注:本文来源于《java 网站用户在线和客服聊天》
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:
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代码部分:
用到了两个Action,分别为用户和管理员服务。
Struts.xml
<package name="chat" extends="struts-default,json-default"> <action name="chatMessageSend" class="com.shop.chat.MessageAction" method="send"> <result name="success" type="json">result> action> <action name="chatMessageGet" class="com.shop.chat.MessageAction"> <result type="json">result> action> <action name="adminMessageGet" class="com.shop.chat.AdminMessageAction"> <result name="success" type="json">result> action> <action name="adminMessageSend" class="com.shop.chat.AdminMessageAction" method="send"> <result type="json">result> action> <action name="adminList" class="com.shop.chat.AdminListAction"> <result type="json">result> action> package>
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 Listlist=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 ListgetList(){ 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 Listlist; 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 Listlist; 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 Listlist; //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 Listlist=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 ListgetMessage(){ //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 Listlist=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 ListgetList(){ 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; } }