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这是应用到项目中的一个例子。

实现原理是将信息存储到Application域里面。然后使用Struts2 Action 用json格式的数据进行前后台交互。

截图：

前台用户界面：

后台客服界面：

编辑框采用的Ueditor 可以发送图片表情文字格式、涂鸦。。。。等等！功能十分的强大！

代码部分：

用到了两个Action，分别为用户和管理员服务。

Struts.xml

Java 类：

package com.shop.chat.admin;import java.util.ArrayList;import java.util.List;import com.shop.bean.Admin;/** * 存放当前已经登陆的管理员列表 * @author Pan * */public class AdminList {	private List
     
       list=new ArrayList
      
       ();	public AdminList(){	}	/**	 * 增加Admin对象	 * @param admin	 */	public void save(Admin admin){		if(list.indexOf(admin)==-1){			list.add(admin);		}	}	/**	 * 得到所有Admin	 * @return	 */	public List
       
         getList(){		return list;	}}
       
      
     

package com.shop.chat.admin;import java.util.List;import javax.servlet.ServletContext;import javax.servlet.http.HttpSession;import com.shop.bean.Admin;/** * admin列表服务 * @author Pan * */public class AdminListServler {	private AdminList list;	public AdminListServler(HttpSession session){		ServletContext context=session.getServletContext();		list=(AdminList)context.getAttribute("adminlist");		if(list==null){			list=new AdminList();			context.setAttribute("adminlist", list);		}	}	/**	 * add an admin to the list	 * @param admin	 */	public void save(Admin admin){		list.save(admin);	}	/**	 * get all admin object	 * @return arraylist	 */	public List
     
       getList(){		return list.getList();	}}
     

package com.shop.chat.admin;import java.sql.Timestamp;public class AdminSimplify {	private Integer id;	private String adminName;	private String adminPass;	private String nickName;	private String head;	private Timestamp addTime;	public Integer getId() {		return id;	}	public void setId(Integer id) {		this.id = id;	}	public String getAdminName() {		return adminName;	}	public void setAdminName(String adminName) {		this.adminName = adminName;	}	public String getAdminPass() {		return adminPass;	}	public void setAdminPass(String adminPass) {		this.adminPass = adminPass;	}	public String getNickName() {		return nickName;	}	public void setNickName(String nickName) {		this.nickName = nickName;	}	public String getHead() {		return head;	}	public void setHead(String head) {		this.head = head;	}	public Timestamp getAddTime() {		return addTime;	}	public void setAddTime(Timestamp addTime) {		this.addTime = addTime;	}}

package com.shop.chat;import java.util.ArrayList;import java.util.List;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;import com.shop.bean.Admin;import com.shop.chat.admin.AdminListServler;import com.shop.chat.admin.AdminSimplify;public class AdminListAction extends ActionSupport {	private List
     
       list;	public List
      
        getList() {		return list;	}	/**	 * 得到当前登陆的管理员	 * @return	 */	public String execute(){		list=new ArrayList
       
        ();		AdminListServler aServler=new AdminListServler(ServletActionContext.getRequest().getSession());		for (Admin admin : aServler.getList()) {			AdminSimplify as=new AdminSimplify();			as.setAddTime(admin.getAddTime());			as.setAdminName(admin.getAdminName());			as.setAdminPass(admin.getAdminPass());			as.setHead(admin.getHead());			as.setId(admin.getId());			as.setNickName(admin.getNickName());			list.add(as);		}		return SUCCESS;	}}
       
      
     

package com.shop.chat;import java.util.List;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;import com.shop.bean.Admin;public class AdminMessageAction extends ActionSupport {	private String to;		//接受用户	private String result;	//返回消息	private String content;	//消息内容	private String nickName;	//昵称	public void setNickName(String nickName) {		this.nickName = nickName;	}	public String getNickName() {		return nickName;	}	public void setContent(String content) {		this.content = content;	}	private List
     
       list;	public List
      
        getList() {		return list;	}	public void setResult(String result) {		this.result = result;	}	public String getResult() {		return result;	}	public void setTo(String to) {		this.to = to;	}	public String execute(){		Admin admin=(Admin)ServletActionContext.getRequest().getSession().getAttribute("admin");		if(admin==null){			setResult("你还没有登录！");			return SUCCESS;		}		MessageServer msServer=new MessageServer(ServletActionContext.getRequest().getSession(),admin.getId()+"",admin.getNickName());		list=msServer.getMessage();		return SUCCESS;	}	/**	 * 发送消息	 * @return	 */	public String send(){		Admin admin=(Admin)ServletActionContext.getRequest().getSession().getAttribute("admin");		if(admin==null){			setResult("没有登录");			return SUCCESS;		}		MessageServer msServer=new MessageServer(ServletActionContext.getRequest().getSession(), admin.getId()+"",admin.getNickName());		try {			msServer.send(to, content);			setResult("发送成功！");			setNickName(admin.getNickName());		} catch (Exception e) {			// TODO Auto-generated catch block			result=e.getMessage();		}		return SUCCESS;	}}
      
     

package com.shop.chat;/** * 信息容器 * @author Pan * */public class Message {	private String form; // 来自用户	private String to; // 接受用户	private String message; // 信息	private String nickName;	//昵称	public void setNickName(String nickName) {		this.nickName = nickName;	}	public String getNickName() {		return nickName;	}	public String getForm() {		return form;	}	public void setForm(String form) {		this.form = form;	}	public String getTo() {		return to;	}	public void setTo(String to) {		this.to = to;	}	public String getMessage() {		return message;	}	public void setMessage(String message) {		this.message = message;	}}

package com.shop.chat;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;import com.shop.bean.User;import com.sun.org.apache.bcel.internal.generic.NEW;public class MessageAction extends ActionSupport {	private String to;			//传送到指定的用户	private String result;		//返回信息	private String content;		//内容	private String nickName;	//昵称	private List
     
       list;	//消息集合	public void setNickName(String nickName) {		this.nickName = nickName;	}	public String getNickName() {		return nickName;	}	public void setResult(String result) {		this.result = result;	}	public void setContent(String content) {		this.content = content;	}	public List
      
        getList() {		return list;	}	public String getResult() {		return result;	}	public void setTo(String to) {		this.to = to;	}	/**	 * 获取消息	 */	public String execute(){		HttpServletRequest request=ServletActionContext.getRequest();		User user=(User)request.getSession().getAttribute("user");		MessageServer msServer=new MessageServer(request.getSession(), user.getId()+"",user.getNickName());		this.list=msServer.getMessage();		return SUCCESS;	}	/**	 * 发送消息	 * @return	 */	public String send(){		HttpServletRequest request=ServletActionContext.getRequest();		User user=(User)request.getSession().getAttribute("user");		if(user==null){			result="你还没有进行登录！";			return SUCCESS;		}		MessageServer mServer=new MessageServer(request.getSession(),user.getId()+"",user.getNickName());		mServer.getMessage();		try {			mServer.send(to, content);			System.out.println("to:"+to);			setNickName(user.getNickName());			setResult("发送成功");		} catch (Exception e) {			setResult("发送失败！");			result=e.getMessage();		}		return SUCCESS;	}}
      
     

package com.shop.chat;import java.util.ArrayList;import java.util.List;/** * 信息集合 这个对象储存到Application中 * @author Pan * */public class MessageList {	private List
     
       list=new ArrayList
      
       ();	public MessageList(){	}	/**	 * 添加信息	 * @param message	 */	public void add(Message message){		list.add(message);	}	/**	 * 寻找信息 通过接受的用户	 * @param uid	 * @return	 */	public List
       
         getByTo(String uid){		List
        
          tmp=new ArrayList
         
          ();		System.out.println("list的大小："+list.size());		for(Message message:list){			if(message.getTo().equals(uid)){				//添加到返回对象				tmp.add(message);			}		}		//然后移除信息 以免信息重复		list.removeAll(tmp);		return tmp;	}}
         
        
       
      
     

package com.shop.chat;import java.util.ArrayList;import java.util.List;import javax.servlet.ServletContext;import javax.servlet.http.HttpSession;public class MessageServer {	private MessageList mList;	private ServletContext context;	private String uid;	private String nickname;	public MessageServer(HttpSession session,String uid,String nickname){		this.context=session.getServletContext();		Object object=context.getAttribute("mlist");		if(object==null){			mList=new MessageList();			context.setAttribute("mlist", mList);		}else {			this.mList=(MessageList)object;		}		this.uid=uid;		this.nickname=nickname;	}	/**	 * 发送数据	 * @throws Exception	 */	public void send(String to,String content) throws Exception{		if(uid==null){			throw new Exception("用户名id无效");		}		Message message=new Message();		message.setForm(uid);		message.setTo(to);		message.setMessage(content);		message.setNickName(this.nickname);		mList.add(message);	}	/**	 * 接受信息	 * @return	 */	public List
     
       getMessage(){		//返回当前用户的信息		System.out.println("uid是："+uid);		return mList.getByTo(uid);	}}
     

package com.shop.chat.admin;import java.util.ArrayList;import java.util.List;import com.shop.bean.Admin;/** * 存放当前已经登陆的管理员列表 * @author Pan * */public class AdminList {	private List
     
       list=new ArrayList
      
       ();	public AdminList(){	}	/**	 * 增加Admin对象	 * @param admin	 */	public void save(Admin admin){		if(list.indexOf(admin)==-1){			list.add(admin);		}	}	/**	 * 得到所有Admin	 * @return	 */	public List
       
         getList(){		return list;	}}
       
      
     

package com.shop.chat.admin;import java.util.List;import javax.servlet.ServletContext;import javax.servlet.http.HttpSession;import com.shop.bean.Admin;/** * admin列表服务 * @author Pan * */public class AdminListServler {	private AdminList list;	public AdminListServler(HttpSession session){		ServletContext context=session.getServletContext();		list=(AdminList)context.getAttribute("adminlist");		if(list==null){			list=new AdminList();			context.setAttribute("adminlist", list);		}	}	/**	 * add an admin to the list	 * @param admin	 */	public void save(Admin admin){		list.save(admin);	}	/**	 * get all admin object	 * @return arraylist	 */	public List
     
       getList(){		return list.getList();	}}
     

package com.shop.chat.admin;import java.sql.Timestamp;public class AdminSimplify {	private Integer id;	private String adminName;	private String adminPass;	private String nickName;	private String head;	private Timestamp addTime;	public Integer getId() {		return id;	}	public void setId(Integer id) {		this.id = id;	}	public String getAdminName() {		return adminName;	}	public void setAdminName(String adminName) {		this.adminName = adminName;	}	public String getAdminPass() {		return adminPass;	}	public void setAdminPass(String adminPass) {		this.adminPass = adminPass;	}	public String getNickName() {		return nickName;	}	public void setNickName(String nickName) {		this.nickName = nickName;	}	public String getHead() {		return head;	}	public void setHead(String head) {		this.head = head;	}	public Timestamp getAddTime() {		return addTime;	}	public void setAddTime(Timestamp addTime) {		this.addTime = addTime;	}}