Java JSON processing class library Jackson

Java JSON processing class library Jackson

Jackson is a set of data processing class libraries provided for the Java platform. Jackson's main function is to provide JSON parsing and generation. In addition, Jackson also provides additional class libraries to support Avro, CBOR, CSV, Smile, XML, and YAML have powerful functions and are very good at processing JSON data in Java.

Related sample code:

{  "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 globallyUser user = mapper.readValue(new File("user.json"), User.class);

Jackson, as a JSON processing class library tool, is also very convenient to use.