property操作

property的一些读写修改操作

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import Java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Properties;
/**
 * 
 */
/**
 * @author lenovo
 *
 */
public class AcessTest {
 
 private static final String PROPERTY_FILE = "F:/program/data.properties";   
 /**  
 25.     * 根据Key 读取Value  
 26.     *   
 27.     * @param key  
 28.     * @return  
 29.     */  
  public String readData(String key) {   
         Properties props = new Properties();   
         try {   
             InputStream in = new BufferedInputStream(new FileInputStream(   
                     PROPERTY_FILE));   
             props.load(in);   
             in.close();   
             String value = props.getProperty(key);   
             return value;   
         } catch (Exception e) {   
             e.printStackTrace();   
             return null;   
         }   
     }   
  
        
    /**  
 .     * 修改或添加键值对 如果key存在，修改 反之，添加。  
 48.     *   
 49.     * @param key  
 50.     * @param value  
 51.     */  
    public void writeData(String key, String value) {   
        Properties prop = new Properties();   
        try {   
            File file = new File(PROPERTY_FILE);   
            if (!file.exists())   
                file.createNewFile();   
            InputStream fis = new FileInputStream(file);   
            prop.load(fis);   
            fis.close();//一定要在修改值之前关闭fis   
            OutputStream fos = new FileOutputStream(PROPERTY_FILE);   
            prop.setProperty(key, value);   
            prop.store(fos, "Update '" + key + "' value");   
            prop.store(fos, "just for test");   
            
            fos.close();   
        } catch (IOException e) {   
            System.err.println("Visit " + PROPERTY_FILE + " for updating "  
                    + value + " value error");   
        }
    }
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  AcessTest test = new AcessTest();
  test.writeData("name", "xiaozhang");
  test.writeData("sex", "male");
  
//  test.writeData("name", "xiaoyang");
  
  String name = test.readData("name");
  String sex = test.readData("sex");
  System.out.println("The name of the person is:" + name + ", and the sex is:" + sex);
 }

}
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zymm3221/archive/2010/10/11/5932400.aspx
property的一些读写修改操作

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