发布于 2016-07-20 11:03:46 | 85 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Java函数式编程,程序狗速度看过来!

Java程序设计语言

java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。


这篇文章主要介绍了java使用POI读取properties文件并写到Excel的方法,涉及java操作properties文件及Excel文件的相关技巧,需要的朋友可以参考下

本文实例讲述了java使用POI读取properties文件并写到Excel的方法。分享给大家供大家参考。具体实现方法如下:


package com.hubberspot.code;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Properties;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
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.hssf.util.HSSFColor;
public class ReadWriteXlsProperties {
  // Create a HashMap which will store the properties 
  HashMap< String, String > propMap = new HashMap< String, String >();
  public static void main(String[] args) {
    // Create object of ReadWriteXlsProperties
    ReadWriteXlsProperties readWriteXlsDemo = new ReadWriteXlsProperties();
    // Call method readProperties() it take path to properties file 
    readWriteXlsDemo.readProperties("config.properties");
    // Call method writeToExcel() it will take path to excel file
    readWriteXlsDemo.writeToExcel("test.xls");
  }
  private void readProperties(String propertiesFilePath) {
    // Create a File object taking in path of properties 
    // file
    File propertiesFile = new File(propertiesFilePath);
    // If properties file is a file do below stuff
    if(propertiesFile.isFile())
    {
      try
      {
        // Create a FileInputStream for loading the properties file
        FileInputStream fisProp = new FileInputStream(propertiesFile);
        // Create a Properties object and load 
        // properties key and value to it through FileInputStream
        Properties properties = new Properties();
        properties.load(fisProp);
        // Create a object of Enumeration and call keys()
        // method over properties object created above
        // it will return us back with a Enumeration types
        Enumeration< Object > keysEnum = properties.keys();
        // Looping over the elements of Enumeration
        while(keysEnum.hasMoreElements())
        {
          // Extracting the key and respective values from it.
          String propKey = (String)keysEnum.nextElement();
          String propValue = (String)properties.getProperty(propKey);
          // After extracting the key and value from the properties file
          // we will store the values in a HashMap.
          propMap.put( propKey.toLowerCase().trim(),propValue.toLowerCase().trim());
        }  
        // printing the HashMap and closing the file FileInputStream
        System.out.println("Properties Map ... \n" + propMap);
        fisProp.close();
      }
      catch(FileNotFoundException e)
      {           
        e.printStackTrace();
      }
      catch(IOException e)
      {          
        e.printStackTrace();
      }
    }
  }
  private void writeToExcel(String excelPath) {
    // Create a Workbook using HSSFWorkbook object
    HSSFWorkbook workBook = new HSSFWorkbook();
    // Create a sheet with name "properties" by 
    // the createSheet method of the Workbook
    HSSFSheet worksheet = workBook.createSheet("Properties");
    // Create a row by calling createRow method of the 
    // Worksheet
    HSSFRow row = worksheet.createRow((short) 0);
    // Create a cell style by calling createCellStyle()
    // from the workbook
    HSSFCellStyle cellStyle = workBook.createCellStyle();
    // setting of the foreground and fill pattern by calling methods
    // of HSSFCellStyle as setFillForegroundColor() and setFillPattern()
    cellStyle.setFillForegroundColor(HSSFColor.GOLD.index);
    cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
    // Create a HSSFCell from the row object created above 
    HSSFCell cell1 = row.createCell(0);
    // Setting the value of the cell as the keys by calling 
    // setCellValue() method over the HSSFCell
    cell1.setCellValue(new HSSFRichTextString("Keys"));
    // Giving it the style created above.
    cell1.setCellStyle(cellStyle);
    HSSFCell cell2 = row.createCell(1);
    cell2.setCellValue(new HSSFRichTextString("Values"));
    cell2.setCellStyle(cellStyle);
    // Create a Iterator and as propMap is a HashMap 
    // it is converted to a HashSet by calling keySet() method 
    // which will return with Set.
    // Iterator object is pointed to keys of Set
    Iterator< String > iterator = propMap.keySet().iterator();
    // Looping across the elements of Iterator
    while(iterator.hasNext())
    {     
      // Creating a new row from the worksheet
      // at the last used row + 1 location
      HSSFRow rowOne = worksheet.createRow(worksheet.getLastRowNum()+1);
      // Creating two cells in the row at 0 and 1 position.
      HSSFCell cellZero = rowOne.createCell(0);
      HSSFCell cellOne = rowOne.createCell(1);
      // extracting key and value from the map and set
      String key = (String) iterator.next();
      String value = (String) propMap.get(key);
      // setting the extracted keys and values in the cells 
      cellZero.setCellValue(new HSSFRichTextString(key));
      cellOne.setCellValue(new HSSFRichTextString(value));
    }     
    try{
      FileOutputStream fosExcel =null;     
      // Creating a xls File
      File fileExcel = new File(excelPath);        
      // Setting the File to FileOutputStream
      fosExcel = new FileOutputStream(fileExcel);
      // Writing the contents of workbook to the xls
      workBook.write(fosExcel);
      // Flushing the FileOutputStream
      fosExcel.flush();
      // Closing the FileOutputStream
      fosExcel.close();
    }catch(Exception e){
      e.printStackTrace();
    }
  }
}

希望本文所述对大家的java程序设计有所帮助。



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