关于 jsp servlet 将Excel表格内容写进数据库，将数据库导出到Excel中。（一）

从EXCEL到数据库，引入poi.jar
jsp如下

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<form enctype="multipart/form-data" name=testform method=post action=Testaction>
  <table>
    <tr>
       <td><font size=2>批量上传：</font><input type="file" name="test" size="10"><br></td>
      <td><input type="submit" name="批量上传" size="10"value="批量上传"><br></td></tr></table><br>
      </form>

Servlet如下

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package control;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Testaction extends HttpServlet {

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {


    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     *
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        //接收上传文件内容中临时文件的文件名
        String tempFileName = new String("tempFileName");
        //tempfile 对象指向临时文件
        File tempFile = new File("D:/"+tempFileName);
        //outputfile 文件输出流指向这个临时文件
        FileOutputStream outputStream = new FileOutputStream(tempFile);
        //得到客服端提交的所有数据
        InputStream fileSourcel = request.getInputStream();
        //将得到的客服端数据写入临时文件
        byte b[] = new byte[1000];
        int n ;
        while ((n=fileSourcel.read(b))!=-1){
         outputStream.write(b,0,n);
        }

        //关闭输出流和输入流
        outputStream.close();
        fileSourcel.close();

        //randomFile对象指向临时文件
        RandomAccessFile randomFile = new RandomAccessFile(tempFile,"r");
        //读取临时文件的第一行数据
        randomFile.readLine();
        //读取临时文件的第二行数据，这行数据中包含了文件的路径和文件名
        String filePath = randomFile.readLine();
        System.out.println(filePath);
        //得到文件名
        int position = filePath.lastIndexOf('\\');
        CodeToString codeToString = new CodeToString();
        String filename = codeToString.codeString(filePath.substring(position,filePath.length()-1));
        //重新定位读取文件指针到文件头
        randomFile.seek(0);
        //得到第四行回车符的位置，这是上传文件数据的开始位置
        long forthEnterPosition = 0;
        int forth = 1;
        while((n=randomFile.readByte())!=-1&&(forth<=4)){
         if(n=='\n'){
         forthEnterPosition = randomFile.getFilePointer();
         forth++;
         }
        }

            //生成上传文件的目录
        File fileupLoad = new File("F:/MyEclipse/Manager/WebRoot/file","upLoad");
        fileupLoad.mkdir();
        //saveFile 对象指向要保存的文件
        File saveFile = new File("F:/MyEclipse/Manager/WebRoot/file/upLoad",filename);
        RandomAccessFile randomAccessFile = new RandomAccessFile(saveFile,"rw");
        //找到上传文件数据的结束位置，即倒数第四行
        randomFile.seek(randomFile.length());
        long endPosition = randomFile.getFilePointer();
        int j = 1;
        while((endPosition>=0)&&(j<=4)){
         endPosition--;
         randomFile.seek(endPosition);
         if(randomFile.readByte()=='\n'){
         j++;
         }
        }

        //从上传文件数据的开始位置到结束位置，把数据写入到要保存的文件中
        randomFile.seek(forthEnterPosition);
        long startPoint = randomFile.getFilePointer();
        while(startPoint<endPosition){
         randomAccessFile.write(randomFile.readByte());
         startPoint = randomFile.getFilePointer();
        }
        randomAccessFile.close();
        randomFile.close();
        tempFile.delete();

        TestExcel t=new TestExcel();
        t.add();


    }




}

真正的核心代码，分析EXCEL

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package control;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;

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;
 import db.DB;
import db.Test_table;
 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 = "F://MyEclipse//Manager//WebRoot//file//upLoad//test.xls";
       public void add() {
             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sqlserver数据库中
                         String[] val = value.split(",");
                         DB db=new DB();
                         Test_table jBean=new Test_table();
                         String sql ="insert into test_table(num1,num2,num3) values('"+val[0]+"','"+val[1]+"','"+val[2]+"')";

                         int count=db.getInserttest(sql, jBean);
                         System.out.println("------------------"+sql);
                         if(count>0){
                             //关闭文件输入、输出


                   }
                         }}
       } catch (FileNotFoundException e) {
             e.printStackTrace();
       } catch (IOException e) {
             e.printStackTrace();
      }
    }
 }

DB数据库连接类

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public class DB {

    private static DB db = null;
    private static Connection conn = null;
    private static PreparedStatement pstmt = null;
    private static Statement stmt = null;
     //单例模式,new DB类的时候,创建唯一对象,只初始化一次,
     //注意:不要显式闭此static中的Connection和Statement对象,否则抛空指针异常
     static{
     try {
          Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
          conn=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=Market" ,"sa","a");
          stmt = conn.createStatement();
     System.out.println("--------初始化---------");
     } catch (ClassNotFoundException e) {
     System.out.println("---------- 加载数据库驱动类时发生异常: ----------");
     e.printStackTrace();
     } catch (SQLException e) {
     System.out.println("------------ getConnection()方法发生异常--------------");
     }
     }
     public PreparedStatement prepareStmt(String sql){
         PreparedStatement pstmt = null;
         try {
         pstmt = conn.prepareStatement(sql);
         } catch (SQLException e) {
         System.out.println("-------------prepareStmt()方法发生异常-------------------");
         e.printStackTrace();
         }
         return pstmt;
         }
     //执行查询所有记录操作
     public ResultSet exeQuery(String sql){
     ResultSet rs = null;
     try {
          rs = stmt.executeQuery(sql);
     } catch (SQLException e) {
     System.out.println("------------exeQuery()方法发生异常: --------------------");
     e.printStackTrace();
     }
     return rs;
     }
     public void exeUpdate(String sql){
          try{
          stmt.executeUpdate(sql);
          } catch(SQLException e){
          System.out.println("------------- exeUpdate()方法发生异常------------------");
          e.printStackTrace();
          }
          }
     //关闭PreparedStatement对象
     public void closePstmt(PreparedStatement pstmt){
     try{
     pstmt.close();
     pstmt = null;
     }catch(SQLException e){
     System.out.println("-------------------- DB.closePstmt()方法发生异常 -------------------------");
     e.printStackTrace();
     }
     }
     //关闭ResultSet对象
     public void closeRs(ResultSet rs){
     try{
          if(rs!=null)
     rs.close();
     // rs = null;
     }catch(SQLException e){
     System.out.println("-------------------- DB.closePstmt()方法发生异常 -------------------------");
     e.printStackTrace();
     }
     }
     public Connection getDB()
     {
     return conn ;
     }

数据库  表名为 test_table  字段名称为num1，num2，num3。

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