java使用POI讀取properties檔案並寫到Excel的方法_java

本文執行個體講述了java使用POI讀取properties檔案並寫到Excel的方法。分享給大家供大家參考。具體實現方法如下：

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();    }  }}

希望本文所述對大家的java程式設計有所協助。