java socket 传送字节流(前后台)

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因为考虑到数据传送的安全性.所以,用字节流进行socket的传输..例子如下:

客户端:

//获得流
byteOut = new ByteArrayOutputStream();
out = new DataOutputStream(byteOut);

//转为字节流
byte[] messes=message.getBytes("GBK");
//获得长度
int length=messes.length;

//把欲发送的长度转换成字节流
byte[] lengthbytes = ByteUtil.integerToBytes(length, 4);

//System.out.println("将要写过去的数据为:"+messes.length);

System.out.println("开始写socket到后台============================");

//把长度写过去
byteOut.write(lengthbytes);
//把内容写过去
byteOut.write(messes);

out.flush();

附ByteUtil方法:

public static byte[] integerToBytes(int integer, int len) {
//   if (integer < 0) { throw new IllegalArgumentException("Can not cast negative to bytes : " + integer); }
   ByteArrayOutputStream bo = new ByteArrayOutputStream();
   for (int i = 0; i < len; i ++) {
    bo.write(integer);
    integer = integer >> 8;
   }
   return bo.toByteArray();
}

服务端:

DataInputStream in = new DataInputStream(receiver.getSocket()
.getInputStream());

//读取长度
int len=ByteUtil.bytesToInteger(ByteUtil.readBytes(in,4));

//读取内容
String mess = new String(ByteUtil.readBytes(in, len)).trim();

附换转读取方法:
public static byte[] readBytes(InputStream in, long length) throws IOException {
   ByteArrayOutputStream bo = new ByteArrayOutputStream();
   byte[] buffer = new byte[1024];
   int read = 0;
   while (read < length) {
    int cur = in.read(buffer, 0, (int)Math.min(1024, length - read));
    if (cur < 0) { break; }
    read += cur;
    bo.write(buffer, 0, cur);
   }
   return bo.toByteArray();
}

public static int bytesToInteger(byte[] bytes)
{ return bytesToInteger(bytes, 0, bytes.length); }

这样写的socket程序的可容错性会更强.

http://hi.baidu.com/qinghua9/blog/item/71109422a9ae8dfbd7cae288.html

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