我在java中用socket读取server端发过来的二进制流，从包头前面11个字节中读取包体的字节总数，然后再循环读取包体的字节数，但当server端的数据字节比较大时就不能完全读过来，如从server端发送了 3万个字节，这时client端程序就会不能完全读出server端的字节，可能只能读2万多个；当字节数少于2000 以下时，就基本没有出现过问题。
我把程序贴出来，这段程序有什么问题么？接收大量的数据该如何处理为好？
想了很久，没想明白是怎么回事，望各位不吝赐教！！！

public class SocketService {

private static Socket socket;
private static InputStream is;
private static OutputStream os;
private static BufferedInputStream br;

public static byte[] getReceiveBytes(Catalog catalog,byte[] b) {
    byte[] receive_body_byte = {};
    try {
    socket = new Socket(catalog.getPrivateTcpIp(), Integer.parseInt(catalog.getPrivateTcpIPPort()));

        is = new DataInputStream(socket.getInputStream());
        os = new DataOutputStream(socket.getOutputStream());
        os.write(b);
        br = new BufferedInputStream(is);

        // 包体长度 packlength。
        String packlength = "";

                        // 先收11个字节，函数解析出数据包长度 
        byte[] encry_byte = new byte[11];       
        int sizeHead = br.read(encry_byte);
        for (int m = 0; m < sizeHead; m++) {
            if (m > 6) {
                packlength = packlength + Util.byte2HexStr(encry_byte[m]);
            }
        }
        receive_body_byte = new byte[Integer.parseInt(packlength, 16)];
                         // 接收剩下的字节
        int size = br.read(receive_body_byte);
        //打印接收到的字节
        System.out.println("\n-------接收到的字节总数是-------------- "+receive_body_byte.length);

        os.flush();
        is.close();
        os.close();
        br.close();
    } catch (Exception e) { 
                    System.out.print("**********Socket异常！！！！*********"+e.getMessage());
                    return null;
    }

    return receive_body_byte;
}

========= 上面的程序不知哪里有问题，于是我就又优化了一下，代码如下，但遇到大数据还是不能全读出来===================

       public class SocketService {

private static Socket socket;
private static InputStream is;
private static OutputStream os;
private static BufferedInputStream br;

public static byte[] getReceiveBytes(Catalog catalog,byte[] b) {
    byte[] receive_body_byte = {};
    try {
    socket = new Socket(catalog.getPrivateTcpIp(), Integer.parseInt(catalog.getPrivateTcpIPPort()));

        is = new DataInputStream(socket.getInputStream());
        os = new DataOutputStream(socket.getOutputStream());
        os.write(b);
        br = new BufferedInputStream(is);

        // 包体长度 packlength。
        String packlength = "";

                        // 先收11个字节，函数解析出数据包长度 
        byte[] encry_byte = new byte[11];       
        int sizeHead = br.read(encry_byte);
        for (int m = 0; m < sizeHead; m++) {
            if (m > 6) {
                packlength = packlength + Util.byte2HexStr(encry_byte[m]);
            }
        }
        receive_body_byte = new byte[Integer.parseInt(packlength, 16)];
                            int size = 0
        //  分次取server端的数据，即每次从流中取1024个字节，不足1024就一次取过来
        while(true){
        int a = receive_body_byte.length/1024;

        if(a>=1){
            int last=0;
            Thread.sleep(280);
            for(int i=0;i<a;i++){
                //Thread.sleep(50);
                byte[] btmp = new byte[1024];
                br.read(btmp);
                    getBytes(receive_body_byte,i*1024,btmp);
                    last = last + i*1024;
                    Thread.sleep(100);
                }
                //然后取剩余不足1024个的字节
                int aa = receive_body_byte.length%1024;
                byte[] bmp = new byte[aa];
                //Thread.sleep(200);
                if(aa!=0){
                    br.read(bmp);
                    System.out.println(" aa------------"+aa);
                    p(bmp);
                    Thread.sleep(100);
                    getBytes(receive_body_byte,a*1024,bmp);
                }
                break;
            }else{

                br.read(receive_body_byte);
                break;
            }
        }
        //打印接收到的字节
        System.out.println("\n-------接收到的字节总数是-------------- "+receive_body_byte.length);

        os.flush();
        is.close();
        os.close();
        br.close();
    } catch (Exception e) { 
                    System.out.print("**********Socket异常！！！！*********"+e.getMessage());
                    return null;
    }

    return receive_body_byte;
}

socket接收并显示16进制的数据

wry13172

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