1.web.xml中配置
<!-- 加载配置文件 -->
<listener>
<description>ServletContextListener</description>
<listener-class>com.lanhetech.application.ContextInitListener</listener-class>
</listener>
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2.加载
import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.apache.log4j.Logger;
// 加载配置文件到application中// test -- okpublic class ContextInitListener implements ServletContextListener {
private static Logger 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
private static final String BUSINESS_LOGIC_CONFIG_FILE_NAME = "business_logic.properties"; // 业务逻辑的配置文件名
@Override
public void contextDestroyed(ServletContextEvent arg0) {
logger.info("自定义加载配置文件监听器销毁！");
}
@Override
public void 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 = new Properties();
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(new FileInputStream(loadPath));
} catch (Exception ex) {
logger.error("加载配置文件失败！！！！");
return null;
}
// 解析配置文件
Map<String, String> map = new HashMap<String, String>((Map) props);
logger.info("开始装载配置文件！完成！");
return map;
}
// 将配置加载到内存中Application
private void loadConfigToApplication(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！");
}
} |
3.Spring中使用：
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"));