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>