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JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式。它基于ECMAScript的一个子集。
JSON采用完全独立于语言的文本格式，但是也使用了类似于C语言家族的习惯（包括C、C++、C#、Java、JavaScript、Perl、Python等）。
这些特性使JSON成为理想的数据交换语言。 易于人阅读和编写，同时也易于机器解析和生成(网络传输速率)。
GSON是由谷歌官方推出的 JSON 与 Java 对象转化的 Java类库
fast-json 阿里推出的用于Android平台的库，性能很好的Java实现的JSON 解析和生成器，据说功能强大且速度超越现有的所有库
GSON用法：
1. 解析JSONObject，JSONArray
2. 将JSON实体转化为JSON数据
工程导入三个包 fastjson， gson，volley
//从豆瓣网获取数据, 在 http://www.bejson.com/ 解析查看数据 private void getData() { StringRequest request = new StringRequest(url, new Listener<String>() { @Override public void onResponse(String arg0) { Log.i(TAG, arg0); //获取完成后，在 http://www.bejson.com/ 解析查看数据 dealData(arg0); } }, new ErrorListener() { @Override public void onErrorResponse(VolleyError arg0) { // TODO Auto-generated method stub } }); new Volley().newRequestQueue(getApplicationContext()).add(request); } //处理数据 private void dealData(String result){ Gson gson = new Gson(); Book book = gson.fromJson(result, Book.class); // data 转实体 Log.i(TAG, book.getTitle() + "; " + book.getPublisher() + ";" + book.getTags().size() + ";" ); }
private String TAG = "CARLOZ"; private String url = "https://api.douban.com/v2/book/1220562"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_jsonparse); getData(); }
Book属于实体类，详情，请查看代码GitHub
输出结果
08-10 21:19:22.321: I/CARLOZ(24911): {"rating":{"max":10,"numRaters":340,"average":"7.0","min":0},"subtitle":"","author":["[日] 片山恭一"],"pubdate":"2005-1","tags":[{"count":133,"name":"片山恭一","title":"片山恭一"},{"count":62,"name":"日本","title":"日本"},{"count":60,"name":"日本文学","title":"日本文学"},{"count":38,"name":"小说","title":"小说"},{"count":32,"name":"满月之夜白鲸现","title":"满月之夜白鲸现"},{"count":15,"name":"爱情","title":"爱情"},{"count":8,"name":"純愛","title":"純愛"},{"count":8,"name":"外国文学","title":"外国文学"}],"origin_title":"","image":"http:\/\/img3.douban.com\/mpic\/s1747553.jpg","binding":"平装","translator":["豫人"],"catalog":"\n ","pages":"180","images":{"small":"http:\/\/img3.douban.com\/spic\/s1747553.jpg","large":"http:\/\/img3.douban.com\/lpic\/s1747553.jpg","medium":"http:\/\/img3.douban.com\/mpic\/s1747553.jpg"},"alt":"http:\/\/book.douban.com\/subject\/1220562\/","id":"1220562","publisher":"青岛出版社","isbn10":"7543632608","isbn13":"9787543632608","title":"满月之夜白鲸现","url":"http:\/\/api.douban.com\/v2\/book\/1220562","alt_title":"","author_intro":"","summary":"那一年，是听莫扎特、钓鲈鱼和家庭破裂的一年。说到家庭破裂，母亲怪自己当初没有找到好男人，父亲则认为当时是被狐狸精迷住了眼，失常的是母亲，但出问题的是父亲……。","price":"15.00元"}
08-10 21:19:22.371: I/CARLOZ(24911): 满月之夜白鲸现; 青岛出版社;8;
Fast-json
public class FastJsonParseActivity extends Activity { private String TAG = "CARLOZ"; private String url = "https://api.douban.com/v2/book/1220562"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fast_json_parse); getData(); } private void getData() { StringRequest request = new StringRequest(url, new Listener<String>() { @Override public void onResponse(String arg0) { Log.i(TAG, arg0); dealData(arg0); } }, new ErrorListener() { @Override public void onErrorResponse(VolleyError arg0) { // TODO Auto-generated method stub } }); new Volley().newRequestQueue(getApplicationContext()).add(request); } // JSON data to java object private void dealData(String result) { Book book = JSON.parseObject(result, Book.class); Log.i(TAG, book.getTitle() + "; " + book.getPublisher() + ";" + book.getTags().size() + ";" ); } }
运行结果：
08-10 21:43:11.991: I/CARLOZ(28779): {"rating":{"max":10,"numRaters":340,"average":"7.0","min":0},"subtitle":"","author":["[日] 片山恭一"],"pubdate":"2005-1","tags":[{"count":133,"name":"片山恭一","title":"片山恭一"},{"count":62,"name":"日本","title":"日本"},{"count":60,"name":"日本文学","title":"日本文学"},{"count":38,"name":"小说","title":"小说"},{"count":32,"name":"满月之夜白鲸现","title":"满月之夜白鲸现"},{"count":15,"name":"爱情","title":"爱情"},{"count":8,"name":"純愛","title":"純愛"},{"count":8,"name":"外国文学","title":"外国文学"}],"origin_title":"","image":"http:\/\/img3.douban.com\/mpic\/s1747553.jpg","binding":"平装","translator":["豫人"],"catalog":"\n ","pages":"180","images":{"small":"http:\/\/img3.douban.com\/spic\/s1747553.jpg","large":"http:\/\/img3.douban.com\/lpic\/s1747553.jpg","medium":"http:\/\/img3.douban.com\/mpic\/s1747553.jpg"},"alt":"http:\/\/book.douban.com\/subject\/1220562\/","id":"1220562","publisher":"青岛出版社","isbn10":"7543632608","isbn13":"9787543632608","title":"满月之夜白鲸现","url":"http:\/\/api.douban.com\/v2\/book\/1220562","alt_title":"","author_intro":"","summary":"那一年，是听莫扎特、钓鲈鱼和家庭破裂的一年。说到家庭破裂，母亲怪自己当初没有找到好男人，父亲则认为当时是被狐狸精迷住了眼，失常的是母亲，但出问题的是父亲……。","price":"15.00元"}
08-10 21:43:12.101: I/CARLOZ(28779): 满月之夜白鲸现; 青岛出版社;8;
// object to JSON data
private void dealData(String result) { List<Book> books = JSON.parseObject(result, new TypeReference<List<Book>>(){}); Book book1 = new Book(); book1.setTitle("Hello CarloZ"); Book book2 = new Book(); book2.setTitle("Hello CarloZ"); Book book3 = new Book(); book3.setTitle("Hello CarloZ"); JSON.toJSON(book1); //book1 to JSON data JSON.toJSON(books); }
Android JSON 解析库的使用 - Gson 和 fast-json
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原文地址：http://www.cnblogs.com/carlo/p/4719290.html
