java.io.ObjectOutputStream.putFields()和java.io.ObjectInputStream. readFields()

在自定义序列化和反序列化时，java.io.ObjectOutputStream.putFields()和java.io.ObjectInputStream.readFields()非常有用。

a)      java.io.ObjectOutputStream.PutField  java.io.ObjectOutputStream.putFields()

在 Java 语言中，此方法返回用于缓冲要写入到输出流中的字段的 ObjectOutputStream.PutField 对象，然后可以调用PutField类的一些方法对缓冲的对象的各个成员进行操作，操作完之后，调用java.io.ObjectOutputStream.writeFields()将此对象写入到输出流中。

示例：

         private voidwriteObject(ObjectOutputStream out) {

               try {

                         PutField putFields = out.putFields();

                         System.out.println("原密码:" + password);

                         password = "encryption";//模拟加密

                         putFields.put("password", password);//成员名为password 

                         System.out.println("加密后的密码" + password);

                         out.writeFields();

                } catch (IOException e) {

                         e.printStackTrace();

                    }

                }

b)     java.io.ObjectInputStream.GetField  java.io.ObjectInputStream. readFields()

在 Java 语言中，此方法从输入流读取字段，然后按字段名访问各字段数值。

示例：

private void readObject(ObjectInputStream in) {

            try {

                     GetField readFields = in.readFields();

                     Object object = readFields.get("password", "");

                     System.out.println("要解密的字符串:" + object.toString());

                     password = "pass";//模拟解密,需要获得本地的密钥

            } catch (IOException e) {

                     e.printStackTrace();

            } catch (ClassNotFoundException e) {

                     e.printStackTrace();

                  }

            }

       示例取自《Java序列化高级知识》（2013-03http://blog.csdn.net/xiaogugood/article/details/8641059）