Hướng dẫn học lập trình Socket với Java

[dulichviet]

source code:

client.java

[color=#000000]
package blog[/color][color=#007700].[/color][color=#0000bb]socket[/color][color=#007700].[/color][color=#0000bb]simple[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]bufferedreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]inputstreamreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]printstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]net[/color][color=#007700].[/color][color=#0000bb]socket[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]net[/color][color=#007700].[/color][color=#0000bb]unknownhostexception[/color][color=#007700]; public class [/color][color=#0000bb]client [/color][color=#007700]{    private [/color][color=#0000bb]void connect[/color][color=#007700]() {        try {            [/color][color=#0000bb]socket socket [/color][color=#007700]= new [/color][color=#0000bb]socket[/color][color=#007700]([/color][color=#dd0000]"localhost"[/color][color=#007700], [/color][color=#0000bb]1994[/color][color=#007700]);            [/color][color=#ff8000]// sending to server            [/color][color=#0000bb]printstream ps [/color][color=#007700]= new [/color][color=#0000bb]printstream[/color][color=#007700]([/color][color=#0000bb]socket[/color][color=#007700].[/color][color=#0000bb]getoutputstream[/color][color=#007700]());            [/color][color=#0000bb]ps[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"thieu mao is here ^^!"[/color][color=#007700]);                       [/color][color=#ff8000]// receiving from server            [/color][color=#0000bb]bufferedreader br [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700](new [/color][color=#0000bb]inputstreamreader[/color][color=#007700](                    [/color][color=#0000bb]socket[/color][color=#007700].[/color][color=#0000bb]getinputstream[/color][color=#007700]()));            [/color][color=#0000bb]string response [/color][color=#007700]= [/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]();            if ([/color][color=#0000bb]response[/color][color=#007700]!=[/color][color=#0000bb]null[/color][color=#007700]){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"server answered: " [/color][color=#007700]+ [/color][color=#0000bb]response[/color][color=#007700]);            }        } catch ([/color][color=#0000bb]unknownhostexception e[/color][color=#007700]) {            [/color][color=#ff8000]// todo auto-generated catch block            [/color][color=#0000bb]e[/color][color=#007700].[/color][color=#0000bb]printstacktrace[/color][color=#007700]();        } catch ([/color][color=#0000bb]ioexception e[/color][color=#007700]) {            [/color][color=#ff8000]// todo auto-generated catch block            [/color][color=#0000bb]e[/color][color=#007700].[/color][color=#0000bb]printstacktrace[/color][color=#007700]();        }    }     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string [/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]){        [/color][color=#0000bb]client c [/color][color=#007700]= new [/color][color=#0000bb]client[/color][color=#007700]();        [/color][color=#0000bb]c[/color][color=#007700].[/color][color=#0000bb]connect[/color][color=#007700]();    }}[/color] 

server.java

[color=#000000]
package blog[/color][color=#007700].[/color][color=#0000bb]socket[/color][color=#007700].[/color][color=#0000bb]simple[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]bufferedreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]inputstreamreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]printstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]net[/color][color=#007700].[/color][color=#0000bb]serversocket[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]net[/color][color=#007700].[/color][color=#0000bb]socket[/color][color=#007700]; public class [/color][color=#0000bb]server [/color][color=#007700]{    private [/color][color=#0000bb]void server[/color][color=#007700]() {        try {            [/color][color=#0000bb]serversocket server [/color][color=#007700]= new [/color][color=#0000bb]serversocket[/color][color=#007700]([/color][color=#0000bb]1994[/color][color=#007700]);            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"server is ready..."[/color][color=#007700]);            [/color][color=#0000bb]socket socket [/color][color=#007700]= [/color][color=#0000bb]server[/color][color=#007700].[/color][color=#0000bb]accept[/color][color=#007700]();            [/color][color=#0000bb]bufferedreader br [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700](new [/color][color=#0000bb]inputstreamreader[/color][color=#007700](                    [/color][color=#0000bb]socket[/color][color=#007700].[/color][color=#0000bb]getinputstream[/color][color=#007700]()));            [/color][color=#0000bb]string request [/color][color=#007700]= [/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]();            if ([/color][color=#0000bb]request [/color][color=#007700]!= [/color][color=#0000bb]null[/color][color=#007700]) {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"received from a client: " [/color][color=#007700]+ [/color][color=#0000bb]request[/color][color=#007700]);                [/color][color=#ff8000]// process: select database, calculate...                // response to client                [/color][color=#0000bb]printstream ps [/color][color=#007700]= new [/color][color=#0000bb]printstream[/color][color=#007700]([/color][color=#0000bb]socket[/color][color=#007700].[/color][color=#0000bb]getoutputstream[/color][color=#007700]());                [/color][color=#0000bb]ps[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#0000bb]request[/color][color=#007700].[/color][color=#0000bb]touppercase[/color][color=#007700]());            }        } catch ([/color][color=#0000bb]ioexception e[/color][color=#007700]) {            [/color][color=#ff8000]// todo auto-generated catch block            [/color][color=#0000bb]e[/color][color=#007700].[/color][color=#0000bb]printstacktrace[/color][color=#007700]();        }    }     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string [/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]){        [/color][color=#0000bb]server s [/color][color=#007700]= new [/color][color=#0000bb]server[/color][color=#007700]();        [/color][color=#0000bb]s[/color][color=#007700].[/color][color=#0000bb]server[/color][color=#007700]();    }}[/color] 

[imu729]

có cách nào để server gửi 1 dữ liệu độc lập khi có 1 action nào đó về client ko?

[honghai45633]

làm sao chuyển sang swing để nhìn trực quan hơn các bác nhỉ?

[trangvnlabour]

a ơi sao e chạy lại bị lỗi như này:
exception in thread "main" java.lang.runtimeexception: uncompilable source code - cannot find symbol
symbol: class client
location: class simple.client
at simple.client.main(client.java:44)
java result: 1