Gson基本使用

Gson的基本用法：

定义实体类

将JSON生成单个实体或列表实体集合

使用Gson解析JSONObject

使用Gson解析JSONArray

使用Gson将实体转为JSON数据

使用Gson时需要注意名字和JSON数据中的相同

简单来讲就是根据json的数据结构定义出相应的javabean --->

"new"出Gson的实例gson---->

gson.fromJson(jsonString,JavaBean.class) 即可.

JSON数据来源：https://api.douban.com/v2/book/1220562

Book.java

public class Book {

private String title;

private String publisher;

private String summary;

private ArrayList<Tag> tags;

public ArrayList<Tag> getTags() {
return tags;
}

public void setTags(ArrayList<Tag> tags) {
this.tags = tags;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getPublisher() {
return publisher;
}

public void setPublisher(String publisher) {
this.publisher = publisher;
}

public String getSummary() {
return summary;
}

public void setSummary(String summary) {
this.summary = summary;
}

}

Tag.java

public class Tag {

private String count;

private String name;

private String title;

public String getCount() {
return count;
}

public void setCount(String count) {
this.count = count;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

}

MainActivity.java

public class MainActivity extends AppCompatActivity {

private String url = "https://api.douban.com/v2/book/1220562";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getData();
}

private void getData() {
StringRequest request = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String s) {
Log.d("MainActivity", s);
dealData(s);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {

}
});
new Volley().newRequestQueue(getApplicationContext()).add(request);
}

private void dealData(String s) {
Gson gson = new Gson();
Book book = gson.fromJson(s, Book.class);
Log.i("MainActivity", book.getTitle() + ":" + book.getPublisher() + ":" + book.getTags().size());
}

}

此处涉及了Volley开源框架的基本使用
不熟悉可以移步至郭霖菊苣的博客：http://blog.csdn.net/guolin_blog/article/details/17482095/

Gson jar包下载地址：http://download.csdn.net/detail/duanliuchang/9667168

Volley jar包下载地址：http://download.csdn.net/detail/duanliuchang/9667177

源码：http://download.csdn.net/detail/duanliuchang/9667176