Loading a configuration file in the Web

Configuration in 1.web.xml

<!-- 加载配置文件 -->  <listener>     <description>ServletContextListener</description>     <listener-class>com.lanhetech.application.ContextInitListener</listener-class>   </listener>

2. Loading

importjava.io.FileInputStream;importjava.util.HashMap;import java.util.Map;importjava.util.Map.Entry;importjava.util.Properties;importjavax.servlet.ServletContext;importjavax.servlet.ServletContextEvent;importjavax.servlet.ServletContextListener;importorg.apache.log4j.Logger;// 加载配置文件到application中// test -- okpublicclassContextInitListener implementsServletContextListener {    privatestaticLogger logger = Logger.getLogger(ContextInitListener.class);    // web项目通常来说，一般来说相对路径是在/WEB-INF目录下    privatestaticfinalString BUSINESS_LOGIC_CONFIG_FILE_NAME = "business_logic.properties"; // 业务逻辑的配置文件名    @Override    publicvoidcontextDestroyed(ServletContextEvent arg0) {        logger.info("自定义加载配置文件监听器销毁！");    }    @Override    publicvoid contextInitialized(ServletContextEvent contextEvent) {        logger.info("自定义加载配置文件监听器初始化！");        // 1.装载配置文件        Map<String, String> configsMap = this.loadBusinessLogicConfig(contextEvent);        // 2.将配置加载到内存中Application        this.loadConfigToApplication(contextEvent, configsMap);        logger.info("自定义加载配置文件监听器初始化！完成！");    }    // 装载配置文件    private Map<String, String> loadBusinessLogicConfig(ServletContextEvent contextEvent) {        logger.info("开始装载配置文件！");        // 加载配置文件        Properties props = newProperties();        try{            String web_inf = contextEvent.getServletContext().getRealPath("/WEB-INF"); // 防止转义            String loadPath = web_inf + "//"+ BUSINESS_LOGIC_CONFIG_FILE_NAME;            logger.info("加载配置文件路径："+ loadPath);            props.load(newFileInputStream(loadPath));        } catch(Exception ex) {            logger.error("加载配置文件失败！！！！");            returnnull;        }        // 解析配置文件        Map<String, String> map = newHashMap<String, String>((Map) props);        logger.info("开始装载配置文件！完成！");        returnmap;    }    // 将配置加载到内存中Application    privatevoidloadConfigToApplication(ServletContextEvent contextEvent, Map<String, String> configsMap) {        logger.info("开始写入配置到内存中！");        if(configsMap == null) {            logger.error("配置参数为null，写入失败！！！");            return;        }        // 将配置文件里的值装入context属性,这样可以在JSP,SERVLET里调用        ServletContext context = contextEvent.getServletContext();        for(Entry<String, String> entry : configsMap.entrySet()) {            logger.info("写入的key："+ entry.getKey() + "  value："+ entry.getValue());            context.setAttribute(entry.getKey(), entry.getValue());        }        logger.info("开始写入配置到内存中！完成！");    }}

Used in 3.Spring:

WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();     ServletContext servletContext = webApplicationContext.getServletContext();         logger.info( "info获取请求：用户登录方法执行！" +  servletContext.getAttribute( "sm2_sign_ip" ));

Loading a configuration file in the Web