POI导出Excel工具类，自动设置标题 列名 文件名，可插入图片，合并单元格

/** * Copyright &copy; 2012-2016 <a href="https://github.com/thinkgem/polysoft">polysoft</a> All rights reserved. */ package com.polysoft.common.utils.excel; import com.google.common.collect.Lists; import com.polysoft.common.utils.Reflections; import com.polysoft.common.utils.excel.annotation.ExcelField; import com.polysoft.modules.sys.utils.DictUtils; import org.apache.commons.collections.map.HashedMap; import org.apache.commons.lang3.StringUtils; import org.apache.poi.hssf.usermodel.HSSFClientAnchor; import org.apache.poi.hssf.usermodel.HSSFPatriarch; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.*; import org.apache.poi.ss.util.CellRangeAddress; import org.apache.poi.xssf.streaming.SXSSFWorkbook; import org.apache.poi.xssf.usermodel.XSSFClientAnchor; import org.apache.poi.xssf.usermodel.XSSFRichTextString; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.awt.image.BufferedImage; import java.io.*; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.net.URLEncoder; import java.util.*; /** * 导出Excel文件（导出“XLSX”格式，支持大数据量导出 @see org.apache.poi.ss.SpreadsheetVersion） * @author ThinkGem * @version 2013-04-21 */ public class ExportExcel { private static Logger log = LoggerFactory.getLogger(ExportExcel.class); /** * 工作薄对象 */ private SXSSFWorkbook wb; /** * 工作表对象 */ private Sheet sheet; /** * 样式列表 */ private Map<String, CellStyle> styles; /** * 当前行号 */ private int rownum; /** * 注解列表（Object[]{ ExcelField, Field/Method }） */ List<Object[]> annotationList = Lists.newArrayList(); /** * 构造函数 * @param title 表格标题，传“空值”，表示无标题 * @param cls 实体对象，通过annotation.ExportField获取标题 */ public ExportExcel(String title, Class<?> cls){ this(title, cls, 1); } /** * 构造函数 * @param title 表格标题，传“空值”，表示无标题 * @param cls 实体对象，通过annotation.ExportField获取标题 * @param type 导出类型（1:导出数据；2：导出模板） * @param groups 导入分组 */ public ExportExcel(String title, Class<?> cls, int type, int... groups){ // Get annotation field Field[] fs = cls.getDeclaredFields(); for (Field f : fs){ ExcelField ef = f.getAnnotation(ExcelField.class); if (ef != null && (ef.type()==0 || ef.type()==type)){ if (groups!=null && groups.length>0){ boolean inGroup = false; for (int g : groups){ if (inGroup){ break; } for (int efg : ef.groups()){ if (g == efg){ inGroup = true; annotationList.add(new Object[]{ef, f}); break; } } } }else{ annotationList.add(new Object[]{ef, f}); } } } // Get annotation method Method[] ms = cls.getDeclaredMethods(); for (Method m : ms){ ExcelField ef = m.getAnnotation(ExcelField.class); if (ef != null && (ef.type()==0 || ef.type()==type)){ if (groups!=null && groups.length>0){ boolean inGroup = false; for (int g : groups){ if (inGroup){ break; } for (int efg : ef.groups()){ if (g == efg){ inGroup = true; annotationList.add(new Object[]{ef, m}); break; } } } }else{ annotationList.add(new Object[]{ef, m}); } } } // Field sorting Collections.sort(annotationList, new Comparator<Object[]>() { public int compare(Object[] o1, Object[] o2) { return new Integer(((ExcelField)o1[0]).sort()).compareTo( new Integer(((ExcelField)o2[0]).sort())); }; }); // Initialize List<String> headerList = Lists.newArrayList(); for (Object[] os : annotationList){ String t = ((ExcelField)os[0]).title(); // 如果是导出，则去掉注释 if (type==1){ String[] ss = StringUtils.split(t, "**", 2); if (ss.length==2){ t = ss[0]; } } headerList.add(t); } initialize(title, headerList); } /** * 构造函数 * @param title 表格标题，传“空值”，表示无标题 * @param headers 表头数组 */ public ExportExcel(String title, String[] headers) { initialize(title, Lists.newArrayList(headers)); } /** * 构造函数 * @param title 表格标题，传“空值”，表示无标题 * @param headerList 表头列表 */ public ExportExcel(String title, List<String> headerList) { initialize(title, headerList); } /** * 初始化函数 * @param title 表格标题，传“空值”，表示无标题 * @param headerList 表头列表 */ private void initialize(String title, List<String> headerList) { this.wb = new SXSSFWorkbook(500); this.sheet = wb.createSheet("Export"); this.styles = createStyles(wb); // Create title if (StringUtils.isNotBlank(title)){ Row titleRow = sheet.createRow(rownum++); titleRow.setHeightInPoints(30); Cell titleCell = titleRow.createCell(0); titleCell.setCellStyle(styles.get("title")); titleCell.setCellValue(title); sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(), titleRow.getRowNum(), titleRow.getRowNum(), headerList.size()-1)); } // Create header if (headerList == null){ throw new RuntimeException("headerList not null!"); } Row headerRow = sheet.createRow(rownum++); headerRow.setHeightInPoints(16); for (int i = 0; i < headerList.size(); i++) { Cell cell = headerRow.createCell(i); cell.setCellStyle(styles.get("header")); String[] ss = StringUtils.split(headerList.get(i), "**", 2); if (ss.length==2){ cell.setCellValue(ss[0]); Comment comment = this.sheet.createDrawingPatriarch().createCellComment( new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6)); comment.setString(new XSSFRichTextString(ss[1])); cell.setCellComment(comment); }else{ cell.setCellValue(headerList.get(i)); } sheet.autoSizeColumn(i); } for (int i = 0; i < headerList.size(); i++) { int colWidth = sheet.getColumnWidth(i)*2; sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth); } log.debug("Initialize success."); } /** * 创建表格样式 * @param wb 工作薄对象 * @return 样式列表 */ private Map<String, CellStyle> createStyles(Workbook wb) { Map<String, CellStyle> styles = new HashMap<String, CellStyle>(); CellStyle style = wb.createCellStyle(); style.setAlignment(CellStyle.ALIGN_CENTER); style.setVerticalAlignment(CellStyle.VERTICAL_CENTER); Font titleFont = wb.createFont(); titleFont.setFontName("Arial"); titleFont.setFontHeightInPoints((short) 16); titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD); style.setFont(titleFont); styles.put("title", style); style = wb.createCellStyle(); style.setVerticalAlignment(CellStyle.VERTICAL_CENTER); style.setBorderRight(CellStyle.BORDER_THIN); style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex()); style.setBorderLeft(CellStyle.BORDER_THIN); style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex()); style.setBorderTop(CellStyle.BORDER_THIN); style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex()); style.setBorderBottom(CellStyle.BORDER_THIN); style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex()); Font dataFont = wb.createFont(); dataFont.setFontName("Arial"); dataFont.setFontHeightInPoints((short) 10); style.setFont(dataFont); st