java使用POI，以excel文件的形式，导出前端表格数据

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);        }    }}

原文地址：https://www.cnblogs.com/shuaifing/p/9184243.html