Java Excel是一開(kāi)放源碼項目，通過(guò)它Java開(kāi)發(fā)人員可以讀取Excel文件的內容、創(chuàng )建新的Excel文件、更新已經(jīng)存在的Excel文件。使用該API非Windows操作系統也可以通過(guò)純Java應用來(lái)處理Excel數據表。因為是使用Java編寫(xiě)的，所以我們在Web應用中可以通過(guò)JSP、Servlet來(lái)調用API實(shí)現對Excel數據表的訪(fǎng)問(wèn)。
提供以下功能：
1.應用示例：
包括從Excel讀取數據,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()
{
}
/**
* 讀取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")這里有兩種方法獲取sheet表,1為名字，而為下標，從0開(kāi)始
Sheet st = rwb.getSheet("original");
Cell c00 = st.getCell(0,0);
//通用的獲取cell值的方式,返回字符串
String strc00 = c00.getContents();
//獲得cell具體類(lèi)型值的方式
if(c00.getType() == CellType.LABEL)
{
LabelCell labelc00 = (LabelCell)c00;
strc00 = labelc00.getString();
}
//輸出
System.out.println(strc00);
//關(guān)閉
rwb.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
/**
* 輸出Excel
*
* @param os
*/
public static void writeExcel(OutputStream os)
{
try
{
/**
* 只能通過(guò)API提供的工廠(chǎng)方法來(lái)創(chuàng )建Workbook，而不能使用WritableWorkbook的構造函數，
* 因為類(lèi)WritableWorkbook的構造函數為protected類(lèi)型
* method(1)直接從目標文件中讀取WritableWorkbook wwb = Workbook.createWorkbook(new File(targetfile));
* method(2)如下實(shí)例所示 將WritableWorkbook直接寫(xiě)入到輸出流
*/
WritableWorkbook wwb = Workbook.createWorkbook(os);
//創(chuàng )建Excel工作表 指定名稱(chēng)和位置
WritableSheet ws = wwb.createSheet("Test Sheet 1",0);
//**************往工作表中添加數據*****************
//1.添加Label對象
Label label = new Label(0,0,"this is a label test");
ws.addCell(label);
//添加帶有字型Formatting對象
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);
//添加帶有字體顏色的Formatting對象
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對象
Number labelN = new Number(0,1,3.1415926);
ws.addCell(labelN);
//添加帶有formatting的Number對象
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對象
Boolean labelB = new jxl.write.Boolean(0,2,false);
ws.addCell(labelB);
//4.添加DateTime對象
jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date());
ws.addCell(labelDT);
//添加帶有formatting的DateFormat對象
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);
//添加圖片對象,jxl只支持png格式圖片
File image = new File("f:\\2.png");
WritableImage wimage = new WritableImage(0,1,2,2,image);//0,1分別代表x,y.2,2代表寬和高占的單元格數
ws.addImage(wimage);
//寫(xiě)入工作表
wwb.write();
wwb.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
/**
* 拷貝后,進(jìn)行修改,其中file1為被copy對象，file2為修改后創(chuàng )建的對象
* 盡單元格原有的格式化修飾是不能去掉的，我們還是可以將新的單元格修飾加上去，
* 以使單元格的內容以不同的形式表現
* @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);
//判斷單元格的類(lèi)型,做出相應的轉換
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();
}
}
//測試
public static void main(String[] args)
{
try
{
//讀Excel
ExcelHandle.readExcel("f:/testRead.xls");
//輸出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中做相關(guān)測試，創(chuàng )建一個(gè)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中瀏覽writeExcel.jsp就可以動(dòng)態(tài)生成Excel文檔了，其中response.setContentType("application/vnd.ms-excel");語(yǔ)句必須要，才能確保不亂碼，在jsp中輸入<%@page contentType="application/vnd.ms-excel;charset=GBK"%>不行。
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