用户选择本地文件以后提交后台的上传,后台首先将用户上传的文件获取到,然后通过POI组件对excel进行读取,将每一行数据转换成为对应的Java实体List,然后将List导入数据库。POI组件是APACHE的一个开源项目,你可以到他们的官网下载到,具体POI的使用方法官方网站和很多技术网站都有介绍。
java 读excel 还是比较方便简单的,原理就是,先用java 读取excel,然后,一行行的写入数据库,字段的话,你自己程序里面写就行了,给你个例子:从Excel读取数据,生成新的Excel,以及修改Excel
package common.util
import jxl.*
import jxl.format.UnderlineStyle
import jxl.write.*
import jxl.write.Number
import jxl.write.Boolean
import java.io.*
/**
* Created by IntelliJ IDEA.
* User: xl
* Date: 2005-7-17
* Time: 9:33:22
* To change this template use File | Settings | File Templates.
*/
public class ExcelHandle
{
public ExcelHandle()
{
}
/**
* 读取Excel
*
* @param filePath
*/
public static void readExcel(String filePath)
{
try
{
InputStream is = new FileInputStream(filePath)
Workbook rwb = Workbook.getWorkbook(is)
//Sheet st = rwb.getSheet("0")这里有两种方法获取sheet表,1为名字,而为下标,从0开始
Sheet st = rwb.getSheet("original")
Cell c00 = st.getCell(0,0)
//通用的获取cell值的方式,返回字符串
String strc00 = c00.getContents()
//获得cell具体类型值的方式
if(c00.getType() == CellType.LABEL)
{
LabelCell labelc00 = (LabelCell)c00
strc00 = labelc00.getString()
}
//输出
System.out.println(strc00)
//关闭
rwb.close()
}
catch(Exception e)
{
e.printStackTrace()
}
}
/**
* 输出Excel
*
* @param os
*/
public static void writeExcel(OutputStream os)
{
try
{
/**
* 只能通过API提供的工厂方法来创建Workbook,而不能使用WritableWorkbook的构造函数,
* 因为类WritableWorkbook的构造函数为protected类型
* method(1)直接从目标文件中读取WritableWorkbook wwb = Workbook.createWorkbook(new File(targetfile))
* method(2)如下实例所示 将WritableWorkbook直接写入到输出流
*/
WritableWorkbook wwb = Workbook.createWorkbook(os)
//创建Excel工作表 指定名称和位置
WritableSheet ws = wwb.createSheet("Test Sheet 1",0)
//**************往工作表中添加数据*****************
//1.添加Label对象
Label label = new Label(0,0,"this is a label test")
ws.addCell(label)
//添加带有字型Formatting对象
WritableFont wf = new WritableFont(WritableFont.TIMES,18,WritableFont.BOLD,true)
WritableCellFormat wcf = new WritableCellFormat(wf)
Label labelcf = new Label(1,0,"this is a label test",wcf)
ws.addCell(labelcf)
//添加带有字体颜色的Formatting对象
WritableFont wfc = new WritableFont(WritableFont.ARIAL,10,WritableFont.NO_BOLD,false,
UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.RED)
WritableCellFormat wcfFC = new WritableCellFormat(wfc)
Label labelCF = new Label(1,0,"This is a Label Cell",wcfFC)
ws.addCell(labelCF)
//2.添加Number对象
Number labelN = new Number(0,1,3.1415926)
ws.addCell(labelN)
//添加带有formatting的Number对象
NumberFormat nf = new NumberFormat("#.##")
WritableCellFormat wcfN = new WritableCellFormat(nf)
Number labelNF = new jxl.write.Number(1,1,3.1415926,wcfN)
ws.addCell(labelNF)
//3.添加Boolean对象
Boolean labelB = new jxl.write.Boolean(0,2,false)
ws.addCell(labelB)
//4.添加DateTime对象
jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date())
ws.addCell(labelDT)
//添加带有formatting的DateFormat对象
DateFormat df = new DateFormat("dd MM yyyy hh:mm:ss")
WritableCellFormat wcfDF = new WritableCellFormat(df)
DateTime labelDTF = new DateTime(1,3,new java.util.Date(),wcfDF)
ws.addCell(labelDTF)
//添加图片对象,jxl只支持png格式图片
File image = new File("f:\\2.png")
WritableImage wimage = new WritableImage(0,1,2,2,image)
ws.addImage(wimage)
//写入工作表
wwb.write()
wwb.close()
}
catch(Exception e)
{
e.printStackTrace()
}
}
/**
* 拷贝后,进行修改,其中file1为被copy对象,file2为修改后创建的对象
* 尽单元格原有的格式化修饰是不能去掉的,我们还是可以将新的单元格修饰加上去,
* 以使单元格的内容以不同的形式表现
* @param file1
* @param file2
*/
public static void modifyExcel(File file1,File file2)
{
try
{
Workbook rwb = Workbook.getWorkbook(file1)
WritableWorkbook wwb = Workbook.createWorkbook(file2,rwb)//copy
WritableSheet ws = wwb.getSheet(0)
WritableCell wc = ws.getWritableCell(0,0)
//判断单元格的类型,做出相应的转换
if(wc.getType == CellType.LABEL)
{
Label label = (Label)wc
label.setString("The value has been modified")
}
wwb.write()
wwb.close()
rwb.close()
}
catch(Exception e)
{
e.printStackTrace()
}
}
//测试
public static void main(String[] args)
{
try
{
//读Excel
ExcelHandle.readExcel("f:/testRead.xls")
//输出Excel
File fileWrite = new File("f:/testWrite.xls")
fileWrite.createNewFile()
OutputStream os = new FileOutputStream(fileWrite)
ExcelHandle.writeExcel(os)
//修改Excel
ExcelHandle.modifyExcel(new file(""),new File(""))
}
catch(Exception e)
{
e.printStackTrace()
}
}
}
2.在jsp中做相关测试,创建一个writeExcel.jsp
<%
response.reset()//清除Buffer
response.setContentType("application/vnd.ms-excel")
File fileWrite = new File("f:/testWrite.xls")
fileWrite.createNewFile()
new FileOutputStream(fileWrite)
ExcelHandle.writeExcel(new FileOutputStream(fileWrite))
%>
在IE中浏览writeExcel.jsp就可以动态生成Excel文档了,其中response.setContentType("application/vnd.ms- excel")语句必须要,才能确保不乱码,在jsp中输入<%@page contentType="application/vnd.ms- excelcharset=GBK"%>不行。
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