??? 在java中，配置文件一般主要是两种形式：xml文件或者property文件。但大部分人都习惯使用ini文件，而且ini文件的分节以及注释功能，比起xml，也是易懂易用的。
??? 在vc中类库中有读写ini文件的标准函数。在dephi或其他语言中，也可以用windows的api函数来读写ini文件。但在java中似乎没有现成的类和方法可供使用。虽然java可以通过加载dll文件的方法来调用windows的api，但总觉得不够正宗。
??? 于是自己写了个读写ini配置文件的类，供大家参考。
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;
/**
?* 这是个配置文件操作类，用来读取和设置ini配置文件
?* @author 由月
?* @version 2004-08-18
?*/
public final class ConfigurationFile {
?/**
? * 从ini配置文件中读取变量的值
? * @param file 配置文件的路径
? * @param section 要获取的变量所在段名称
? * @param variable 要获取的变量名称
? * @param defaultValue 变量名称不存在时的默认值
? * @return 变量的值
? * @throws IOException 抛出文件操作可能出现的io异常
? */
?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配置文件中变量的值
?* @param file 配置文件的路径
?* @param section 要修改的变量所在段名称
?* @param variable 要修改的变量名称
?* @param value 变量的新值
?* @throws IOException 抛出文件操作可能出现的io异常
?*/
?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 + "\r\n";
??????while ((allLine = bufferedReader.readLine()) != null) {
???????fileContent += allLine + "\r\n";
??????}
??????bufferedReader.close();
??????BufferedWriter bufferedWriter =
???????new BufferedWriter(new FileWriter(file, false));
??????bufferedWriter.write(fileContent);
??????bufferedWriter.flush();
??????bufferedWriter.close();
??????return true;
?????}
????}
????fileContent += allLine + "\r\n";
???}
??}catch(IOException ex){
???throw ex;
??} finally {
???bufferedReader.close();
??}
??return false;
?}
?/**
? * 程序测试
? */
?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());
??}
??
?}
}
这个类可以读和写ini文件，不过先说明一点：它识别ini文件中的“;”为注释符，而不是识别“#”为注释符。