折腾小半天的问题,这里先感谢一下深圳的小伙子,远程帮我搞,虽然也没有搞出来==========FUCK
声明:Android开发下发生此异常,Java开发下并不会有这个问题
异常重现
简单说一下抛出异常的代码:
(1)解析json代码如下:
RecommendBean<RecommendListBean> obj = JSON.parseObject(jsonString, new TypeReference<RecommendBean<RecommendListBean>>(){});
RecommendListBean recommendListBean = (RecommendListBean) (obj.getData());
错误日志如下:
java.lang.ClassCastException: com.alibaba.fastjson.JSONObject cannot be cast to com.test.RecommendListBean
(2)model 如下:
package com.test; /**
* Created by Travis on 2017/8/20.
*/ public class RecommendBean<T> { private int status;
private String message;
private T data; public int getStatus() {
return status;
} public void setStatus(int status) {
this.status = status;
} public String getMessage() {
return message;
} public void setMessage(String message) {
this.message = message;
} public T getData() {
return data;
} public void setData(T data) {
this.data = data;
}
}
package com.test; import java.util.List; /**
* Created by lenovo on 2017/8/20.
*/ public class RecommendListBean { private int count;
private List<RecommendListItemBean> list; public int getCount() {
return count;
} public void setCount(int count) {
this.count = count;
} public List<RecommendListItemBean> getList() {
return list;
} public void setList(List<RecommendListItemBean> list) {
this.list = list;
} }
package com.test; import java.io.Serializable; /**
* Created by Travis on 2017/8/20.
*/ public class RecommendListItemBean implements Serializable {
private static final long serialVersionUID = 21455356667888L; private int uid;
private String nickname;
private int sex;
private int age;
private String avatar;
private String theme_pic;
private String job;
private String signature;
private String sound;
private int sound_length;
private int fee; public RecommendBean getRecommend() {
return recommend;
} public void setRecommend(RecommendBean recommend) {
this.recommend = recommend;
} private RecommendBean recommend; public int getUid() {
return uid;
} public void setUid(int uid) {
this.uid = uid;
} public String getNickname() {
return nickname;
} public void setNickname(String nickname) {
this.nickname = nickname;
} public int getSex() {
return sex;
} public void setSex(int sex) {
this.sex = sex;
} public int getAge() {
return age;
} public void setAge(int age) {
this.age = age;
} public String getAvatar() {
return avatar;
} public void setAvatar(String avatar) {
this.avatar = avatar;
} public String getTheme_pic() {
return theme_pic;
} public void setTheme_pic(String theme_pic) {
this.theme_pic = theme_pic;
} public String getJob() {
return job;
} public void setJob(String job) {
this.job = job;
} public String getSignature() {
return signature;
} public void setSignature(String signature) {
this.signature = signature;
} public static class RecommendBean<T> implements Serializable {
private static final long serialVersionUID = 21455356667889L; private int id;
private int user_id;
private int type;
private Object content;
private int zan;
private int status;
private String create_time;
private String update_time;
private int zanTotal;
private int commentTotal;
private T picture;
private T video; public int getType() {
return type;
} public void setType(int type) {
this.type = type;
} public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} public int getUser_id() {
return user_id;
} public void setUser_id(int user_id) {
this.user_id = user_id;
} public Object getContent() {
return content;
} public void setContent(Object content) {
this.content = content;
} public int getZan() {
return zan;
} public void setZan(int zan) {
this.zan = zan;
} public int getStatus() {
return status;
} public void setStatus(int status) {
this.status = status;
} public String getCreate_time() {
return create_time;
} public void setCreate_time(String create_time) {
this.create_time = create_time;
} public String getUpdate_time() {
return update_time;
} public void setUpdate_time(String update_time) {
this.update_time = update_time;
} public int getZanTotal() {
return zanTotal;
} public void setZanTotal(int zanTotal) {
this.zanTotal = zanTotal;
} public int getCommentTotal() {
return commentTotal;
} public void setCommentTotal(int commentTotal) {
this.commentTotal = commentTotal;
} public T getPicture() {
return picture;
} public void setPicture(T picture) {
this.picture = picture;
} public T getVideo() {
return video;
} public void setVideo(T video) {
this.video = video;
}
}
}
原因分析:
经过debug发现此处泛型所在的地方,仍然还是JSONObject,而没有解析成对应的对象,仅仅只是将obj解析成需要的实体对象了。
即使此处使用强转,仍然会有报错信息:cannot be cast to com.test.RecommendListBean
解决办法: 换用GSON来解析,具体方法如下
Gson gson = new Gson();
RecommendBean<RecommendListBean> obj = gson.fromJson(jsonString, new TypeToken<RecommendBean<RecommendListBean>>(){}.getType());
RecommendListBean recommendListBean = (RecommendListBean) (obj.getData());