用java读写ini配置文件

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      http://www.blogjava.net/silvernapoleon/archive/2006/08/07/62222.html

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class ConfigWriter {     /**
    * 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
     */
    /**
    * 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("file://[//s*.*//s*//]");
                m = p.matcher((strLine));
                if(m.matches()) {
                    p = Pattern.compile("file://[//s* " + section + " file://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) {
        String fileContent, allLine, strLine, newLine, remarkStr;
        String getValue;
        BufferedReader bufferedReader = null;
        try {
            bufferedReader = new BufferedReader(new FileReader(file));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        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];                strLine = allLine.trim();
                Pattern p;
                Matcher m;
                p = Pattern.compile("file://[//s*.*//s*//]");
                m = p.matcher((strLine));                if(m.matches()) {
                    p = Pattern.compile("file://[//s*" + section + "file://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 ie) {
            ie.printStackTrace();
        } finally {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }        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);         System.out.println(ConfigWriter.setProfileString("d:/1.ini", "Settings", "SampSize", "111"));
    }
}