Java 读取配置文件Web方案

1.新建类SystemInit.java

public class SystemInit implements ServletContextListener
{
    /**
     * 日志
     */
    private static final Log log = LogFactory.getLog(SystemInit.class);
   
    /**
     * Servlet上下文
     */
    private ServletContext context;
   
    private static Configuration config;
   
    /**
     * 初始化方法
     */
    public void init()
    {
        log.info("Init System ...... ");
       
        try
        {

            // Constants.getAbsolutePath() == context.getRealPath("/")
            // config.properties路径（例：D:\Program Files\tomcat6.0\webapps\pc\WEB-INF\classes\config.properties）
            String configPath = context.getRealPath("/") + "WEB-INF"
                    + File.separator + "classes" + File.separator
                    + "config.properties";
           
            PropertiesConfiguration properties = new PropertiesConfiguration(
                    configPath);
           
            config = new Configuration(properties);
           
            // 初始化系统路径
            config.setContextPath(context.getContextPath());
           
            // 初始化绝对路径
            config.setAbsolutePath(context.getRealPath("/"));
        }
        catch (Exception ex)
        {
            log.error("System init fail catch Exception!", ex);
            throw new RuntimeException("System init fail,Exception "
                    + ex.getClass(), ex);
        }
       
        log.info("Init System end ...... ");
    }
   
    /**
     * 销毁上下文
     * @param servletcontextevent
     */
    public void contextDestroyed(ServletContextEvent servletcontextevent)
    {
       
    }
   
    /**
     * 初始化上下文
     * @param servletcontextevent
     */
    public void contextInitialized(ServletContextEvent servletcontextevent)
    {
        context = servletcontextevent.getServletContext();
       
        init();
    }
   
    /**
     * 读取配置
     * @return 配置
     */
    public static Configuration getConfig()
    {
        return config;
    }
   
    /**
     * 重新加载配置文件（对外调用提供更新）
     */
    public void reload()
    {
        init();
    }

}

2.新建Configuration.java

/**
 * config.properties配置数据对象
 *
 * @author  hpli/025415
 * @version  [版本号, 2012-3-19]
 * @see  [相关类/方法]
 * @since  [产品/模块版本]
 */
public class Configuration
{
    // context path
    private String contextPath = "";
   
    // 绝对路径
    private String absolutePath = "";
   
    // config配置Map集合
    private Map<String, String> configMap;
   
    public Configuration(PropertiesConfiguration properties)
    {
        // 初始化
        configMap = new HashMap<String, String>();
       
        // 获取config.properties所有key
        Iterator iterator = properties.getKeys();
       
        // 循环遍历设值
        while (iterator.hasNext())
        {
            String key = (String)iterator.next();
           
            configMap.put(key, properties.getString(key));
        }

    }
   
    public String getContextPath()
    {
        return contextPath;
    }
   
    public void setContextPath(String contextPath)
    {
        this.contextPath = contextPath;
    }
   
    public String getAbsolutePath()
    {
        return absolutePath;
    }
   
    public void setAbsolutePath(String absolutePath)
    {
        this.absolutePath = absolutePath;
    }

    public Map<String, String> getConfigMap()
    {
        return configMap;
    }

    public void setConfigMap(Map<String, String> configMap)
    {
        this.configMap = configMap;
    }
}

3.配置web.xml

添加监听

<listener>
  <listener-class>com.huawei.virest.common.SystemInit</listener-class>
</listener>