我说一下JAVA控制EXCEL的方法之一
2007-06-15 13:28
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我说一下JAVA控制EXCEL的方法之一。(BORLAND.COM)
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使用Windows操作系统的朋友对Excel(电子表格)一定不会陌生,但是要使用Java语言来操纵Excel文件并不是一
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件容易的事。在Web应用日益盛行的今天,通过Web来操作Excel文件的需求越来越强烈,目前较为流行的操作是在
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JSP或Servlet 中创建一个CSV (comma separated values)文件,并将这个文件以MIME,text/csv类型返回给浏
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览器,接着浏览器调用Excel并且显示CSV文件。这样只是说可以访问到Excel文件,但是还不能真正的操纵Excel
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文件,本文将给大家一个惊喜,向大家介绍一个开放源码项目 Java Excel API,使用它大家就可以方便地操纵
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Excel文件了。
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JAVA EXCEL API简介
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Java Excel是一开放源码项目,通过它Java开发人员可以读取Excel文件的内容、创建新的Excel文件、更新
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已经存在的Excel文件。使用该API非Windows操作系统也可以通过纯Java应用来处理Excel数据表。因为是使用
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Java编写的,所以我们在Web应用中可以通过JSP、Servlet来调用API实现对Excel数据表的访问。 现在发布的稳
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定版本是V2.0,提供以下功能:
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? 从Excel 95、97、2000等格式的文件中读取数据;
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? 读取Excel公式(可以读取Excel 97以后的公式);
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? 生成Excel数据表(格式为Excel 97);
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? 支持字体、数字、日期的格式化;
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? 支持单元格的阴影操作,以及颜色操作;
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? 修改已经存在的数据表;
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? 现在还不支持以下功能,但不久就会提供了:
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? 不能够读取图表信息;
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可以读,但是不能生成公式,任何类型公式最后的计算值都可以读出;
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应用示例
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从Excel文件读取数据表
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Java Excel API既可以从本地文件系统的一个文件(.xls),也可以从输入流中读取Excel数据表。读取Excel数据
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表的第一步是创建Workbook(术语:工作薄),下面的代码片段举例说明了应该如何操作:(完整代码见
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ExcelReading.java)
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import java.io.*;
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import jxl.*;
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… … … …
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try
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...{
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//构建Workbook对象, 只读Workbook对象
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//直接从本地文件创建Workbook
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//从输入流创建Workbook
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InputStream is = new FileInputStream(sourcefile);
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jxl.Workbook rwb = Workbook.getWorkbook(is);
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}
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catch (Exception e)
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...{
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e.printStackTrace();
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}
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一旦创建了Workbook,我们就可以通过它来访问Excel Sheet(术语:工作表)。参考下面的代码片段:
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//获取第一张Sheet表
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Sheet rs = rwb.getSheet(0);
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我们既可能通过Sheet的名称来访问它,也可以通过下标来访问它。如果通过下标来访问的话,要注意的一点
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是下标从0开始,就像数组一样。
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一旦得到了Sheet,我们就可以通过它来访问Excel Cell(术语:单元格)。参考下面的代码片段:
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//获取第一行,第一列的值
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Cell c00 = rs.getCell(0, 0);
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String strc00 = c00.getContents();
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//获取第一行,第二列的值
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Cell c10 = rs.getCell(1, 0);
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String strc10 = c10.getContents();
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//获取第二行,第二列的值
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Cell c11 = rs.getCell(1, 1);
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String strc11 = c11.getContents();
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System.out.println("Cell(0, 0)" + " value : " + strc00 + "; type : " +
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c00.getType());
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System.out.println("Cell(1, 0)" + " value : " + strc10 + "; type : " +
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c10.getType());
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System.out.println("Cell(1, 1)" + " value : " + strc11 + "; type : " +
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c11.getType());
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如果仅仅是取得Cell的值,我们可以方便地通过getContents()方法,它可以将任何类型的Cell值都作为一个
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字符串返回。示例代码中Cell(0, 0)是文本型,Cell(1, 0)是数字型,Cell(1,1)是日期型,通过getContents()
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,三种类型的返回值都是字符型。
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如果有需要知道Cell内容的确切类型,API也提供了一系列的方法。参考下面的代码片段:
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String strc00 = null;
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double strc10 = 0.00;
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Date strc11 = null;
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Cell c00 = rs.getCell(0, 0);
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Cell c10 = rs.getCell(1, 0);
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Cell c11 = rs.getCell(1, 1);
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if(c00.getType() == CellType.LABEL)
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...{
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LabelCell labelc00 = (LabelCell)c00;
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strc00 = labelc00.getString();
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}
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if(c10.getType() == CellType.NUMBER)
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...{
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NmberCell numc10 = (NumberCell)c10;
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strc10 = numc10.getValue();
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}
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if(c11.getType() == CellType.DATE)
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...{
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DateCell datec11 = (DateCell)c11;
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strc11 = datec11.getDate();
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}
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System.out.println("Cell(0, 0)" + " value : " + strc00 + "; type : " +
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c00.getType());
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System.out.println("Cell(1, 0)" + " value : " + strc10 + "; type : " +
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c10.getType());
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System.out.println("Cell(1, 1)" + " value : " + strc11 + "; type : " +
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c11.getType());
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在得到Cell对象后,通过getType()方法可以获得该单元格的类型,然后与API提供的基本类型相匹配,强制
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转换成相应的类型,最后调用相应的取值方法getXXX(),就可以得到确定类型的值。API提供了以下基本类型,与
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Excel的数据格式相对应。
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每种类型的具体意义,请参见Java Excel API Document。
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当你完成对Excel电子表格数据的处理后,一定要使用close()方法来关闭先前创建的对象,以释放读取数据表的
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过程中所占用的内存空间,在读取大量数据时显得尤为重要。参考如下代码片段:
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//操作完成时,关闭对象,释放占用的内存空间
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rwb.close();
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Java Excel API提供了许多访问Excel数据表的方法,在这里我只简要地介绍几个常用的方法,其它的方法请参考
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附录中的Java Excel API Document。
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? Workbook类提供的方法
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1. int getNumberOfSheets()
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获得工作薄(Workbook)中工作表(Sheet)的个数,示例:
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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int sheets = rwb.getNumberOfSheets();
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2. Sheet[] getSheets()
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返回工作薄(Workbook)中工作表(Sheet)对象数组,示例:
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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Sheet[] sheets = rwb.getSheets();
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3. String getVersion()
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返回正在使用的API的版本号,好像是没什么太大的作用。
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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String apiVersion = rwb.getVersion();
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? Sheet接口提供的方法
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1. String getName()
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获取Sheet的名称,示例:
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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jxl.Sheet rs = rwb.getSheet(0);
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String sheetName = rs.getName();
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2. int getColumns()
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获取Sheet表中所包含的总列数,示例:
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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jxl.Sheet rs = rwb.getSheet(0);
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int rsColumns = rs.getColumns();
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3. Cell[] getColumn(int column)
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获取某一列的所有单元格,返回的是单元格对象数组,示例:
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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jxl.Sheet rs = rwb.getSheet(0);
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Cell[] cell = rs.getColumn(0);
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4. int getRows()
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获取Sheet表中所包含的总行数,示例:
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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jxl.Sheet rs = rwb.getSheet(0);
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int rsRows = rs.getRows();
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5. Cell[] getRow(int row)
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获取某一行的所有单元格,返回的是单元格对象数组,示例子:
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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jxl.Sheet rs = rwb.getSheet(0);
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Cell[] cell = rs.getRow(0);
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6. Cell getCell(int column, int row)
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获取指定单元格的对象引用,需要注意的是它的两个参数,第一个是列数,第二个是行数,这与通常的行、列组
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合有些不同。
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jxl.Workbook rwb = jxl.Workbook.getWorkbook(new File(sourcefile));
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jxl.Sheet rs = rwb.getSheet(0);
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Cell cell = rs.getCell(0, 0);
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生成新的Excel工作薄
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下面的代码主要是向大家介绍如何生成简单的Excel工作表,在这里单元格的内容是不带任何修饰的(如:字
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
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体,颜色等等),所有的内容都作为字符串写入。(完整代码见ExcelWriting.java)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
与读取Excel工作表相似,首先要使用Workbook类的工厂方法创建一个可写入的工作薄(Workbook)对象,这里
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要注意的是,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
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
WritableWorkbook的构造函数为protected类型。示例代码片段如下:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
import java.io.*;
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import jxl.*;
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import jxl.write.*;
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… … … …
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try
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
...{
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//构建Workbook对象, 只读Workbook对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
//Method 1:创建可写入的Excel工作薄
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(new File(targetfile));
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
//Method 2:将WritableWorkbook直接写入到输出流
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/**//*
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OutputStream os = new FileOutputStream(targetfile);
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jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(os);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
*/
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
}
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catch (Exception e)
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
...{
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e.printStackTrace();
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}
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API提供了两种方式来处理可写入的输出流,一种是直接生成本地文件,如果文件名不带全路径的话,缺省的
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
文件会定位在当前目录,如果文件名带有全路径的话,则生成的Excel文件则会定位在相应的目录;另外一种是将
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Excel对象直接写入到输出流,例如:用户通过浏览器来访问Web服务器,如果HTTP头设置正确的话,浏览器自动
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
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调用客户端的Excel应用程序,来显示动态生成的Excel电子表格。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
接下来就是要创建工作表,创建工作表的方法与创建工作薄的方法几乎一样,同样是通过工厂模式方法获得
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
相应的对象,该方法需要两个参数,一个是工作表的名称,另一个是工作表在工作薄中的位置,参考下面的代码
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
片段:
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file://创建Excel工作表
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jxl.write.WritableSheet ws = wwb.createSheet("Test Sheet 1", 0);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
"这锅也支好了,材料也准备齐全了,可以开始下锅了!",现在要做的只是实例化API所提供的Excel基本数
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
据类型,并将它们添加到工作表中就可以了,参考下面的代码片段:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
file://1/.添加Label对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.Label labelC = new jxl.write.Label(0, 0, "This is a Label cell");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ws.addCell(labelC);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//添加带有字型Formatting的对象
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jxl.write.WritableFont wf = new jxl.write.WritableFont(WritableFont.TIMES, 18,
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
WritableFont.BOLD, true);
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jxl.write.WritableCellFormat wcfF = new jxl.write.WritableCellFormat(wf);
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jxl.write.Label labelCF = new jxl.write.Label(1, 0, "This is a Label Cell", wcfF);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ws.addCell(labelCF);
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//添加带有字体颜色Formatting的对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.WritableFont wfc = new jxl.write.WritableFont(WritableFont.ARIAL, 10,
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
WritableFont.NO_BOLD, false,
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UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.RED);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.WritableCellFormat wcfFC = new jxl.write.WritableCellFormat(wfc);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.Label labelCFC = new jxl.write.Label(1, 0, "This is a Label Cell", wcfFC);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ws.addCell(labelCF);
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//2.添加Number对象
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jxl.write.Number labelN = new jxl.write.Number(0, 1, 3.1415926);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ws.addCell(labelN);
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//添加带有formatting的Number对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.NumberFormat nf = new jxl.write.NumberFormat("#.##");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.WritableCellFormat wcfN = new jxl.write.WritableCellFormat(nf);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.Number labelNF = new jxl.write.Number(1, 1, 3.1415926, wcfN);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ws.addCell(labelNF);
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//3.添加Boolean对象
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jxl.write.Boolean labelB = new jxl.write.Boolean(0, 2, false);
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ws.addCell(labelB);
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//4.添加DateTime对象
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jxl.write.DateTime labelDT = new jxl.write.DateTime(0, 3, new java.util.Date());
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ws.addCell(labelDT);
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//添加带有formatting的DateFormat对象
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jxl.write.DateFormat df = new jxl.write.DateFormat("dd MM yyyy hh:mm:ss");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.WritableCellFormat wcfDF = new jxl.write.WritableCellFormat(df);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.DateTime labelDTF = new jxl.write.DateTime(1, 3, new java.util.Date(), wcfDF);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ws.addCell(labelDTF);
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这里有两点大家要引起大家的注意。第一点,在构造单元格时,单元格在工作表中的位置就已经确定了。一
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
旦创建后,单元格的位置是不能够变更的,尽管单元格的内容是可以改变的。第二点,单元格的定位是按照下面
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
这样的规律(column, row),而且下标都是从0开始,例如,A1被存储在(0, 0),B1被存储在(1, 0)。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
最后,不要忘记关闭打开的Excel工作薄对象,以释放占用的内存,参见下面的代码片段:
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file://写入Exel工作表
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
wwb.write();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//关闭Excel工作薄对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
wwb.close();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
这可能与读取Excel文件的操作有少少不同,在关闭Excel对象之前,你必须要先调用write()方法,因为先前
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的操作都是存储在缓存中的,所以要通过该方法将操作的内容保存在文件中。如果你先关闭了Excel对象,那么只
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
能得到一张空的工作薄了。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
拷贝、更新Excel工作薄
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接下来简要介绍一下如何更新一个已经存在的工作薄,主要是下面二步操作,第一步是构造只读的Excel工作
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
薄,第二步是利用已经创建的Excel工作薄创建新的可写入的Excel工作薄,参考下面的代码片段:(完整代码见
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
ExcelModifying.java)
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file://创建只读的Excel工作薄的对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.Workbook rw = jxl.Workbook.getWorkbook(new File(sourcefile));
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//创建可写入的Excel工作薄对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(new File(targetfile), rw);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//读取第一张工作表
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.WritableSheet ws = wwb.getSheet(0);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//获得第一个单元格对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
jxl.write.WritableCell wc = ws.getWritableCell(0, 0);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//判断单元格的类型, 做出相应的转化
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
if(wc.getType() == CellType.LABEL)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
Label l = (Label)wc;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
l.setString("The value has been modified.");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//写入Excel对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
wwb.write();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//关闭可写入的Excel对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
wwb.close();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
//关闭只读的Excel对象
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
rw.close();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
之所以使用这种方式构建Excel对象,完全是因为效率的原因,因为上面的示例才是API的主要应用。为了提
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
高性能,在读取工作表时,与数据相关的一些输出信息,所有的格式信息,如:字体、颜色等等,是不被处理的
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
,因为我们的目的是获得行数据的值,既使没有了修饰,也不会对行数据的值产生什么影响。唯一的不利之处就
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
是,在内存中会同时保存两个同样的工作表,这样当工作表体积比较大时,会占用相当大的内存,但现在好像内
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
存的大小并不是什么关键因素了。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
一旦获得了可写入的工作表对象,我们就可以对单元格对象进行更新的操作了,在这里我们不必调用API提供
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
的add()方法,因为单元格已经于工作表当中,所以我们只需要调用相应的setXXX()方法,就可以完成更新的操作
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
了。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
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
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
同的形式表现。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
新生成的工作表对象是可写入的,我们除了更新原有的单元格外,还可以添加新的单元格到工作表中,这与
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
示例2的操作是完全一样的。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
最后,不要忘记调用write()方法,将更新的内容写入到文件中,然后关闭工作薄对象,这里有两个工作薄对
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
象要关闭,一个是只读的,另外一个是可写入的。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
下面是在一个Excel表格中创建一个矩阵的简单例子:
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
import org.apache.poi.hssf.usermodel.*;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
import java.io.FileOutputStream;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
// code run against the jakarta-poi-1.5.0-FINAL-20020506.jar.
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
public class PoiTest ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
static public void main(String[] args) throws Exception ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
FileOutputStream fos = new FileOutputStream("foo.xls");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
HSSFWorkbook wb = new HSSFWorkbook();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
HSSFSheet s = wb.createSheet();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
wb.setSheetName(0, "Matrix");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
for(short i=0; i<50; i++) ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
HSSFRow row = s.createRow(i);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
for(short j=0; j<50; j++) ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
HSSFCell cell = row.createCell(j);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
cell.setCellValue(""+i+","+j);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
wb.write(fos);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
fos.close();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
这段代码首先创建一个Workbook,从该Workbook中得到一个表格、命名,然后继续写入一个50x50的矩阵。最后输
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
出到一个名为foo.xls的Excel文件,甚至在Apple Mac机上也可以打开。
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
POI项目是Java应用的令人兴奋的一步,为用户提供了Windows文档集成的新功能,允许Java开发人员方便地扩展
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