ITEXT 表格的指定列合并-升级版

问题场景

今天在review代码的时候，发现对于ITEXT 表格的指定列合并还可以升级下，支持重复的字段出现合并。

比较

ITEXT 表格的指定列合并-升级版：方法简单，且支持 ‘A,A,B,C,A,D,D,D,E’，即字符串A可以重复不间断出现；
ITEXT 表格的指定列合并：方法略微复杂，且不支持 ‘A,A,B,C,A,D,D,D,E’，只支持 ‘A,A,B,C,D,D,D,E’，即字符串如果有重复的只能连续出现在一起。

CODE

需要导入的包：itext-pdfa-5.5.6.jar、itext-xtra-5.5.6.jar、itext-5.5.6.jar、itext-asian.jar

package itext.a14;import com.itextpdf.text.*;import com.itextpdf.text.pdf.BaseFont;import com.itextpdf.text.pdf.PdfPCell;import com.itextpdf.text.pdf.PdfPTable;import com.itextpdf.text.pdf.PdfWriter;import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;/** * Created on 2017/8/15 * Author: youxingyang. */public class A14 {    public static String split = "<brb>";    public static void main(String[] args) {        Document document = new Document(PageSize.A4, 48, 48, 60, 65);        try {            PdfWriter pdfWriter = PdfWriter.getInstance(document, new FileOutputStream("A14.pdf"));            document.open();            // 设置字体            BaseFont bfCN = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", false);            // 正文的字体            Font headFont = new Font(bfCN, 12f, Font.BOLD, BaseColor.ORANGE);            Font textFont = new Font(bfCN, 12f, Font.NORMAL, BaseColor.BLUE);            //添加测试数据            List<String[]> list = new ArrayList<>();            for (int i = 0; i < 24; i++) {                String[] arr = new String[4];                String value;                if (i < 4) {                    value = "A";                } else if (i >= 4 && i < 6) {                    value = "B";                } else if (i >= 6 && i < 8) {                    value = "C";                } else if (i >= 8 && i < 13) {                    value = "D";                } else if (i == 13 || i == 14) {                    value = "A";                } else if (i > 14 && i < 16) {                    value = "E";                } else if (i == 17) {                    value = "F";                } else {                    value = "G";                }                arr[0] = "0" + i;                arr[1] = value;                arr[2] = "2" + i;                arr[3] = "3" + i;                list.add(arr);            }            //复制要合并的列            List<String> ListIn = new ArrayList<>();            for (String[] aList : list) {                ListIn.add(aList[1]);            }            //根据算法改变合并列的值            List<String> changeList = changeList(ListIn);            //改变该列后把它复制到原来的list            for (int i = 0; i < changeList.size(); i++) {                String[] arr = list.get(i);                arr[1] = changeList.get(i);                list.set(i, arr);            }            document.newPage();            //建立一个4列的表格            PdfPTable table = new PdfPTable(4);            String[] titleArr = {"第1列", "合并列", "第3列", "第4列"};            //加表格头部            addTitle1(table, titleArr, headFont);            //加表格内容            addContent1(table, list, textFont);            document.add(table);            document.close();        } catch (DocumentException | IOException e){            e.printStackTrace();        }    }    private static void addContent1(PdfPTable table, List<String[]> list, Font textFont) {        //表格数据内容        for (String[] str : list) {            for (int j = 0; j < str.length; j++) {                String value = str[j];                if (value != null) {                    Paragraph paragraph01;                    int spanNum = 1;                    if (j == 1 && value.contains(split)) {                        spanNum = Integer.parseInt(value.split(split)[1]);                        paragraph01 = new Paragraph(value.split(split)[0], textFont);                    } else {                        paragraph01 = new Paragraph(value, textFont);                    }                    paragraph01.setAlignment(1);                    PdfPCell cell = new PdfPCell();                    cell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);                    cell.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);//然并卵                    cell.setPaddingTop(-2f);//把字垂直居中                    cell.setPaddingBottom(8f);//把字垂直居中                    cell.addElement(paragraph01);                    cell.setRowspan(spanNum);                    table.addCell(cell);                }            }        }    }    private static void addTitle1(PdfPTable table, String[] titleArr, Font headFont) {        for (String aTitleArr : titleArr) {            Paragraph p = new Paragraph(aTitleArr, headFont);            PdfPCell cell = new PdfPCell();            p.setAlignment(1);            cell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);            cell.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);//然并卵            cell.setPaddingTop(-2f);//把字垂直居中            cell.setPaddingBottom(8f);//把字垂直居中            cell.addElement(p);            table.addCell(cell);        }    }    /**     * 改变合并列的值     * @param drugList 内容支持 'A,A,B,C,D,D,D,E' 支持 'A,A,B,C,A,D,D,D,E'     * @return     */    private static List<String> changeList(List<String> drugList) {        List<String> drugListCopy = new ArrayList<String>();        drugListCopy.addAll(drugList);        int nullNum = 0;        for (int i = 0; i < drugList.size(); i++) {            if (i > 0) {                if (drugList.get(i).equals(drugList.get(i - 1))) {                    drugListCopy.set(i, null);                    nullNum++;                } else {                    if (nullNum > 0) {                        int start = i - nullNum - 1;                        drugListCopy.set(start, drugList.get(start) + split + (nullNum + 1));                        nullNum = 0;                    }                }            }        }        return drugListCopy;    }}

效果