java项目中的全局变量

来源：互联网发布：二环十三郎知乎编辑：程序博客网时间：2024/05/22 04:52

1,全局配置类

“JAVA中不应该有所谓全局变量的概念，全局变量严重影响了封装和模块化，所以如果你的程序中需要所谓的全局变量，那一定是你对程序的设计出了问题。”
这句话我也不太理解，但是觉得项目里还是需要有所谓的全局配置，全局配置写在配置文件中，然后加载到项目里

/** * 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;/** * 全局配置类 * @author jeeplus * @version 2014-06-25 */public class Global {    /**     * 当前对象实例     */    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";    /**     * 保存全局属性值     */    private static Map<String, String> map = Maps.newHashMap();    /**     * 属性文件加载对象     */    private static PropertiesLoader loader = new PropertiesLoader("jeeplus.properties");    /**     * 显示/隐藏     */    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";    /**     * 对/错     */    public static final String TRUE = "true";    public static final String FALSE = "false";    /**     * 上传文件基础虚拟路径     */    public static final String USERFILES_BASE_URL = "/userfiles/";    /**     * 获取当前对象实例     */    public static Global getInstance() {        return global;    }    /**     * 获取配置     * @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;    }    /**     * 获取管理端根路径     */    public static String getAdminPath() {        return getConfig("adminPath");    }    /**     * 获取前端根路径     */    public static String getFrontPath() {        return getConfig("frontPath");    }    /**     * 获取URL后缀     */    public static String getUrlSuffix() {        return getConfig("urlSuffix");    }    /**     * 是否是演示模式，演示模式下不能修改用户、角色、密码、菜单、授权     */    public static Boolean isDemoMode() {        String dm = getConfig("demoMode");        return "true".equals(dm) || "1".equals(dm);    }    /**     * 在修改系统用户和角色时是否同步到Activiti     */    public static Boolean isSynActivitiIndetity() {        String dm = getConfig("activiti.isSynActivitiIndetity");        return "true".equals(dm) || "1".equals(dm);    }    /**     * 页面获取常量     * @see ${fns:getConst('YES')}     */    public static Object getConst(String field) {        try {            return Global.class.getField(field).get(null);        } catch (Exception e) {            // 异常代表无配置，这里什么也不做        }        return null;    }    /**     * 获取上传文件的根目录     * @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;    }    /**     * 获取工程路径     * @return     */    public static String getProjectPath(){        // 如果配置了工程路径，则直接返回，否则自动获取。        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;    }    /**     * 写入properties信息     *      * @param key     *            名称     * @param value     *            值     */    public static void modifyConfig(String key, String value) {        try {            // 从输入流中读取属性列表（键和元素对）            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 文件名　(注意：加载的是src下的文件,如果在某个包下．请把包名加上)     * @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;    }}

全局配置文件

jeeplus.properties配置文件

#============================##===== 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 settingjdbc.type=mysqljdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://192.168.2.114:3306/jeeplus_schema?useUnicode=true&characterEncoding=utf-8jdbc.username=rootjdbc.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 settingsjdbc.pool.init=1jdbc.pool.minIdle=3jdbc.pool.maxActive=20#jdbc.testSql=SELECT 'x'jdbc.testSql=SELECT 'x' FROM DUAL#redis settingsredis.keyPrefix=jeeplusredis.host=127.0.0.1redis.port=6379#============================##===== System settings ======##============================##\u4ea7\u54c1\u4fe1\u606f\u8bbe\u7f6eproductName=JeePlus \u5feb\u901f\u5f00\u53d1\u5e73\u53f0copyrightYear=2014version=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/categorydemoMode=false#\u7ba1\u7406\u57fa\u7840\u8def\u5f84, \u9700\u540c\u6b65\u4fee\u6539\uff1aweb.xmladminPath=/a#\u524d\u7aef\u57fa\u7840\u8def\u5f84frontPath=/f#\u7f51\u7ad9URL\u540e\u7f00urlSuffix=.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\u5f55notAllowRefreshIndex=false#\u662f\u5426\u5141\u8bb8\u591a\u8d26\u53f7\u540c\u65f6\u767b\u5f55user.multiAccountLogin=true#\u5206\u9875\u914d\u7f6epage.pageSize=10#\u7855\u6b63\u7ec4\u4ef6\u662f\u5426\u4f7f\u7528\u7f13\u5b58supcan.useCache=false#\u901a\u77e5\u95f4\u9694\u65f6\u95f4\u8bbe\u7f6e, \u5355\u4f4d\uff1a\u6beb\u79d2, 30s=30000ms, 60s=60000msoa.notify.remind.interval=60000#============================##==== Framework settings ====##============================##\u4f1a\u8bdd\u8d85\u65f6\uff0c \u5355\u4f4d\uff1a\u6beb\u79d2\uff0c 20m=1200000ms, 30m=1800000ms, 60m=3600000mssession.sessionTimeout=1800000#\u4f1a\u8bdd\u6e05\u7406\u95f4\u9694\u65f6\u95f4\uff0c \u5355\u4f4d\uff1a\u6beb\u79d2\uff0c2m=120000ms\u3002session.sessionTimeoutClean=120000#\u7f13\u5b58\u8bbe\u7f6eehcache.configFile=cache/ehcache-local.xml#ehcache.configFile=cache/ehcache-rmi.xml#\u7d22\u5f15\u9875\u8def\u5f84web.view.index=/a#\u89c6\u56fe\u6587\u4ef6\u5b58\u653e\u8def\u5f84web.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.xmlweb.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\u7f00web.staticFile=.css,.js,.png,.jpg,.gif,.jpeg,.bmp,.ico,.swf,.psd,.htc,.htm,.html,.crx,.xpi,.exe,.ipa,.apk#\u5355\u70b9\u767b\u5f55CAS\u8bbe\u7f6ecas.server.url=http://127.0.0.1:8180/cascas.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=100jvm=100ram=100

2,spring自带注入方法

配置文件内容
spring使用方法
spring加载配置文件

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