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数据很不错。

相关的演示样例代码：

{
  "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作为一个JSON处理库的工具，这也很容易使用。