contexthelper.java

jsf在线考试系统的实例

package com.jlobo.common;

import java.text.SimpleDateFormat;
import java.util.Date;

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;

import com.jlobo.identity.User;
import com.jlobo.web.views.UserBean;

public class ContextHelper {
	public static long getId(String parameterName) {
		long value = -100;
		String valueText = (String) FacesContext.getCurrentInstance()
				.getExternalContext().getRequestParameterMap().get(
						parameterName);
		try {
			value = Long.parseLong(valueText);
		} catch (NumberFormatException e) {
			value = -1000;
		}
		return value;
	}

	public static void addMessage(String msg) {
		FacesContext.getCurrentInstance().addMessage(null,
				new FacesMessage(msg));

	}

	public static void setSessionAttribute(String key, Object value) {
		FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put(key, value);
	}

	public static Object getSessionAttribute(String key) {
		return FacesContext.getCurrentInstance().getExternalContext()
				.getSessionMap().get(key);
	}

	public static void removeSessionAttribute(String key) {
		FacesContext.getCurrentInstance().getExternalContext().getSessionMap()
				.remove(key);
	}

	public static String getParameter(String name) {
		return (String) FacesContext.getCurrentInstance().getExternalContext()
				.getRequestParameterMap().get(name);
	}

	public static String getActorId() {
		String actorId = null;
		UserBean userBean = (UserBean) FacesContext.getCurrentInstance()
				.getExternalContext().getSessionMap().get("userBean");
		if (userBean != null && userBean.getUser() != null
				&& userBean.getUser().getName() != null) {
			actorId = userBean.getUser().getName();
		}
		return actorId;
	}
	
	public static User getUser() {
		User user = null;
		UserBean userBean = (UserBean) FacesContext.getCurrentInstance()
				.getExternalContext().getSessionMap().get("userBean");
		if (userBean != null && userBean.getUser() != null
				&& userBean.getUser().getAccount() != null) {
			user = userBean.getUser();
		}
		return user;
	}
	
	public static UserBean getUserBean() {
		return (UserBean) FacesContext.getCurrentInstance()
				.getExternalContext().getSessionMap().get("userBean");
	}

	public static String dateToString(Date time) {
		try {
			SimpleDateFormat formatter;
			formatter = new SimpleDateFormat("yyyy-MM-dd");
			String ctime = formatter.format(time);

			return ctime;
		} catch (Exception e) {
			return "null";

		}

	}

	public static boolean isFind(String query, String result) {
		if(result != null){
			String[] find = result.split(",");
			boolean finded = false;
			for (int i = 0; i < find.length; i++) {
				if (query.equals(find[i])) {
					finded = true;
					break;
				}
			}
			return finded;
		} else 
			return false;
	}

	
}