TCP上传图片
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
class PicClient
{
public static void main(String[] args) throws Exception
{
Socket s = new Socket("192.168.23.27",10007);
FileInputStream fis = new FileInputStream("2.jpg");
OutputStream out = s.getOutputStream();
byte[] buf = new byte[1024];
int len = 0;
while ((len = fis.read(buf))!=-1)
{
out.write(buf,0,len);
}
//告诉服务端数据已写完
s.shutdownOutput();
InputStream in = s.getInputStream();
byte[] bufIn = new byte[1024];
int num = in.read(bufIn);
System.out.println(new String(bufIn,0,num));
fis.close();
s.close();
}
}
class PicServer
{
public static void main(String[] args) throws Exception
{
ServerSocket ss = new ServerSocket(10007);
Socket s = ss.accept();
InputStream in = s.getInputStream();
FileOutputStream fos = new FileOutputStream("server.jpg");
byte[] buf = new byte[1024];
int len = 0;
while ((len=in.read(buf))!=-1)
{
fos.write(buf,0,len);
}
OutputStream out = s.getOutputStream();
out.write("上传成功".getBytes());
fos.close();
s.close();
ss.close();
}
}
public class TcpDemo3 {
public static void main(String[] args) {
}
}
19.gif
服务端上传图片的局限性
当A客户端连接上以后，被服务端获取到。服务端执行具体流程。这时B客户端连接，只有等待。因为服务端还没有处理完A客户端的请求，还有循环回来执行下次accept方法。所以暂时获取不到B客户端对象。
那么为了可以让多个客户端同时并发访问服务端。
服务端最好就是将每个客户端封装到一个单独的线程中，这样，就可以同时处理多个客户端请求。如何定义线程呢？只要明确了每一个客户端要在服务端执行的代码即可。将该代码存入run方法中。
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
class PicClient0
{
public static void main(String[] args) throws Exception
{
Socket s = new Socket("192.168.22.42",10008);
FileInputStream fis = new FileInputStream("2.jpg");
OutputStream out = s.getOutputStream();
byte[] buf = new byte[1024];
int len = 0;
while ((len = fis.read(buf))!=-1)
{
out.write(buf,0,len);
}
//告诉服务端数据已写完
s.shutdownOutput();
InputStream in = s.getInputStream();
byte[] bufIn = new byte[1024];
int num = in.read(bufIn);
System.out.println(new String(bufIn,0,num));
fis.close();
s.close();
}
}
class PicThread implements Runnable
{
private Socket s;
PicThread(Socket s)
{
this.s = s;
}
public void run()
{
String ip = s.getInetAddress().getHostAddress();
try
{
System.out.println(ip+"......connected");
InputStream in = s.getInputStream();
FileOutputStream fos = new FileOutputStream("server.bmp");
byte[] buf = new byte[1024];
int len = 0;
while ((len = in.read(buf))!=-1)
{
fos.write(buf,0,len);
}
OutputStream out = s.getOutputStream();
out.write("上传成功".getBytes());
fos.close();
s.close();
}
catch (Exception e)
{
throw new RuntimeException(ip+"上传失败");
}
}
}
class PicServer0
{
public static void main(String[] args) throws Exception
{
ServerSocket ss = new ServerSocket(10008);
while (true)
{
Socket s = ss.accept();
new Thread(new PicThread(s)).start();
}
}
}
public class TcpDemo4 {
}
20.gif
避免图片名称被覆盖
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
class PicClient0
{
public static void main(String[] args) throws Exception
{
Socket s = new Socket("192.168.22.42",10008);
FileInputStream fis = new FileInputStream("2.jpg");
OutputStream out = s.getOutputStream();
byte[] buf = new byte[1024];
int len = 0;
while ((len = fis.read(buf))!=-1)
{
out.write(buf,0,len);
}
//告诉服务端数据已写完
s.shutdownOutput();
InputStream in = s.getInputStream();
byte[] bufIn = new byte[1024];
int num = in.read(bufIn);
System.out.println(new String(bufIn,0,num));
fis.close();
s.close();
}
}
class PicThread implements Runnable
{
private Socket s;
PicThread(Socket s)
{
this.s = s;
}
public void run()
{
int count = 1;
String ip = s.getInetAddress().getHostAddress();
try
{
System.out.println(ip+"......connected");
InputStream in = s.getInputStream();
File file = new File(ip+"("+(count)+")"+".jpg");
while (file.exists())
file = new File(ip+"("+(count++)+")"+".jpg");
FileOutputStream fos = new FileOutputStream(file);
byte[] buf = new byte[1024];
int len = 0;
while ((len = in.read(buf))!=-1)
{
fos.write(buf,0,len);
}
OutputStream out = s.getOutputStream();
out.write("上传成功".getBytes());
fos.close();
s.close();
}
catch (Exception e)
{
throw new RuntimeException(ip+"上传失败");
}
}
}
class PicServer0
{
public static void main(String[] args) throws Exception
{
ServerSocket ss = new ServerSocket(10008);
while (true)
{
Socket s = ss.accept();
new Thread(new PicThread(s)).start();
}
}
}
public class TcpDemo4 {
}
21.gif
通过主函数传值形式上传图片
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
class PicClient0
{
public static void main(String[] args) throws Exception
{
if(args.length!=1)
{
System.out.println("请选择一个jpg格式的图片");
return;
}
File file = new File(args[0]);
if (!(file.exists() && file.isFile()))
{
System.out.println("该文件有问题，要么不存在，要么不是文件");
return;
}
if (!file.getName().endsWith(".jpg"))
{
System.out.println("图片格式错误,请重新选择");
return;
}
if (file.length()>1024*1024*5)
{
System.out.println("文件过大，没安好心");
return;
}
Socket s = new Socket("192.168.22.42",10008);
FileInputStream fis = new FileInputStream("2.jpg");
OutputStream out = s.getOutputStream();
byte[] buf = new byte[1024];
int len = 0;
while ((len = fis.read(buf))!=-1)
{
out.write(buf,0,len);
}
//告诉服务端数据已写完
s.shutdownOutput();
InputStream in = s.getInputStream();
byte[] bufIn = new byte[1024];
int num = in.read(bufIn);
System.out.println(new String(bufIn,0,num));
fis.close();
s.close();
}
}
class PicThread implements Runnable
{
private Socket s;
PicThread(Socket s)
{
this.s = s;
}
public void run()
{
int count = 1;
String ip = s.getInetAddress().getHostAddress();
try
{
System.out.println(ip+"......connected");
InputStream in = s.getInputStream();
File file = new File(ip+"("+(count)+")"+".jpg");
while (file.exists())
file = new File(ip+"("+(count++)+")"+".jpg");
FileOutputStream fos = new FileOutputStream(file);
byte[] buf = new byte[1024];
int len = 0;
while ((len = in.read(buf))!=-1)
{
fos.write(buf,0,len);
}
OutputStream out = s.getOutputStream();
out.write("上传成功".getBytes());
fos.close();
s.close();
}
catch (Exception e)
{
throw new RuntimeException(ip+"上传失败");
}
}
}
class PicServer0
{
public static void main(String[] args) throws Exception
{
ServerSocket ss = new ServerSocket(10008);
while (true)
{
Socket s = ss.accept();
new Thread(new PicThread(s)).start();
}
}
}
public class TcpDemo4 {
}
22.gif
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