Question

我是论坛的新手，可能已将此错误发布 - 请帮助新手。

作为开发Android App项目的一部分，我需要能够从应用程序连接到一个设置位置，该位置具有一个基于微处理器（不可连接）的LAN接口，它将接受十六进制的set命令。响应以十六进制给出。

使用我试图修改的示例套接字程序（参见下面的代码），我可以看到（使用wireshark）传输的字符串是ASCII，而不是十六进制，所以我发送38个字节，而不是18个字节使用0x前缀。

我尝试过使用LONG，但我尝试发送的值太大（请参阅String process ='0x .....'代码中途），我得到'字面值0x ...类型int的。超出范围。

我希望有人指出我正确的方向。

由于

// package bdn;
/* The java.net package contains the basics needed for network operations. */
import java.net.*;
/* The java.io package contains the basics needed for IO operations. */
import java.io.*;
/** The SocketClient class is a simple example of a TCP/IP Socket Client.
* For a detailed explanation of the classes in this project see
* bdn.borland.com/article/0,1410,31995,00.html
*/

public class SocketClient 
{
    public static void main(String[] args) 
    {
        /** Define a host server */
        String host = "192.168.1.199";
        /** Define a port */
        int port = 3376;
        int i = 0;

        StringBuffer instr = new StringBuffer();
        // String TimeStamp;
        System.out.println("SocketClient initialized to " + host + ", port " + port );

        try 
        {
            /** Obtain an address object of the server */
            InetAddress address = InetAddress.getByName(host);
            /** Establish a socket connection */
            Socket connection = new Socket(address, port);
            /** Instantiate a BufferedOutputStream object */
            BufferedOutputStream bos = new BufferedOutputStream(connection.getOutputStream());

            /** Instantiate an OutputStreamWriter object with the optional character
            * encoding.
            */
            OutputStreamWriter osw = new OutputStreamWriter(bos, "US-ASCII");

            // TimeStamp = new java.util.Date().toString();
            String process = "0x308101000c00234C51050000000099670007";

            System.out.println("Data to be sent is " + process) ;

            /** Write across the socket connection and flush the buffer */
            osw.write(process);
            osw.flush();

            System.out.println("Data sent is " + process) ;

            /** Instantiate a BufferedInputStream object for reading
            * incoming socket streams.
            */

            BufferedInputStream bis = new BufferedInputStream(connection.getInputStream());
            /**Instantiate an InputStreamReader with the optional
            * character encoding.
            */

            InputStreamReader isr = new InputStreamReader(bis, "US-ASCII");

            /**Read the socket's InputStream and append to a StringBuffer */
            int c;
            for (i = 0; i <= 18; i++ ) 
            {
                c = isr.read() ;
                instr.append((char) c);
                System.out.println("character " + i + " value " + c);
            }

            /** Close the socket connection. */
            connection.close();
            System.out.println(instr);
        }
        catch (IOException f) 
        {
            System.out.println("IOException: " + f);
        }
        catch (Exception g) 
        {
            System.out.println("Exception: " + g);
        }
    }
}

Answer 1

我尝试使用LONG，但我尝试发送的值太大

没错。该值对应

4225287479528688525220725405996728206163975

并且long的最大值是

9223372036854775807

您可以将号码存储在BigInteger中，如下所示：

String process = "0x308101000c00234C51050000000099670007";
BigInteger bi = new BigInteger(process.substring(2), 16);

Android - Java - 传输/接收十六进制值

1 个答案: