Struts2利用iText导出word文档（包含表格）

struts.xml里的配置如下：

<!-- 保存为word文件 -->
       <action name="studentCurriculumWord" class="studentCurriculumWordAction">
             <result name="success" type="stream"> 
              <param name="contentType">application/vnd.ms-word</param> 
              <param name="contentDisposition">attachment;filename="studentCurriculum.doc"</param> 
              <param name="inputName">wordFile</param> 
          </result>
       </action>

 对应的Action代码如下：

import java.awt.Color;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.List;
import java.util.Map;

import cn.com.wiscom.jwxk.entity.StudentCurriculum;

import com.lowagie.text.Cell;
import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.Table;
import com.lowagie.text.rtf.RtfWriter2;
import com.lowagie.text.rtf.style.RtfFont;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/** 学生课表导出 */
public class StudentCurriculumWordAction extends ActionSupport {

    private static final long serialVersionUID = 2150958354251222076L;

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        return SUCCESS;
    }

    @SuppressWarnings( { "serial", "unchecked" })
    public InputStream getWordFile() throws Exception {
        Map<String, Object> session = ActionContext.getContext().getSession();
        List<StudentCurriculum> leftList = (List<StudentCurriculum>) session
                .get("stuCurriculumleftList");
        String[] stuCurriculumArray = (String[]) session
                .get("stuCurriculumrightArray");
        float totalXf = 0;

        /** 创建Document对象（word文档）  */
        Document doc = new Document(PageSize.A4);
        /** 新建字节数组输出流 */
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        /** 建立一个书写器与document对象关联，通过书写器可以将文档写入到输出流中  */
        RtfWriter2.getInstance(doc, baos);
        doc.open();

        /** 标题字体  */
        RtfFont titleFont = new RtfFont("仿宋_GB2312", 12, Font.NORMAL,
                Color.BLACK);
        /** 正文字体  */
        RtfFont contextFont = new RtfFont("仿宋_GB2312", 9, Font.NORMAL,
                Color.BLACK);

        /** 表格设置  */
        Table table = new Table(12, 16);
        int[] withs = { 3, 9, 5, 4, 4, 3, 3, 14, 14, 14, 14, 14 };
        /** 设置每列所占比例  */
        table.setWidths(withs);
        /** 表格所占页面宽度  */
        table.setWidth(100);
        /** 居中显示  */
        table.setAlignment(Element.ALIGN_CENTER);
        /** 自动填满  */
        table.setAutoFillEmptyCells(true);

        /** 第一行（标题）  */
        String titleString = "东南大学 "
                + (String) session.get("selectXn")
                + "-"
                + String.valueOf(Integer.parseInt((String) session
                        .get("selectXn"))) + " 学年第 "
                + (String) session.get("selectXq") + "学期 学生个人课表";
        Paragraph title = new Paragraph(titleString);
        // 设置标题格式对其方式
        title.setAlignment(Element.ALIGN_CENTER);
        title.setFont(titleFont);
        doc.add(title);

        /** 第二行（正文）  */
        String contextString = "院系:" + (String) session.get("yxmc") + "    专业:"
                + (String) session.get("zymc") + "    学号:"
                + (String) session.get("xh") + "    一卡通号:"
                + (String) session.get("userId") + "    姓名:"
                + (String) session.get("stuName");
        Paragraph context = new Paragraph(contextString);
        // 正文格式对齐方式
        context.setAlignment(Element.ALIGN_CENTER);
        context.setFont(contextFont);
        // 与上一段落（标题）的行距
        context.setSpacingBefore(10);
        // 设置第一行空的列数（缩进）
        // context.setFirstLineIndent(20);
        doc.add(context);

        /** 第三行（表格）  */
        Cell[] cellHeaders = new Cell[11];
        cellHeaders[0] = new Cell(new Phrase("序号", contextFont));
        cellHeaders[1] = new Cell(new Phrase("课程名称", contextFont));
        cellHeaders[2] = new Cell(new Phrase("教师", contextFont));
        cellHeaders[3] = new Cell(new Phrase("学分", contextFont));
        cellHeaders[4] = new Cell(new Phrase("上课周次", contextFont));
        cellHeaders[5] = new Cell(new Phrase(" ", contextFont));
        cellHeaders[5].setColspan(2);
        cellHeaders[6] = new Cell(new Phrase("星期一", contextFont));
        cellHeaders[7] = new Cell(new Phrase("星期二", contextFont));
        cellHeaders[8] = new Cell(new Phrase("星期三", contextFont));
        cellHeaders[9] = new Cell(new Phrase("星期四", contextFont));
        cellHeaders[10] = new Cell(new Phrase("星期五", contextFont));
        for (int i = 0; i < 11; i++) {
            /** 居中显示  */
            cellHeaders[i].setHorizontalAlignment(Element.ALIGN_CENTER);
            /** 纵向居中显示  */
            cellHeaders[i].setVerticalAlignment(Element.ALIGN_MIDDLE);
            table.addCell(cellHeaders[i]);
        }
        /** 向表格填充数据  */
        for (int i = 0; i < 15; i++) {
            /** 第0列  */
            Cell cell0 = new Cell(
                    new Phrase(String.valueOf(i + 1), contextFont));
            cell0.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell0.setVerticalAlignment(Element.ALIGN_MIDDLE);
            table.addCell(cell0);

            /** 第1-4列  */
            Cell[] cell1_4 = new Cell[4];
            if (i < leftList.size()) {
                cell1_4[0] = new Cell(new Phrase(str_changenbsp(leftList.get(i)
                        .getKcmc()), contextFont));
                cell1_4[1] = new Cell(new Phrase(str_changenbsp(leftList.get(i)
                        .getJsxm()), contextFont));
                cell1_4[2] = new Cell(new Phrase(str_changenbsp(leftList.get(i)
                        .getXf()), contextFont));
                cell1_4[3] = new Cell(new Phrase(str_changenbsp(leftList.get(i)
                        .getJszc()), contextFont));
            }
            for (int n = 0; n < cell1_4.length; n++) {
                cell1_4[n].setHorizontalAlignment(Element.ALIGN_CENTER);
                cell1_4[n].setVerticalAlignment(Element.ALIGN_MIDDLE);
                table.addCell(cell1_4[n]);
            }
            /** 第5列  */
            Cell cell5 = null;
            if (i == 0) {
                cell5 = new Cell(new Phrase("上午", contextFont));
                cell5.setRowspan(5);
            }
            if (i == 5) {
                cell5 = new Cell(new Phrase("下午", contextFont));
                cell5.setRowspan(5);
            }
            if (i == 10) {
                cell5 = new Cell(new Phrase("晚上", contextFont));
                cell5.setRowspan(2);
            }
            if (i == 12) {
                cell5 = new Cell(new Phrase("周六", contextFont));
                cell5.setColspan(2);
            }
            if (i == 13) {
                cell5 = new Cell(new Phrase("周日", contextFont));
                cell5.setColspan(2);
            }
            if (i == 14) {
                cell5 = new Cell(new Phrase("备注", contextFont));
                cell5.setColspan(2);
            }
            if (cell5 != null) {
                cell5.setHorizontalAlignment(Element.ALIGN_CENTER);
                cell5.setVerticalAlignment(Element.ALIGN_MIDDLE);
                table.addCell(cell5);
            }
            /** 第6列  */
            if (i < 12) {
                Cell cell2 = new Cell(new Phrase(String.valueOf(i + 1),
                        contextFont));
                cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
                cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);
                table.addCell(cell2);
            }
            /** 第7-11列  */
            if (i == 0 || i == 5 || i == 10) {
                Cell[] cell7_11 = new Cell[5];
                for (int n = 0; n < 5; n++) {
                    cell7_11[n] = new Cell(new Phrase(
                            str_changebr(stuCurriculumArray[i + n]),
                            contextFont));
                    cell7_11[n].setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell7_11[n].setVerticalAlignment(Element.ALIGN_MIDDLE);
                    if (i == 0 || i == 5) {
                        cell7_11[n].setRowspan(5);
                    } else {
                        cell7_11[n].setRowspan(2);
                    }
                    table.addCell(cell7_11[n]);
                }
            }
            Cell cell7 = null;
            if (i == 12) {
                cell7 = new Cell(new Phrase(
                        str_changebr(stuCurriculumArray[15]), contextFont));
            }
            if (i == 13) {
                cell7 = new Cell(new Phrase(
                        str_changebr(stuCurriculumArray[16]), contextFont));
            }
            if (i == 14) {
                cell7 = new Cell(new Phrase(
                        str_changebr(stuCurriculumArray[17]), contextFont));
            }
            if (cell7 != null) {
                cell7.setColspan(5);
                cell7.setHorizontalAlignment(Element.ALIGN_CENTER);
                cell7.setVerticalAlignment(Element.ALIGN_MIDDLE);
                table.addCell(cell7);
            }

        }

        doc.add(table);
        doc.close();

        // 得到输入流  
         ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        baos.close();
        return bais;
    }

    public String str_changenbsp(String str) {
        if (str != null) {
            return str.replaceAll("&nbsp;", "");
        } else {
            return "";
        }
    }

    public String str_changebr(String str) {
        if (str != null) {
            return str.replaceAll("<br>", "\n");
        } else {
            return "";
        }
    }
}

这里在使用时经常会出现这个错误：

当出现这个错误的时候：首先我们先去检查：