springmvc导出excel并弹出下载框

加入对应的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;//所用技术
private String remarks;//备注
//省略setter/getter
}

控制器类：

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 class DownloadAct {
@RequestMapping(value="download_project.do")
public String download(HttpServletRequest request,HttpServletResponse response) throws IOException{
String fileName="excel文件";
//填充projects数据
List<Project> projects=createData();
List<Map<String,Object>> list=createExcelRecord(projects);
String columnNames[]={"ID","项目名","销售人","负责人","所用技术","备注"};//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);
// 设置response参数，可以打开下载页面
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
//自己实现
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工具类：

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;
/**
* 导出Excel文档工具类
* [@author](http://my.oschina.net/arthor) 那位先生
* [@date](http://my.oschina.net/u/2504391) 2014-8-6
* */
public class ExcelUtil {

/**
* 创建excel文档，
* [@param](http://my.oschina.net/u/2303379) 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) 0);

// 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);
//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);
// 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);
}
}
return wb;
}

}

在jsp页面中添加

<input type="button" value="导出数据" onclick="download()"/>

js中添加

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

问题：可能有些浏览器会把window.open(url)这个操作给禁止掉，所以会出现代码运行结束但是弹出框不出现的情况，遇到这种情况，最简单的方法就是使用location.href=url；如果一定要新窗口弹出，建议google一下如何解决window.open()被浏览器禁止的替换方法。