用java将数据写入excel

首先需要一个JXL包，下载地址：http://download.csdn.net/source/292830
1、生成EXCEL需要手动写查询语句把ORACLE数据库中的数据查询出来，再通过操作写到EXCEL文件里面。
2、通过EXCEL把数据读取到ORACLE，同样需要去读取EXCEL工作薄里面的内容，再通过INSERT语句去插入数据库操作。

示例：
包括从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-excel;charset=GBK"%>不行。 

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-excel;charset=GBK"%>不行。