读，写，操作Properties属性文件

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.InvalidPropertiesFormatException;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;

public class RWProperties ...{

    public RWProperties() ...{
        // TODO Auto-generated constructor stub
    }
    
//读属性文件
    private static Properties readProperties()...{
        Properties prop = new Properties();
         FileInputStream finps = null;
        try ...{
            finps = new FileInputStream("g:/DB.properties");
            prop.load(finps);
        } catch (Exception e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally ...{
            try ...{
                finps.close();
            } catch (IOException e) ...{
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return prop;
//         prop.list(System.out);
       }
    
    private static void writerProperties()...{
        FileOutputStream fouts = null;
         Properties prop = new Properties(RWProperties.readProperties());//在原属性文件上追加记录
         Properties prop = new Properties();//写新的属性文件

         prop.setProperty("dsssssssssssss0","caaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
         prop.setProperty("url","jdbc:sqlserver://localhost:1433;databasename=pubs");
         prop.setProperty("user","sa");
         prop.setProperty("pwd","sa");
         
         try ...{
             fouts = new FileOutputStream("g:/DB.properties");
            prop.store(fouts, "DB");
        } catch (IOException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally ...{
            try ...{
                fouts.close();
            } catch (IOException e) ...{
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
    //生成XML格式的属性文件
    private static void writerPropertiesXml()...{
        FileOutputStream fouts = null;
         Properties prop = new Properties();
         prop.setProperty("driver0","com.microsoft.jdbc.sqlserver.SQLServerDriver");
         prop.setProperty("driver1","sun.jdbc.odbc.JdbcOdbcDriver");
         prop.setProperty("driver","com.microsoft.sqlserver.jdbc.SQLServerDriver");
         prop.setProperty("url0","jdbc:microsoft:sqlserver://localhost:1433;databasename=PersonnelManagement");
         prop.setProperty("url1","jdbc:odbc:PersonnelManagement");
         prop.setProperty("url","jdbc:sqlserver://localhost:1433;databasename=pubs");
         prop.setProperty("user","sa");
         prop.setProperty("pwd","sa");
         
         try ...{
             fouts = new FileOutputStream("g:/DB.xml");
            prop.storeToXML(fouts, "DB");
        } catch (IOException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally ...{
            try ...{
                fouts.close();
            } catch (IOException e) ...{
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
    public static void main(String[] args)...{
//        RWProperties.readProperties();
        RWProperties.writerProperties();
//        RWProperties.writerPropertiesXml();
    }

}