和另一台机子做数据交换。代码如下
- Java code
public String send(String SendMessage,String clientIP,int clientPort) throws UnknownHostException, IOException{ System.out.println("------------clientIP="+clientIP+"-------------clientPort="+clientPort); Socket s = new Socket(clientIP,clientPort); System.out.println("s.getOutputStream()"+s.getOutputStream()); PrintStream out = new PrintStream(s.getOutputStream()); BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream())); InputStream is = s.getInputStream(); System.out.println("SendMessage:"+SendMessage); out.print(SendMessage); int b = 0; while ((b = is.read()) != -1) { System.out.println(b); bos.write(b); System.out.println(b); } byte[] bytes = bos.toByteArray();*/ int len = -1; while((len=is.available()) <=8) { len = is.available(); System.out.println("len:"+len); } byte[] bytes = new byte[8192]; is.read(bytes, 0 , bytes.length); String ReceiveMessage = StringUtil.trim(new String( bytes)); System.out.println("ReceiveMessage:"+ReceiveMessage); out.close(); s.close(); is.close(); return ReceiveMessage; }
为什么老是在while((len=is.available()) <=8) {
len = is.available();
System.out.println("len:"+len);
}
中循环，后天总是打印len=0；端口 ip都正确，求解！
------解决方案--------------------------------------------------------
类 InputStream 的 available 方法总是返回 0。
详细api文档。
------解决方案--------------------------------------------------------
api文档是这么写的：
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream。
------解决方案--------------------------------------------------------
返回此输入流方法的下一个调用方可以不受阻塞地从此输入流读取（或跳过）的字节数。