java导出EXCEL

Controller层

package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.service.UserSservice;
import com.example.demo.util.ExportExcel;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.util.List;

@Controller
public class ExportExcelContrller {

    @Autowired
    public UserSservice userSservice;

    @RequestMapping(value = "/exportdisTotal", method = RequestMethod.GET)
    public void ExportdisTotal(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ExportExcel<User> ex = new ExportExcel<User>();
        String title = "用户明细";
        OutputStream out = response.getOutputStream();
        String beginDate = request.getParameter("beginDate");
        String endDate = request.getParameter("endDate");
        List<User> userlist=userSservice.queryUser(null);

        String[] 标题={"序号","姓名","密码","年龄","性别","地址"};
        String[] 数据库列名={"id","name","password","age","sex","address"};
        ex.exportExcel(title,标题, userlist, out, "yyyy-MM-dd HH:mm:ss",
                数据库列名, "2019-7-11", "2019-8-11", response, "用户名");

    }
}

 方法类

package com.example.demo.util;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;

//import java.util.regex.Matcher;
//import java.util.regex.Pattern;

/**
 * 利用开源组件POI3.0.2动态导出EXCEL文档 转载时请保留以下信息，注明出处！
 * （现用POI版本3.9，根据云端行需求进行了修改,xml）
 * @author leno
 * @version v1.0
 * @param <T>
 *            应用泛型，代表任意一个符合javabean风格的类
 *            注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
 *            byte[]表jpg格式的图片数据
 */
public class ExportExcel<T> {
    /**
     * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
     *
     * @param title
     *            表格标题名
     * @param headers
     *            表格属性列名数组
     * @param dataset
     *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
     *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
     * @param out
     *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
     * @param pattern
     *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
     * @param userName
     */
    public void exportExcel(String title, String[] headers, Collection<T> dataset, OutputStream out, String pattern,
                            String[] items, String beginDate, String endDate, HttpServletResponse response, String userName) {
        // 声明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 生成一个表格
        HSSFSheet sheet = workbook.createSheet(title);
        // 设置表格默认列宽度为15个字节
        //		sheet.setDefaultColumnWidth((short)15);
        //标题样式
        HSSFCellStyle titleStyle = workbook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        HSSFFont titleFont = workbook.createFont();
        titleFont.setFontHeightInPoints((short) 20);
        titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        titleStyle.setFont(titleFont);

        // 生成一个样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置这些样式
        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        // 生成一个字体
        HSSFFont font = workbook.createFont();
        font.setColor(HSSFColor.VIOLET.index);
        font.setFontHeightInPoints((short) 12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //粗体
        // 把字体应用到当前的样式
        style.setFont(font);
        // 生成并设置另一个样式
        HSSFCellStyle style2 = workbook.createCellStyle();
        style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
        style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style2.setBorderTop(HSSFCellStyle.BORDER_NONE);
        style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        // 生成另一个字体
        HSSFFont font2 = workbook.createFont();
        font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        font2.setColor(HSSFColor.BLACK.index);
        // 把字体应用到当前的样式
        style2.setFont(font2);

        //第二行样式
        HSSFCellStyle secondStyle = workbook.createCellStyle();
        HSSFFont secondFont = workbook.createFont();
        secondFont.setFontHeightInPoints((short) 12);
        secondFont.setColor(HSSFColor.BLUE.index);
        secondFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        secondStyle.setFont(secondFont);

        //最后一行样式
        HSSFCellStyle lastStyle = workbook.createCellStyle();
        HSSFFont lastFont = workbook.createFont();
        lastFont.setColor(HSSFColor.BLACK.index);
        lastFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        lastStyle.setAlignment(HSSFCellStyle.ALIGN_RIGHT);
        lastStyle.setFont(lastFont);


        // 声明一个画图的顶级管理器
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        // 定义注释的大小和位置,详见文档
        HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
                0, 0, 0, (short) 4, 2, (short) 6, 5));
        // 设置注释内容
        comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
        // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
        comment.setAuthor("leno");

        //第一行
        HSSFRow row1 = sheet.createRow(0);
        HSSFCell cellTitle = row1.createCell(0);
        sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, (headers.length-1)));
        //设置该行样式
        cellTitle.setCellStyle(titleStyle);
        //设置该行值
        cellTitle.setCellValue(title);

//		第二行
        HSSFRow row2 = sheet.createRow(1);
        HSSFCell cellDate = row2.createCell(0);
        sheet.addMergedRegion(new CellRangeAddress(1, 1, 0, (headers.length-1)));
        cellDate.setCellStyle(secondStyle);
        cellDate.setCellValue("所属日期：" + beginDate + "至" + endDate);

        //第三行
        HSSFRow row3 = sheet.createRow(2);
        HSSFCell cell2 = row3.createCell(0);
        sheet.addMergedRegion(new CellRangeAddress(2, 2, 0, (headers.length-1)));
        String[] 明细={"打包时间","打包编号","出货子公司","账务中心","结算方式"};
        String[] 明细值={"20190712","000000000012","5100成都统一","51B5四川省财务中心","03赊账"};
        cell2.setCellStyle(style2);
        cell2.setCellValue("打包时间:20190712"+"     "+"打包编号:000000000012");

        //创建最后一行
        HSSFRow rowlast = sheet.createRow(4+dataset.size());
        HSSFCell celllast = rowlast.createCell(0);
        sheet.addMergedRegion(new CellRangeAddress(4+dataset.size(), 4+dataset.size(), 0, (headers.length-1)));
        celllast.setCellStyle(lastStyle);
        celllast.setCellValue("所属日期：20190712" );

        // 产生表格标题行
        HSSFRow row = sheet.createRow(3);
        for (int i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellStyle(style);
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
        }

        HSSFFont font3 = workbook.createFont();
        // 遍历集合数据，产生数据行
        Iterator<T> it = dataset.iterator();
        int index = 3;
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            T t = (T) it.next();
            for (int i = 0; i < items.length; i++) {
                HSSFCell cell = row.createCell(i);
                cell.setCellStyle(style2);
                String getMethodName = "get"
                        + items[i].substring(0, 1).toUpperCase()
                        + items[i].substring(1);
                try {
                    Class<? extends Object> 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;
                    if (value instanceof Boolean) {
                        boolean bValue = (Boolean) value;
                        textValue = "男";
                        if (!bValue) {
                            textValue = "女";
                        }
                    } else if (value instanceof Date) {
                        Date date = (Date) value;
                        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                        textValue = sdf.format(date);
                    } else if (value instanceof byte[]) {
                        // 有图片时，设置行高为60px;
                        row.setHeightInPoints(60);
                        // 设置图片所在列宽度为80px,注意这里单位的一个换算
                        sheet.setColumnWidth(i, (short) (35.7 * 80));
                        // sheet.autoSizeColumn(i);
                        byte[] bsValue = (byte[]) value;
                        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
                                1023, 255, (short) 6, index, (short) 6, index);
                        anchor.setAnchorType(2);
                        patriarch.createPicture(anchor, workbook.addPicture(
                                bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
                    } else if (value instanceof Integer) {
                        cell.setCellValue((int) value);
                    } else if (value instanceof BigDecimal) {
                        cell.setCellValue(((BigDecimal) value).doubleValue());
                    } else {
                        // 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) {
                        HSSFRichTextString richString = new HSSFRichTextString(textValue);
                        font3.setColor(HSSFColor.BLACK.index);
                        richString.applyFont(font3);
                        cell.setCellValue(richString);
                    }
					/*
					// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
					if (textValue != null) {
						Pattern p = Pattern.compile("^[0-9]+(.[0-9]{2})?$"); //两位小数的正实数
						Matcher matcher = p.matcher(textValue);
						if (matcher.matches()) {
							// 是数字当作double处理
							cell.setCellValue(Double.parseDouble(textValue));
						} else {
							HSSFRichTextString richString = new HSSFRichTextString(textValue);
							font3.setColor(HSSFColor.BLUE.index);
							richString.applyFont(font3);
							cell.setCellValue(richString);
						}
					}
					 */
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                } finally {
                    // 清理资源
                }
            }

        }

        //让列宽随着导出的列长自动适应
        for (int colNum = 0; colNum < headers.length; colNum++) {
            int columnWidth = sheet.getColumnWidth(colNum) / 256;
            for (int rowNum = 3; rowNum < sheet.getLastRowNum(); rowNum++) {
                HSSFRow currentRow;
                //当前行未被使用过
                if (sheet.getRow(rowNum) == null) {
                    currentRow = sheet.createRow(rowNum);
                } else {
                    currentRow = sheet.getRow(rowNum);
                }
                if (currentRow.getCell(colNum) != null) {
                    HSSFCell currentCell = currentRow.getCell(colNum);
                    if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                        int length = currentCell.getStringCellValue().getBytes().length;
                        if (columnWidth < length) {
                            columnWidth = length;
                        }
                    }
                }
            }
            if(colNum == 0){
                sheet.setColumnWidth(colNum, (columnWidth-2) * 256);
            }else{
                sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
            }
        }

        try {
            String fileName = userName + "-" + title + "-" + beginDate + "至" + endDate + ".xls";	//导出的文件名
//			String fileName = title + ".xls";	//导出的文件名
            response.setContentType("binary/octet-stream");
            response.setHeader("Content-Disposition", "attachment; filename=" + new String((fileName).getBytes("gb2312"),"iso8859-1"));
            workbook.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}