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如何用java代码将数据库中的数据生成excel表

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- excel;charset=GBK"%不行。