Excel导出及多sheet导出

maven相关依赖

        
			org.apache.poi
			poi
			3.9
		
		
			org.apache.poi
			poi-ooxml
			3.9
		
		
			org.apache.poi
			poi-ooxml-schemas
			3.9
		

具体代码：

package com.senqiangsoft.shineiot.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.FileUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
/**
 * Excel 相关操作类(小数据量写入<=65536)
 */
public class ExcelUtils {

    private static final int DEFAULT_COLUMN_SIZE = 30;

    /**
     * 断言Excel文件写入之前的条件
     *
     * @param directory 目录
     * @param fileName  文件名
     * @return file
     * @throws IOException
     */
    private static File assertFile(String directory, String fileName) throws IOException {
        //File tmpFile = new File(directory + File.separator + fileName + ".xls");
        /*if (tmpFile.exists()) {
            if (tmpFile.isDirectory()) {
                throw new IOException("File '" + tmpFile + "' exists but is a directory");
            }
            if (!tmpFile.canWrite()) {
                throw new IOException("File '" + tmpFile + "' cannot be written to");
            }
        } else {
            File parent = tmpFile.getParentFile();
            if (parent != null) {
                if (!parent.mkdirs() && !parent.isDirectory()) {
                    throw new IOException("Directory '" + parent + "' could not be created");
                }
            }
        }*/
       // return tmpFile;
    	File file=null;
    	if(directory!=null&&fileName!=null) {
    		file=new File(directory,fileName);
    		File parentFile=file.getParentFile();
    		if(!parentFile.exists()) {
    			parentFile.mkdirs();
    		}
    	}
    	return file;
    }
    
    public File savePath() {
    	String savaPath="D://repertoryDownLoad";
    	Date now =new Date();
    	File file=new File(savaPath,now.getTime()+".xls");
    	if(!file.getParentFile().exists()) {//如果顶级目录不存在
    		file.mkdirs();
    	}
    	if(file.exists()) {
    		try {
				file.createNewFile();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
        return file;
    }

    /**
     * 日期转化为字符串,格式为yyyy-MM-dd HH:mm:ss
     */
    private static String getCnDate(Date date) {
        String format = "yyyy-MM-dd HH:mm:ss";
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(date);
    }

    /**
     * Excel 导出，POI实现
     *
     * @param fileName    文件名
     * @param sheetName   sheet页名称
     * @param columnNames 表头列表名
     * @param sheetTitle  sheet页Title
     * @param objects     目标数据集
     */
    public static File writeExcel(String directory, String fileName, String sheetName, List columnNames,
                                  String sheetTitle, List> objects, boolean append) throws Exception {
        File tmpFile = assertFile(directory, fileName);
        return exportExcel(tmpFile, sheetName, columnNames, sheetTitle, objects, append);
    }

    /**
     * Excel 导出，POI实现，先写入Excel标题，与writeExcelData配合使用
     * 先使用writeExcelTitle再使用writeExcelData
     *
     * @param directory   目录
     * @param fileName    文件名
     * @param sheetName   sheetName
     * @param columnNames 列名集合
     * @param sheetTitle  表格标题
     * @param append      是否在现有的文件追加
     * @return file
     * @throws IOException
     */
    public static File writeExcelTitle(String directory, String fileName, String sheetName, List columnNames,
                                       String sheetTitle, boolean append) throws Exception {
        File tmpFile = assertFile(directory, fileName);
        return exportExcelTitle(tmpFile, sheetName, columnNames, sheetTitle, append);
    }

    /**
     * Excel 导出，POI实现，写入Excel数据行列，与writeExcelTitle配合使用
     * 先使用writeExcelTitle再使用writeExcelData
     *
     * @param directory 目录
     * @param fileName  文件名
     * @param sheetName sheetName
     * @param objects   数据信息
     * @return file
     * @throws IOException
     */
    public static File writeExcelData(String directory, String fileName, String sheetName, List> objects)
            throws Exception {
        File tmpFile = assertFile(directory, fileName);
        return exportExcelData(tmpFile, sheetName, objects);
    }

    /**
     * 导出字符串数据
     *
     * @param file        文件名
     * @param columnNames 表头
     * @param sheetTitle  sheet页Title
     * @param append      是否追加写文件
     * @return file
     */
    private static File exportExcelTitle(File file, String sheetName, List columnNames,
                                         String sheetTitle, boolean append) throws Exception {
        // 声明一个工作薄
        Workbook workBook;
        if (file.exists() && append) {
            // 声明一个工作薄
            workBook = new HSSFWorkbook(new FileInputStream(file));
        } else {
            workBook = new HSSFWorkbook();
        }
        Map cellStyleMap = styleMap(workBook);
        // 表头样式
        CellStyle headStyle = cellStyleMap.get("head");
        // 生成一个表格
        Sheet sheet = workBook.getSheet(sheetName);
        if (sheet == null) {
            sheet = workBook.createSheet(sheetName);
        }
        //最新Excel列索引,从0开始
        int lastRowIndex = sheet.getLastRowNum();
        if (lastRowIndex > 0) {
            lastRowIndex++;
        }
        // 设置表格默认列宽度
        sheet.setDefaultColumnWidth(DEFAULT_COLUMN_SIZE);
        // 合并单元格
        sheet.addMergedRegion(new CellRangeAddress(lastRowIndex, lastRowIndex, 0, columnNames.size() - 1));
        // 产生表格标题行
        Row rowMerged = sheet.createRow(lastRowIndex);
        lastRowIndex++;
        Cell mergedCell = rowMerged.createCell(0);
        mergedCell.setCellStyle(headStyle);
        mergedCell.setCellValue(new HSSFRichTextString(sheetTitle));
        // 产生表格表头列标题行
        Row row = sheet.createRow(lastRowIndex);
        for (int i = 0; i < columnNames.size(); i++) {
            Cell cell = row.createCell(i);
            cell.setCellStyle(headStyle);
            RichTextString text = new HSSFRichTextString(columnNames.get(i));
            cell.setCellValue(text);
        }
        try {
            OutputStream ops = new FileOutputStream(file);
            workBook.write(ops);
            ops.flush();
            ops.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return file;
    }

    /**
     * 导出字符串数据
     *
     * @param file    文件名
     * @param objects 目标数据
     * @return
     */
    private static File exportExcelData(File file, String sheetName, List> objects) throws Exception {
        // 声明一个工作薄
        Workbook workBook;
        if (file.exists()) {
            // 声明一个工作薄
            workBook = new HSSFWorkbook(new FileInputStream(file));
        } else {
            workBook = new HSSFWorkbook();
        }
        Map cellStyleMap = styleMap(workBook);
        // 正文样式
        CellStyle contentStyle = cellStyleMap.get("content");
        //正文整数样式
        CellStyle contentIntegerStyle = cellStyleMap.get("integer");
        //正文带小数整数样式
        CellStyle contentDoubleStyle = cellStyleMap.get("double");
        // 生成一个表格
        Sheet sheet = workBook.getSheet(sheetName);
        if (sheet == null) {
            sheet = workBook.createSheet(sheetName);
        }
        //最新Excel列索引,从0开始
        int lastRowIndex = sheet.getLastRowNum();
        if (lastRowIndex > 0) {
            lastRowIndex++;
        }
        // 设置表格默认列宽度
        sheet.setDefaultColumnWidth(DEFAULT_COLUMN_SIZE);
        // 遍历集合数据,产生数据行,前两行为标题行与表头行
        for (List