java生成Excel两种方式及导入

方法一，利用第三方jar包:jxl.jar

无论方法一方法二最后最好用转换成流传给前端。

public void createExcel(){  
        try{  
            //打开文件  
            WritableWorkbook workbook = Workbook.createWorkbook(new File("test.xls"));  
            //生成名为“第一页”的工作表，参数0表示这是第一页   
            WritableSheet sheet = workbook.createSheet("第一页", 0);  
            //在Label对象的构造子中指名单元格位置是第一列第一行(0,0)   
            //以及单元格内容为test   
            Label label = new Label(0,0,"test");  
            //将定义好的单元格添加到工作表中   
            sheet.addCell(label);  
            /*生成一个保存数字的单元格 　　 
             * 必须使用Number的完整包路径，否则有语法歧义 　　 
             * 单元格位置是第二列，第一行，值为789.123*/   
            jxl.write.Number number = new jxl.write.Number(1,0,756);  
              
            sheet.addCell(number);  
              
            sheet.insertColumn(1);  
              
            workbook.copySheet(0, "第二页", 1);  
              
            WritableSheet sheet2 = workbook.getSheet(1);  
            Range range = sheet2.mergeCells(0, 0, 0, 8);  
            sheet2.unmergeCells(range);  
              
            sheet2.addImage(new WritableImage(5, 5, 10, 20, new File("F:\09.png")));  
              
              
            CellView cv = new CellView();  
              
            WritableCellFormat cf = new WritableCellFormat();  
            cf.setBackground(Colour.BLUE);  
              
            cv.setFormat(cf);  
            cv.setSize(6000);  
            cv.setDimension(10);  
              
            sheet2.setColumnView(2, cv);  
              
            workbook.write();  
            workbook.close();  
              
        }catch(Exception e){}  
    }  

同时，读取Excel中的内容为：

public void displayExcel(){  
        try {  
            Workbook wb = Workbook.getWorkbook(new File("test.xls"));  
              
            Sheet s = wb.getSheet(0);  
            System.out.println(s.getCell(0, 0).getContents());  
        } catch (BiffException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        } catch (IOException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
          
    }  

方法二，利用jar包：poi-3.2-FINAL-20081019.jar

public void exportExcel(){  
          
        HSSFWorkbook wb = new HSSFWorkbook();//创建工作薄  
          
        HSSFFont font = wb.createFont();  
        font.setFontHeightInPoints((short)24);  
        font.setFontName("宋体");  
        font.setColor(HSSFColor.BLACK.index);  
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);  
          
        HSSFCellStyle style = wb.createCellStyle();  
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);  
        style.setFillForegroundColor(HSSFColor.LIGHT_TURQUOISE.index);  
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);  
        style.setBorderBottom(HSSFCellStyle.BORDER_THICK);  
        style.setFont(font);  
          
        HSSFSheet sheet = wb.createSheet("test");//创建工作表，名称为test  
          
        int iRow = 0;//行号  
        int iMaxCol = 17;//最大列数  
        HSSFRow row = sheet.createRow(iRow);  
        HSSFCell cell = row.createCell((short)0);  
        cell.setCellValue(new HSSFRichTextString("测试excel"));  
        cell.setCellStyle(style);  
        sheet.addMergedRegion(new Region(iRow,(short)0,iRow,(short)(iMaxCol-1)));  
          
        ByteArrayOutputStream os = new ByteArrayOutputStream();  
          
        try{  
            wb.write(os);  
        }catch(IOException e){  
            e.printStackTrace();  
            //return null;  
        }  
          
        byte[] xls = os.toByteArray();  
          
        File file = new File("test01.xls");  
        OutputStream out = null;  
        try {  
             out = new FileOutputStream(file);  
             try {  
                out.write(xls);  
            } catch (IOException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
            }  
        } catch (FileNotFoundException e1) {  
            // TODO Auto-generated catch block  
            e1.printStackTrace();  
        }  
          
          
    }  

 这里补上相关的jar包：jxl.jar, poi.jar   的下载地址：

http://download.csdn.net/download/kuangfengbuyi/4658127

三、Excel导入到数据库

1、添加POI jar包到项目的lib目录下­
2、Excel文件目录:d://excel.xls­
3、数据库字段为:num1 num2 num3 num4 num5 num6­
4、数据库名：blog­
5、表名:test­
6、编写类：连接mysql的字符串方法、插入的方法、实体类­­

import java.io.FileInputStream;­
import java.io.FileNotFoundException;­
import java.io.IOException;­
import org.apache.commons.logging.Log;­
import org.apache.commons.logging.LogFactory;­
import org.apache.poi.hssf.usermodel.HSSFCell;­
import org.apache.poi.hssf.usermodel.HSSFRow;­
import org.apache.poi.hssf.usermodel.HSSFSheet;­
import org.apache.poi.hssf.usermodel.HSSFWorkbook;­

public class TestExcel {­
      //记录类的输出信息­
      static Log log = LogFactory.getLog(TestExcel.class); ­
      //获取Excel文档的路径­
      public static String filePath = "D://excel.xls";­
      public static void main(String[] args) {­
            try {­
                  // 创建对Excel工作簿文件的引用­
                  HSSFWorkbook wookbook = new HSSFWorkbook(new FileInputStream(filePath));­ 
                  // 在Excel文档中，第一张工作表的缺省索引是0
                  // 其语句为：HSSFSheet sheet = workbook.getSheetAt(0);­
                  HSSFSheet sheet = wookbook.getSheet("Sheet1");­
                  //获取到Excel文件中的所有行数­
                  int rows = sheet.getPhysicalNumberOfRows();
                  //遍历行­
                  for (int i = 0; i < rows; i++) {­
                        // 读取左上端单元格­
                        HSSFRow row = sheet.getRow(i);­
                        // 行不为空­
                        if (row != null) {­
                              //获取到Excel文件中的所有的列­
                              int cells = row.getPhysicalNumberOfCells();­
                              String value = "";     ­
                              //遍历列­
                              for (int j = 0; j < cells; j++) {­
                                    //获取到列的值­
                                    HSSFCell cell = row.getCell(j);­
                                    if (cell != null) {­
                                          switch (cell.getCellType()) {­
                                                case HSSFCell.CELL_TYPE_FORMULA:­
                                                break;­
                                                case HSSFCell.CELL_TYPE_NUMERIC:­
                                                      value += cell.getNumericCellValue() + ",";        ­
                                                break;  ­
                                                case HSSFCell.CELL_TYPE_STRING:­
                                                      value += cell.getStringCellValue() + ",";­
                                                break;­
                                                default:­
                                                      value += "0";­
                                                break;­
                                    }­
                              }      
                        }­
                        // 将数据插入到mysql数据库中­
                        String[] val = value.split(",");­
                        TestEntity entity = new TestEntity();­
                        entity.setNum1(val[0]);­
                        entity.setNum2(val[1]);­
                        entity.setNum3(val[2]);­
                        entity.setNum4(val[3]);­
                        entity.setNum5(val[4]);­
                        entity.setNum6(val[5]);­
                        TestMethod method = new TestMethod();­
                        method.Add(entity);­
                  }­
             }­
      } catch (FileNotFoundException e) {­
            e.printStackTrace();­
      } catch (IOException e) {­
            e.printStackTrace();­
      }­
   }­
}­