java 读写 ini 配置文件

package org.fh.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URLDecoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 说明：ini文件读写操作工具类
 * 作者：FH Admin
 * from：fhadmin.cn
 */
public class IniFileUtil {

    /**
     * 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 readCfgValue(String file, String section, String variable, String defaultValue)
            throws IOException {
        String strLine, value = "";
        BufferedReader bufferedReader = new BufferedReader(new FileReader(URLDecoder.decode(file, "UTF-8"))); //解决中文路径乱码
        boolean isInSection = false;
        try {
            while ((strLine = bufferedReader.readLine()) != null) {
                strLine = strLine.trim();
                strLine = strLine.split("[;]")[0];
                Pattern p;
                Matcher m;
                p = Pattern.compile("\\[\\w+]");// Pattern.compile("file://[//s*.*//s*//]");
                m = p.matcher((strLine));
                if (m.matches()) {
                    p = Pattern.compile("\\[" + section + "\\]");// 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 writeCfgValue(String file, String section, String variable, String value) throws IOException {
        String fileContent, allLine, strLine, newLine;
        String getValue = null;
        BufferedReader bufferedReader = new BufferedReader(new FileReader(URLDecoder.decode(file, "UTF-8"))); //解决中文路径乱码
        boolean isInSection = false;
        boolean canAdd = true;
        fileContent = "";
        try {

            while ((allLine = bufferedReader.readLine()) != null) {
                allLine = allLine.trim();
                strLine = allLine.split(";")[0];
                Pattern p;
                Matcher m;
                p = Pattern.compile("\\[\\w+]");
                m = p.matcher((strLine));
                if (m.matches()) {
                    p = Pattern.compile("\\[" + section + "\\]");
                    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;
                        fileContent += newLine;
                        while ((allLine = bufferedReader.readLine()) != null) {
                            fileContent += "\r\n" + allLine;
                        }
                        bufferedReader.close();
                        canAdd = false;
                        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file, false));
                        bufferedWriter.write(fileContent);
                        bufferedWriter.flush();
                        bufferedWriter.close();

                        return true;
                    }

                }
                fileContent += allLine + "\r\n";
            }
            if (canAdd) {
                String str = variable + "=" + value;
                fileContent += str + "\r\n";
                BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file, false));
                bufferedWriter.write(fileContent);
                bufferedWriter.flush();
                bufferedWriter.close();
            }
        } catch (IOException ex) {
            throw ex;
        } finally {
            bufferedReader.close();
        }
        return false;
    }

    public static void main(String[] args) {
        try {
            /*;文件事例
            [Client]
            ;客户端版本号
            version=0001
            ;设备号
            devNum=6405*/
            String value = IniFileUtil.readCfgValue("L:/a.ini", "Client", "devNum", "1");
            System.out.println(value);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}