JAVA操作properties文件的代码实例

JAVA操作properties文件的代码实例

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package cn.edu.hbcit.ips.util;  
/** 
* <p>Description: Properties文件操作</p> 
* 
* <p>Copyright: Copyright (c) 2009</p> 
* 
* <p>Company: </p> 
* 
* @author 作者 : ziyu 
* @version 创建时间：Feb 15, 2009 6:58:33 PM 
*/ 
import java.io.BufferedInputStream;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.OutputStream;  
import java.util.Enumeration;  
import java.util.Properties;  
public class OperateProperties {  
    public OperateProperties(){  
          
    }  
    //根据key读取value  
     public static String readValue(String filePath,String key) {  
      Properties props = new Properties();  
            try {  
             InputStream in = new BufferedInputStream (new FileInputStream(filePath));  
             props.load(in);  
             String value = props.getProperty (key);  
                System.out.println(key+value);  
                return value;  
            } catch (Exception e) {  
             e.printStackTrace();  
             return null;  
            }  
     }  
       
    //读取properties的全部信息  
        public static void readProperties(String filePath) {  
         Properties props = new Properties();  
            try {  
             InputStream in = new BufferedInputStream (new FileInputStream(filePath));  
             props.load(in);  
                Enumeration en = props.propertyNames();  
                 while (en.hasMoreElements()) {  
                  String key = (String) en.nextElement();  
                        String Property = props.getProperty (key);  
                        System.out.println(key+Property);  
                    }  
            } catch (Exception e) {  
             e.printStackTrace();  
            }  
        }  
          
      //写入properties信息  
        public static void writeProperties(String filePath,String parameterName,String parameterValue) {  
         Properties prop = new Properties();  
         try {  
          InputStream fis = new FileInputStream(filePath);  
                //从输入流中读取属性列表（键和元素对）  
                prop.load(fis);  
                //调用 Hashtable 的方法 put。使用 getProperty 方法提供并行性。  
                //强制要求为属性的键和值使用字符串。返回值是 Hashtable 调用 put 的结果。  
                OutputStream fos = new FileOutputStream(filePath);  
                prop.setProperty(parameterName, parameterValue);  
                //以适合使用 load 方法加载到 Properties 表中的格式，  
                //将此 Properties 表中的属性列表（键和元素对）写入输出流  
                prop.store(fos, "Update '" + parameterName + "' value");  
            } catch (IOException e) {  
             System.err.println("Visit "+filePath+" for updating "+parameterName+" value error");  
            }  
        }  
} 
package cn.edu.hbcit.ips.util;
/**
* <p>Description: Properties文件操作</p>
*
* <p>Copyright: Copyright (c) 2009</p>
*
* <p>Company: </p>
*
* @author 作者 : ziyu
* @version 创建时间：Feb 15, 2009 6:58:33 PM
*/
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Properties;
public class OperateProperties {
public OperateProperties(){

}
//根据key读取value
public static String readValue(String filePath,String key) {
  Properties props = new Properties();
        try {
         InputStream in = new BufferedInputStream (new FileInputStream(filePath));
         props.load(in);
         String value = props.getProperty (key);
            System.out.println(key+value);
            return value;
        } catch (Exception e) {
         e.printStackTrace();
         return null;
        }
}

//读取properties的全部信息
    public static void readProperties(String filePath) {
     Properties props = new Properties();
        try {
         InputStream in = new BufferedInputStream (new FileInputStream(filePath));
         props.load(in);
            Enumeration en = props.propertyNames();
             while (en.hasMoreElements()) {
              String key = (String) en.nextElement();
                    String Property = props.getProperty (key);
                    System.out.println(key+Property);
                }
        } catch (Exception e) {
         e.printStackTrace();
        }
    }
   
  //写入properties信息
    public static void writeProperties(String filePath,String parameterName,String parameterValue) {
     Properties prop = new Properties();
     try {
      InputStream fis = new FileInputStream(filePath);
            //从输入流中读取属性列表（键和元素对）
            prop.load(fis);
            //调用 Hashtable 的方法 put。使用 getProperty 方法提供并行性。
            //强制要求为属性的键和值使用字符串。返回值是 Hashtable 调用 put 的结果。
            OutputStream fos = new FileOutputStream(filePath);
            prop.setProperty(parameterName, parameterValue);
            //以适合使用 load 方法加载到 Properties 表中的格式，
            //将此 Properties 表中的属性列表（键和元素对）写入输出流
            prop.store(fos, "Update '" + parameterName + "' value");
        } catch (IOException e) {
         System.err.println("Visit "+filePath+" for updating "+parameterName+" value error");
        }
    }
}


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public static void main(String[] args) {  
     readValue("info.properties","url");  
        writeProperties("info.properties","age","21");  
        readProperties("info.properties" );  
        System.out.println("OK");  
}