最近有这么个需求，发现有现成的开源库jxl可以完美实现我的小需求。

参考两篇文章：

利用Java操作Excel

官方blog教程

源码：jexcelapi.sourceforge.net/‎

直接练习一下，用javac编译：

  1 import java.io.*;
  2 import jxl.*;
  3 
  4 public class Test
  5 {
  6         public static void main(String[] args)
  7         {
  8                 try {
  9                 InputStream is = new FileInputStream("test.xls");
 10                 Workbook book = Workbook.getWorkbook(is);
 11                 Sheet sheet = book.getSheet(0);
 12                 Cell cell = sheet.getCell(2,2);
 13                 String result = cell.getContents();
 14                 System.out.println(result);
 15                 book.close();
 16                 }
 17                 catch(Exception e) {
 18                 System.out.println(e);
 19                 }
 20          
 21         }
 22 } 

居然报错：

linc:~/workspace/java/test-excel$ javac -cp jxl.jar Test.java 
linc:~/workspace/java/test-excel$ ls
jxl.jar  Test.class  Test.java  test.xls
linc:~/workspace/java/test-excel$ java Test
Exception in thread "main" java.lang.NoClassDefFoundError: jxl/Workbook
	at Test.main(Test.java:9)
Caused by: java.lang.ClassNotFoundException: jxl.Workbook
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	... 1 more

网上搜寻方法，并没有解决此问题，没办法，直接用Eclipse来做练习，正常的加入JARS就可以了。

练习的代码如下，读取Excel内容并显示在textview中，textview可以上下滚动。

大概代码如下：

main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/txt_show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:singleLine="false"
        android:scrollbars="vertical"
        android:text="@string/hello_world" />

</RelativeLayout>

MainActivity.java

package com.linc.readdata;

import java.io.FileInputStream;
import java.io.InputStream;

import android.os.Bundle;
import android.app.Activity;
import android.text.method.ScrollingMovementMethod;
import android.view.Menu;
import android.widget.TextView;

import jxl.*;

public class MainActivity extends Activity {
	TextView txt = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		txt = (TextView)findViewById(R.id.txt_show);
		txt.setMovementMethod(ScrollingMovementMethod.getInstance());
		readExcel();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	public void readExcel() {
		  try {
		   InputStream is = new FileInputStream("mnt/sdcard/test.xls");
		   //Workbook book = Workbook.getWorkbook(new File("mnt/sdcard/test.xls"));
		   Workbook book = Workbook.getWorkbook(is);
		   int num = book.getNumberOfSheets();
		   txt.setText("the num of sheets is " + num+ "\n");
		   // 获得第一个工作表对象
		   Sheet sheet = book.getSheet(0);
		   int Rows = sheet.getRows();
		   int Cols = sheet.getColumns();
		   txt.append("the name of sheet is " + sheet.getName() + "\n");
		   txt.append("total rows is " + Rows + "\n");
		   txt.append("total cols is " + Cols + "\n");
		   for (int i = 0; i < Cols; ++i) {
		    for (int j = 0; j < Rows; ++j) {
		     // getCell(Col,Row)获得单元格的值
		     	txt.append("contents:" + sheet.getCell(i,j).getContents() + "\n");
		    }
		   }
		   book.close();
		  } catch (Exception e) {
		   System.out.println(e);
		  }
		}

}

完整项目（带jxl.jar）请猛击这里。

而其他操作本人并没有验证，请自行去读官方教程或参考以下网络中的实现：

public void createExcel() {
  try {
   // 创建或打开Excel文件
   WritableWorkbook book = Workbook.createWorkbook(new File(
     "mnt/sdcard/test.xls"));
   // 生成名为“第一页”的工作表,参数0表示这是第一页
   WritableSheet sheet1 = book.createSheet("第一页", 0);
   WritableSheet sheet2 = book.createSheet("第三页", 2);
   // 在Label对象的构造函数中,元格位置是第一列第一行(0,0)以及单元格内容为test
   Label label = new Label(0, 0, "test");
   // 将定义好的单元格添加到工作表中
   sheet1.addCell(label);
   /*
    * 生成一个保存数字的单元格.必须使用Number的完整包路径,否则有语法歧义
    */
   jxl.write.Number number = new jxl.write.Number(1, 0, 555.12541);
   sheet2.addCell(number);
   // 写入数据并关闭文件
   book.write();
   book.close();
  } catch (Exception e) {
   System.out.println(e);
  }
}
/**
  * jxl暂时不提供修改已经存在的数据表,这里通过一个小办法来达到这个目的,不适合大型数据更新! 这里是通过覆盖原文件来更新的.
  *
  * @param filePath
  */
public void updateExcel(String filePath) {
  try {
   Workbook rwb = Workbook.getWorkbook(new File(filePath));
   WritableWorkbook wwb = Workbook.createWorkbook(new File(
     "d:/new.xls"), 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
   Label label = (Label) wc;
   label.setString("The value has been modified");
   wwb.write();
   wwb.close();
   rwb.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
}
public static void writeExcel(String filePath) {
  try {
   // 创建工作薄
   WritableWorkbook wwb = Workbook.createWorkbook(new File(filePath));
   // 创建工作表
   WritableSheet ws = wwb.createSheet("Sheet1", 0);
   // 添加标签文本
   // Random rnd = new Random((new Date()).getTime());
   // int forNumber = rnd.nextInt(100);
   // Label label = new Label(0, 0, "test");
   // for (int i = 0; i < 3; i++) {
   // ws.addCell(label);
   // ws.addCell(new jxl.write.Number(rnd.nextInt(50), rnd
   // .nextInt(50), rnd.nextInt(1000)));
   // }
   // 添加图片(注意此处jxl暂时只支持png格式的图片)
   // 0,1分别代表x,y 2,5代表宽和高占的单元格数
   ws.addImage(new WritableImage(5, 5, 2, 5, new File(
     "mnt/sdcard/nb.png")));
   wwb.write();
   wwb.close();
  } catch (Exception e) {
   System.out.println(e.toString());
  }
}
}