java獲取properties配置文件

2019-11-17 04:00:12

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來源：轉載

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package test.bwl;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.PRoperties;

public class Test {
    private static Properties properties = new Properties();

    public static void main(String[] args) {
        try {
            InputStream is = Test.class.getClassLoader().getResourceAsStream("cache.properties");
            properties.load(is);
            String size = properties.getProperty("cache.size");
            writeLog("配置成功！" + size);
        } catch (FileNotFoundException e) {
            writeLog("配置文件不存在！" + e.getMessage());
        } catch (IOException e) {
            writeLog("讀取配置文件IO錯誤！" + e.getMessage());
        }
    }

    public static void writeLog(String strLog) {
        System.out.println(strLog);
    }
}
package test.bwl;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class Test {
private static Properties properties = new Properties();

public static void main(String[] args) {
try {
InputStream is = Test.class.getClassLoader().getResourceAsStream("cache.properties");
properties.load(is);
String size = properties.getProperty("cache.size");
writeLog("配置成功！" + size);
} catch (FileNotFoundException e) {
writeLog("配置文件不存在！" + e.getMessage());
} catch (IOException e) {
writeLog("讀取配置文件IO錯誤！" + e.getMessage());
}
}

public static void writeLog(String strLog) {
System.out.println(strLog);
}
}



package test.bwl;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.regex.Pattern;

/**
* 配置信息管理器
*
* @author      bwl
* @version     1.0
*/
public class ConfigManager {

    /**
     * 提供單例對象的靜態內部類
     */
    private static class SingletonHolder {
        public static ConfigManager instance = new ConfigManager();
    }

    /**
     * 獲取對象實例
     * @return
     */
    public static ConfigManager getInstance() {
        return SingletonHolder.instance;
    }

    /**
     * 存儲問題列表的Map
     */
    private Map<String, Properties> name2properties;

    /**
     * 構造方法，請使用getInstance()獲取實例
     */
    private ConfigManager() {
        name2properties = Collections.synchronizedMap(new HashMap<String, Properties>());
        doInit();
    }

    /**
     * 初始化方法
     */
    private void doInit() {
        try {
            File path = new File("./conf/");
            if (!path.exists()) {
                System.out.println("ConfilgManager Init Error: There is no folder named 'conf' under src file.");
                return;
            }
            File[] confFiles = path.listFiles(new DirFilter(".*//.properties"));////
            for (int i = 0; i < confFiles.length; i++) {
                File f = confFiles[i];
                if (f.exists() && f.isFile()) {
                    Properties properties = new Properties();
                    InputStream is = new FileInputStream(f);
                    properties.load(is);
                    name2properties.put(f.getName(), properties);
                }
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 獲取配置項的值
     * @param fileName  配置文件的名稱
     * @param key       關鍵碼的值
     * @return  配置項
     */
    public String getProperty(String fileName, String key) {
        if (fileName == null || fileName.length() == 0) {
            return null;
        }
        Properties prop = name2properties.get(fileName);
        if (prop != null) {
            return prop.getProperty(key);
        }
        return null;
    }

    /**
     * 獲取整形的配置項的值
     * @param fileName  配置文件的名稱
     * @param keyName   關鍵碼的值
     * @return  如果正確則返回數字，否則返回-1
     */
    public int getIntProperty(String fileName, String key) {
        String value = this.getProperty(fileName, key);
        int result = -1;
        if (value == null) {
            return result;
        }
        try {
            result = Integer.parseInt(value);
            return result;
        } catch (Exception e) {
            //Do nothing
        }
        return result;
    }

    /**
     * 過濾屬性文件的內部類
     */
    class DirFilter implements FilenameFilter {

        /**
         * 記錄文件名格式的正則對象
         */
        private Pattern pattern;

        public DirFilter(String regex) {
            pattern = Pattern.compile(regex);
        }

        public boolean accept(File dir, String name) {
            return pattern.matcher(new File(name).getName()).matches();
        }

    }

    public static void main(String[] args) {
        ConfigManager config = ConfigManager.getInstance();
        System.out.println(config.getIntProperty("cache.properties", "cache.size") + "");
        System.out.println(config.getProperty("javagroups.properties", "bus_name") + "");
    }

}

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