JSP 通过Servlet将excel数据导入SQL

1> 在网上下载jxl.jar,这个JAR包用于Java操作excel,下载后，将这个包复制到工程Webroot下的WEB_INF下的lib中，或是在工程中导入jxl.jar包。

2> 准备excel文件,如图所示:

   

3> 数据库建表

注意:我使用的是SQL Server 2005,如果你的数据库与我不同，则修改db.java里的常量!!!

   数据库名:EducationNET   表名:mynews

   id     int    主键 自动增长

   title varchar(50)

   author   varchar(50)

   acontent    varchar(50)

4> 写好导入数据JSP

   <form action="tosqlservlet" method="post">

       选择文件1:<input type="file" name="excel" />

        <input type="submit" value="导入" />

   </form>
5> db.java 用于连接数据库

public class db {

public Connection connstr = null;

public ResultSet res = null;

public PreparedStatement prase = null;

static private String strUrl = "jdbc:sqlserver://localhost:1433;DataBaseName=EducationNET";

static private String strUser = "sa";

static private String strPwd = "123";

public db()

{

   try

     {

    Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

         connstr = DriverManager.getConnection(strUrl, strUser, strPwd);

     }

         catch (SQLException ex)

         {

             System.out.println(ex.getMessage() + "路径错误");

         }

         catch (ClassNotFoundException ex)

         {

             System.out.println(ex.getMessage() + "驱动错误");

         }

         finally{

         System.out.println("成功了");

         }

}

public ResultSet executeQuery(String sql) throws Exception{

   Statement stmt = connstr.createStatement();

   res = stmt.executeQuery(sql);

   return res;

}

public PreparedStatement dosql(String sql) throws Exception{

   prase = connstr.prepareStatement(sql);

   return prase;

}

}

6> excel.java 用于读取excel数据

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.util.*;

import jxl.Sheet;

import jxl.Workbook;

public class excel {

public   List   addCustomerAssign(File   file)

{

        List ls=new ArrayList();

        jxl.Workbook   rwb   =   null;

           try{

             InputStream   is   =   new   FileInputStream(file);

             rwb   =   Workbook.getWorkbook(is);

               Sheet   rs   =   rwb.getSheet(0);

               int   rsRows   =   rs.getRows();

               for(int   i=1;i <rsRows;i++){//如第一行为属性项则从第二行开始取数据(int   i=0   ;i <rsRows;i++)

                String   cell1=rs.getCell(0,i).getContents()+" ";

                String   cell2=rs.getCell(1,i).getContents()+" ";

                String   cell3=rs.getCell(2,i).getContents()+" ";

                   if(cell1!=null&&!cell1.equals(" ")&&cell2!=null&&!cell3.equals(" "))

                   {

                    mynews ms=new mynews();

                    ms.setTitle(rs.getCell(0,i).getContents());

                    ms.setAuthor(rs.getCell(1,i).getContents());

                    ms.setAcontent(rs.getCell(2,i).getContents());

                    ls.add(ms);

                   }

               }

         }catch(Exception   e){

             e.printStackTrace();

         }

         finally{

             rwb.close();

         }

     return ls;

}

}

7> into.java

public class into {

String sql = "insert into mynews(title,author,acontent) values(?,?,?)";

db data=new db();

public PreparedStatement prase = null;

public Boolean insertexcel(mynews ms) {

   Boolean jiaqi = false;

   try {

    prase = data.dosql(sql);

    prase.setString(1, ms.getTitle());

    prase.setString(2, ms.getAuthor());

    prase.setString(3, ms.getAcontent());

    prase.executeUpdate();

    jiaqi = true;

   } catch (Exception e) {

    e.printStackTrace();

   }

   return jiaqi;

}

}

8> 实体类mynews.java

public class mynews {

private int id;

private String title;

private String author;

private String acontent;

public String getAuthor() {

   return author;

}

public void setAuthor(String author) {

   this.author = author;

}

public String getAcontent() {

   return acontent;

}

public void setAcontent(String acontent) {

   this.acontent = acontent;

}

public int getId() {

   return id;

}

public void setId(int id) {

   this.id = id;

}

public String getTitle() {

   return title;

}

public void setTitle(String title) {

   this.title = title;

}

}

9> 建立servlet tosqlservlet

改动它的doPost方法

public void doPost(HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

   into in=new into();

     excel ex=new excel();

     String path=new String(request.getParameter("excel").getBytes("ISO8859-1"),"UTF-8");//红色字体改为：gbk即可解决问题

     System.out.println(path);

     File file=new File(path);

     List ls=ex.addCustomerAssign(file);

     Iterator iter=ls.iterator();

     while(iter.hasNext())

     {

      mynews ms=(mynews)iter.next();

      if(in.insertexcel(ms))

       System.out.println("成功");

      else

       System.out.println("失败");

     }

}

运行后，后台会输出成功，打开数据库表，则会看见excel里德数据已经成功导入数据库.

 

运行前台报错：

解决方法 ：
web.xml中配置：

HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

java.lang.NullPointerException

com.hua.excel.excel.addCustomerAssign(excel.java:46)

com.hua.action.tosqlservlet.doPost(tosqlservlet.java:65)

javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.

--------------------------------------------------------------------------------

Apache Tomcat/6.0.35

张判例  21:04:06

看下后台的信息

海浪  21:04:58

C:\Documents and Settings\Administrator\????\Book1.xls

java.io.FileNotFoundException: C:\Documents and Settings\Administrator\????\Book1.xls (系统找不到指定的路径。)

将excel文件放在盘符中，然后运行。
成功