1,全域性配置類

“JAVA中不應該有所謂全域性變數的概念，全域性變數嚴重影響了封裝和模組化，所以如果你的程式中需要所謂的全域性變數，那一定是你對程式的設計出了問題。”
這句話我也不太理解，但是覺得專案裡還是需要有所謂的全域性配置，全域性配置寫在配置檔案中，然後載入到專案裡

/**
 * Copyright &copy; 2015-2020 <a href="http://www.jeeplus.org/">JeePlus</a> All rights reserved.
 */
package com.jeeplus.common.config;

import java.io.File;
import
 
 java.io.FileOutputStream;
import java.io.IOException;
import java.io.Reader;
import java.util.Map;
import java.util.Properties;

import org.apache.ibatis.io.Resources;
import org.springframework.core.io.DefaultResourceLoader;

import com.ckfinder.connector.ServletContextFactory;
import com.google.common.collect.Maps;
import
 
 com.jeeplus.common.utils.PropertiesLoader;
import com.jeeplus.common.utils.StringUtils;

/**
 * 全域性配置類
 * @author jeeplus
 * @version 2014-06-25
 */
public class Global {

    /**
     * 當前物件例項
     */
    private static Global global = new Global();

    /*
     * 
     */
    public static String APP_CACHE="APPCACHE"
 
;

    public static String APP_CACHE_checkcode="APPCACHEcheckcode";

    //public static String APP_CACHE_phone="APPCACHEphone";

    public static String APP_TOKEN="APPTOKEN";

    public static String APP_SHORT_CACHE="APPSHORTCACHE";

    /**
     * 儲存全域性屬性值
     */
    private static Map<String, String> map = Maps.newHashMap();

    /**
     * 屬性檔案載入物件
     */
    private static PropertiesLoader loader = new PropertiesLoader("jeeplus.properties");

    /**
     * 顯示/隱藏
     */
    public static final String SHOW = "1";
    public static final String HIDE = "0";

    /**
     * 是/否
     */
    public static final String YES = "1";
    public static final String NO = "0";

    /**
     * 對/錯
     */
    public static final String TRUE = "true";
    public static final String FALSE = "false";

    /**
     * 上傳檔案基礎虛擬路徑
     */
    public static final String USERFILES_BASE_URL = "/userfiles/";

    /**
     * 獲取當前物件例項
     */
    public static Global getInstance() {
        return global;
    }

    /**
     * 獲取配置
     * @see ${fns:getConfig('adminPath')}
     */
    public static String getConfig(String key) {
        String value = map.get(key);
        if (value == null){
            value = loader.getProperty(key);
            map.put(key, value != null ? value : StringUtils.EMPTY);
        }
        return value;
    }

    /**
     * 獲取管理端根路徑
     */
    public static String getAdminPath() {
        return getConfig("adminPath");
    }

    /**
     * 獲取前端根路徑
     */
    public static String getFrontPath() {
        return getConfig("frontPath");
    }

    /**
     * 獲取URL字尾
     */
    public static String getUrlSuffix() {
        return getConfig("urlSuffix");
    }

    /**
     * 是否是演示模式，演示模式下不能修改使用者、角色、密碼、選單、授權
     */
    public static Boolean isDemoMode() {
        String dm = getConfig("demoMode");
        return "true".equals(dm) || "1".equals(dm);
    }

    /**
     * 在修改系統使用者和角色時是否同步到Activiti
     */
    public static Boolean isSynActivitiIndetity() {
        String dm = getConfig("activiti.isSynActivitiIndetity");
        return "true".equals(dm) || "1".equals(dm);
    }

    /**
     * 頁面獲取常量
     * @see ${fns:getConst('YES')}
     */
    public static Object getConst(String field) {
        try {
            return Global.class.getField(field).get(null);
        } catch (Exception e) {
            // 異常代表無配置，這裡什麼也不做
        }
        return null;
    }

    /**
     * 獲取上傳檔案的根目錄
     * @return
     */
    public static String getUserfilesBaseDir() {
        String dir = getConfig("userfiles.basedir");
        if (StringUtils.isBlank(dir)){
            try {
                dir = ServletContextFactory.getServletContext().getRealPath("/");
            } catch (Exception e) {
                return "";
            }
        }
        if(!dir.endsWith("/")) {
            dir += "/";
        }
//      System.out.println("userfiles.basedir: " + dir);
        return dir;
    }

    /**
     * 獲取工程路徑
     * @return
     */
    public static String getProjectPath(){
        // 如果配置了工程路徑，則直接返回，否則自動獲取。
        String projectPath = Global.getConfig("projectPath");
        if (StringUtils.isNotBlank(projectPath)){
            return projectPath;
        }
        try {
            File file = new DefaultResourceLoader().getResource("").getFile();
            if (file != null){
                while(true){
                    File f = new File(file.getPath() + File.separator + "src" + File.separator + "main");
                    if (f == null || f.exists()){
                        break;
                    }
                    if (file.getParentFile() != null){
                        file = file.getParentFile();
                    }else{
                        break;
                    }
                }
                projectPath = file.toString();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return projectPath;
    }

    /**
     * 寫入properties資訊
     * 
     * @param key
     *            名稱
     * @param value
     *            值
     */
    public static void modifyConfig(String key, String value) {
        try {
            // 從輸入流中讀取屬性列表（鍵和元素對）
            Properties prop = getProperties();
            prop.setProperty(key, value);
            String path = Global.class.getResource("/jeeplus.properties").getPath();
            FileOutputStream outputFile = new FileOutputStream(path);
            prop.store(outputFile, "modify");
            outputFile.close();
            outputFile.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 返回　Properties
     * @param fileName 檔名　(注意：載入的是src下的檔案,如果在某個包下．請把包名加上)
     * @param 
     * @return
     */
    public static Properties getProperties(){
        Properties prop = new Properties();
        try {
            Reader reader = Resources.getResourceAsReader("/jeeplus.properties");
            prop.load(reader);
        } catch (Exception e) {
            return null;
        }
        return prop;
    }


}

全域性配置檔案

jeeplus.properties配置檔案

#============================#
#===== Database sttings =====#
#============================#

#oracle database settings
#jdbc.type=oracle
#jdbc.driver=oracle.jdbc.driver.OracleDriver
#jdbc.url=jdbc:oracle:thin:@127.0.0.1:1521:jeeplus
#jdbc.username=liugf
#jdbc.password=fnst1234

#mysql database setting
jdbc.type=mysql
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.2.114:3306/jeeplus_schema?useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

#mssql database settings
#jdbc.type=mssql
#jdbc.driver=net.sourceforge.jtds.jdbc.Driver
#jdbc.url=jdbc:jtds:sqlserver://localhost:1433/jeeplus
#jdbc.username=sa
#jdbc.password=sa

#pool settings
jdbc.pool.init=1
jdbc.pool.minIdle=3
jdbc.pool.maxActive=20

#jdbc.testSql=SELECT 'x'
jdbc.testSql=SELECT 'x' FROM DUAL

#redis settings
redis.keyPrefix=jeeplus
redis.host=127.0.0.1
redis.port=6379

#============================#
#===== System settings ======#
#============================#

#\u4ea7\u54c1\u4fe1\u606f\u8bbe\u7f6e
productName=JeePlus \u5feb\u901f\u5f00\u53d1\u5e73\u53f0
copyrightYear=2014
version=V1.2.6

#\u6f14\u793a\u6a21\u5f0f: \u4e0d\u80fd\u64cd\u4f5c\u548c\u4fdd\u5b58\u7684\u6a21\u5757\uff1a sys: area/office/user/role/menu/dict, cms: site/category
demoMode=false

#\u7ba1\u7406\u57fa\u7840\u8def\u5f84, \u9700\u540c\u6b65\u4fee\u6539\uff1aweb.xml
adminPath=/a

#\u524d\u7aef\u57fa\u7840\u8def\u5f84
frontPath=/f

#\u7f51\u7ad9URL\u540e\u7f00
urlSuffix=.html

#\u662f\u5426\u4e0d\u5141\u8bb8\u5237\u65b0\u4e3b\u9875\uff0c\u4e0d\u5141\u8bb8\u60c5\u51b5\u4e0b\uff0c\u5237\u65b0\u4e3b\u9875\u4f1a\u5bfc\u81f4\u91cd\u65b0\u767b\u5f55
notAllowRefreshIndex=false

#\u662f\u5426\u5141\u8bb8\u591a\u8d26\u53f7\u540c\u65f6\u767b\u5f55
user.multiAccountLogin=true

#\u5206\u9875\u914d\u7f6e
page.pageSize=10

#\u7855\u6b63\u7ec4\u4ef6\u662f\u5426\u4f7f\u7528\u7f13\u5b58
supcan.useCache=false

#\u901a\u77e5\u95f4\u9694\u65f6\u95f4\u8bbe\u7f6e, \u5355\u4f4d\uff1a\u6beb\u79d2, 30s=30000ms, 60s=60000ms
oa.notify.remind.interval=60000

#============================#
#==== Framework settings ====#
#============================#

#\u4f1a\u8bdd\u8d85\u65f6\uff0c \u5355\u4f4d\uff1a\u6beb\u79d2\uff0c 20m=1200000ms, 30m=1800000ms, 60m=3600000ms
session.sessionTimeout=1800000
#\u4f1a\u8bdd\u6e05\u7406\u95f4\u9694\u65f6\u95f4\uff0c \u5355\u4f4d\uff1a\u6beb\u79d2\uff0c2m=120000ms\u3002
session.sessionTimeoutClean=120000

#\u7f13\u5b58\u8bbe\u7f6e
ehcache.configFile=cache/ehcache-local.xml
#ehcache.configFile=cache/ehcache-rmi.xml

#\u7d22\u5f15\u9875\u8def\u5f84
web.view.index=/a

#\u89c6\u56fe\u6587\u4ef6\u5b58\u653e\u8def\u5f84
web.view.prefix=/webpage/
web.view.suffix=.jsp

#\u6700\u5927\u6587\u4ef6\u4e0a\u4f20\u9650\u5236\uff0c\u5355\u4f4d\u5b57\u8282. 10M=10*1024*1024(B)=10485760 bytes\uff0c\u9700\u540c\u6b65\u4fee\u6539\uff1ackfinder.xml
web.maxUploadSize=10485760

#\u65e5\u5fd7\u62e6\u622a\u8bbe\u7f6e\uff0c\u6392\u9664\u7684URI\uff1b\u5305\u542b @RequestMapping\u6ce8\u89e3\u7684value\u3002\uff08\u5df2\u4f5c\u5e9f\uff09
#web.logInterceptExcludeUri=/, /login, /sys/menu/tree, /sys/menu/treeData, /oa/oaNotify/self/count
#web.logInterceptIncludeRequestMapping=save, delete, import, updateSort

#\u9759\u6001\u6587\u4ef6\u540e\u7f00
web.staticFile=.css,.js,.png,.jpg,.gif,.jpeg,.bmp,.ico,.swf,.psd,.htc,.htm,.html,.crx,.xpi,.exe,.ipa,.apk

#\u5355\u70b9\u767b\u5f55CAS\u8bbe\u7f6e
cas.server.url=http://127.0.0.1:8180/cas
cas.project.url=http://127.0.0.1:8080/jeeplus


#\u4e0a\u4f20\u6587\u4ef6\u7edd\u5bf9\u8def\u5f84, \u8def\u5f84\u4e2d\u4e0d\u5141\u8bb8\u5305\u542b\u201cuserfiles\u201d
#userfiles.basedir=D:/jeeplus

#\u5de5\u7a0b\u8def\u5f84\uff0c\u5728\u4ee3\u7801\u751f\u6210\u65f6\u83b7\u53d6\u4e0d\u5230\u5de5\u7a0b\u8def\u5f84\u65f6\uff0c\u53ef\u518d\u6b64\u6307\u5b9a\u7edd\u5bf9\u8def\u5f84\u3002
#projectPath=D\:\\workspace\\jeeplus

#
fromEmail=
toEmail=
emailName=
emailPassword=
cpu=100
jvm=100
ram=100

2,spring自帶注入方法

1. 配置檔案內容
   

2. spring使用方法
   

3. spring載入配置檔案