《一种从JSON数据创建Java类的高效办法》

作者：chszs，转载需注明。博客主页：http://blog.csdn.net/chszs

JSON格式的数据经常会遇到，比如调用Web服务，取回的数据通常就是JSON格式的。如何高效地把JSON数据转换成实际的Java类对象，就是本文要说明的问题。

写一个操纵JSON数据的Java程序，通常代码会重度依赖于JSON API，你总是需要对JSON数据进行反序列化，再转换成原生Java对象。整个过程大致如下：

1）下载所有的JSON响应；

2）分析JSON对象的结构，映射到Java类；

3）手动煞费苦心地创建每一个Java类，键入每个Java类的私有属性名和数据类型，以匹配JSON所有对象的属性；

4）为每个Java类创建public类型的getter和setter方法。

package com.cypressnorth.demo.models.twitter;
 
import java.util.List;
 
public class TwitterItem{
    private String contributors;
    private transient Geo coordinates;
    private String created_at;
    private Entities entities;
    private Number favorite_count;
    private boolean favorited;
    private Geo geo;
    private Number id;
    private String id_str;
    private String in_reply_to_screen_name;
    private String in_reply_to_status_id;
    private String in_reply_to_status_id_str;
    private String in_reply_to_user_id;
    private String in_reply_to_user_id_str;
    private String lang;
    private boolean possibly_sensitive;
    private Number retweet_count;
    private boolean retweeted;
    private Retweeted_status retweeted_status;
    private String source;
    private String text;
    private boolean truncated;
    private User user;
 
    public TwitterItem(){}
 
    public String getContributors(){
        return this.contributors;
    }
    public void setContributors(String contributors){
        this.contributors = contributors;
    }
    public Geo getCoordinates(){
        return this.coordinates;
    }
    public void setCoordinates(Geo coordinates){
        this.coordinates = coordinates;
    }
    public String getCreated_at(){
        return this.created_at;
    }
    public void setCreated_at(String created_at){
        this.created_at = created_at;
    }
    public Entities getEntities(){
        return this.entities;
    }
    public void setEntities(Entities entities){
        this.entities = entities;
    }
    public Number getFavorite_count(){
        return this.favorite_count;
    }
    public void setFavorite_count(Number favorite_count){
        this.favorite_count = favorite_count;
    }
    public boolean getFavorited(){
        return this.favorited;
    }
    public void setFavorited(boolean favorited){
        this.favorited = favorited;
    }
    public Geo getGeo(){
        return this.geo;
    }
    public void setGeo(Geo geo){
        this.geo = geo;
    }
    public Number getId(){
        return this.id;
    }
    public void setId(Number id){
        this.id = id;
    }
    public String getId_str(){
        return this.id_str;
    }
    public void setId_str(String id_str){
        this.id_str = id_str;
    }
    public String getIn_reply_to_screen_name(){
        return this.in_reply_to_screen_name;
    }
    public void setIn_reply_to_screen_name(String in_reply_to_screen_name){
        this.in_reply_to_screen_name = in_reply_to_screen_name;
    }
    public String getIn_reply_to_status_id(){
        return this.in_reply_to_status_id;
    }
    public void setIn_reply_to_status_id(String in_reply_to_status_id){
        this.in_reply_to_status_id = in_reply_to_status_id;
    }
    public String getIn_reply_to_status_id_str(){
        return this.in_reply_to_status_id_str;
    }
    public void setIn_reply_to_status_id_str(String in_reply_to_status_id_str){
        this.in_reply_to_status_id_str = in_reply_to_status_id_str;
    }
    public String getIn_reply_to_user_id(){
        return this.in_reply_to_user_id;
    }
    public void setIn_reply_to_user_id(String in_reply_to_user_id){
        this.in_reply_to_user_id = in_reply_to_user_id;
    }
    public String getIn_reply_to_user_id_str(){
        return this.in_reply_to_user_id_str;
    }
    public void setIn_reply_to_user_id_str(String in_reply_to_user_id_str){
        this.in_reply_to_user_id_str = in_reply_to_use