Socket简单的数据包的发送与接收

Socket简单的数据包的发送与接收,第1张

具体的发包与拆包的协议可以自己定义:

我定义:包头第一个字节为1时则为接收文件为0则为接收字符

服务器:

private static void writefile(DataOutputStream dos, FileInputStream fis) {

byte[] bytes=new byte[2];//先发包头

int length;

bytes[0]=1;

bytes[1]=5;

try {

doswrite(bytes);//发给客户端

} catch (IOException e) {

eprintStackTrace();

Systemoutprintln("发送包头失败");

}

try{

byte[] bytes1=new byte[1024];//发送包体数据

while((length=fisread(bytes1, 0,bytes1length))!=-1){

doswrite(bytes1,0,bytes1length);

dosflush();

}

}catch(Exception e){

eprintStackTrace();

Systemoutprintln("发送文件包体数据失败");

}

}

private static void writestring(DataOutputStream dos) {

// TODO Auto-generated method stub

String string="sending";

byte[] bytes=new byte[2];//同理发送字符串的包头

bytes[0]=0;

bytes[1]=5;

try {

doswrite(bytes);

} catch (IOException e) {

eprintStackTrace();

Systemoutprintln("发送包头失败");

}

try {

byte[] bytes1=new byte[1024];//发送字符串的包体数据

bytes1=stringgetBytes();

doswrite(bytes1);

} catch (IOException e1) {

e1printStackTrace();

Systemoutprintln("发送字符包体数据失败");

}

}

}

客户端:

try{

s=new Socket("1921681106",45);

Logd(TAG, "run:2222222222222");

is=sgetInputStream();

dis=new DataInputStream(is);

new Thread(){

@Override

public void run(){

superrun();

try{

dis = new DataInputStream(sgetInputStream());

Logd(TAG, "33333333333333");

byte[] bytes=new byte[2];

disread(bytes);

if(bytes[0]==0){

int a=bytes[1];

byte[] bytes1=new byte[a];

disreadFully(bytes1);

String ssss=new String(bytes1);

Message msg=new Message();

msgwhat=2;

msgobj=ssss;

revhandlersendMessage(msg);

}

else {

{

File file=new File("/storage/emulated/0/1/cjpg");

Logd(TAG,"run:255555555555555555555555");

fos=new FileOutputStream(file);

Logd(TAG,"run:333333333333333333333");

inputByte = new byte[30];//接收数据

Message msg=new Message();

msgwhat=0;

revhandlersendMessage(msg);

Logd(TAG,"run:44444444444444");

while((length = disread(inputByte, 0, inputBytelength)) != -1) {

Logd(TAG,"44444444");

foswrite(inputByte,0,inputBytelength);

fosflush();

}

msg = new Message();

msgwhat=1;

revhandlersendMessage(msg);

if(fos != null)

fosclose();

if(dis != null)

disclose();

sclose();

}

}

} catch (FileNotFoundException e) {

eprintStackTrace();

} catch (IOException e) {

eprintStackTrace();

}

}

}start();

} catch (UnknownHostException e) {

eprintStackTrace();

} catch (IOException e) {

eprintStackTrace();

}

运行结果:

服务器:

![V1LEZDB Z07VQ482$02HO%Rpng

客户端:

以下是android手机上发送文件名并且得到文件大小的代码Java

code

//

向服务器提出下载请求,返回下载文件的大小

private

long

request(String

fileName,

String

password)

throws

IOException

{

//

获取socket的输入流并包装成DataInputStream

DataInputStream

in

=

new

DataInputStream(socketgetInputStream());

//

获取socket的输出流并包装成PrintWriter

PrintWriter

out

=

new

PrintWriter(new

OutputStreamWriter(

socketgetOutputStream()));

//

生成下载请求字符串

String

requestString

=

fileName;//

+

@

+

password;

Systemoutprintln(发出下载请求:+fileName);

outprintln(requestString);

//

发出下载请求

outflush();

return

inreadLong();

//

接收并返回下载文件长度}

以下是C#服务器收到android发来的文件名,知道文件之后发送文件大小和文件的代码C#

code

private

string

ReceiveFileName(){string

recvStr

=

;byte[]

recvBytes

=

new

byte[1024];int

bytes

=

m_socketReceive(recvBytes,

recvBytesLength,

0);

//从android客户端接受信息recvStr

=

EncodingASCIIGetString(recvBytes,

0,

bytes);ConsoleWriteLine(文件名+recvStr);return

recvStr;//返回文件名}

private

void

SendFile(){while

(m_IsStart){string

fileName

=

ReceiveFileName();if

(fileName

!=

){if

(FileExists(m_FileDirect

+

1jpg))//下载本地存在的一个文件{FileInfo

fi

=

new

FileInfo(m_FileDirect

+

1jpg);byte[]

len

=

BitConverterGetBytes(fiLength);m_socketSend(len);//发送文件的长度//发送文件try{m_socketSendFile(m_FileDirect

+

1jpg);}catch

(Exception

e){ConsoleWriteLine(出现错误

+

eMessage);}}}}}

------解决方案--------------------------------------------------------

Java

code//

获取socket的输入流并包装成DataInputStream

这个不就是接收的地方吗在第一段代码中

可以定义一个结构体变量,结构体里面有float、double类型的数据,然后发送;

参考如下:

struct person{

char name[20];

int age;

float high;

};

/可在发送数据的地方对数据进行处理,将其转换成一个字符串进行传送,而在接受方定义相同的结构体对这个字符串进行解析即可。/

//发送方代码如下:

char temp[100]; //传送的字符串

struct person p1; //声明一个需要传送的结构体

p1age = 10;

p1high = 180f;

strcpy(p1name,"zhangsan",sizeof(p1name));

memset(temp,0,sizeof(temp)); //对该内存段进行清 0

memcpy(temp,&p1,sizeof(person)); //把这个结构体中的信息从内存中读入到字符串temp中

//接下来传送temp这个字符串就可以了

sendto(sock,temp,sizeof(person),0,(SOCKADDR)&addSer,sizeof(SOCKADDR));

//这样这个结构体的信息就发送到addSer相应的套接字了

/接收方代码如下:

同样需要定义字符串和相同的结构体对象/

char temp[100]; //传送的字符串

struct person p2; //声明一个存放接收信息的结构体

memset(temp,0,sizeof(temp)); //清内存

//下面是接收字符串的代码

recvfrom(sock_listen,temp,sizeof(temp),0,(sockaddr)&addCli,&len);

//下面对字符串信息进行还原,将其变成的结构体数据

memcpy(&p2,temp,sizeof(person)); //解析过程

//下面就可以对p2中的数据进行各种操作了,也完成了结构体数据的传送。

你的文件中的问题

// 会阻塞进程,直到有客户端连接上来为止

// 既然是直到有客户端连接上,那么就要弄明白哪个是与客户端连接的套接字

// sockClient就是与客户端连接的套接字

sockClient = accept(sockServer, (SOCKADDR)&addrClient, &len);

//接收并打印客户端数据

recv(sockClient, recvBuf, 100, 0);

printf("%s\n", recvBuf);

// 所以此处,应该把sockServer改为sockClient

send(/sockServer/sockClient, sendBuf, 100, 0);

PS:服务器客户端通信,是要保持服务器与客户端的连接。

而不能这样立即关闭,如果设置不对,立即关闭,缓冲区的数据是会丢失的。那客户端也就不会再收到数据了。

你可以加Sleep(10000);来测是通信过程

//关闭socket

closesocket(sockClient);

下面是一个简单的通讯实例,进行Server和Client之间的文件传输。。如果是简单的文本传输的话简化掉文本操作的内容即可。。

1服务器端

package sterning;

import javaioBufferedInputStream;

import javaioDataInputStream;

import javaioDataOutputStream;

import javaioFile;

import javaioFileInputStream;

import javanetServerSocket;

import javanetSocket;

public class ServerTest {

int port = 8821;

void start() {

Socket s = null;

try {

ServerSocket ss = new ServerSocket(port);

while (true) {

// 选择进行传输的文件

String filePath = "D:\\librar";

File fi = new File(filePath);

Systemoutprintln("文件长度:" + (int) filength());

// public Socket accept() throws

// IOException侦听并接受到此套接字的连接。此方法在进行连接之前一直阻塞。

s = ssaccept();

Systemoutprintln("建立socket链接");

DataInputStream dis = new DataInputStream(new BufferedInputStream(sgetInputStream()));

disreadByte();

DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));

DataOutputStream ps = new DataOutputStream(sgetOutputStream());

//将文件名及长度传给客户端。这里要真正适用所有平台,例如中文名的处理,还需要加工,具体可以参见Think In Java 4th里有现成的代码。

pswriteUTF(figetName());

psflush();

pswriteLong((long) filength());

psflush();

int bufferSize = 8192;

byte[] buf = new byte[bufferSize];

while (true) {

int read = 0;

if (fis != null) {

read = fisread(buf);

}

if (read == -1) {

break;

}

pswrite(buf, 0, read);

}

psflush();

// 注意关闭socket链接哦,不然客户端会等待server的数据过来,

// 直到socket超时,导致数据不完整。

fisclose();

sclose();

Systemoutprintln("文件传输完成");

}

} catch (Exception e) {

eprintStackTrace();

}

}

public static void main(String arg[]) {

new ServerTest()start();

}

}

2socket的Util辅助类

package sterning;

import javanet;

import javaio;

public class ClientSocket {

private String ip;

private int port;

private Socket socket = null;

DataOutputStream out = null;

DataInputStream getMessageStream = null;

public ClientSocket(String ip, int port) {

thisip = ip;

thisport = port;

}

/ //

创建socket连接

@throws Exception

exception

/

public void CreateConnection() throws Exception {

try {

socket = new Socket(ip, port);

} catch (Exception e) {

eprintStackTrace();

if (socket != null)

socketclose();

throw e;

} finally {

}

}

public void sendMessage(String sendMessage) throws Exception {

try {

out = new DataOutputStream(socketgetOutputStream());

if (sendMessageequals("Windows")) {

outwriteByte(0x1);

outflush();

return;

}

if (sendMessageequals("Unix")) {

outwriteByte(0x2);

outflush();

return;

}

if (sendMessageequals("Linux")) {

outwriteByte(0x3);

outflush();

} else {

outwriteUTF(sendMessage);

outflush();

}

} catch (Exception e) {

eprintStackTrace();

if (out != null)

outclose();

throw e;

} finally {

}

}

public DataInputStream getMessageStream() throws Exception {

try {

getMessageStream = new DataInputStream(new BufferedInputStream(socketgetInputStream()));

return getMessageStream;

} catch (Exception e) {

eprintStackTrace();

if (getMessageStream != null)

getMessageStreamclose();

throw e;

} finally {

}

}

public void shutDownConnection() {

try {

if (out != null)

outclose();

if (getMessageStream != null)

getMessageStreamclose();

if (socket != null)

socketclose();

} catch (Exception e) {

}

}

}

3客户端

package sterning;

import javaioBufferedOutputStream;

import javaioDataInputStream;

import javaioDataOutputStream;

import javaioFileOutputStream;

public class ClientTest {

private ClientSocket cs = null;

private String ip = "localhost";// 设置成服务器IP

private int port = 8821;

private String sendMessage = "Windwos";

public ClientTest() {

try {

if (createConnection()) {

sendMessage();

getMessage();

}

} catch (Exception ex) {

exprintStackTrace();

}

}

private boolean createConnection() {

cs = new ClientSocket(ip, port);

try {

csCreateConnection();

Systemoutprint("连接服务器成功!" + "\n");

return true;

} catch (Exception e) {

Systemoutprint("连接服务器失败!" + "\n");

return false;

}

}

private void sendMessage() {

if (cs == null)

return;

try {

cssendMessage(sendMessage);

} catch (Exception e) {

Systemoutprint("发送消息失败!" + "\n");

}

}

private void getMessage() {

if (cs == null)

return;

DataInputStream inputStream = null;

try {

inputStream = csgetMessageStream();

} catch (Exception e) {

Systemoutprint("接收消息缓存错误\n");

return;

}

try {

//本地保存路径,文件名会自动从服务器端继承而来。

String savePath = "E:\\";

int bufferSize = 8192;

byte[] buf = new byte[bufferSize];

int passedlen = 0;

long len=0;

savePath += inputStreamreadUTF();

DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(newBufferedOutputStream(new FileOutputStream(savePath))));

len = inputStreamreadLong();

Systemoutprintln("文件的长度为:" + len + "\n");

Systemoutprintln("开始接收文件!" + "\n");

while (true) {

int read = 0;

if (inputStream != null) {

read = inputStreamread(buf);

}

passedlen += read;

if (read == -1) {

break;

}

//下面进度条本为图形界面的prograssBar做的,这里如果是打文件,可能会重复打印出一些相同的百分比

Systemoutprintln("文件接收了" + (passedlen 100/ len) + "%\n");

fileOutwrite(buf, 0, read);

}

Systemoutprintln("接收完成,文件存为" + savePath + "\n");

fileOutclose();

} catch (Exception e) {

Systemoutprintln("接收消息错误" + "\n");

return;

}

}

public static void main(String arg[]) {

new ClientTest();

}

}

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