我们还常常会在程序中用到这样的配置文件：
[section]
key = value
下面是一个这种配置文件中的实例
[Server]
Address=192.168.1.151
Port=8000
Version=1
Info=1
[User]
Name=Kyle
Pwd=1234
[ID]
111;222;333
[END]
在这里提供了一个处理这种结构的配置文件的类的源代码：
package org.kyle.util;
import java.util.*;
import java.io.*;
public class CfgArea
{
char m_start, m_end;
String m_commentTag = "#"; //配置文件中#开头的是注释
String m_valueDelim = null;
String m_areaName = null;
HashMap m_content = new HashMap();
String m_nextName = null;
public CfgArea(char areaTagStart, char areaTagEnd)
{
this( areaTagStart, areaTagEnd, null );
}
public void reset()
{
m_areaName = m_nextName;
m_nextName = null;
m_content.clear();
}
public CfgArea(char areaTagStart, char areaTagEnd, String cTag)
{
m_start = areaTagStart;
m_end = areaTagEnd;
if ( cTag != null ) m_commentTag = cTag;
}
public void setValueDelim( String vDlm )
{
m_valueDelim = vDlm;
}
public String getName()
{
return m_areaName;
}
public String getValue( String sKey )
{
return (String)m_content.get( sKey );
}
public Set getKeys()
{
return m_content.keySet();
}
public boolean readArea( BufferedReader br)
{
try
{
String aLine = null;
while( (aLine = readCfgLine( br ) ) != null )
{
if ( aLine.trim().equals("") ) continue;
if ( m_areaName == null )
{
m_areaName = getAreaName( aLine );
if ( m_areaName == null ) return false;
continue;
}
else
{
if ( restoreTag( aLine ) ) return true;
}
if ( m_valueDelim != null )
{
addKeys( aLine, m_valueDelim );
}
else
addKeyPair( aLine );
}
//System.out.println( m_content );
return aLine != null;
}
catch( Exception e)
{
Debug.warning("readArea exception in Class CfgArea");
}
return false;
}
private String readCfgLine( BufferedReader theReader )
throws IOException
{
String aLine = null;
do{
aLine = theReader.readLine();
}while( aLine !=null && (aLine.trim().equals("") || aLine.trim().startsWith( m_commentTag ) ) );
return aLine == null ? null : aLine.trim();
}
private boolean isAreaTag( String aLine )
{
char[] lineChars = aLine.toCharArray();
return lineChars[0] == m_start && lineChars[ lineChars.length - 1 ] == m_end ;
}
private String getAreaName( String aLine )
{
if ( !isAreaTag( aLine ) ) return null;
StringBuffer sb = new StringBuffer( aLine );
sb.deleteCharAt( 0 );
sb.deleteCharAt( sb.length() - 1 );
return sb.toString();
}
private void addKeyPair( String aLine )
{
StringTokenizer st = new StringTokenizer( aLine, "=" );
String sKey = null, sVal = null;
if( st.hasMoreTokens() )
sKey = st.nextToken();
if( st.hasMoreTokens() )
sVal = st.nextToken();
if ( sKey == null ) return;
m_content.put( sKey, sVal );
}
private void addKeys( String aLine, String delim )
{
StringTokenizer st = new StringTokenizer( aLine, delim );
String sKey = null;
while( st.hasMoreTokens() )
{
sKey = st.nextToken();
m_content.put( sKey, m_areaName );
}
}
private boolean restoreTag( String areaTag)
throws IOException
{
if ( !isAreaTag( areaTag ) ) return false;
m_nextName = getAreaName( areaTag );
return true;
}
}
下面我们来看这个类怎么用：
private static Hashtable properties = new Hashtable();
try {
BufferedReader pbr = new BufferedReader(new InputStreamReader(new
FileInputStream("Property.cfg")));
CfgArea ca = new CfgArea('[', ']'); //除了用[]来标识section，还可以用其他字符呦。
ca.readArea(pbr);
Hashtable H1 = new Hashtable();
H1.put("ServerName", ca.getName());
H1.put("Address", ca.getValue("Address"));
H1.put("Port", ca.getValue("Port"));
properties.put(ca.getName(), H1);
ca.reset();
//开始读下一个section
ca.readArea(pbr);
Hashtable H2 = new Hashtable();
H2.put("User", ca.getName());
H2.put("Name", ca.getValue("Name"));
H2.put("Pwd", ca.getValue("Pwd"));
properties.put(ca.getName(), H2);
ca.reset();
//第三个section与前两个有些不同，可以把他看成只有key。
ca.setValueDelim(";"); //key中是由;号分隔的
ca.readArea(pbr);
Hashtable H3 = new Hashtable();
Iterator iKey = ca.getKeys().iterator();
while (iKey.hasNext()) {
H3.put( (String) iKey.next(), ca.getName());
}
properties.put(ca.getName(), H3);
ca.reset();
pbr.close();
}
catch (Exception e) {
properties.clear();
e.printStackTrace();
}
