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源代码下载链接：http://download.csdn.net/detail/sky453589103/9514686
我设计的时候是先从服务器端开始设计的，服务器端先给出接口，然后客户端针对接口编程。
在说服务器的代码之前先说说数据库的设计吧。
数据的设计是简单的，只有两个表：
create database SimpleChat;
CREATE TABLE IF NOT EXISTS Account (
username varchar(50) NOT NULL,
userpassword varchar(20) NOT NULL,
sex ENUM('male', 'female') NOT NULL,
status ENUM('on', 'off', 'leave', 'busy') NOT NULL,
constraint A_PK primary key(username)
);
CREATE TABLE IF NOT EXISTS Friend(
user_1 varchar(50) NOT NULL,
user_2 varchar(50) NOT NULL,
constraint F_PK primary key (user_1, user_2),
constraint F_FK1 foreign key (user_1) references Account(username),
constraint F_FK2 foreign key (user_2) references Account(username)
);在源代码中，服务器端的项目名称是SimpleChatServer，
public ResponseMessage SignUp(String name, String password, Sex sex) {
String sexValue = "";
String statusValue = "off";
if (Sex.MALE == sex) {
sexValue = "male";
} else if (Sex.FEMALE == sex) {
sexValue = "female";
}
ResponseMessage response = new ResponseMessage(0, "Success");
try {
if (username.matches("[; ,]") || password.matches("[; ,]")) {
response.setCode(1);
response.setDescription("username or password has illigal charactor!");
return response;
}
final String sql = "insert into Account values(\'" + name + "\', \'" + password + "\', \'" + sexValue
+ "\', \'" + statusValue + "\');";
Statement statement = conn.createStatement();
statement.executeUpdate(sql);
} catch (SQLException e) {
response.setCode(1);
response.setDescription(e.getMessage());
}
return response;
} final String sql = "insert into Account values(\'" + name + "\', \'" + password + "\', \'" + sexValue
+ "\', \'" + statusValue + "\');";
Statement statement = conn.createStatement();
statement.executeUpdate(sql); public void AddUser(String name, Socket s) {
userBuf.put(name, s);
}
public void RemoveUser(String name) {
userBuf.remove(name);
}其实这两个函数只是吧userBuf中的响应的键值对给删除了。不会访问数据库。写这两个方法的原因是为了以后如果要改变userBuf的表现形式，可以不用改变客户端的代码。标签：
原文地址：http://blog.csdn.net/sky453589103/article/details/51351803
