java word - 2：POI开发流程

接上文，本章介绍下POI的开发流程

不同于Freemarker那样将模板和数据分离的方式，POI是没有模板的，模板和数据是糅合在一起的。

POI的开发流程其实网上教程都比较多了，我这边就将我写好的工具类贴在这里，大家自取

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.1.0</version>
</dependency><!-- poi处理xlsx格式,用于处理word中的表格 -->
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.1.0</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-excelant</artifactId><version>4.1.0</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>ooxml-schemas</artifactId><version>1.4</version>
</dependency>
<!-- poi-tl基于poi的word模板引擎 -->
<dependency><groupId>com.deepoove</groupId><artifactId>poi-tl</artifactId><version>1.5.0</version>
</dependency>
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><exclusions> <exclusion><groupId>ch.qos.logback</groupId><artifactId>*</artifactId></exclusion><exclusion><groupId>org.apache.logging.log4j</groupId><artifactId>*</artifactId></exclusion></exclusions>
</dependency>

package com.shr.service.inspect.util.word;import com.deepoove.poi.data.MiniTableRenderData;
import com.deepoove.poi.util.TableTools;
import com.shr.service.inspect.entity.task.word.BasicInfoEntity;
import com.shr.service.inspect.entity.task.word.ResultItemEntity;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFStyles;
import org.apache.poi.xwpf.usermodel.XWPFTable;
import org.apache.poi.xwpf.usermodel.XWPFTableRow;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTJc;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STHeightRule;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STJc;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STShd;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STTblWidth;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STVerticalJc;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;import java.io.File;
import java.io.FileOutputStream;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;@Component
@Slf4j
public class GeneratePoiWord {@Autowiredprivate DocUtil docUtil;private static final int TABLE_WIDTH = 13698;private static List<TableHeadEntity> pointTableColHeads = new ArrayList<>();private void initPointTableColHeads(){pointTableColHeads.add(TableHeadEntity.builder().title("序号").width(740).build());pointTableColHeads.add(TableHeadEntity.builder().title("点位名称").width(1058).build());pointTableColHeads.add(TableHeadEntity.builder().title("设备类型").width(1058).build());pointTableColHeads.add(TableHeadEntity.builder().title("设备部件").width(1058).build());pointTableColHeads.add(TableHeadEntity.builder().title("巡检时间").width(1058).build());pointTableColHeads.add(TableHeadEntity.builder().title("巡检结果").width(1058).build());pointTableColHeads.add(TableHeadEntity.builder().title("人工确认结果").width(1058).build());pointTableColHeads.add(TableHeadEntity.builder().title("巡检图片").width(5000).build());pointTableColHeads.add(TableHeadEntity.builder().title("审核状态").width(1058).build());}public void createWordDocument(Map<String, Object> root, File outFile){if (Objects.isNull(root)) {log.error("--- createWordDocument root is null");return;}log.info("--- createWordDocument start");// new 空白的文档XWPFDocument doc = new XWPFDocument();FileOutputStream out = null;try {initPointTableColHeads();out = new FileOutputStream(outFile);//将word排版设置成横向docUtil.setPageSize(doc, 16840, 11907);XWPFStyles newStyles = doc.createStyles();String firstTitle = "My Heading 1";docUtil.createHeadingStyle(newStyles, firstTitle, 1, 52, "000000", "楷体_GB2312");String secondTitle = "My Heading 2";docUtil.createHeadingStyle(newStyles, secondTitle, 1, 24, "000000", "楷体_GB2312");BasicInfoEntity basicInfo = (BasicInfoEntity) root.get("basicInfo");if (Objects.isNull(basicInfo)) {log.error("--- createWordDocument basicInfo is null");return;}docUtil.createFirstTitle(doc, firstTitle, basicInfo.getTitle(), true);docUtil.createSecondTitle(doc, secondTitle, "一、概述", true);createBaseInfoTable(doc, basicInfo);docUtil.createSecondTitle(doc, secondTitle, "二、异常点位结果", true);List<List<ResultItemEntity>> abnormalList = (List) root.get("abnormalList");if (CollectionUtils.isEmpty(abnormalList)) {docUtil.createContent(doc, "无", true);}else {int abnormalNum = (int) root.get("abnormalNum");creatTable(doc, abnormalList, abnormalNum);}docUtil.createSecondTitle(doc, secondTitle, "三、失败点位结果", true);List<List<ResultItemEntity>> failList = (List) root.get("failList");if (CollectionUtils.isEmpty(failList)) {docUtil.createContent(doc, "无", true);}else {int failNum = (int) root.get("failNum");creatTable(doc, failList, failNum);}docUtil.createSecondTitle(doc, secondTitle, "四、正常点位结果", true);List<List<ResultItemEntity>> normalList = (List) root.get("normalList");if (CollectionUtils.isEmpty(normalList)) {docUtil.createContent(doc, "无", true);}else {int normalNum = (int) root.get("normalNum");creatTable(doc, normalList, normalNum);}doc.write(out);out.close();} catch (Exception e) {log.error("-- CreateWordDocument error, {}", e.getMessage());} finally {try {if (Objects.nonNull(doc)) {doc.close();}if (Objects.nonNull(out)) {out.close();}} catch (Exception e1) {}}}private void createBaseInfoTable(XWPFDocument doc, BasicInfoEntity basicInfo){//创建一个表格，并指定宽度XWPFTable infoTable = doc.createTable(6, 4);TableTools.widthTable(infoTable, MiniTableRenderData.WIDTH_A4_FULL, 4);infoTable.getCTTbl().getTblPr().getTblW().setType(STTblWidth.DXA);infoTable.getCTTbl().getTblPr().getTblW().setW(BigInteger.valueOf(TABLE_WIDTH));CTJc ctJc = infoTable.getCTTbl().getTblPr().addNewJc();ctJc.setVal(STJc.CENTER);List<XWPFTableRow> rows = infoTable.getRows();for (int i = 0; i < rows.size(); i++) {XWPFTableRow row = rows.get(i);//设置每一行的高度和居中row.getCtRow().addNewTrPr().addNewTrHeight().setVal(BigInteger.valueOf(750));row.getCtRow().addNewTrPr().addNewTrHeight().setHRule(STHeightRule.AT_LEAST);row.getCtRow().addNewTrPr().addNewJc().setVal(STJc.CENTER);//设置每一列的宽度和居中row.getTableCells().get(0).getCTTc().addNewTcPr().addNewTcW().setType(STTblWidth.DXA);row.getTableCells().get(0).getCTTc().addNewTcPr().addNewTcW().setW(BigInteger.valueOf(2519));row.getTableCells().get(0).getCTTc().addNewTcPr().addNewVAlign().setVal(STVerticalJc.CENTER);//设置单元格背景颜色row.getTableCells().get(0).getCTTc().addNewTcPr().addNewShd().setVal(STShd.CLEAR);row.getTableCells().get(0).getCTTc().addNewTcPr().addNewShd().setColor("auto");row.getTableCells().get(0).getCTTc().addNewTcPr().addNewShd().setFill("C5E0B3");
//            row.getTableCells().get(0).getCTTc().addNewTcPr().addNewShd().setThemeFill(STThemeColor.ACCENT_6);
//            row.getTableCells().get(0).getCTTc().addNewTcPr().addNewShd().setThemeFillTint(intToByteArray(66));row.getTableCells().get(1).getCTTc().addNewTcPr().addNewTcW().setType(STTblWidth.DXA);row.getTableCells().get(1).getCTTc().addNewTcPr().addNewTcW().setW(BigInteger.valueOf(4126));row.getTableCells().get(1).getCTTc().addNewTcPr().addNewVAlign().setVal(STVerticalJc.CENTER);row.getTableCells().get(2).getCTTc().addNewTcPr().addNewTcW().setType(STTblWidth.DXA);row.getTableCells().get(2).getCTTc().addNewTcPr().addNewTcW().setW(BigInteger.valueOf(2407));row.getTableCells().get(2).getCTTc().addNewTcPr().addNewVAlign().setVal(STVerticalJc.CENTER);row.getTableCells().get(2).getCTTc().addNewTcPr().addNewShd().setVal(STShd.CLEAR);row.getTableCells().get(2).getCTTc().addNewTcPr().addNewShd().setColor("auto");row.getTableCells().get(2).getCTTc().addNewTcPr().addNewShd().setFill("C5E0B3");
//            row.getTableCells().get(2).getCTTc().addNewTcPr().addNewShd().setThemeFill(STThemeColor.ACCENT_6);
//            row.getTableCells().get(2).getCTTc().addNewTcPr().addNewShd().setThemeFillTint(intToByteArray(66));row.getTableCells().get(3).getCTTc().addNewTcPr().addNewTcW().setType(STTblWidth.DXA);row.getTableCells().get(3).getCTTc().addNewTcPr().addNewTcW().setW(BigInteger.valueOf(4646));row.getTableCells().get(3).getCTTc().addNewTcPr().addNewVAlign().setVal(STVerticalJc.CENTER);}//将表格的单元格进行合并：从第六行的第二列到第四列进行合并；合并后的单元格，算做此行的第二列docUtil.mergeCellsHorizontal(infoTable, 5, 1, 3);//设置第1行数据docUtil.setTableCell(rows.get(0).getTableCells().get(0), "变电站");docUtil.setTableCell(rows.get(0).getTableCells().get(1), basicInfo.getUnit());docUtil.setTableCell(rows.get(0).getTableCells().get(2), "任务名称");docUtil.setTableCell(rows.get(0).getTableCells().get(3), basicInfo.getTaskName());//设置第2行数据docUtil.setTableCell(rows.get(1).getTableCells().get(0), "开始时间");docUtil.setTableCell(rows.get(1).getTableCells().get(1), basicInfo.getTaskStartTime());docUtil.setTableCell(rows.get(1).getTableCells().get(2), "结束时间");docUtil.setTableCell(rows.get(1).getTableCells().get(3), basicInfo.getTaskEndTime());//设置第3行数据docUtil.setTableCell(rows.get(2).getTableCells().get(0), "审核人员");docUtil.setTableCell(rows.get(2).getTableCells().get(1), basicInfo.getAuditor());docUtil.setTableCell(rows.get(2).getTableCells().get(2), "审核时间");docUtil.setTableCell(rows.get(2).getTableCells().get(3), basicInfo.getAuditTime());//设置第4行数据docUtil.setTableCell(rows.get(3).getTableCells().get(0), "任务巡视点总数");docUtil.setTableCell(rows.get(3).getTableCells().get(1), basicInfo.getPointTotal() + "");docUtil.setTableCell(rows.get(3).getTableCells().get(2), "正常巡视点数");docUtil.setTableCell(rows.get(3).getTableCells().get(3), basicInfo.getNormalNum() + "");//设置第5行数据docUtil.setTableCell(rows.get(4).getTableCells().get(0), "告警巡视点数");docUtil.setTableCell(rows.get(4).getTableCells().get(1), basicInfo.getAlarmNum() + "");docUtil.setTableCell(rows.get(4).getTableCells().get(2), "失败巡视点数");docUtil.setTableCell(rows.get(4).getTableCells().get(3), basicInfo.getFailNum() + "");//设置第5行数据docUtil.setTableCell(rows.get(5).getTableCells().get(0), "当前天气");docUtil.setTableCell(rows.get(5).getTableCells().get(1), basicInfo.getMicroclimateData());}private void creatTable(XWPFDocument doc, List<List<ResultItemEntity>> listList, int rowsCount){int colCount = 9;  //列数
//        File file = new File("E:\\11\\image\\pre_image");//File类型可以是文件也可以是文件夹
//        File[] files = file.listFiles();
//        rowsCount = 3000;//行数XWPFTable infoTable = doc.createTable(rowsCount + 1, colCount);TableTools.widthTable(infoTable, MiniTableRenderData.WIDTH_A4_FULL, 4);infoTable.getCTTbl().getTblPr().getTblW().setType(STTblWidth.DXA);infoTable.getCTTbl().getTblPr().getTblW().setW(BigInteger.valueOf(TABLE_WIDTH));CTJc ctJc1 = infoTable.getCTTbl().getTblPr().addNewJc();ctJc1.setVal(STJc.CENTER);List<XWPFTableRow> rows = infoTable.getRows();XWPFTableRow firstRow = rows.get(0);for (int w = 0; w < pointTableColHeads.size(); w++) {TableHeadEntity tableHeadEntity = pointTableColHeads.get(w);firstRow.getTableCells().get(w).getCTTc().addNewTcPr().addNewTcW().setType(STTblWidth.DXA);firstRow.getTableCells().get(w).getCTTc().addNewTcPr().addNewTcW().setW(BigInteger.valueOf(tableHeadEntity.getWidth()));firstRow.getTableCells().get(w).getCTTc().addNewTcPr().addNewVAlign().setVal(STVerticalJc.CENTER);firstRow.getCtRow().addNewTrPr().addNewTrHeight().setVal(BigInteger.valueOf(750));firstRow.getCtRow().addNewTrPr().addNewTrHeight().setHRule(STHeightRule.AT_LEAST);firstRow.getCtRow().addNewTrPr().addNewJc().setVal(STJc.CENTER);docUtil.setPointTableCell(firstRow.getTableCells().get(w), tableHeadEntity.getTitle(), true);}int currentRow = 0;int fromRow = 1;for (List<ResultItemEntity> list : listList) {int toRow = fromRow + list.size();docUtil.mergeCellsVertically(infoTable, 0, fromRow, toRow);docUtil.mergeCellsVertically(infoTable, 1, fromRow, toRow);docUtil.mergeCellsVertically(infoTable, 2, fromRow, toRow);docUtil.mergeCellsVertically(infoTable, 3, fromRow, toRow);docUtil.mergeCellsVertically(infoTable, 4, fromRow, toRow);fromRow = toRow;for (ResultItemEntity resultItemEntity : list) {currentRow++;log.info("----" + currentRow);XWPFTableRow row = rows.get(currentRow);row.getCtRow().addNewTrPr().addNewTrHeight().setVal(BigInteger.valueOf(750));row.getCtRow().addNewTrPr().addNewTrHeight().setHRule(STHeightRule.AT_LEAST);row.getCtRow().addNewTrPr().addNewJc().setVal(STJc.CENTER);docUtil.setPointTableCell(row.getTableCells().get(0), resultItemEntity.getIndex(), false);docUtil.setPointTableCell(row.getTableCells().get(1), resultItemEntity.getPointName(), false);docUtil.setPointTableCell(row.getTableCells().get(2), resultItemEntity.getDeviceType(), false);docUtil.setPointTableCell(row.getTableCells().get(3), resultItemEntity.getComponentName(), false);docUtil.setPointTableCell(row.getTableCells().get(4), resultItemEntity.getExecuteTime(), false);docUtil.setPointTableCell(row.getTableCells().get(5), resultItemEntity.getTaskResult(), false);docUtil.setPointTableCell(row.getTableCells().get(6), resultItemEntity.getManualConfirmResult(), false);docUtil.setCellImage(row.getTableCells().get(7), resultItemEntity.getImageUrl());docUtil.setPointTableCell(row.getTableCells().get(8), resultItemEntity.getAuditStatus(), false);}}}
}

package com.shr.service.inspect.util.word;import com.shr.service.inspect.entity.common.ConstantInterface;
import com.shr.service.inspect.util.file.FileManager;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.util.Units;
import org.apache.poi.xwpf.usermodel.ParagraphAlignment;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import org.apache.poi.xwpf.usermodel.XWPFStyle;
import org.apache.poi.xwpf.usermodel.XWPFStyles;
import org.apache.poi.xwpf.usermodel.XWPFTable;
import org.apache.poi.xwpf.usermodel.XWPFTableCell;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTColor;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTDecimalNumber;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTFonts;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTHpsMeasure;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTOnOff;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTP;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTPPr;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTPageSz;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTRPr;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTSectPr;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTString;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTStyle;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTVMerge;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STMerge;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STPageOrientation;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STStyleType;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STVerticalJc;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;import javax.xml.bind.annotation.adapters.HexBinaryAdapter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.util.List;
import java.util.Objects;
import java.util.UUID;@Component
@Slf4j
public class DocUtil {@Autowiredprivate FileManager fileManager;/*** 设置纸张大小** @param document doc对象* @param width    宽* @param height   长*/public void setPageSize(XWPFDocument document, long width, long height){CTSectPr sectPr = document.getDocument().getBody().addNewSectPr();CTPageSz pgsz = sectPr.isSetPgSz() ? sectPr.getPgSz() : sectPr.addNewPgSz();pgsz.setW(BigInteger.valueOf(width));pgsz.setH(BigInteger.valueOf(height));pgsz.setOrient(STPageOrientation.LANDSCAPE);}/*** @param styles* @param strStyleId   标题id* @param headingLevel 标题级别* @param pointSize    字体大小（/2）* @param hexColor     字体颜色* @param typefaceName 字体名称（默认宋体）*/public void createHeadingStyle(XWPFStyles styles, String strStyleId, int headingLevel, int pointSize, String hexColor, String typefaceName){//创建样式CTStyle ctStyle = CTStyle.Factory.newInstance();//设置idctStyle.setStyleId(strStyleId);CTString styleName = CTString.Factory.newInstance();styleName.setVal(strStyleId);ctStyle.setName(styleName);CTDecimalNumber indentNumber = CTDecimalNumber.Factory.newInstance();indentNumber.setVal(BigInteger.valueOf(headingLevel));// 数字越低在格式栏中越突出ctStyle.setUiPriority(indentNumber);CTOnOff onoffnull = CTOnOff.Factory.newInstance();ctStyle.setUnhideWhenUsed(onoffnull);// 样式将显示在“格式”栏中ctStyle.setQFormat(onoffnull);// 样式定义给定级别的标题CTPPr ppr = CTPPr.Factory.newInstance();ppr.setOutlineLvl(indentNumber);ctStyle.setPPr(ppr);XWPFStyle style = new XWPFStyle(ctStyle);CTHpsMeasure size = CTHpsMeasure.Factory.newInstance();size.setVal(new BigInteger(String.valueOf(pointSize)));CTHpsMeasure size2 = CTHpsMeasure.Factory.newInstance();size2.setVal(new BigInteger(String.valueOf(pointSize)));CTFonts fonts = CTFonts.Factory.newInstance();if (typefaceName == null || typefaceName.equals("")) {typefaceName = "宋体";}fonts.setAscii(typefaceName);    //字体fonts.setEastAsia(typefaceName); //中文字体CTRPr rpr = CTRPr.Factory.newInstance();rpr.setRFonts(fonts);rpr.setSz(size);rpr.setSzCs(size2);    //字体大小CTColor color = CTColor.Factory.newInstance();color.setVal(hexToBytes(hexColor));rpr.setColor(color);    //字体颜色style.getCTStyle().setRPr(rpr);// is a null op if already definedstyle.setType(STStyleType.PARAGRAPH);styles.addStyle(style);}public static byte[] hexToBytes(String hexString){HexBinaryAdapter adapter = new HexBinaryAdapter();byte[] bytes = adapter.unmarshal(hexString);return bytes;}public void setTableCell(XWPFTableCell cell01, String text){int fontSize = 11;String fontFamily = "楷体_GB2312";ParagraphAlignment alignment = ParagraphAlignment.LEFT;boolean isBold = false;CTP ctP = (cell01.getCTTc().sizeOfPArray() == 0) ? cell01.getCTTc().addNewP() : cell01.getCTTc().getPArray(0);XWPFParagraph p = cell01.getParagraph(ctP);XWPFRun headRun0 = p.createRun();headRun0.setText("  " + text);headRun0.setFontSize(fontSize);p.setAlignment(alignment);headRun0.setFontFamily(fontFamily);headRun0.setBold(isBold);//是否粗体}public void setPointTableCell(XWPFTableCell cell01, String text, boolean isBold){int fontSize = 9;String fontFamily = "宋体 (正文)";ParagraphAlignment alignment = ParagraphAlignment.CENTER;CTP ctP = (cell01.getCTTc().sizeOfPArray() == 0) ? cell01.getCTTc().addNewP() : cell01.getCTTc().getPArray(0);//单元格内容垂直居中cell01.getCTTc().addNewTcPr().addNewVAlign().setVal(STVerticalJc.CENTER);XWPFParagraph p = cell01.getParagraph(ctP);XWPFRun headRun0 = p.createRun();headRun0.setText(text);headRun0.setFontSize(fontSize);p.setAlignment(alignment);headRun0.setFontFamily(fontFamily);headRun0.setBold(isBold);//是否粗体}/*** 合并单元格** @param table         表格对象* @param beginRowIndex 开始行索引* @param endRowIndex   结束行索引* @param colIndex      合并列索引*/public void mergeRowCell(XWPFTable table, int beginRowIndex, int endRowIndex, int colIndex){try {if (beginRowIndex == endRowIndex || beginRowIndex > endRowIndex) {return;}//合并行单元格的第一个单元格CTVMerge startMerge = CTVMerge.Factory.newInstance();startMerge.setVal(STMerge.RESTART);//合并行单元格的第一个单元格之后的单元格CTVMerge endMerge = CTVMerge.Factory.newInstance();endMerge.setVal(STMerge.CONTINUE);table.getRow(beginRowIndex).getCell(colIndex).getCTTc().getTcPr().setVMerge(startMerge);for (int i = beginRowIndex + 1; i <= endRowIndex; i++) {table.getRow(i).getCell(colIndex).getCTTc().getTcPr().setVMerge(endMerge);}} catch (Exception e) {log.error("-- mergeRowCell error, {}", e.getMessage());}}/*** word跨列合并单元格* table 表单对象* row  合并行* fromCell 起始列* toCell  结束列*/public void mergeCellsHorizontal(XWPFTable table, Integer row, Integer fromCell, Integer toCell){try {for (int cellIndex = fromCell; cellIndex <= toCell; cellIndex++) {XWPFTableCell cell = table.getRow(row).getCell(cellIndex);if (cellIndex == fromCell) {// The first merged cell is set with RESTART merge valuecell.getCTTc().addNewTcPr().addNewHMerge().setVal(STMerge.RESTART);}else {// Cells which join (merge) the first one, are set with CONTINUEcell.getCTTc().addNewTcPr().addNewHMerge().setVal(STMerge.CONTINUE);}}} catch (Exception e) {log.error("--- mergeCellsHorizontal error, {}", e.getMessage());}}/*** 跨行合并单元格** @param table   表单对象* @param col     合并列* @param fromRow 起始行* @param toRow   结束行*/public void mergeCellsVertically(XWPFTable table, Integer col, Integer fromRow, Integer toRow){try {for (int rowIndex = fromRow; rowIndex < toRow; rowIndex++) {XWPFTableCell cell = table.getRow(rowIndex).getCell(col);if (rowIndex == fromRow) {// The first merged cell is set with RESTART merge valuecell.getCTTc().addNewTcPr().addNewVMerge().setVal(STMerge.RESTART);}else {// Cells which join (merge) the first one, are set with CONTINUEcell.getCTTc().addNewTcPr().addNewVMerge().setVal(STMerge.CONTINUE);}}} catch (Exception e) {log.error("--- mergeCellsVertically error, {}", e.getMessage());}}/*** 设置一级标题** @param doc* @param secondTitle* @param title* @param isBold*/public void createFirstTitle(XWPFDocument doc, String secondTitle, String title, boolean isBold){try {XWPFParagraph para = doc.createParagraph();para.setAlignment(ParagraphAlignment.CENTER); //标题设置水平居中para.setStyle(secondTitle);XWPFRun run2 = para.createRun();run2.setText(title);run2.setBold(isBold);} catch (Exception e) {log.error("--- createFirstTitle error, {}", e.getMessage());}}/*** 设置二级标题** @param doc* @param secondTitle* @param title* @param isBold*/public void createSecondTitle(XWPFDocument doc, String secondTitle, String title, boolean isBold){try {XWPFParagraph para = doc.createParagraph();para.createRun().addBreak();para.setStyle(secondTitle);XWPFRun run2 = para.createRun();run2.setText(title);run2.setBold(isBold);} catch (Exception e) {log.error("--- createSecondTitle error, {}", e.getMessage());}}/*** 设置正文** @param doc* @param title* @param isBold*/public void createContent(XWPFDocument doc, String title, boolean isBold){try {XWPFParagraph para = doc.createParagraph();para.createRun().addBreak();XWPFRun run2 = para.createRun();run2.setText(title);run2.setBold(isBold);run2.setFontFamily("楷体_GB2312");} catch (Exception e) {log.error("--- createSecondTitle error, {}", e.getMessage());}}private void copyFileUsingFileStreams(File source, File dest)throws IOException{InputStream input = null;OutputStream output = null;try {input = new FileInputStream(source);output = new FileOutputStream(dest);byte[] buf = new byte[1024];int bytesRead;while ((bytesRead = input.read(buf)) > 0) {output.write(buf, 0, bytesRead);}} finally {input.close();output.close();}}/*** 单元格写入图片** @param cell* @param url* @throws IOException*/public void setCellImage(XWPFTableCell cell, String url){InputStream in = null;try {List<XWPFParagraph> paragraphs = cell.getParagraphs();XWPFParagraph newPara = paragraphs.get(0);XWPFRun imageCellRunn = newPara.createRun();newPara.setAlignment(ParagraphAlignment.CENTER);String newFileName = UUID.randomUUID().toString();File newFile = File.createTempFile(newFileName, ConstantInterface.PNG_SUFFIX);if (StringUtils.isBlank(url) || url.split(ConstantInterface.SPACE_SEPARATOR).length != 2) {return;}String[] split = url.split(ConstantInterface.SPACE_SEPARATOR);String fileName = split[1];in = fileManager.getFile(split[0], fileName);int format;if (url.endsWith(".emf")) {format = XWPFDocument.PICTURE_TYPE_EMF;}else if (url.endsWith(".wmf")) {format = XWPFDocument.PICTURE_TYPE_WMF;}else if (url.endsWith(".pict")) {format = XWPFDocument.PICTURE_TYPE_PICT;}else if (url.endsWith(".jpeg") || url.endsWith(".jpg")) {format = XWPFDocument.PICTURE_TYPE_JPEG;}else if (url.endsWith(".png")) {format = XWPFDocument.PICTURE_TYPE_PNG;}else if (url.endsWith(".dib")) {format = XWPFDocument.PICTURE_TYPE_DIB;}else if (url.endsWith(".gif")) {format = XWPFDocument.PICTURE_TYPE_GIF;}else if (url.endsWith(".tiff")) {format = XWPFDocument.PICTURE_TYPE_TIFF;}else if (url.endsWith(".eps")) {format = XWPFDocument.PICTURE_TYPE_EPS;}else if (url.endsWith(".bmp")) {format = XWPFDocument.PICTURE_TYPE_BMP;}else if (url.endsWith(".wpg")) {format = XWPFDocument.PICTURE_TYPE_WPG;}else {log.error("Unsupported picture: " + url + ". Expected emf|wmf|pict|jpeg|png|dib|gif|tiff|eps|bmp|wpg");return;}imageCellRunn.addPicture(in, format, newFile.getName(), Units.toEMU(200), Units.toEMU(200)); // 200x200 pixels} catch (Exception e) {log.error("--- setCellImage error, {}", e.getMessage());} finally {try {if (Objects.nonNull(in)) {in.close();}} catch (Exception e1) {}}}/*** 单元格写入图片** @param cell* @param file*/public void setCellImageFromFile(XWPFTableCell cell, File file){try {List<XWPFParagraph> paragraphs = cell.getParagraphs();XWPFParagraph newPara = paragraphs.get(0);XWPFRun imageCellRunn = newPara.createRun();newPara.setAlignment(ParagraphAlignment.CENTER);if (!file.exists()) {return;}String url = file.getPath();int format;if (url.endsWith(".emf")) {format = XWPFDocument.PICTURE_TYPE_EMF;}else if (url.endsWith(".wmf")) {format = XWPFDocument.PICTURE_TYPE_WMF;}else if (url.endsWith(".pict")) {format = XWPFDocument.PICTURE_TYPE_PICT;}else if (url.endsWith(".jpeg") || url.endsWith(".jpg")) {format = XWPFDocument.PICTURE_TYPE_JPEG;}else if (url.endsWith(".png")) {format = XWPFDocument.PICTURE_TYPE_PNG;}else if (url.endsWith(".dib")) {format = XWPFDocument.PICTURE_TYPE_DIB;}else if (url.endsWith(".gif")) {format = XWPFDocument.PICTURE_TYPE_GIF;}else if (url.endsWith(".tiff")) {format = XWPFDocument.PICTURE_TYPE_TIFF;}else if (url.endsWith(".eps")) {format = XWPFDocument.PICTURE_TYPE_EPS;}else if (url.endsWith(".bmp")) {format = XWPFDocument.PICTURE_TYPE_BMP;}else if (url.endsWith(".wpg")) {format = XWPFDocument.PICTURE_TYPE_WPG;}else {log.error("Unsupported picture: " + url + ". Expected emf|wmf|pict|jpeg|png|dib|gif|tiff|eps|bmp|wpg");return;}FileInputStream is = new FileInputStream(url);imageCellRunn.addPicture(is, format, file.getName(), Units.toEMU(200), Units.toEMU(200)); // 200x200 pixels} catch (Exception e) {log.error("--- setCellImageFromFile error, {}", e.getMessage());}}
}

我总结下POI的优缺点：

先说缺点：

1.需要把数据和模板糅合在一起，两者强关联；

2.POI的文档效果不像Freemarker那么方便，一些单元格合并、单元格底色、页边距这些，都要自己在代码里写死，如果要二次修改，就需要自己在代码里进行修改，查看效果也要通过重复生成新文件来验证，很不方便。

优点：

1.文件小！打开快！这是POI的最大的优势！我做过实验，发现，如果我重复插入相同的图片，POI自身会做优化，生成的文件解析成xml后发现，它会把相同的图片只保存一份，哪怕图片来源于不同的文件，它也会只保存一份，这是非常恐怖的。

下图里，文件名里的数字代表的是塞入的相同图片数量，可以看到，在单张图片size是591KB的情况下，1000张图片的文件是645K，2000张图片是701K，3000张图片是758K，文件大小几乎没有增长。这对于特殊场景的需求，还是有很大优化的。

下图是塞入不同图片的情况，可以看到生成的文件大小也非常的小，而且打开速度也很快。

对于使用Freemarker生成的文件，动辄300M的，多则800M的情况，这是一个很大的优化！

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