enoeht的Java源码系列(4)--继续处理配置文件

王朝java/jsp·作者佚名  2006-01-30
窄屏简体版  字體: |||超大  

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();

}

 
 
 
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