我们常常会在程序中用到这样的配置文件：
Listener = org.kyle.net.svr.sample.SampleListenerImpl
ServerAddress = 127.0.0.1
ListeningPort = 80
ListenerTimeout = 120
StatelessService = true
LogLevel = ALL
LogPath = server.log
在这里提供了一个处理这种配置文件的类的源代码。
package org.kyle.util;
import java.io.*;
import java.util.*;
//加载配置文件，并提供从配置文件中读取各种类型的值的方法
public class Profile
{
protected Properties applicationProps;
protected String m_configurationFilename = null;
private boolean m_debug = false;
public Profile( boolean debug)
{
this();
m_debug = debug;
}
public Profile()
{
this(System.getProperty("MainConfigFile","Server.cfg"));
}
public Profile(String configurationFilename)
{
this.m_configurationFilename = configurationFilename;
loadCfg(configurationFilename);
}
public void loadConfig(String configurationFilename)
{
if( configurationFilename == null )
{
System.exit(-1);
}
try {
applicationProps = new Properties();
FileInputStream in = new FileInputStream(configurationFilename);
applicationProps.load(in);
in.close();
}
catch( IOException ie)
{
System.exit(-1);
}
}
public void loadConfig()
{
loadConfig( m_configurationFilename );
}
public void saveConfig()
{
try
{
FileOutputStream out = new FileOutputStream(m_configurationFilename);
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out, "8859_1"));
synchronized (applicationProps)
{
Iterator iterator = new TreeSet(applicationProps.keySet()).iterator();
while(iterator.hasNext())
{
String key = (String)iterator.next();
writer.write(key + "=" + applicationProps.getProperty(key));
writer.newLine();
}
}
writer.close();
out.close();
}catch(IOException ie)
{
System.out.println(ie.toString());
}
}
public void showConfig()
{
applicationProps.list(System.out);
}
public Properties getProperty()
{
return applicationProps;
}
String getString(String Section, String key, String Default)
{
return getString( key, Default);
}
public String getString(String key, String Default)
{
String rVal = applicationProps.getProperty(key, Default);
return rVal == null ? rVal : rVal.trim();
}
public String getString(String key)
{
String rVal = applicationProps.getProperty(key);
return rVal == null ? rVal : rVal.trim();
}
public boolean getBoolean(String key, boolean Default)
{
String rVal = getString(key);
// if (rVal == null) return Default;
if ("true".equalsIgnoreCase(rVal)) return true;
if ("false".equalsIgnoreCase(rVal)) return false;
return Default;
}
public int getInt(String key, int Default)
{
try{
return getInt(key);
}catch(Exception e){
applicationProps.setProperty(key, String.valueOf(Default));
return Default;
}
}
protected int getInt(String key) throws NumberFormatException
{
String rVal = getString(key);
return Integer.parseInt(rVal);
}
public String getConfigurationFilename()
{
return m_configurationFilename;
}
private void loadCfg(String configurationFilename)
{
if( configurationFilename == null )
{
System.out.println("Assigned a null configuration file. Default setting used.");
}
try
{
applicationProps = new Properties();
FileInputStream in = new FileInputStream(configurationFilename);
applicationProps.load(in);
in.close();
}
catch( IOException ioe)
{
System.out.println("Loading configuration from file " + configurationFilename + " failed.");
System.out.println("Default setting will be used.");
}
}
}
package org.kyle.util;
import java.net.*;
//调用父类加载配置文件和读取数据，按照配置文件的中的key值读取其value。
public class GenProfile extends Profile
{
public GenProfile()
{
super();
buildCachedCrypt();
}
public GenProfile( String cfgFileName )
{
super( cfgFileName );
buildCachedCrypt();
}
public String getListenerImpl()
{
return getString("Listener", " org.kyle.net.svr.sample.SampleListenerImpl");
}
public InetAddress getServerAddress()
{
try
{
String svrAddr = getString("ServerAddress",null);
if ( svrAddr == null ) return null;
return InetAddress.getByName( svrAddr );
}
catch( UnknownHostException uhe)
{
Debug.info(uhe);
}
return null;
}
public int getListenAt()
{
return getInt("ListeningPort", 80);
}
public int getTimeout()
{
return getInt("ListenerTimeout", 120);
}
public boolean statelessService()
{
return getBoolean("StatelessService", true );
}
public String getLogLevel()
{
return getString("LogLevel","CONFIG");
}
public String getLogPath()
{
return getString("LogPath","server.log");
}
}
使用方法：
String cfgFile ="server.cfg";
GenProfile m_env = new GenProfile( cfgFile );
这样在程序中就可以使用例如m_env. getServerAddress()等方法取得配置文件的相应内容了。