messagemanage.java

《jsp编程起步》里面的所有源代码

package chat;
import java.util.*;
public class MessageManage{
    public Message newMessage(String fromWho,String fromWhere,String Statement,String toWho,String Property){
        Message message=new Message();
        message.fromWho=fromWho;
        message.fromWhere=fromWhere;
        message.Statement=Statement;
        message.toWho=toWho;
        message.Property=Property;
        return message;
    }
    public int addMessage(Message message,Vector MessageTable){
          MessageTable.add(message);
          return 1;
    }
    public String getRecentMessage(String ID,Vector MessageTable){
          Message message=new Message();
          String msg=new String();
          Enumeration e;

        if(MessageTable.isEmpty())return null;
          else {
                    for(int j=MessageTable.size();j>0;j--){
                          message=(Message)MessageTable.elementAt(j-1);
                          if(message.toWho.equals(ID)||message.fromWho.equals(ID)){
                                msg=message.fromWho+message.Statement;
                          }
                     }
                     return msg;
          }

      }

      public Vector getRecentMessages(String ID,Vector MessageTable){
          final int MAX=15;
          Message message=new Message();
          String msg=new String();
          Vector v=new Vector(MAX);

          if(MessageTable.isEmpty())return null;
          else {
                    for(int j=MessageTable.size();j>0;j--){
                          message=(Message)MessageTable.elementAt(j-1);
                          if(message.toWho.equals(ID)||message.fromWho.equals(ID)||message.toWho.equals("")||message.toWho.equals("All")){
                                if(message.toWho.equals("")||message.toWho.equals("All")){
                                        
                                        msg=message.fromWho+" : "+message.Statement;
                                }else{
                                      
                                        msg=message.fromWho+"对"+message.toWho+" : "+message.Statement;
                                };

                                v.add(msg);
                          }
                     }

                     if(v.size()>MAX){
                              return new Vector(v.subList(0,MAX));
                     }
                     else return v;

              }//else
      }

}