基于Spring3 MVC实现批量导出数据成Excel文件！

<button onclick="download()" class="btn btn-warning " type="button">批量导出Excel <i class="fa fa-download"></i></button>

<script type="text/javascript">
//导出信息函数
function download(){
if(confirm("是否要导出数据？")){
var url = "${path}/master/child/downloadChild";
$.post(url,function(data){
alert(data.message);
});
}
}
</script>

@RequestMapping(value = "downloadChild", method = RequestMethod.POST)
@ResponseBody
public Map<String, Object> downloadChild() throws Exception {
Date date = new Date();
DateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String fileName = sdf.format(date);
//得到桌面路径
File desktopDir = FileSystemView.getFileSystemView().getHomeDirectory();
String desktopPath = desktopDir.getAbsolutePath();
String desktopDirPath = desktopPath.replace("\\","\\\\");
String filePath = desktopDirPath + "\\\\" +fileName + ".xls";
//System.out.println(filePath);
String[] titles = {"年级班级名称","幼儿学号","姓名","性别","年龄","出生日期","添加幼儿时间","删除标志","父亲姓名","父亲电话","父亲工作单位","母亲姓名","母亲电话","母亲工作单位","家庭住址","备注"};
Map<String, Object> params = new HashMap<String, Object>();
List<Child> listsChild = childService.queryAll(params);
Grades grades = new Grades();
SimpleDateFormat dateFormater = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
List<Map<Integer, String>> lists = new ArrayList<Map<Integer,String>>();
for (int i = 0; i < listsChild.size(); i++) {
Child child =  listsChild.get(i);
Map<Integer, String> paramsLists = new HashMap<Integer, String>();
//通过child.getGradesId()来查询班级名称
grades = gradesService.queryBean(child.getGradesId());
paramsLists.put(0, grades.getGradesName());
paramsLists.put(1, child.getChildNo());
paramsLists.put(2, child.getChildName());
paramsLists.put(3, child.getSex());
paramsLists.put(4, child.getAge().toString());
paramsLists.put(5, child.getBrithDay());
//格式化添加幼儿时间
paramsLists.put(6, dateFormater.format(child.getAddDate()));
paramsLists.put(7, child.getDr());
paramsLists.put(8, child.getFatherName());
paramsLists.put(9, child.getFatherPhone());
paramsLists.put(10, child.getFatherWork());
paramsLists.put(11, child.getMotherName());
paramsLists.put(12, child.getMotherPhone());
paramsLists.put(13, child.getMotherWork());
paramsLists.put(14, child.getAddress());
paramsLists.put(15, child.getComments());
lists.add(paramsLists);
}
ExcelUtil.writeExcel(filePath, titles, lists);
Map<String,Object> json = new HashMap<String, Object>();
json.put("message", "导出Excel文件到桌面，文件名为：" + fileName + ".xls");
return json;
}

public class ExcelUtil {
/**
* @info 写出Excel标题
* @param fos
* @return
*/
public static void writeExcelTitle(String filePath, String[] ss)
throws IOException {
OutputStream fos = new FileOutputStream(filePath);
HSSFWorkbook xls = new HSSFWorkbook();
HSSFSheet sheet = xls.createSheet();
HSSFRow row = sheet.createRow(0);// 第一行
for (int i = 0; i < ss.length; i++) {
row.createCell(i).setCellValue(ss[i]);
}
xls.write(fos);
fos.close();
}

/**
* @info 写出Excel标题内容
* @param fos
* @return
*/
public static byte[] writeExcel(String[] titles,
List<Map<Integer, String>> lists) throws IOException {
HSSFWorkbook xls = new HSSFWorkbook();
HSSFSheet sheet = xls.createSheet();
HSSFRow row = sheet.createRow(0);// 第一行

for (int i = 0; i < titles.length; i++) {
row.createCell(i).setCellValue(titles[i]);
}
// 内容
int rowNum = 1;
for (Map<Integer, String> map : lists) {
HSSFRow rowTmp = sheet.createRow(rowNum);
int cols = map.size();
for (int i = 0; i < cols; i++) {
rowTmp.createCell(i).setCellValue(map.get(i));
}
rowNum++;
}
ByteArrayOutputStream fos = new ByteArrayOutputStream();
xls.write(fos);
byte[] buf = fos.toByteArray();// 获取内存缓冲区中的数据
fos.close();
return buf;
}

/**
* @info 写出Excel标题内容
* @param fos
* @return
*/
public static void writeExcel(String filePath, String[] titles,
List<Map<Integer, String>> lists) throws IOException {
OutputStream fos = new FileOutputStream(filePath);
HSSFWorkbook xls = new HSSFWorkbook();
HSSFSheet sheet = xls.createSheet();
HSSFRow row = sheet.createRow(0);// 第一行

for (int i = 0; i < titles.length; i++) {
row.createCell(i).setCellValue(titles[i]);
}
// 内容
int rowNum = 1;
for (Map<Integer, String> map : lists) {
HSSFRow rowTmp = sheet.createRow(rowNum);
int cols = map.size();
for (int i = 0; i < cols; i++) {
rowTmp.createCell(i).setCellValue(map.get(i));
}
rowNum++;
}
xls.write(fos);
fos.close();
}

/**
* @info 读取Excel内容，List行，MAP行数据
* @param filePath
* @return
*/
public static List<Map<String, String>> readExcelKeyMap(String filePath)
throws IOException {
List<Map<String, String>> contents = new LinkedList<Map<String, String>>();
InputStream is = new FileInputStream(filePath);
POIFSFileSystem fs = new POIFSFileSystem(is);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
// 得到总行数
int rowNum = sheet.getLastRowNum();

HSSFRow row = sheet.getRow(0);// 第一行
// 总列数
int colNum = row.getPhysicalNumberOfCells();

// 正文内容应该从第二行开始,第一行为表头的标题
String[] keys = readExcelTitle(filePath);
for (int i = 1; i <= rowNum; i++) {
row = sheet.getRow(i);
int j = 0;
Map<String, String> content = new HashMap<String, String>();
while (j < colNum) {
String cellValue = getCellFormatValue(row.getCell(j)).trim();

content.put(keys[j], cellValue);
j++;
}
contents.add(content);
}
is.close();
return contents;
}

public static List<Map<String, String>> readExcelKeyMap(InputStream is)
throws IOException {
List<Map<String, String>> contents = new LinkedList<Map<String, String>>();
POIFSFileSystem fs = new POIFSFileSystem(is);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
// 得到总行数
int rowNum = sheet.getLastRowNum();

HSSFRow row = sheet.getRow(0);// 第一行
// 总列数
int colNum = row.getPhysicalNumberOfCells();

// 正文内容应该从第二行开始,第一行为表头的标题
// 标题总列数
String[] keys = new String[colNum];
for (int i = 0; i < colNum; i++) {
keys[i] = getCellFormatValue(row.getCell(i));
}
for (int i = 1; i <= rowNum; i++) {
row = sheet.getRow(i);
int j = 0;
Map<String, String> content = new HashMap<String, String>();
while (j < colNum) {
String cellValue = getCellFormatValue(row.getCell(j)).trim();

content.put(keys[j], cellValue);
j++;
}
contents.add(content);
}
is.close();
return contents;
}

/**
* @info 读取Excel标题
* @param is
* @return
*/
public static String[] readExcelTitle(String filePath) throws IOException {
InputStream is = new FileInputStream(filePath);
POIFSFileSystem fs = new POIFSFileSystem(is);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(0);// 第一行
// 标题总列数
int colNum = row.getPhysicalNumberOfCells();
String[] title = new String[colNum];
for (int i = 0; i < colNum; i++) {
title[i] = getCellFormatValue(row.getCell(i));
}
is.close();
return title;
}

/**
* @info 读取Excel内容，List行，MAP行数据
* @param filePath
* @return
*/
public static List<Map<Integer, String>> readExcelContent(String filePath)
throws IOException {
List<Map<Integer, String>> contents = new LinkedList<Map<Integer, String>>();
InputStream is = new FileInputStream(filePath);
POIFSFileSystem fs = new POIFSFileSystem(is);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
// 得到总行数
int rowNum = sheet.getLastRowNum();

HSSFRow row = sheet.getRow(0);// 第一行
// 总列数
int colNum = row.getPhysicalNumberOfCells();

// 正文内容应该从第二行开始,第一行为表头的标题

for (int i = 1; i <= rowNum; i++) {
row = sheet.getRow(i);
int j = 0;
Map<Integer, String> content = new HashMap<Integer, String>();
while (j < colNum) {
String cellValue = getCellFormatValue(row.getCell(j)).trim();
content.put(j, cellValue);
j++;
}
contents.add(content);
}
is.close();
return contents;
}

/**
* @info 读取Excel值
* @param cell
* @return
*/
static String getCellFormatValue(HSSFCell cell) {
String cellvalue = "";

if (cell != null) {
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC: {
BigDecimal b = new BigDecimal(cell.getNumericCellValue());
cellvalue = b.toPlainString();
break;
}
case HSSFCell.CELL_TYPE_FORMULA: {
cell.setCellType(Cell.CELL_TYPE_STRING);
cellvalue = cell.getStringCellValue();
//System.out.println(cellvalue);
break;
}
case HSSFCell.CELL_TYPE_STRING:
cellvalue = cell.getRichStringCellValue().getString();
//System.out.println(cellvalue);
break;
default:
cellvalue = "";
}
} else {
cellvalue = "";
}
return cellvalue;

}

/**
* @info 读取Excel值
* @param cell
* @return
*/
static String getStringCellValue(HSSFCell cell) {
String strCell = "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
strCell = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_NUMERIC:
strCell = String.valueOf(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
strCell = String.valueOf(cell.getBooleanCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK:
strCell = "";
break;
default:
strCell = "";
break;
}
if (strCell.equals("") || strCell == null) {
return "";
}
return strCell;
}
}