使用POI导出Excel实例方法 v1.0

/**
* @instructions 如果目录不存在，首先创建
* @author jiyanle 2014-03-26
* @return
*/
public String createDirectory(String dirName) {
File dir = new File(dirName);
if (dir.exists()) {
System.out.println("目录" + dirName + "已经创建");
}
else {
if (dir.mkdirs()) {
System.out.println("创建目录" + dirName + "成功！");
}
else {
System.out.println("创建目录" + dirName + "失败！");
}
}
return dirName;
}

/**
* @instructions 导出Excel表格
* @author jiyanle 2014-03-26
* @return
*/
@SuppressWarnings("unchecked")
public String exportExcel(){
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
try{
//定义action返回ajax的xml文件的字符范围及返回类型
response.setContentType("text/xml; charset=utf-8");
response.setHeader("Cache-Contorl", "no-cache");
PrintWriter out = response.getWriter();

// 创建Excel的工作书册 Workbook,对应到一个excel文档
HSSFWorkbook workbook = new HSSFWorkbook();

// 创建Excel的工作sheet,对应到一个excel文档的tab
HSSFSheet sheet = workbook.createSheet("公共场所信息");

// 设置excel每列宽度
sheet.setColumnWidth(0, 50*256);
sheet.setColumnWidth(1, 15*256);
sheet.setColumnWidth(2, 30*256);
sheet.setColumnWidth(3, 15*256);

// 创建字体样式
HSSFFont font = workbook.createFont();
font.setFontName("Verdana");
font.setBoldweight((short) 100);
font.setFontHeight((short) 300);

// 创建单元格样式
HSSFCellStyle style = workbook.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
style.setFont(font);// 设置字体

//---------需要导入的数据集----------
List resultList = (List) request.getSession().getAttribute("resultList");
//标识位
String flag = request.getParameter("flag");

//写入标题
HSSFRow row_1 = sheet.createRow(0);

HSSFCell cell_1 = row_1.createCell(0);
cell_1.setCellStyle(style);
cell_1.setCellValue("单位名称");

cell_1 = row_1.createCell(1);
cell_1.setCellStyle(style);
cell_1.setCellValue("姓名");

cell_1 = row_1.createCell(2);
cell_1.setCellStyle(style);
cell_1.setCellValue("许可证号");

cell_1 = row_1.createCell(3);
cell_1.setCellStyle(style);
cell_1.setCellValue("批准日期");

if (resultList != null && resultList.size() > 0) {
for (int i = 0; i < resultList.size(); i++) {
String ggcsDwmc = "";
String fddbr = "";
String xkzh = "";
String pzrq = "";

if(!"qzdpp".equals(flag)){
Ggcs ggcs = (Ggcs) resultList.get(i);
ggcsDwmc = ggcs.getGgcsbjdDwmc();// 单位名称
fddbr = ggcs.getGgcsbjdFzr();// 法定代表人姓名
xkzh = ggcs.getGgcsbjdXkzhw() + "卫"
+ ggcs.getGgcsbjdXkzhz() + " 字["
+ ggcs.getGgcsbjdXkzhk() + "]第"
+ ggcs.getGgcsbjdXkzhh() + "号";
pzrq = ggcs.getGgcsbjdXkzpzrq();// 批准日期
}else{
Object[] obj = (Object[])resultList.get(i);
ggcsDwmc = obj[0]==null?"":(String)obj[0];// 单位名称
fddbr = obj[10]==null?"":(String)obj[10];// 法定代表人姓名
xkzh = (obj[2]==null?"":(String)obj[2]) + "卫"
+ (obj[3]==null?"":(String)obj[3]) + " 字["
+ (obj[4]==null?"":(String)obj[4]) + "]第"
+ (obj[5]==null?"":(String)obj[5]) + "号";
pzrq = obj[6]==null?"":(String)obj[6];// 批准日期
}

HSSFRow row_2 = sheet.createRow(i+1);

HSSFCell cell_2 = row_2.createCell(0);
cell_2.setCellValue(ggcsDwmc);
cell_2 = row_2.createCell(1);
cell_2.setCellValue(fddbr);
cell_2 = row_2.createCell(2);
cell_2.setCellValue(xkzh);
cell_2 = row_2.createCell(3);
cell_2.setCellValue(pzrq);
}
}

Date currDate = new Date();
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH.mm.ss");
String currTime = format.format(currDate);
String fileName = "未命名"+ currTime +".xls";
if("search".equals(flag)){
fileName = "公共场所全文检索列表"+ currTime +".xls";//默认导出的文件名
}else if("qzdpp".equals(flag)){
fileName = "公共场所全字段匹配列表"+ currTime +".xls";//默认导出的文件名
}else{
fileName = "公共场所基本查询列表"+ currTime +".xls";//默认导出的文件名
}

String dirName = "D:\\reports\\";//默认导出的路径
dirName = this.createDirectory(dirName);
try {
FileOutputStream os = new FileOutputStream(dirName+fileName);
workbook.write(os);
os.close();

return null;

} catch (Exception e) {
e.printStackTrace();
log.error("公共场所导出Excel时出错！", e);
return "dbError";
}
}

//导出Excel方法
function exportExcel(){
<%
if(null != request.getAttribute("ggcsAllList") && ((List)request.getAttribute("ggcsAllList")).size() > 0){
request.getSession().setAttribute("resultList", request.getAttribute("ggcsAllList"));
%>
$.ajax({
type:"post",
url:"ggcsAction!exportExcel.do
",
dataType: "text",
data:"flag=ggcsnormal",
contentType:"application/x-www-form-urlencoded; charset=utf-8",
success: function (data) {
alert(data);
}
});
<%}else{%>
alert("当前列表无数据，无须导出！");
<%}%>
}
}

// 写入文件
FileOutputStream os = new FileOutputStream("/" + "unnamed" + ".xls");
workbook.write(os);
os.close();
// 将文件导出
response.setHeader("Content-disposition", "attachment;filename=" + toUtf8String(fileName + ".xls"));
response.setHeader("Content-Type", "application/octet-stream");
OutputStream ouputStream = response.getOutputStream();
workbook.write(ouputStream);
ouputStream.flush();
ouputStream.close();

/**
* @功能:转码
* @param s 需要转码的字符串
* @instructions 如果目录不存在，首先创建
* @author jiyanle 2014-03-28
* @return
*/
public String toUtf8String(String s) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c >= 0 && c <= 255) {
sb.append(c);
}
else {
byte[] b;
try {
b = Character.toString(c).getBytes("utf-8");
}
catch (Exception ex) {
b = new byte[0];
}
for (int j = 0; j < b.length; j++) {
int k = b[j];
if (k < 0) {
k += 256;
}
sb.append("%" + Integer.toHexString(k).toUpperCase());
}
}
}
return sb.toString();
}