如圖：客戶端與服務端連接不上，服務端處于阻塞狀態：

首先，使用FileInputStream流輸入文件，使用FileInputStream.read()方法讀取文件返回int型(與題無關，加深記憶，總是忘記強轉成int)；
其次，關于read()方法的介紹：Reads up to b.length bytes of data from this input stream into an array of bytes. This method blocks until some input is available; 表明read()方式是一個阻塞式方法；
解決方法：使用socket.shutdownOutput();關閉數據的輸出；

如圖：

客戶端：

@Testpublic void client(){InetAddress inet = null;Socket socket = null;OutputStream os = null;FileInputStream fis = null;//讀入文件try {//1.創建Socket // socket = new Socket(InetAddress.getByName(("127.0.0.1"),9988));inet = InetAddress.getByName("127.0.0.1");socket = new Socket(inet, 9988);//2.輸出流os = socket.getOutputStream();//3.輸入流fis = new FileInputStream(new File("程瀟.jpg"));//4.讀寫過程byte[] buffer = new byte[1024];int len;while((len = fis.read(buffer)) != -1){os.write(buffer,0,len);}//關閉數據的輸出socket.shutdownOutput();} catch (IOException e) {e.printStackTrace();} finally {//5.資源關閉if(os != null){try {os.close();} catch (IOException e) {e.printStackTrace();}}if(fis != null){try {fis.close();} catch (IOException e) {e.printStackTrace();}}if(socket != null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}

服務端：

@Testpublic void server(){Socket socket = null;InputStream is = null;FileOutputStream fos = null;try {ServerSocket ss = new ServerSocket(9988);socket = ss.accept();is = socket.getInputStream();fos = new FileOutputStream("瀟瀟子.jpg");byte[] buffer = new byte[1024];int len;while((len = is.read(buffer)) != -1){fos.write(buffer,0,len);}System.out.println("瀟瀟子服務端已收到來自："+socket.getInetAddress().getHostName()+"的消息");} catch (IOException e) {e.printStackTrace();} finally {if(fos != null){try {fos.close();} catch (IOException e) {e.printStackTrace();}}if(is != null){try {is.close();} catch (IOException e) {e.printStackTrace();}}if(socket != null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}

總結

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