BookFloatingServer/BookFloatingServer.java

import java.sql.*;

import java.io.*;
import java.net.*;
import com.google.gson.Gson;

class Handle implements Runnable
{
	private Socket s;
	public Handle(Socket socket)
	{
		s=socket;
	}
	public void run()
	{
		System.out.println("New Connection.");
		InputStream is=null;
		BufferedReader br=null;
		OutputStream os=null;
		PrintWriter pw=null;
		try
		{
			is=s.getInputStream();
			br=new BufferedReader(new InputStreamReader(is));
			os=s.getOutputStream();
			pw=new PrintWriter(os);
			
			while(true)
			{	
				byte[] buf = new byte[1024];
				int len =is.read(buf);
				if(len < 0){
					break;
				}
				
				String str = new String(buf,0,len);
				str=new String(str.trim());
				
				System.out.println("String is: "+str);
				
				Gson gson=new Gson();
				AppJsonData data=null;
				try
				{
					data=gson.fromJson(str, AppJsonData.class);
				}
				catch(Exception e)
				{
					e.printStackTrace();
					System.out.println("Receive a incorrect json string.");
					continue;
				}
				
				System.out.println("AppJsonData:"+data.getType());
				switch(data.getType())
				{
				case "register":
				{
					RegisterData reg=null;
					try
					{
						reg=gson.fromJson(str, RegisterData.class);
					}
					catch(Exception e)
					{
						e.printStackTrace();
						System.out.println("Incorrect Register Data");
						break;
					}
					
					int ret=BookFloatingServer.Register(reg.getEmail(), reg.getPass(), reg.getNickname(), reg.getSchool());
					System.out.println("Register Finished. Ret("+ret+")");
					pw.write("{'ret':'"+ret+"'}");
					pw.flush();
				}
				break;
				case "login":
				{
					LoginData login=null;
					try
					{
						login=gson.fromJson(str, LoginData.class);
					}
					catch(Exception e)
					{
						e.printStackTrace();
						System.out.println("Incorrect Login Data");
						break;
					}
					
					int ret=BookFloatingServer.Login(login.getEmail(),login.getPass());
					pw.write("{'ret':'"+ret+"'}");
					pw.flush();
				}
				break;
				case "getpart":
				{
					
				}
				break;
				case "getfull":
				{
					
				}
				break;
				case "upload":
				{
					UploadData up=null;
					try
					{
						up=gson.fromJson(str,UploadData.class);
					}
					catch(Exception e)
					{
						e.printStackTrace();
						System.out.println("Incorrect Upload Data");
						continue;
					}
					
					int ret=BookFloatingServer.Upload(up.getBookname(),up.getAuthor(),up.getContext(),up.getImageURL());
					pw.write("{'ret':'"+ret+"'}");
					pw.flush();
				}
				break;
				default:
					System.out.println("Unknown Type");
					break;
				}
			}
			
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		finally
		{
			try{pw.close();}catch(Exception e){e.printStackTrace();}
			try{os.close();}catch(Exception e){e.printStackTrace();}
			try{br.close();}catch(Exception e){e.printStackTrace();}
			try{is.close();}catch(Exception e){e.printStackTrace();}
			try{s.close();}catch(Exception e){e.printStackTrace();}
		}
		
		System.out.println("Connection Lost.");
	}
}

public class BookFloatingServer
{
	public static int Login(String Email,String Password) {
		
		System.out.println("*Database*: Login with "+Email+" "+Password);
		
		Connection conn = null;
		String url="jdbc:mysql://gameharbor.cn:3306/test";
		Statement stmt = null;
		ResultSet rs = null;
		int ret=0;
		
		String RemotePassword = new String();
		try{
			conn=DriverManager.getConnection(url,"testuser","pwdtest");
			stmt=conn.createStatement();
			rs=stmt.executeQuery("SELECT pwass FROM user where email=\""+Email+"\"");
			if(rs.next())
			{
				RemotePassword=rs.getString(1);
			}
			
			if(RemotePassword.equals(Password))
			{
				ret=1;///Password Matchs
			}
			else
			{
				ret=0;///Password Does not Matchs
			}
		} catch(SQLException e) {
			e.printStackTrace();
			ret=-1;// Connection Error
		}
		finally
		{
			try{
				if(rs!=null) rs.close();
			} catch(SQLException e) {
				e.printStackTrace();
			}
			
			try{
				if(stmt!=null) stmt.close();
			} catch(SQLException e){
				e.printStackTrace();
			}
			
			try{
				if(conn!=null) conn.close();
			} catch(SQLException e) {
				e.printStackTrace();
			}
		}
		
		return ret;
	}
	
	public static int Register(String Email,String Password,String Nickname,String School){
		System.out.println("*Database*:Register with "+Email+" "+Password+" "+Nickname+" "+School);
		
		int upret=-1;
		Connection conn=null;
		String url="jdbc:mysql://gameharbor.cn:3306/test";
		PreparedStatement stmt = null;
		
		try{
			conn=DriverManager.getConnection(url,"testuser","pwdtest");
			String sqlString=new String("INSERT into test.user VALUES (?,?,?,?,?,?)");
			stmt=conn.prepareStatement(sqlString,Statement.RETURN_GENERATED_KEYS);
			stmt.setString(1,Email);
			stmt.setString(2, Password);
			stmt.setString(3, Nickname);
			stmt.setString(4, School);
			stmt.setString(5, "");
			stmt.setString(6, "");
			upret=stmt.executeUpdate();
		} catch(SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if(stmt!=null) stmt.close();
			} catch(SQLException e) {
				e.printStackTrace();
			}
			
			try{
				if(conn!=null) conn.close();
			} catch(SQLException e) {
				e.printStackTrace();
			}
		}
		
		return upret;
	}
	
	public static int Upload(String Bookname,String Author,String Context,String ImageURL){
		System.out.println("*Database*: Upload with "+Bookname+" "+Author+" "+Context+" "+ImageURL);
		int ret=-1;
		Connection conn=null;
		String url="jdbc:mysql://gameharbor.cn:3306/test";
		PreparedStatement stmt = null;
		
		try
		{
			conn=DriverManager.getConnection(url,"testuser","pwdtest");
			String sqlString=new String("INSERT into test.book VALUES (?,?,?,?,?)");
			stmt=conn.prepareStatement(sqlString,Statement.RETURN_GENERATED_KEYS);
			stmt.setString(1, Bookname);
			stmt.setString(2,Author);
			stmt.setString(3,"Provider Here");
			stmt.setString(4, ImageURL);
			stmt.setString(5, Context);
			ret=stmt.executeUpdate();
		}
		catch(SQLException e)
		{
			e.printStackTrace();
		}
		finally
		{
			try {
				if(stmt!=null) stmt.close();
			} catch(SQLException e) {
				e.printStackTrace();
			}
			
			try{
				if(conn!=null) conn.close();
			} catch(SQLException e) {
				e.printStackTrace();
			}
		}
		return ret;
	}
	
	public static FetchInfo Fetch()
	{
		FetchInfo ff=null;
		return ff;
	}
	
	public static void main(String[] args) {
		/*
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
			System.exit(-1);
		}
		
		/// ret=Login("test2@me.com","030201");
		int ret=Register("test3@me.com","030201","LiuTongYuan","QUST");
		System.out.println("Ret is "+ret);
		*/
		
		System.out.println("Program Started.");
		
		ServerSocket ss=null;
		try
		{
			ss=new ServerSocket(55555);
		}
		catch(IOException e)
		{
			e.printStackTrace();
			System.out.println("Error while create ServerSocket.");
			System.exit(0);
		}
		
		while(true)
		{
			Socket s=null;
			try
			{
				s=ss.accept();
				Thread workThread=new Thread(new Handle(s));
				workThread.start();
			}
			catch(Exception e)
			{
				e.printStackTrace();
				System.out.println("Error while starting a new connection.");
				break;
			}
		}
		
		try
		{
			ss.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		
	}
}

/*
import java.io.*;
import java.net.*;

public class BookFloatingServer {
	public class ServerThread implements Runnable
	{
		Socket s=null;
		BufferedReader br=null;
		public ServerThread(Socket s)
		{
			System.out.println("Thread Ready, ID="+Thread.currentThread().getId());
			this.s=s;
			try
			{
				br=new BufferedReader(
					new InputStreamReader(
						s.getInputStream())
					);
			}
			catch(Exception e)
			{
				e.printStackTrace();
				return;
			}
		}
		public void run()
		{
			System.out.println("Thread Start, ID="+Thread.currentThread().getId());
			try
			{
				s.close();
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
			
			System.out.println("Thread Over, ID="+Thread.currentThread().getId());
		}
	}
	public static void main(String[] args)
	{
		ServerSocket ss;
		try
		{
			ss=new ServerSocket(50001);
		}
		catch(Exception e)
		{
			e.printStackTrace();
			return;
		}
		
		while(true)
		{
			Socket s;
			try
			{
				s=ss.accept();
			}
			catch(Exception e)
			{
				e.printStackTrace();
				continue;
			}
			
			new Thread(new ServerThread(s)).start();
		}
	}
}
*/