protostuff是一个支持各种格式的一个序列化Java类库，包括JSON、XML、YAML等格式。
示例代码：
public class UserSchema implements Schema<User>{ public boolean isInitialized(User user) { return user.getEmail() != null; } public void mergeFrom(Input input, User user) throws IOException { while(true) { int number = input.readFieldNumber(this); switch(number) { case 0: return; case 1: user.setEmail(input.readString()); break; case 2: user.setFirstName(input.readString()); break; case 3: user.setLastName(input.readString()); break; case 4: if(message.friends == null) message.friends = new ArrayList<User>(); message.friends.add(input.mergeObject(null, this)); break; default: input.handleUnknownField(number, this); } } } public void writeTo(Output output, User user) throws IOException { if(user.getEmail() == null) throw new UninitializedMessageException(user, this); output.writeString(1, user.getEmail(), false); if(user.getFirstName() != null) output.writeString(2, user.getFirstName(), false); if(user.getLastName() != null) output.writeString(3, user.getLastName(), false); if(message.friends != null) { for(User friend : message.friends) { if(friend != null) output.writeObject(4, friend, this, true); } } } public User newMessage() { return new User(); } public Class<User> typeClass() { return User.class; } public String messageName() { return User.class.getSimpleName(); } public String messageFullName() { return User.class.getName(); } // the mapping between the field names to the field numbers. public String getFieldName(int number) { switch(number) { case 1: return "email"; case 2: return "firstName"; case 3: return "lastName"; case 4: return "friends"; default: return null; } } public int getFieldNumber(String name) { Integer number = fieldMap.get(name); return number == null ? 0 : number.intValue(); } private static final HashMap<String,Integer> fieldMap = new HashMap<String,Integer>(); static { fieldMap.put("email", 1); fieldMap.put("firstName", 2); fieldMap.put("lastName", 3); fieldMap.put("friends", 4); }}
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