Java语言程序设计教学课程设计项目——蓝梦集团即时通讯(IM)系统实现(第3部分)

1.1Java语言程序设计教学课程设计项目——蓝梦集团即时通讯（IM）系统实现（第3部分）5、系统中的数据包装的各种实体类模块（valueobject）（1）为什么要提供该模块将系统中的各种类型的数据封装（2）最终的结果（3）ClientInfoListObjects类的代码示例package com.px1987.imsystem.valueobject;import java.util.ArrayList;import java.util.List;public class ClientInfoListObjects {private static List allClientInfoListObjects =new ArrayList();public static List getAllClientInfoListObjects() {return ClientInfoListObjects.allClientInfoListObjects;}public static void setAllClientInfoListObjects(List allClientInfoListObjects) {ClientInfoListObjects.allClientInfoListObjects = allClientInfoListObjects;}public ClientInfoListObjects() {}}（4）ClientInfoVO类的代码示例package com.px1987.imsystem.valueobject;import java.io.Serializable;import .Socket;public class ClientInfoVO implements Serializable{private static final long serialVersionUID = 4746970053581666382L;String senderIPAddress=null;int senderPort=0;public int getSenderPort() {return senderPort;}public void setSenderPort(int senderPort) {this.senderPort = senderPort;}public String getSenderIPAddress() {return senderIPAddress;}public void setSenderIPAddress(String senderIPAddress) {this.senderIPAddress = senderIPAddress;}public String getUserID() {return userID;}public void setUserID(String userID) {erID = userID;}public String getUserName() {return userName;}public void setUserName(String userName) {erName = userName;}public String getUserPassWord() {return userPassWord;}public void setUserPassWord(String userPassWord) { erPassWord = userPassWord;}public String getUserPassWordNoMD5() {return userPassWordNoMD5;}public void setUserPassWordNoMD5(String userPassWordNoMD5) { erPassWordNoMD5 = userPassWordNoMD5;}public String getUserEmail() {return userEmail;}public void setUserEmail(String userEmail) {erEmail = userEmail;}public String getRegisterTime() {return registerTime;}public void setRegisterTime(String registerTime) { this.registerTime = registerTime;}public String getUserMobileCode() {return userMobileCode;}public void setUserMobileCode(String userMobileCode) { erMobileCode = userMobileCode;}public Integer getType_User_Admin() {return type_User_Admin;}public void setType_User_Admin(Integer type_User_Admin) { this.type_User_Admin = type_User_Admin;}public String getAliaoName() {return aliaoName;}public void setAliaoName(String aliaoName) {this.aliaoName = aliaoName;}public String getPassWordAsk() {return passWordAsk;}public void setPassWordAsk(String passWordAsk) { this.passWordAsk = passWordAsk;}public String getUserImage() {return userImage;}public void setUserImage(String userImage) {erImage = userImage;}public String getPassWordAnswer() {return passWordAnswer;}public void setPassWordAnswer(String passWordAnswer) { this.passWordAnswer = passWordAnswer;}public String getUserResume() {return userResume;}public void setUserResume(String userResume) {erResume = userResume;}public Socket getSomeOneClientSocket() {return someOneClientSocket;}public void setSomeOneClientSocket(Socket someOneClientSocket) { this.someOneClientSocket = someOneClientSocket;}public static long getSerialVersionUID() {return serialVersionUID;}private String userID;private String userName;private String userPassWord;private String userPassWordNoMD5;private String userEmail = null;private String registerTime;private String userMobileCode = null;private Integer type_User_Admin; //该成员主要是区分用户的类型-----注册用户（=1）还是管理员（=2）private String aliaoName;private String passWordAsk;private String userImage;private String passWordAnswer;private String userResume;Socket someOneClientSocket=null; //便于在服务器端实现“群发消息”功能public ClientInfoVO() {}}（5）MessageInfoListObjects类的代码示例LinkedList集合同样也不具有线程同步性,但由于LinkedList集合是一种双向链式结构，因此查找数据的效率比较低——要从第一个索引元素开始，此时可以应用ArrayList集合；但它的插入和删除操作的效率比较高，所以对插入和删除操作比较频繁的应用中应该选择它。

创建一个公共的全局“消息对象池”(TreeMap)，因为它是要被多个线程访问的资源——必须设置为全局的，在TreeMap集合对象中再包装各个客户的消息信息的LinkedList对象；TreeMap集合不仅实现了Map接口、也实现了SortedMap接口。

TreeMap集合不仅可以保持成员元素的顺序，而且还可以排序成员元素。

HashMap集合有利于实现对集合中的成员元素进行插入、删除和定位元素等方面的操作，但如果需要根据键的自然顺序或开发人员自定义的顺序遍历集合中的各个成员元素，一般要采用TreeMap集合——因为TreeMap集合中所有的成员元素都保持着某种固定的顺序，而HashMap集合中的元素排列顺序是不固定的。

package com.px1987.imsystem.valueobject;import java.util.TreeMap;public class MessageInfoListObjects {private static TreeMap allMessageInfoLinkedListObjects =new TreeMap();public MessageInfoListObjects() {}public static TreeMap getAllMessageInfoLinkedListObjects() {return MessageInfoListObjects.allMessageInfoLinkedListObjects;//TreeMap集合也是非线程安全的集合}public static void setAllMessageInfoLinkedListObjects(TreeMap allMessageInfoLinkedListObjects) {MessageInfoListObjects.allMessageInfoLinkedListObjects =allMessageInfoLinkedListObjects;}}（6）MessageInfoVO类的代码示例package com.px1987.imsystem.valueobject;import java.io.Serializable;public class MessageInfoVO implements Serializable {private static final long serialVersionUID = -9180275501651541201L;String sendMessageInfoText=null;String senderIPAddress=null;String sendDateAndTime=null;String senderIDName=null;String receiveMessageInfoText=null;String receiveDateAndTime=null;String receiverIDName=null;String receiverIPAddress=null;String requestCommandText=null; //代表客户端请求的命令字符串public MessageInfoVO() {}public String getReceiverIDName() {return receiverIDName;}public void setReceiverIDName(String receiverIDName) { this.receiverIDName = receiverIDName;}public String getReceiverIPAddress() {return receiverIPAddress;}public void setReceiverIPAddress(String receiverIPAddress) { this.receiverIPAddress = receiverIPAddress;}public String getSendDateAndTime() {return sendDateAndTime;}public void setSendDateAndTime(String sendDateAndTime) { this.sendDateAndTime = sendDateAndTime;}public String getSenderIDName() {return senderIDName;}public void setSenderIDName(String senderIDName) {this.senderIDName = senderIDName;}public String getSenderIPAddress() {return senderIPAddress;}public void setSenderIPAddress(String senderIPAddress) { this.senderIPAddress = senderIPAddress;}public String getRequestCommandText() {return requestCommandText;}public void setRequestCommandText(String requestCommandText) { this.requestCommandText = requestCommandText;}public String getReceiveMessageInfoText() {return receiveMessageInfoText;}public void setReceiveMessageInfoText(String receiveMessageInfoText) { this.receiveMessageInfoText = receiveMessageInfoText;}public String getSendMessageInfoText() {return sendMessageInfoText;}public void setSendMessageInfoText(String sendMessageInfoText) { this.sendMessageInfoText = sendMessageInfoText;}public String getReceiveDateAndTime() {return receiveDateAndTime;}public void setReceiveDateAndTime(String receiveDateAndTime) {this.receiveDateAndTime = receiveDateAndTime;}}1.1.1蓝梦集团IM系统中的通用模块的具体实现1、系统工作参数的配置（config）的属性配置文件（1）工作参数的属性配置文件imSystemConfig.properties注意该文件应该要放在系统的classPath的路径下，为什么？请思考在Java中的文件定位方式和如何正确地定位文件？（2）目前在客户端子系统中的imSystemConfig.properties文件中的内容serverSocketListenerHostName=127.0.0.1serverSocketListenerPort=3721handlerLogInfoDelayMS=10000handlerLogInfoPeriodMS=10000（3）目前在服务端子系统中的imSystemConfig.properties文件中的内容（4）Eclipse自动将src目录中的文件拷贝到bin目录中（classPath目录）2、对配置参数教学解析的接口（1）添加ParseSystemConfigInterface接口理解为什么要“面向接口编程实现类”？请思考：接口的主要作用是什么？——“规范”和“功能要求”（2）ParseSystemConfigInterface接口的定义体package com.px1987.imsystem.config.inter;import com.px1987.imsystem.exception.OASystemException;public interface ParseSystemConfigInterface {public String getOneSystemConfigItem(String itemIDName);public void setOneSystemConfigItem(String itemIDName,String newValue);public void savePropertiesItem(String propertiesFileName) throws OASystemException;}3、ParseSystemConfigInterface接口的具体实现类（1）熟悉Java中的Properties类（2）属性文件解析实现类ParseSystemConfigImple_ByJavaPropertyFile（3）实现类的代码package com.px1987.imsystem.config.imple;import java.io.IOException;import java.io.InputStream;import java.util.Properties;import com.px1987.imsystem.config.inter.ParseSystemConfigInterface;public class ParseSystemConfigImple_ByJavaPropertyFile implements ParseSystemConfigInterface{private static Properties oneProperties=null; // “全局共享”的效果static{oneProperties=new Properties();InputStream propertiesFileStream=ParseSystemConfigImple_ByJavaPropertyFile.class.getResourceAsStream("/imSyst emConfig.properties");try {oneProperties.load(propertiesFileStream);} catch (IOException e) {System.out.println("在加载属性文件时程序出现了异常错误！");}}public ParseSystemConfigImple_ByJavaPropertyFile() {}public String getOneSystemConfigItem(String itemIDName) {return oneProperties.getProperty(itemIDName);}public void setOneSystemConfigItem(String itemIDName,String newValue) { oneProperties.setProperty(itemIDName,newValue);}public void savePropertiesItem(String propertiesFileName)throws OASystemException{OutputStream propertiesFileStream=null;try {propertiesFileStream = new FileOutputStream(propertiesFileName);} catch (FileNotFoundException e) {throw new OASystemException("在保存属性文件时程序出现了异常错误！");}try {oneProperties.store(propertiesFileStream, "这是修改后的属性文件内容");} catch (IOException e) {throw new OASystemException("在保存属性文件时程序出现了异常错误！");}}}（4）熟悉和了解java.util.Properties类的编程实现的方法1)首先依据当前类所在的classPath路径，加载（利用load方法）属性文件到内存中2)然后再从属性集合中获得指定属性名称的项目4、异常信息处理功能类（1）熟悉和了解在Java中自定义异常类的基本规则1)为什么要自定义异常类？——统一进行异常处理，提供更准确的错误信息（中文信息）2)如何定义自己的异常类？——从系统中的“某个异常类”进行继承，或者选择从Exception类进行继承（2）在项目中添加OASystemException类（3）OASystemException类的代码示例package com.px1987.imsystem.exception;public class OASystemException extends Exception {public OASystemException() {}public OASystemException(String message) {super(message);}public OASystemException(Throwable cause) {super(cause);}public OASystemException(String message, Throwable cause) { super(message, cause);}}5、异常日志信息保存功能模块（1）遵守“面向接口”的编程原则所有的功能类都应该要提供接口的实现（2）了解java.util.logger包的功能（3）java.util.logger.Logger类的主要功能说明（4）在项目中添加ExceptionLogInterface接口（5）接口ExceptionLogInterface的定义package com.px1987.imsystem.exceptionloginfo.inter; import com.px1987.imsystem.exception.OASystemException; public interface ExceptionLogInterface {public void logInfo(String logInfoText);}6、ExceptionLogInterface接口的实现类（1）控制台方式输出的实现类ExceptionLogImple_PrintToConsole（适用于开发过程中）利用JDK中的java.util.logging.Logger类实现在控制台中显示输出日志信息。