Java使用poi操作excel实例解析

 
 4.0.0 
 excelDemo1 
 excelDemo1 
 war 
 0.0.1-SNAPSHOT 
 excelDemo1 Maven Webapp 
 http://maven.apache.org 
  
   
   junit 
   junit 
   3.8.1 
   test 
   
   
  org.apache.poi 
  poi 
  3.8 
   
  
  
  excelDemo1 
  

package excelDemo1; 
  
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.OutputStream; 
import org.apache.poi.hssf.usermodel.HSSFRow; 
import org.apache.poi.hssf.usermodel.HSSFSheet; 
import org.apache.poi.hssf.usermodel.HSSFWorkbook; 
  
public class ExcelDemo0 { 
  /** 
   * java生成excel文件并写入磁盘 
   * 
   * @author：tuzongxun 
   * @Title: main 
   * @param@param args 
   * @return void 
   * @date Apr 28,2016 7:32:52 PM 
   * @throws 
   */ 
  public static void main(String[] args) { 
    //C:\Users\tuzongxun123\Desktop桌面，windows和linux的斜杠不一样，而且java对于“/”需要转义处理，File.separator可以实现跨平台 
    File file = new File("C:" + File.separator + "Users" + File.separator 
       + "tuzongxun123" + File.separator + "Desktop" + File.separator 
       + "ioFile" + File.separator + "user.xls"); 
    try { 
      OutputStream outputStream = new FileOutputStream(file); 
      // 创建excel文件，注意这里的hssf是excel2007及以前版本可用，2007版以后的不可用，要用xssf 
      HSSFWorkbook workbook = new HSSFWorkbook(); 
      // 创建excel工作表 
      HSSFSheet sheet = workbook.createSheet("user"); 
      // 为工作表增加一行 
      HSSFRow row = sheet.createRow(0); 
      // 在指定的行上增加两个单元格 
      row.createCell(0).setCellValue("name"); 
      row.createCell(1).setCellValue("password"); 
      // 调用输出流把excel文件写入到磁盘 
      workbook.write(outputStream); 
      // 关闭输出流 
      outputStream.close(); 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
} 

package excelDemo1; 
  
import java.io.BufferedInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import org.apache.poi.hssf.usermodel.HSSFRow; 
import org.apache.poi.hssf.usermodel.HSSFSheet; 
import org.apache.poi.hssf.usermodel.HSSFWorkbook; 
import org.apache.poi.poifs.filesystem.POIFSFileSystem; 
  
/** 
 * 读取excel文件 
 * 
 * @author tuzongxun123 
 * 
 */ 
public class ExcelDemo2 { 
  public static void main(String[] agrs) { 
    try { 
      // 获取excel文件输入流 
      FileInputStream fileInputStream = new FileInputStream("C:" 
         + File.separator + "Users" + File.separator 
         + "tuzongxun123" + File.separator + "Desktop" 
         + File.separator + "ioFile" + File.separator + "user.xls"); 
      BufferedInputStream bufferedInputStream = newBufferedInputStream( 
         fileInputStream); 
      POIFSFileSystem fileSystem = new POIFSFileSystem( 
         bufferedInputStream); 
      // 获取excel文件 
      HSSFWorkbook hssfWorkbook = new HSSFWorkbook(fileSystem); 
      // 根据名称获取指定的excel工作薄 
      HSSFSheet sheet = hssfWorkbook.getSheet("user"); 
      // 这里实际上可以用sheet.rowIterator()来遍历 
      for (int i = 1;; i++) { 
       HSSFRow row = sheet.getRow(i); 
       if (row != null) { 
         String nameString1 = row.getCell(0).getStringCellValue(); 
         String password = row.getCell(i).getStringCellValue(); 
         System.out.println("name:" + nameString1); 
         System.out.println("password:" + password); 
         bufferedInputStream.close(); 
       } else { 
         bufferedInputStream.close(); 
         return; 
       } 
      } 
  
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
}