Table of Contents
1.首先,我是从服务器端传回来的JSON数据如下:
2.然后我用 Gson 去解析以上这一段JSON,代码如下:
3.最后贴上 UserBean.class 的代码。。。
回复内容:
Home Backend Development PHP Tutorial 关于 Gson 解析JSON数据。。。

关于 Gson 解析JSON数据。。。

Jun 06, 2016 pm 08:18 PM
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1.首先,我是从服务器端传回来的JSON数据如下:

<code>{"info":"succeed","user_id":"1","user_password":"9999","user_email":"95469@qq.com","user_nicheng":"\u6817\u5b50","user_sex":"\u7537","user_phone":"13590272662","user_add":null,"user_qianming":"\u5199\u4e0a\u4e00\u53e5\u8bdd\uff0c\u54f2\u7406\u4eba\u751f\u3002__by_\u6817\u5b50"}
</code>
Copy after login
Copy after login

信息大概是:info,user_id,user_password,user_email,user_nicheng,
user_sex,user_phone,user_add,user_qianming

2.然后我用 Gson 去解析以上这一段JSON,代码如下:

<code>UserBean user = new Gson().fromJson(string, UserBean.class);
</code>
Copy after login
Copy after login

3.最后贴上 UserBean.class 的代码。。。

<code>public class UserBean implements IUserBean{

    String info;
    int userId;
    String userEmail;
    String userNicheng;
    String userSex;
    String userPhone;
    String userAdd;
    String userQianming;
   //还有以下的 setXXX , getXXX 方法就忽略了</code>
Copy after login
Copy after login

然后问题是解析出来的 UserBean 的对象 user 中,只有info,userId是有值得,其他没有值,这是怎么回事。。。?
还有,Gson 中的fromJson方法,对我自定义的 UserBean 有什么要求吗?

回复内容:

1.首先,我是从服务器端传回来的JSON数据如下:

<code>{"info":"succeed","user_id":"1","user_password":"9999","user_email":"95469@qq.com","user_nicheng":"\u6817\u5b50","user_sex":"\u7537","user_phone":"13590272662","user_add":null,"user_qianming":"\u5199\u4e0a\u4e00\u53e5\u8bdd\uff0c\u54f2\u7406\u4eba\u751f\u3002__by_\u6817\u5b50"}
</code>
Copy after login
Copy after login

信息大概是:info,user_id,user_password,user_email,user_nicheng,
user_sex,user_phone,user_add,user_qianming

2.然后我用 Gson 去解析以上这一段JSON,代码如下:

<code>UserBean user = new Gson().fromJson(string, UserBean.class);
</code>
Copy after login
Copy after login

3.最后贴上 UserBean.class 的代码。。。

<code>public class UserBean implements IUserBean{

    String info;
    int userId;
    String userEmail;
    String userNicheng;
    String userSex;
    String userPhone;
    String userAdd;
    String userQianming;
   //还有以下的 setXXX , getXXX 方法就忽略了</code>
Copy after login
Copy after login

然后问题是解析出来的 UserBean 的对象 user 中,只有info,userId是有值得,其他没有值,这是怎么回事。。。?
还有,Gson 中的fromJson方法,对我自定义的 UserBean 有什么要求吗?

info有值因为JSON里有info
其他没有值是因为class的member在JSON里不存在(GSON不会把JSON的user_email填到java的userEmail)
userId有值因为.. java的int一定有一个值


gson没啥特别的坑.. 有个无参数无依赖的构造函数就能用 (也就是说非static的inner class不可以. 如果没有就要自己写一个InstanceCreator)

<code>public class Book implements Serializable {

    @SerializedName("jcId")
    private String bookId;
    
    ... 省略set get 方法
    
}


json 串里是jcId, 用注解和bookId 就可以绑定在一起呢</code>
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