Java Code Examples for javax.servlet.ServletContext#getAttributeNames()

/**
 * Find all ServletContext attributes which implement {@link DisposableBean}
 * and destroy them, removing all affected ServletContext attributes eventually.
 * @param sc the ServletContext to check
 */
static void cleanupAttributes(ServletContext sc) {
	Enumeration<String> attrNames = sc.getAttributeNames();
	while (attrNames.hasMoreElements()) {
		String attrName = attrNames.nextElement();
		if (attrName.startsWith("org.springframework.")) {
			Object attrValue = sc.getAttribute(attrName);
			if (attrValue instanceof DisposableBean) {
				try {
					((DisposableBean) attrValue).destroy();
				}
				catch (Throwable ex) {
					logger.error("Couldn't invoke destroy method of attribute with name '" + attrName + "'", ex);
				}
			}
		}
	}
}
 

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
		throws ServletException, IOException {
	//从ServletContext对象中获取到Session信息
	ServletContext servletContext = this.getServletContext();
	
	//获取ServletContext域中所有的属性名
	Enumeration<String> names = servletContext.getAttributeNames();
	
	HttpSession session = req.getSession(false);
	String sessionName = "sessionID" + session.getId();
	
	if (session != null) {
		while (names.hasMoreElements()) {
			String name = names.nextElement();
			//System.out.println(name);
			if (name.equals(sessionName)) {
				HttpSession temp = (HttpSession) servletContext.getAttribute(name);
				System.out.println(temp.getAttribute("user"));
			}
		}
	}
}
 

/**
 * Find all ServletContext attributes which implement {@link DisposableBean}
 * and destroy them, removing all affected ServletContext attributes eventually.
 * @param sc the ServletContext to check
 */
static void cleanupAttributes(ServletContext sc) {
	Enumeration<String> attrNames = sc.getAttributeNames();
	while (attrNames.hasMoreElements()) {
		String attrName = attrNames.nextElement();
		if (attrName.startsWith("org.springframework.")) {
			Object attrValue = sc.getAttribute(attrName);
			if (attrValue instanceof DisposableBean) {
				try {
					((DisposableBean) attrValue).destroy();
				}
				catch (Throwable ex) {
					logger.error("Couldn't invoke destroy method of attribute with name '" + attrName + "'", ex);
				}
			}
		}
	}
}
 

/**
 * Find all ServletContext attributes which implement {@link DisposableBean}
 * and destroy them, removing all affected ServletContext attributes eventually.
 * @param sc the ServletContext to check
 */
static void cleanupAttributes(ServletContext sc) {
	Enumeration<String> attrNames = sc.getAttributeNames();
	while (attrNames.hasMoreElements()) {
		String attrName = attrNames.nextElement();
		if (attrName.startsWith("org.springframework.")) {
			Object attrValue = sc.getAttribute(attrName);
			if (attrValue instanceof DisposableBean) {
				try {
					((DisposableBean) attrValue).destroy();
				}
				catch (Throwable ex) {
					logger.error("Couldn't invoke destroy method of attribute with name '" + attrName + "'", ex);
				}
			}
		}
	}
}
 

/**
 *  销毁一个消费端 
 *  
 *     该方法  会通过传递的   ConsumerID 从 servletContext 查询 是否有 该对象 
 *     然后调用 其销毁方法 
 * 
 * @param ConsumerID    消费者唯一标识   
 * @return   
 */
@RequestMapping(method = RequestMethod.DELETE)
public ResponseEntity<String> destroyMqConsumer(@RequestParam("Consumer") String Consumer)
{

	ServletContext servletContext = request.getServletContext();

	Enumeration<String> attributeNames = servletContext.getAttributeNames();

	List<String> outList = new ArrayList<String>();

	Object AttributeConsumer = servletContext.getAttribute(Consumer);
	if (AttributeConsumer != null)
	{
		MqConsumer mqConsumer = (MqConsumer) AttributeConsumer;
		mqConsumer.destroy();
		servletContext.setAttribute(Consumer, null);

		return ResponseEntity.status(HttpStatus.OK).body(Consumer + " 消费者销毁成功");
	}

	return ResponseEntity.status(HttpStatus.NOT_FOUND).body(Consumer + " 未找到   该消费者 ");
}
 

/**
 * 获取servletContext 中存放的 所有  消费者对象 唯一标识 
 * 
 * @return  返回  说有消费者唯一标识  
 * 
 */
@RequestMapping(method = RequestMethod.GET)
public List<AttributeNames> queryMqConsumerList()
{
	ServletContext servletContext = request.getServletContext();
	List<AttributeNames> list = new ArrayList<AttributeNames>();
	Enumeration<String> attributeNames = servletContext.getAttributeNames();
	while (attributeNames.hasMoreElements())
	{
		String nameString = (String) attributeNames.nextElement();
		if (nameString.contains("@"))
		{
			AttributeNames attri = new AttributeNames();
			attri.setKid(nameString);
			list.add(attri);
		}
	}
	return list;
}
 

/**
 * Find all ServletContext attributes which implement {@link DisposableBean}
 * and destroy them, removing all affected ServletContext attributes eventually.
 * @param sc the ServletContext to check
 */
static void cleanupAttributes(ServletContext sc) {
	Enumeration<String> attrNames = sc.getAttributeNames();
	while (attrNames.hasMoreElements()) {
		String attrName = attrNames.nextElement();
		if (attrName.startsWith("org.springframework.")) {
			Object attrValue = sc.getAttribute(attrName);
			if (attrValue instanceof DisposableBean) {
				try {
					((DisposableBean) attrValue).destroy();
				}
				catch (Throwable ex) {
					logger.error("Couldn't invoke destroy method of attribute with name '" + attrName + "'", ex);
				}
			}
		}
	}
}
 

public static SysInfoCategory getContainerInfo(ServletContext context) {
    List<SysInfo> containerInfos = new ArrayList<SysInfo>();
    containerInfos.add(new SysInfo("Root path", context.getRealPath("/")));
    containerInfos.add(new SysInfo("Servlet container", context.getServerInfo()));
    containerInfos.add(new SysInfo("Servlet version", context.getMajorVersion() + "." + context.getMinorVersion()));
    containerInfos.add(new SysInfo("Servlet context", context.getServletContextName()));
    SysInfo attrInfo = new SysInfo("Attributes");
    Enumeration<?> attrNames = context.getAttributeNames();
    while (attrNames.hasMoreElements()) {
        String attrName = (String)attrNames.nextElement();
        if (!"org.apache.tomcat.util.scan.MergedWebXml".equals(attrName) && !"org.apache.catalina.jsp_classpath".equals(attrName))
        attrInfo.addSysInfo(new SysInfo(attrName, String.valueOf(context.getAttribute(attrName))));
    }
    containerInfos.add(attrInfo);
    return new SysInfoCategory("Container Details", containerInfos);
}
 

@Override
public void contextDestroyed(ServletContextEvent sce) {
    // Destroy any AtmosphereFramework instance we have initialized.
    // This must be done here to ensure that we cleanup Atmosphere instances
    // related to servlets which are never initialized
    ServletContext servletContext = sce.getServletContext();
    Enumeration<String> attributeNames = servletContext.getAttributeNames();
    while (attributeNames.hasMoreElements()) {
        String attributeName = attributeNames.nextElement();
        if (isAtmosphereFrameworkAttribute(attributeName)) {
            Object value = servletContext.getAttribute(attributeName);
            if (value instanceof AtmosphereFramework) {
                // This might result in calling destroy() twice, once from
                // here and once from PushRequestHandler but
                // AtmosphereFramework.destroy() deals with that
                ((AtmosphereFramework) value).destroy();
            }
        }
    }
}
 

/**
 * Find all ServletContext attributes which implement {@link DisposableBean}
 * and destroy them, removing all affected ServletContext attributes eventually.
 * @param sc the ServletContext to check
 */
private static void cleanupAttributes(ServletContext sc) {
	Enumeration<String> attrNames = sc.getAttributeNames();
	while (attrNames.hasMoreElements()) {
		String attrName = attrNames.nextElement();
		if (attrName.startsWith("org.springframework.")) {
			Object attrValue = sc.getAttribute(attrName);
			if (attrValue instanceof DisposableBean) {
				try {
					((DisposableBean) attrValue).destroy();
				}
				catch (Throwable ex) {
					log.error("Couldn't invoke destroy method of attribute with name '" + attrName + "'", ex);
				}
			}
		}
	}
}
 

@Override
public void contextDestroyed(ServletContextEvent sce) {
  log.info("ModelManagerListener destroying");
  // Slightly paranoid; remove objects from app scope manually
  ServletContext context = sce.getServletContext();
  for (Enumeration<String> names = context.getAttributeNames(); names.hasMoreElements();) {
    context.removeAttribute(names.nextElement());
  }

  close();

  // Hacky, but prevents Tomcat from complaining that ZK's cleanup thread 'leaked' since
  // it has a short sleep at its end
  try {
    Thread.sleep(1000);
  } catch (InterruptedException ie) {
    // continue
  }
}
 

/**
 * Find all ServletContext attributes which implement {@link DisposableBean}
 * and destroy them, removing all affected ServletContext attributes eventually.
 * @param sc the ServletContext to check
 */
private static void cleanupAttributes(ServletContext sc) {
	Enumeration<String> attrNames = sc.getAttributeNames();
	while (attrNames.hasMoreElements()) {
		String attrName = attrNames.nextElement();
		if (attrName.startsWith("org.springframework.")) {
			Object attrValue = sc.getAttribute(attrName);
			if (attrValue instanceof DisposableBean) {
				try {
					((DisposableBean) attrValue).destroy();
				}
				catch (Throwable ex) {
					log.error("Couldn't invoke destroy method of attribute with name '" + attrName + "'", ex);
				}
			}
		}
	}
}
 

@SuppressWarnings("unchecked")
@Override
public void service(final HttpServletRequest request, final HttpServletResponse response) throws IOException, ServletException {
	
	String accept = request.getHeader(Headers.ACCEPT) == null ? "text/plain" : request.getHeader(Headers.ACCEPT);
	
	if (accept.contains("html")) {
		
		request.setAttribute("page", "Overview");
		forwardTo(request, response, "info.vm");
		
	} else {

		PrintWriter out = response.getWriter();
		response.setContentType(MimeTypes.TEXT_PLAIN);

		ServletContext ctx = getServletContext();
		Store crdf = (Store) getServletContext().getAttribute(ConfigParams.STORE);

		out.println("Status: " + crdf.getStatus());

		for (Enumeration<String> e = ctx.getAttributeNames(); e.hasMoreElements();) {
			String attr = e.nextElement();
			out.println("Setting: attribute = " + attr + " @ value = " + ctx.getAttribute(attr));
		}

		out.close();
	}
}
 

private static void addAttributeMessages(ServletContext context,Map<String, Object> messages) {
	Enumeration<String> attributeNames = context.getAttributeNames();
	if(attributeNames==null || !attributeNames.hasMoreElements()) {
		return;
	}
	StringBuilder builder=new StringBuilder();
	while(attributeNames.hasMoreElements()) {
		String name = attributeNames.nextElement();
		buildAttributeMessage(builder,name,context.getAttribute(name));
	}
	addMessage(messages,"Attributes",builder.toString());
}
 

public static Set<String> init(final ServletContext context, final Set<String> existing) {
    if(existing != null) {
        return existing;
    }
    final Set<String> ret = new HashSet<String>();
    Enumeration names = context.getAttributeNames();
    while (names.hasMoreElements()) {
        ret.add((String) names.nextElement());
    }
    return ret;
}
 

/**
 * Clear any resteasy stuff from the context
 *
 * @param servletContext
 */
private void clearContext(final ServletContext servletContext, final Set<String> doNotClear) {
    final Enumeration names = servletContext.getAttributeNames();
    while (names.hasMoreElements()) {
        final String name = names.nextElement().toString();
        if (name.startsWith("org.jboss.resteasy") && !doNotClear.contains(name)) {
            servletContext.removeAttribute(name);
        }
    }
}
 

/**
    * Creates a Param[] of attributes from a Context
    */
   private Param[] recordContextAttributes(ServletContext context) {

if(debug) log("recordContextAttributes"); //NOI18N

Vector v = new Vector();
 
Enumeration e = context.getAttributeNames();
 
while (e.hasMoreElements()) {
    String name = (String)e.nextElement();
    if(debug) log(" name: " + name);  //NOI18N
    Object value = context.getAttribute(name);
           String valueRep = null;
           try {
               if(value == null) {
                   valueRep = ResourceBundle.getBundle("org.netbeans.modules.web.monitor.server.Bundle").getString("MON_Warning_attributes"); //NOI18N
               } else if (value.getClass().isArray()) {
                   Object[] valueItems = (Object[])value;
                   StringBuffer sb = new StringBuffer(valueItems.length * 16);
                   if (valueItems.length > 0) sb.append(valueItems[0]);
                   for(int i=1; i < valueItems.length; i++) {
                       sb.append(", "); // NOI18N
                       sb.append(valueItems[i]);
                   }
                   valueRep = sb.toString();
               } else {
                   valueRep = value.toString();
                   if (valueRep == null) {
                       valueRep = ResourceBundle.getBundle("org.netbeans.modules.web.monitor.server.Bundle").getString("MON_Warning_toString_null"); //NOI18N
                   }
               }
           } catch (Throwable t) {
               // Ensure that the monitor can continue to run even if there is a
               // serious problem in the application code that it is monitoring
               valueRep = ResourceBundle.getBundle("org.netbeans.modules.web.monitor.server.Bundle").getString("MON_Warning_toString_exception"); //NOI18N
           }
    Param p = new Param();
    p.setAttributeValue("name", name);  //NOI18N
    p.setAttributeValue("value", valueRep);  //NOI18N
    v.add(p);
}
int size = v.size();
Param[] params = new Param[size];
for(int i=0; i< size; ++i) 
    params[i] = (Param)v.elementAt(i);

return params;
   }
 

public static Enumeration<String> getAttributeNames(ServletContext container) { return (container != null) ? container.getAttributeNames() : null; }