使用Gson解析Json数据

来源：互联网发布：淘宝商品下面的优惠券编辑：程序博客网时间：2024/05/17 04:25

最近在学习过程中使用到了使用Gson解析Json数据，解析过程中我们遇到的最大问题就是JavaBean的建立，一旦建立好了JavaBean,后面获取数据的过程也就事半功倍了。

下面是我在学习使用该方法的思路：1 首先看这段较为简单的Json数据:

{

"a":"10",

"b":[{"b1":"1","b2":"2"},{"b1":"3","b2":"4"} ],

"c":{"c1":"10","c2":"20"}}

我们知道，当我们使用jsonObject和JsonArray解析Json数据时"a":"10" 我们可以直接获取;[ ]我们可以当成JsonArray数组;{ }我们可以当成jsonObject对象,在Gson中创建JavaBean时是同样的思路

以下创建相对应的javaBean :

public class Data{
   public String a;
   public List<B> b;
   public C c;

   public static class B{
       public String b1;
       public String b2;
   }

   public static class C{
       public String c1;
       public String c2;
   }
}

这里的变量名，对象名，都必须和你的Json数据里面的键保持一致,

        Gson gson = new Gson();
       Type type = new TypeToken<Data>(){}.getType();
       Data data = gson.fromJson(result, type);

然后数据都在data里面了，取出来就可以了。

2 若碰到以下的Json数据：

{"users":
   {
       "code":"1001",
       "name":"JOHN",
       "kb":[
       {"detail":{"t1":"SQL","t2":"C语言","t3":"","t4":""},"weekday":"星期一"},
       {"detail":{"t1":"Java","t2":"J2EE","t3":"C","t4":""},"weekday":"星期二"},
       {"detail":{"t1":"AA","t2":"BB","t3":"DD","t4":""},"weekday":"星期三"},
       {"detail":{"t1":"AA","t2":"","t3":"","t4":""},"weekday":"星期四"},
       {"detail":{"t1":"","t2":"BB","t3":"","t4":"EE"},"weekday":"星期五"}
       ]
   }
}

思路也大致一样，在使用内部类嵌套时，一定要给该内部类加上static

相对应的javaBean :

public class Data {
   public Users users;

   public static class Users{
       public String code;
       public String name;
       public List<KB> kb;

       public static class KB{
           public Detail detail;
           public String weekday;

           public static class Detail{
               public String t1;
               public String t2;
               public String t3;
               public String t4;
               @Override
               public String toString() {
                   return "Detail [t1=" + t1 + ", t2=" + t2 + ", t3=" + t3
                           + ", t4=" + t4 + "]";
               }

           }
       }

   }
}

调用以下代码：

        Gson gson = new Gson();
       Type type = new TypeToken<Data>(){}.getType();
       Data data = gson.fromJson(result, type);
       Users users = data.users;
       String code = users.code;
       String name = users.name;
       Log.i("MainActivity", "code:" + code + ";name: " + name);
       List<KB> kb = users.kb;
       for (KB k: kb) {
           String weekday = k.weekday;
           Log.i("MainActivity", "weekday: "+ weekday);
           Detail detail = k.detail;
           Log.i("MainActivity", detail.toString());
       }

这样就能获取到我们想要的数据了，我这里只是两个复杂一点点的数据，还有更为复杂的思想大致也跟这个一样。在下面的文件中，我把相应的Gson框架传上去了，使用时需要导入gson-2.3.1.jar这个jar包，关联源码请看我的上篇文章

安卓导入源码

1 0