java读取.properties文件

　　　　在web开发过程中，有些配置要保存到properties文件里，本章将给出一个工具类，用来方便读取properties文件。

案例：

1：config.properties文件

name=\u843D\u82B1\u6709\u610F

str=\u6D41\u6C34\u65E0\u60C5

2：PropertiesUtil 类

package com.gcs.util;

import java.io.BufferedInputStream;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.Properties;

public class PropertiesUtil {

    private static String default_properties = "文件名.properties";

    private static Properties prop;

    static {

        prop = new Properties();

        try {

            InputStream is = new BufferedInputStream(new FileInputStream(getPath() + default_properties));

            prop.load(is);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    public static String getProperty(String key) {

        return prop.getProperty(key);

    }

    public static String getProperty(String key, String defaultValue) {

        String value = prop.getProperty(key);

        if (value == null)

            return defaultValue;

        return value;

    }

    public static boolean getBooleanProperty(String name, boolean defaultValue) {

        String value = prop.getProperty(name);

        if (value == null) return defaultValue;

        return (new Boolean(value)).booleanValue();

    }

    public static int getIntProperty(String name) {

        return getIntProperty(name, 0);

    }

    public static int getIntProperty(String name, int defaultValue) {

        String value = prop.getProperty(name);

        if (value == null) return defaultValue;

        return (new Integer(value)).intValue();

    }

    public static String getPath() {

        return Thread.currentThread().getContextClassLoader().getResource("").getPath();

    }

    /**

     * 读取指定properties中的值

     * @param properties  文件名

     * @param name  要读取的属性

     * @return

     */

    private String readProper(String properties, String name) {

        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(properties);

        Properties p = new Properties();

        try {

            p.load(inputStream);

        } catch (IOException e1) {

            e1.printStackTrace();

        }

        return p.getProperty(name);

    }

    public static void main(String[] args) {

        PropertiesUtil propertiesUtil = new PropertiesUtil();

        String name = PropertiesUtil.getProperty("name");

        String str = propertiesUtil.readProper("config.properties","str");

        System.out.println("name=="+name+","+"str=="+str);

    }

}