Jackson是一款为Java平台提供的一套数据处理类库工具，Jackson的主要功能是提供JSON解析和生成，另外，Jackson还提供额外的类库以支持处理Avro, CBOR, CSV, Smile, XML 和 YAML，功能十分强大，在Java中处理JSON数据非常不错。

相关的示例代码：

{    "name" : { "first" : "Joe", "last" : "Sixpack" },    "gender" : "MALE",    "verified" : false,    "userImage" : "Rm9vYmFyIQ=="  }

public class User {      public enum Gender { MALE, FEMALE };        public static class Name {        private String _first, _last;          public String getFirst() { return _first; }        public String getLast() { return _last; }          public void setFirst(String s) { _first = s; }        public void setLast(String s) { _last = s; }      }        private Gender _gender;      private Name _name;      private boolean _isVerified;      private byte[] _userImage;        public Name getName() { return _name; }      public boolean isVerified() { return _isVerified; }      public Gender getGender() { return _gender; }      public byte[] getUserImage() { return _userImage; }        public void setName(Name n) { _name = n; }      public void setVerified(boolean b) { _isVerified = b; }      public void setGender(Gender g) { _gender = g; }      public void setUserImage(byte[] b) { _userImage = b; }  }

ObjectMapper mapper = new ObjectMapper(); // can reuse, share globally  User user = mapper.readValue(new File("user.json"), User.class);

Jackson作为一款JSON处理类库工具，使用起来也非常方便。

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