Java的Properties文件操作类

浅浅的花香味﹌ 2022-06-10 08:24 237阅读 0赞

package cn.edu.hbcit.util;  
    /**  
     * <p>Description: Properties文件操作</p>  
     *  
     * <p>Copyright: Copyright (c) 2009</p>  
     *  
     */    
    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));  
                    InputStream in = OperateProperties.class.getResourceAsStream(filePath);  
                    props.load(in);  
                    String value = props.getProperty (key);  
                    System.out.println("key:"+key+"   "+"value:"+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");  
                }  
            }  
      
    }