, (short) (35.7 * 150));
        }

        // 建立第一行
        Row row = sheet.createRow((short) 0);

        // 建立兩種單元格格式
        CellStyle cs = wb.createCellStyle();
        CellStyle cs2 = wb.createCellStyle();

        // 建立兩種字型
        Font f = wb.createFont();
        Font f2 = wb.createFont();

        // 建立第一種字型樣式（用於列名）
        f.setFontHeightInPoints((short) 10);
        f.setColor(IndexedColors.BLACK.getIndex());
        f.setBoldweight(Font.BOLDWEIGHT_BOLD);

        // 建立第二種字型樣式（用於值）
        f2.setFontHeightInPoints((short) 10);
        f2.setColor(IndexedColors.BLACK.getIndex());

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

        // 設定第一種單元格的樣式（用於列名）
        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);

        // 設定第二種單元格的樣式（用於值）
        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);
        //設定列名
        for(int i=0;i<columnNames.length;i++){
            Cell cell = row.createCell(i);
            cell.setCellValue(columnNames[i]);
            cell.setCellStyle(cs);
        }
        //設定每行每列的值
        for (short i = 1; i < list.size(); i++) {
            // Row 行,Cell 方格 , Row 和 Cell 都是從0開始計數的
            // 建立一行，在頁sheet上
            Row row1 = sheet.createRow((short) i);
            // 在row行上建立一個方格
            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);
            }
        }
        return wb;
    }

}

在jsp頁面中新增

    <input type="button" value="匯出資料" onclick="download()"/>

js中新增

    functiondownload(){
        var url="download_customer.do";
        window.open(url);
    }

問題：可能有些瀏覽器會把window.open(url)這個操作給禁止掉，所以會出現程式碼執行結束但是彈出框不出現的情況，遇到這種情況，最簡單的方法就是使用location.href=url；如果一定要新視窗彈出，建議google一下如何解決window.open()被瀏覽器禁止的替換方法。