标签:version lse etl 一句话 fir 工作薄 类型转换 转换 gen
知识点:前端表格数据,调用后台接口,导出excel文件数据,使用到Apache POI接口
POI提供API给Java程序对Microsoft Office格式档案读和写的功能。
(1)在pom.xml中引入POI和文件读写相关的包
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
</dependency>
(2)Controller层,表格导出接口
/**
* 导出数据
*/
@RequestMapping("/Export")
public void export(HttpServletRequest request,HttpServletResponse response){
Export<Equipment> ee = new Export<Equipment>();//equipment实体类
List<Equipment> equiplist = equipmentService.getEquipmentList(); //equiplist是查询的数据集合
String [] headers = {"e_id","e_code","e_location","e_ip","e_attend_code","cruser","crtime","upuser","uptime"};//表格头数据设置
String fileName = "设备列表数据"; //excel表格名称
response.setContentType("application/x-msdownload");
ServletOutputStream outputStream = null; //outputStream文件输出流
try
{
fileName = fileName + ".xls";// 定义文件格式
if (request.getHeader("USER-AGENT").toLowerCase().contains("firefox"))// 火狐
{
response.setHeader("Content-Disposition",
"attachment;fileName=" + new String(fileName.getBytes("UTF-8"), "ISO-8859-1"));
}
else
{
response.setHeader("Content-Disposition",
"attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
}
outputStream = response.getOutputStream();
try {
ee.Export(headers, fileName, equiplist, outputStream);//表格导出工具类
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
catch (UnsupportedEncodingException e)
{
throw new BusinessException("导出失败!");
}
catch (IOException e)
{
throw new BusinessException("导出失败!");
}
catch (NoSuchMethodException e)
{
LOGGER.error(e.getMessage());
}
catch (IllegalAccessException e)
{
LOGGER.error(e.getMessage());
} finally
{
IOUtils.closeQuietly(outputStream);//
}
}
(3)Export.java 表格导出工具类
package com.agesun.attendance.common;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
/**
* <一句话功能简述> <功能详细描述>
*
* @author nishuai
* @version [版本号, 2018年06月14日]
* @see [相关类/方法]
* @since [产品/模块版本]
*/
public class Export<T>
{
public void Export(String[] headers, String fileName, List<T> dataset, OutputStream outputStream)
throws NoSuchMethodException, InvocationTargetException, IllegalAccessException
{
// 声明一个工作薄
HSSFWorkbook wb = new HSSFWorkbook();
// 声明一个单子并命名
HSSFSheet sheet = wb.createSheet(fileName);
/****************** 头部样式 ***********************/
HSSFFont font = wb.createFont();
font.setFontName("微软雅黑");
font.setFontHeightInPoints((short)14);// 设置字体大小
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 给单子名称一个长度
sheet.setDefaultColumnWidth((short)16);
// 生成一个样式
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中
style.setFont(font);
/********************* 数据单元格样式 **************************/
HSSFFont rowFont = wb.createFont();
rowFont.setFontName("宋体");
rowFont.setFontHeightInPoints((short)14);// 设置字体大小
// 给单子名称一个长度
sheet.setDefaultColumnWidth((short)16);
// 生成一个样式
HSSFCellStyle rowStyle = wb.createCellStyle();
rowStyle.setFont(rowFont);
// 样式字体居中
rowStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 创建第一行(也可以称为表头)
HSSFRow row = sheet.createRow(0);
row.setHeight((short)500);
// 给表头第一行一次创建单元格
for (short i = 0; i < headers.length; i++)
{
HSSFCell cell = row.createCell(i);
cell.setCellValue(headers[i]);
cell.setCellStyle(style);
}
// 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);
row.setHeight((short)500);
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++)
{
Field field = fields[i];
String fieldName = field.getName();
String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
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 && !"".equals(value))
{
textValue = value.toString();
}
if (textValue != null)
{
HSSFCell cell = row.createCell(i);
cell.setCellStyle(rowStyle);
cell.setCellValue(textValue);
}
}
}
java使用POI,以excel文件的形式,导出前端表格数据
标签:version lse etl 一句话 fir 工作薄 类型转换 转换 gen
原文地址:https://www.cnblogs.com/shuaifing/p/9184243.html