后来找到方法了，
直接序列化对象就可以了。
这是抄来的部分代码：
URL studentDBservlet = new URL( servletLocation );
URLConnection servletConnection = studentDBservlet.openConnection();
// Don't used a cached version of URL connection.
servletConnection.setUseCaches (false);
servletConnection.setDefaultUseCaches(false);
// Read the input from the servlet.
//
// The servlet will return a serialized vector containing
// student entries.
//
inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());
studentVector = (Vector) inputFromServlet.readObject();
先试试看能不能实现。呵呵。
