将数据库里面的数据导入到Excel（Java）

<span><button class="btn" id="deviceExport">导出</button>
<script>
var User = function(){

this.init = function(){
// 用于导出excel
$("#userExport").click(function() {
var url =  '/user/export/';
location.href = url + "?queryJson="+JSON.stringify(user.acquireInquireData());
});
};

//获取查询条件
this.acquireInquireData = function(){
var inquireCondition = {
name:$('#name').val(),//名称
sex: $('#sex').val(),//性别
age: $('#age').val(),//年龄
};
return inquireCondition;
};
}

var user;
$(function(){
user = new User();
user.init();
});
</script>

public class User{
private String name;
private String sex;
private String age;
//get set方法
}

public interface UserDao{
List<User> getUserForExcel(User user);
}

public interface UserService{
List<User> getUserForExcel(User user);
}

public class serviceImpl implements UserService{

@Autowired
private UserDao userDao;
public List<user> getUserServiceForExcel(User user){
List<User> list=userDao.getUserForExcel(user);
return list;
}

}

@Controller
@RequestMapping("/user")
public class UserController{
@Autowired
private UserService userService;
@RequestMapping("/export")
public void export(HttpServletRequest request,HttpServletResponse response,
@RequestParam(value="queryJson") String queryJson){
User user=JSON.parseObject(queryJson,User.class);
List<User> userList=userService.getUserForExcel(user);
ExportExcel<User> ee=new ExportExcel<User>();
String[] headers={"序号"，“姓名”，“性别”，“年龄”};
String fileName=“用户信息表”；
ee.exportExcel(headers,userList,fileName,response);
}

}

<select id="getUserForExcel" parametertype="User" resulttype="User">
select name,sex,age
from juser_table
where  1=1 and
and  name=#{name}
and  sex=#{sex}
and  age=#{age}
</select>

public class ExportExcel<t>{
public void exportExcel(String[] headers,Collection<t> dataset, String fileName,HttpServletResponse response) {
XSSFWork workbook=new XSSFWork();
XSSFSheet sheet=workbook.createSheet(fileName);
sheet.setDeaultColumnWidth((short)20);//设置默认宽度为15个字节
XSSFRow row=sheet.createRow(0);
for (short i = 0; i < headers.length; i++) {
XSSFCell cell = row.createCell(i);
XSSFRichTextString text = new XSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
try {
// 遍历集合数据，产生数据行
Iterator<t> it = dataset.iterator();
int index = 0;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
T t = (T) it.next();
// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
Field[] fields = t.getClass().getDeclaredFields();
for (short i = 0; i < headers.length; i++) {
XSSFCell cell = row.createCell(i);
Field field = fields[i];
String fieldName = field.getName();
String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);

dfd3
Class tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});
// 判断值的类型后进行强制类型转换
String textValue = null;
// 其它数据类型都当作字符串简单处理
if(value != null && value != ""){
textValue = value.toString();
}
if (textValue != null) {
XSSFRichTextString richString = new XSSFRichTextString(textValue);
cell.setCellValue(richString);
}
}
}
getExportedFile(workbook, fileName,response);
} catch (Exception e) {
e.printStackTrace();
}
}
public void getExportedFile(XSSFWorkbook workbook, String name,HttpServletResponse response) throws Exception {
BufferedOutputStream fos = null;
try {
String fileName = name+DateUtil.parseSmallDate(new Date()) + ".xlsx";
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition", "attachment;filename=" + new String( fileName.getBytes("gb2312"), "ISO8859-1" ));
fos = new BufferedOutputStream(response.getOutputStream());
workbook.write(fos);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fos != null) {
fos.close();
}
}
}
}