JasperReport实现动态列

import java.util.Enumeration;

import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;

import net.sf.jasperreports.engine.JRAlignment;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRTableModelDataSource;
import net.sf.jasperreports.engine.design.JRDesignBand;
import net.sf.jasperreports.engine.design.JRDesignExpression;
import net.sf.jasperreports.engine.design.JRDesignField;
import net.sf.jasperreports.engine.design.JRDesignFrame;
import net.sf.jasperreports.engine.design.JRDesignLine;
import net.sf.jasperreports.engine.design.JRDesignParameter;
import net.sf.jasperreports.engine.design.JRDesignStaticText;
import net.sf.jasperreports.engine.design.JRDesignTextField;
import net.sf.jasperreports.engine.design.JasperDesign;
import net.sf.jasperreports.view.JasperViewer;

/**
 *
 */

/**
 * @author wenliang
 *
 */
public class JDesign {
 static JRDesignBand tIband =null;
 static JRDesignBand cHband =null;
 static JRDesignBand dEband =null;
 static JRDesignStaticText staticText=null;
 static JRDesignFrame frame =null;
 static JRDesignLine line=null;
 static JRDesignTextField textField =null;
 static JRDesignExpression expression=null;
 static int jDWidth=595;   //default width
 static int jDHeight=842;  //default height
 static int cWidth=555;    //default columnWidth
 static JRDesignField field;
 static int width=0;
 static DefaultTableModel dtm=new DefaultTableModel();
 static JasperDesign jasperDesign = null;
 static JasperReport jasperReport = null;
 static JasperPrint jasperPrint = null;
 public static void Preview(String rTitle,JTable tb){
  String colName[] = new String[tb.getColumnCount()];
  for (int i = 0; i < tb.getColumnCount(); i++) {
   colName[i] = tb.getColumnName(i);
  }
  String data[][] = new String[tb.getRowCount()][tb.getColumnCount()];
  for (int i = 0; i < tb.getRowCount(); i++) {
   for (int j = 0; j <tb.getColumnCount(); j++) {
    data[i][j] = String.valueOf(tb.getValueAt(i, j));
   }
  }
  dtm.setDataVector(data, colName);
  try {
   jasperDesign = JDesign.getJasperDesign(rTitle,tb);
  } catch (JRException e) {
   System.out.println("获取生成报表模板信息失败");
   e.printStackTrace();
  }
  try {
   jasperReport = JasperCompileManager
     .compileReport(jasperDesign);
  } catch (JRException e) {
   System.out.println("生成报表模板失败");
   e.printStackTrace();
  }
  try {
   jasperPrint = JasperFillManager.fillReport(
     jasperReport, null, new JRTableModelDataSource(dtm));
  } catch (JRException e) {
   System.out.println("填充报表模板数据失败");
   e.printStackTrace();
  }
  boolean isExitOnClose=false;
  JasperViewer.viewReport(jasperPrint,isExitOnClose);
  tb.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_OFF);
 }
 public static JasperDesign getJasperDesign(String rTitle,JTable tb) throws JRException {
  JDesign.FitTableColumns(tb);//自动调整列宽
  if (width>555) {
   jDWidth=842;
   jDHeight=595;
   cWidth=802;
  }else {
   width=555;
  }
  
  // JasperDesign
  JasperDesign jasperDesign = new JasperDesign();
  jasperDesign.setName(rTitle);
  jasperDesign.setPageWidth(jDWidth);
  jasperDesign.setPageHeight(jDHeight);
  jasperDesign.setColumnWidth(cWidth);
  jasperDesign.setColumnSpacing(0);
  jasperDesign.setLeftMargin(20);
  jasperDesign.setRightMargin(20);
  jasperDesign.setTopMargin(20);
  jasperDesign.setBottomMargin(20);
  
  //Title
  tIband = new JRDesignBand();
  tIband.setHeight(50);
     staticText = new JRDesignStaticText();
  staticText.setX(0);
  staticText.setY(0);
  staticText.setWidth(cWidth);
  staticText.setHeight(50);
  staticText.setHorizontalAlignment(JRAlignment.HORIZONTAL_ALIGN_CENTER);
  staticText.setText(rTitle);
  staticText.setFontSize(22);
  staticText.setBold(true);
  tIband.addElement(staticText);
  jasperDesign.setTitle(tIband);
  
  cHband = new JRDesignBand();
  cHband.setHeight(20);
  frame = new JRDesignFrame();
  frame.setX(0);
  frame.setY(0);
  frame.setWidth(cWidth);
  frame.setHeight(20);
  cHband.addElement(frame);
  
  dEband = new JRDesignBand();
  dEband.setHeight(20);
  
  for (int i = 0; i <tb.getColumnCount(); i++) {
   
   field = new JRDesignField();
   field.setName(tb.getColumnName(i));
   field.setValueClass(java.lang.String.class);
   jasperDesign.addField(field);
   
   staticText = new JRDesignStaticText();
   staticText.setX((width/tb.getColumnCount())*i);
   staticText.setY(0);
   staticText.setWidth(tb.getColumnModel().getColumn(i).getWidth());
   staticText.setHeight(15);
   staticText.setText(tb.getColumnName(i));
   staticText.setBold(true);
   frame.addElement(staticText);
   
   textField = new JRDesignTextField();
   textField.setX((width/tb.getColumnCount())*i);
   textField.setY(0);
   textField.setWidth(tb.getColumnModel().getColumn(i).getWidth());
   textField.setHeight(15);
      expression = new JRDesignExpression();
   expression.setValueClass(java.lang.String.class);
   expression.setText("$F{"+tb.getColumnName(i)+"}");
   textField.setExpression(expression);
   dEband.addElement(textField);
  }
  line = new JRDesignLine();
  line.setX(0);
  line.setY(19);
  line.setWidth(cWidth);
  line.setHeight(0);
  frame.addElement(line);
  
  jasperDesign.setColumnHeader(cHband);

     line = new JRDesignLine();
  line.setX(0);
  line.setY(19);
  line.setWidth(cWidth);
  line.setHeight(0);
  dEband.addElement(line);
  jasperDesign.setDetail(dEband);

  return jasperDesign;

 }
 public static void FitTableColumns(JTable myTable) //这个方法由网上采集,感谢此方法的作者

            //(此方法主要用来动态调整单元格列宽)
 {
     JTableHeader header = myTable.getTableHeader();//获取表头
     int rowCount = myTable.getRowCount();//获取行数
     Enumeration columns = myTable.getColumnModel().getColumns();//获取所有列
     while(columns.hasMoreElements())
     {
         TableColumn column = (TableColumn)columns.nextElement();
         int col = header.getColumnModel().getColumnIndex(column.getIdentifier());
         int width = (int)myTable.getTableHeader().getDefaultRenderer().getTableCellRendererComponent(myTable, column.getIdentifier(), false, false, -1, col).getPreferredSize().getWidth();               
         for(int row = 0; row<rowCount; row++)
          {
              int preferedWidth = (int)myTable.getCellRenderer(row, col).getTableCellRendererComponent(myTable,
              myTable.getValueAt(row, col), false, false, row, col).getPreferredSize().getWidth();
              width = Math.max(width, preferedWidth);
          }
          header.setResizingColumn(column); 
          column.setWidth(width+myTable.getIntercellSpacing().width);
          if(width+myTable.getIntercellSpacing().width<50){
           column.setWidth(50);
          }
      }
 }

}

 

 

可以自己写个测试类。把你的jtable放到上面方法进行测试。在打印预览的时候你可以自己写列的选择功能。