第三步：寫java程式碼，程式碼如下所示

package com.cdsxt;

import java.io.FileOutputStream;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
 * 
 * 測試生成Excel文件
 * 
 * @author Administrator
 * 
 */
public class TestExcel {

	/**
	 * Excel文件的構成
	 * 
	 * 在工作簿(WorkBook)裡面包含了工作表(Sheet) 在工作表裡面包含了行(Row) 行裡面包含了單元格(Cell)
	 * 
	 * 
	 * 建立一個工作簿的基本步驟
	 * 
	 * 第一步 建立一個 工作簿 第二步 建立一個 工作表 第三步 建立一行 第四步 建立單元格 第五步 寫資料 第六步
	 * 將記憶體中生成的workbook寫到檔案中 然後釋放資源
	 * 
	 */

	public static void testCreateFirstExcel97() throws Exception {
		Workbook wb = new HSSFWorkbook();
		FileOutputStream fileOut = new FileOutputStream("C:/workbook.xls");
		wb.write(fileOut);
		fileOut.close();
	}
	public static void testCreateFirstExcel07() throws Exception {
		Workbook wb = new XSSFWorkbook();
		FileOutputStream fileOut = new FileOutputStream("C:/workbook.xlsx");
		wb.write(fileOut);
		fileOut.close();
	}
	
	
	public static void createExcelOfData() throws Exception{
		Workbook wb = new HSSFWorkbook();
		
		//建立工作表
		Sheet sheet = wb.createSheet("測試Excel");
		
		//建立單元格   單元格是隸屬於行
		
		Row row = sheet.createRow(0);   //起始從0開始
		
		Cell cell = row.createCell(0);
		
		cell.setCellValue("This is a test");
		FileOutputStream fileOut = new FileOutputStream("C:/test.xls");
		wb.write(fileOut);
		fileOut.close();
	}
	
	public static void createExcelOfUsers() throws Exception{
		Workbook wb = new HSSFWorkbook();
		
		//建立工作表
		Sheet sheet = wb.createSheet("使用者資訊");
		
		Object [][] data = new Object[][]{
				{1,"zhansgan",20,"
 
[email protected]"},
				{2,"zhansgan1",30,"[email protected]"},
				{3,"zhansgan2",40,"[email protected]"},
				{4,"zhansgan3",20,"[email protected]"},
				{5,"zhansgan4",43,"[email protected]"},
				{6,"zhansgan5",24,"[email protected]"},
				{7,"zhansgan6",55,"[email protected]
 
"},
				{8,"zhansgan7",12,"[email protected]"},
		};
		
		
		//顯示標題
		Row title_row = sheet.createRow(0);
		title_row.setHeight((short)(40*20));
		
		Cell title_cell = title_row.createCell(0); 
		
		
		String headers[] = new String[]{"ID","使用者名稱","年齡","郵箱"};
		
		Row header_row = sheet.createRow(1);
		header_row.setHeight((short)(20*24));
		
		//建立單元格的 顯示樣式
		CellStyle style = wb.createCellStyle();
		style.setAlignment(CellStyle.ALIGN_CENTER); //水平方向上的對其方式
		style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);	//垂直方向上的對其方式
		
		
		title_cell.setCellStyle(style);
		title_cell.setCellValue("使用者詳細資訊");
		
		sheet.addMergedRegion(new CellRangeAddress(0,0,0,headers.length-1));
		
		
		
		for(int i=0;i<headers.length;i++){
			//設定列寬   基數為256
			sheet.setColumnWidth(i, 30*256);
			Cell cell = header_row.createCell(i);
			//應用樣式到  單元格上
			cell.setCellStyle(style);
			cell.setCellValue(headers[i]);
		}
		
		
		
		for(int i=0;i<data.length;i++){
			
			Row row = sheet.createRow(i+2);
			row.setHeight((short)(20*20)); //設定行高  基數為20
			for(int j=0;j<data[i].length;j++){
				Cell cell = row.createCell(j);
				cell.setCellValue(data[i][j].toString());
			}
			
		}
		FileOutputStream fileOut = new FileOutputStream("C:/users.xls");
		wb.write(fileOut);
		fileOut.close();
	}
	
	
	public static void main(String[] args) throws Exception {
//		testCreateFirstExcel97();
//		testCreateFirstExcel07();
		
//		createExcelOfData();
		createExcelOfUsers();
	}

}