Java socket编程客户端读取数据不完整

今天在用java socket读取服务器端发送的数据时，发现只能读取服务器端发送的部分数据，无法完整读取服务器端的数据。数据大概有7W多个字节。

原代码如下：
    private String getSocketDCCReceiveCCA() throws IOException{
InputStream stream=socket.getInputStream();
byte[] rb = new byte[8];
socket.getInputStream().read(rb);
                  //前8个字节是整个xml数据的长度(十六进制)
int rLen =b2i(rb);
Log.info("转换后的rLen长度为:"+rLen);
byte[] read = new byte[rLen - 8];
                  //一次性读取数据的长度（这里有7W多个字节）
socket.getInputStream().read(read);
                  //对数据进行编码转换
String re = new String(CheckUnicodeString(read), "UTF-8");
                  return re;
         }


请各位帮忙看看，为什么服务器端返回的字符串有7W多个，而我这边只接收到几千个字节。



=============================================================================

完整读取socket返回值的方法：

private String getSocketDCCReceiveCCA() throws IOException{
InputStream stream=socket.getInputStream();
byte[] rb = new byte[8];
socket.getInputStream().read(rb);
Log.info("rb1==="+new String(rb));
int rLen =b2i(rb);
Log.info("after change rLen.length=:"+rLen);

StringBuffer stringBuffer=new StringBuffer();
byte[] c; 
int i=0; //每次实际读取的字节数
int count=0; //已经读取的字节数
c=new byte[rLen-count];
i=socket.getInputStream().read(c);
//Log.info("打印i的值="+i);
count=count+i;
//Log.info("打印count的值="+count);
//总的字节数减去已经读取的字节数就是下次要读取的字节数
//Log.info("打印数组c的值=="+new String(c).trim());
stringBuffer.append(new String(c,0,i,"UTF-8").trim());
while(count!=(rLen-8)){
//继续读取字节
c=new byte[rLen-count];
i=socket.getInputStream().read(c);
//Log.info("循环打印i的值="+i);
count=count+i;
//Log.info("循环打印count的值="+count);
stringBuffer.append(new String(c,0,i,"UTF-8").trim());
//Log.info("循环打印数组c的值="+new String(c).trim());
}

Log.info("新的方式得到的字符串为："+stringBuffer.toString());
//return new String(CheckUnicodeString(stringBuffer.toString().getBytes()),"UTF-8");
return stringBuffer.toString();

}