在Java中，配置文件一般主要是兩種形式：XML文件或者property文件。但大部分人都習慣使用ini文件，而且ini文件的分節以及注釋功能，比起xml，也是易懂易用的。
在vc中類庫中有讀寫ini文件的標准函數。在dephi或其他語言中，也可以用windows的api函數來讀寫ini文件。但在java中似乎沒有現成的類和方法可供使用。雖然java可以通過加載dll文件的方法來調用windows的api，但總覺得不夠正宗。
於是自己寫了個讀寫ini配置文件的類，供大家參考。
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 這是個配置文件操作類，用來讀取和設置ini配置文件
* @author 由月
* @version 2004-08-18
*/
public final class ConfigurationFile {
/**
* 從ini配置文件中讀取變量的值
* @param file 配置文件的路徑
* @param section 要獲取的變量所在段名稱
* @param variable 要獲取的變量名稱
* @param defaultValue 變量名稱不存在時的默認值
* @return 變量的值
* @throws IOException 拋出文件操作可能出現的io異常
*/
public static String getProfileString(
String file,
String section,
String variable,
String defaultValue)
throws IOException {
String strLine, value = "";
BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
boolean isInSection = false;
try {
while ((strLine = bufferedReader.readLine()) != null) {
strLine = strLine.trim();
strLine = strLine.split("[;]")[0];
Pattern p;
Matcher m;
p = Pattern.compile("[s*.*s*]");
m = p.matcher((strLine));
if (m.matches()) {
p = Pattern.compile("[s*" + section + "s*]");
m = p.matcher(strLine);
if (m.matches()) {
isInSection = true;
} else {
isInSection = false;
}
}
if (isInSection == true) {
strLine = strLine.trim();
String[] strArray = strLine.split("=");
if (strArray.length == 1) {
value = strArray[0].trim();
if (value.equalsIgnoreCase(variable)) {
value = "";
return value;
}
} else if (strArray.length == 2) {
value = strArray[0].trim();
if (value.equalsIgnoreCase(variable)) {
value = strArray[1].trim();
return value;
}
} else if (strArray.length > 2) {
value = strArray[0].trim();
if (value.equalsIgnoreCase(variable)) {
value = strLine.substring(strLine.indexOf("=") + 1).trim();
return value;
}
}
}
}
} finally {
bufferedReader.close();
}
return defaultValue;
}
/**
* 修改ini配置文件中變量的值
* @param file 配置文件的路徑
* @param section 要修改的變量所在段名稱
* @param variable 要修改的變量名稱
* @param value 變量的新值
* @throws IOException 拋出文件操作可能出現的io異常
*/
public static boolean setProfileString(
String file,
String section,
String variable,
String value)
throws IOException {
String fileContent, allLine,strLine, newLine, remarkStr;
String getValue;
BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
boolean isInSection = false;
fileContent = "";
try {
while ((allLine = bufferedReader.readLine()) != null) {
allLine = allLine.trim();
if (allLine.split("[;]").length > 1)
remarkStr = ";" + allLine.split(";")[1];
else
remarkStr = "";
strLine = allLine.split(";")[0];
Pattern p;
Matcher m;
p = Pattern.compile("[s*.*s*]");
m = p.matcher((strLine));
if (m.matches()) {
p = Pattern.compile("[s*" + section + "s*]");
m = p.matcher(strLine);
if (m.matches()) {
isInSection = true;
} else {
isInSection = false;
}
}
if (isInSection == true) {
strLine = strLine.trim();
String[] strArray = strLine.split("=");
getValue = strArray[0].trim();
if (getValue.equalsIgnoreCase(variable)) {
newLine = getValue + " = " + value + " " + remarkStr;
fileContent += newLine + "
";
while ((allLine = bufferedReader.readLine()) != null) {
fileContent += allLine + "
";
}
bufferedReader.close();
BufferedWriter bufferedWriter =
new BufferedWriter(new FileWriter(file, false));
bufferedWriter.write(fileContent);
bufferedWriter.flush();
bufferedWriter.close();
return true;
}
}
fileContent += allLine + "
";
}
}catch(IOException ex){
throw ex;
} finally {
bufferedReader.close();
}
return false;
}
/**
* 程序測試
*/
public static void main(String[] args) {
//String value = Config.getProfileString("sysconfig.ini", "Option", "OracleDB", "default");
//System.out.println(value);
try {
System.out.println(ConfigurationFile.setProfileString("d:/1.ini", "Settings", "SampSize", "111"));
} catch (IOException e) {
System.out.println(e.toString());
}
}
}
