怎么在Java中使用jasperReport对动态列进行打印-创新互联

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示例代码：
public ActionResult projectPrint() { 
  String[] printValue = null; 
  // 从页面中获得要查询的字段 
  String reqPrintValue = getRequest().getParameter("printValue"); 
  // 没有选择则默认全打印 
  if (null == reqPrintValue || StringUtils.isEmpty(reqPrintValue)) { 
   printValue = new String[] { "pnumber", "pname", "pdepart", "pdecision", "pthrow", "plastmonth", "pfund", "ploan" }; 
  } else { 
   printValue = reqPrintValue.split(","); 
  } 
  // 查询统计数据 
  List projectList = getEntityManager().queryPrintProjectInfo(printValue); 
 
  // 将数据转换为Map对象，换化成Map对象 
  List reportDataList = new ArrayList(); 
 
  for (int i = 0; i < projectList.size(); i++) { 
   Object[] personStr = projectList.get(i); 
   Map reportData = new HashMap(); 
   for (int j = 0; j < personStr.length; j++) { 
    reportData.put("field_" + j, String.valueOf(personStr[j])); 
   } 
   reportDataList.add(reportData); 
  } 
 
  int columCount = 0;// 数据列 
  int fieldCount = 0;// 字段列数（因为pname比较长所以想让pname比其它的列长些，故设计这个变量） 
  int pnameCount = -1;// 记录下pname的序号 
  for (int i = 0; i < printValue.length; i++) { 
   // pthrow下面有两列 
   if ("pthrow".equals(printValue[i])) { 
    columCount = columCount + 2; 
    fieldCount = fieldCount + 2; 
    // ploan下面也有两列 
   } else if ("ploan".equals(printValue[i])) { 
    columCount = columCount + 2; 
    fieldCount = fieldCount + 2; 
    // 故意让pname也占两列 
   } else if ("pname".equals(printValue[i])) { 
    pnameCount = i;// 记录下pname的序号 
    columCount = columCount + 1; 
    fieldCount = fieldCount + 2; 
   } else { 
    // 其它的列都占一个单位 
    columCount = columCount + 1; 
    fieldCount = fieldCount + 1; 
   } 
  } 
 
  InputStream is = null; 
  try { 
   // 从资源文件中读取报表 
   is = this.getClass().getResourceAsStream("/reports/project.jrxml"); 
   JasperDesign jasperDesign = (JasperDesign) JRXmlLoader.load(is); 
 
   Map styleMap = jasperDesign.getStylesMap(); 
   // column header 对应的样式 
   JRDesignStyle theaderStyle = (JRDesignStyle) styleMap.get("theader"); 
   // column detail 对应的样式 
   JRDesignStyle tbodyStyle = (JRDesignStyle) styleMap.get("tboby"); 
   // pagefoot 对应的样式 
   JRDesignStyle tfootStyle = (JRDesignStyle) styleMap.get("tfoot"); 
 
   int _START_X_ = 20;// x轴的起始位置 
   int startX = _START_X_; // x轴的起始位置 
   // 单列的宽度 
   // 535是jasepreReport报表column大的宽度 
   int columnWidth = 535 / fieldCount; 
   // 20,24,15是报表中已设置的，一定与之相同 
   final int columnHeadBandHeight = 20; 
   final int detailHeight = 24; 
   final int pagefootHeight = 15; 
 
   // 设置报表字段 
   for (int idx = 0; idx < columCount; idx++) { 
    JRDesignField field = new JRDesignField(); 
    field.setName("field_" + idx); 
    field.setValueClass(java.lang.String.class); 
    jasperDesign.addField(field); 
   } 
 
   JRDesignBand columnHeadBand = (JRDesignBand) jasperDesign.getColumnHeader(); 
   // 绘制表头 
   for (int idx = 0; idx < printValue.length; idx++) { 
    if ("pnumber".equals(printValue[idx])) { 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     staticText.setWidth(columnWidth); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(2 * columnHeadBandHeight); 
     staticText.setText("序号"); 
     columnHeadBand.addElement(staticText); 
     startX += columnWidth; 
    } else if ("pname".equals(printValue[idx])) { 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     // 项目名称的宽度是其它的宽度的2倍 
     staticText.setWidth(columnWidth * 2); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(2 * columnHeadBandHeight); 
     staticText.setText("项目名称"); 
     columnHeadBand.addElement(staticText); 
     startX += columnWidth * 2; 
    } else if ("pdepart".equals(printValue[idx])) { 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     staticText.setWidth(columnWidth); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(2 * columnHeadBandHeight); 
     staticText.setText("部门"); 
     columnHeadBand.addElement(staticText); 
     startX += columnWidth; 
    } else if ("pdecision".equals(printValue[idx])) { 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     staticText.setWidth(columnWidth); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(2 * columnHeadBandHeight); 
     staticText.setText("已决策"); 
     columnHeadBand.addElement(staticText); 
     startX += columnWidth; 
    } else if ("pthrow".equals(printValue[idx])) { 
     // 投审会下面有两列 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     staticText.setWidth(columnWidth * 2); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("投审会"); 
     columnHeadBand.addElement(staticText); 
 
     staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     columnHeadBand.addElement(staticText); 
     staticText.setWidth(columnWidth); 
     staticText.setY(columnHeadBandHeight); 
     staticText.setX(startX); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("12月初"); 
 
     staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     columnHeadBand.addElement(staticText); 
     staticText.setWidth(columnWidth); 
     staticText.setY(columnHeadBandHeight); 
     staticText.setX(startX + columnWidth); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("12月中"); 
     columnHeadBand.addElement(staticText); 
     startX += 2 * columnWidth; 
    } else if ("plastmonth".equals(printValue[idx])) { 
     // 投决会下面有一列 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     staticText.setWidth(columnWidth); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("投决会"); 
     columnHeadBand.addElement(staticText); 
 
     staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     columnHeadBand.addElement(staticText); 
     staticText.setWidth(columnWidth); 
     staticText.setY(columnHeadBandHeight); 
     staticText.setX(startX); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("12月下"); 
     columnHeadBand.addElement(staticText); 
     startX += columnWidth; 
    } else if ("pfund".equals(printValue[idx])) { 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     staticText.setWidth(columnWidth); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(2 * columnHeadBandHeight); 
     staticText.setText("基金投资额"); 
     columnHeadBand.addElement(staticText); 
     startX += columnWidth; 
    } else if ("ploan".equals(printValue[idx])) { 
     // 投贷协同额下面有两列 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     staticText.setWidth(columnWidth * 2); 
     staticText.setY(0); 
     staticText.setX(startX); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("投贷协同额"); 
     columnHeadBand.addElement(staticText); 
 
     staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     columnHeadBand.addElement(staticText); 
     staticText.setWidth(columnWidth); 
     staticText.setY(columnHeadBandHeight); 
     staticText.setX(startX); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("金额"); 
 
     staticText = new JRDesignStaticText(); 
     staticText.setStyle(theaderStyle); 
     columnHeadBand.addElement(staticText); 
     staticText.setWidth(columnWidth); 
     staticText.setY(columnHeadBandHeight); 
     staticText.setX(startX + columnWidth); 
     staticText.setHeight(columnHeadBandHeight); 
     staticText.setText("入库情况"); 
     columnHeadBand.addElement(staticText); 
     startX += 2 * columnWidth; 
    } 
   } 
 
   // 绘制Detail部门 
   startX = _START_X_; 
   JRDesignBand columnDetailBand = (JRDesignBand) jasperDesign.getDetail(); 
   for (int idx = 0; idx < columCount; idx++) { 
    JRDesignTextField textField = new JRDesignTextField(); 
    textField.setStretchWithOverflow(true); 
    textField.setX(startX); 
    textField.setY(0); 
    if (pnameCount == idx) { 
     textField.setWidth(2 * columnWidth); 
     startX += 2 * columnWidth; 
    } else { 
     textField.setWidth(columnWidth); 
     startX += columnWidth; 
    } 
    textField.setHeight(detailHeight); 
    textField.setPositionType(JRElement.POSITION_TYPE_FLOAT); 
    textField.setStyle(tbodyStyle); 
    textField.setBlankWhenNull(true); 
    JRDesignExpression expression = new JRDesignExpression(); 
    expression.setValueClass(java.lang.String.class); 
    expression.setText("$F{field_" + idx + "}"); 
    textField.setExpression(expression); 
    columnDetailBand.addElement(textField); 
   } 
 
   JRDesignBand pageFootBand = (JRDesignBand) jasperDesign.getPageFooter(); 
   // 合计数据，本应统计的 
   List pageCountList = new ArrayList(); 
   Object[] obj = new String[] { "合计", "15299", "", "", "67121", "92420", "155877", }; 
   pageCountList.add(obj); 
   obj = new String[] { "", "", "", "XXX小计", "", "24473", "16470", }; 
   pageCountList.add(obj); 
   obj = new String[] { "", "", "", "WWW小计", "", "7289", "1674", }; 
   pageCountList.add(obj); 
   obj = new String[] { "", "", "", "ZZZ小计", "", "32700", "13000", }; 
   pageCountList.add(obj); 
   obj = new String[] { "", "", "", "YYY小计", "", "12733", "120733", }; 
   pageCountList.add(obj); 
   obj = new String[] { "", "", "", "AAA小计", "", "2225", "120733", }; 
   pageCountList.add(obj); 
   obj = new String[] { "", "", "", "BBB小计", "", "3000", "0", }; 
   pageCountList.add(obj); 
   int footWidth = 535 / 7; 
   for (int p = 0; p < pageCountList.size(); p++) { 
    for (int k = 0; k < 7; k++) { 
     Object[] ob = pageCountList.get(p); 
     JRDesignStaticText staticText = new JRDesignStaticText(); 
     staticText.setStyle(tfootStyle); 
     staticText.setWidth(footWidth); 
     staticText.setY(pagefootHeight * p); 
     staticText.setX(k * footWidth + _START_X_); 
     staticText.setHeight(pagefootHeight); 
     staticText.setText(String.valueOf(ob[k])); 
     pageFootBand.addElement(staticText); 
    } 
   } 
 
   // 编译报表 
   JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign); 
   String type = this.getRequest().getParameter("type");//pdf格式 
   JasperUtils.prepareReport(jasperReport, type); 
   // 报表数据源 
   JRDataSource dataSource = new JRBeanCollectionDataSource(reportDataList); 
   JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, dataSource); 
   HttpServletResponse response = this.getResponse(); 
   JasperUtils.export(jasperPrint, response, getRequest(), type); 
  } catch (Exception e) { 
   e.printStackTrace(); 
  } 
 
  return null; 
 }
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