使用Gson将json格式字符串数据转化为对象list的情况中，经常出现json格式字符串参数个数与要转换的类对象不匹配情况，如类对象定义有多个参数，但是json格式字符串只有其中的一部分，这时候直接调用Gson 提供的 T fromJson(String json, Type typeOfT)方法转换会报错，会提示json格式转换不匹配错误。
下面例子的方法可以解决这个问题。
1. 对象类定义：
public class Content implements Serializable {
private int formType;
private String name;
private String country;
private int intergrity;
private int broadcastType;
private String broadcastAge;
private String issuer;
private String language;
private String url;
private int currentTime;
private String contentId;
private String pContentId;
private int next;
public Content() {
}
public int getFormType() {
return this.formType;
}
public void setFormType(int formType) {
this.formType = formType;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getCountry() {
return this.country;
}
public void setCountry(String country) {
this.country = country;
}
public int getIntergrity() {
return this.intergrity;
}
public void setIntergrity(int intergrity) {
this.intergrity = intergrity;
}
public int getBroadcastType() {
return this.broadcastType;
}
public void setBroadcastType(int broadcastType) {
this.broadcastType = broadcastType;
}
public String getBroadcastAge() {
return this.broadcastAge;
}
public void setBroadcastAge(String broadcastAge) {
this.broadcastAge = broadcastAge;
}
public String getIssuer() {
return this.issuer;
}
public void setIssuer(String issuer) {
this.issuer = issuer;
}
public String getLanguage() {
return this.language;
}
public void setLanguage(String language) {
this.language = language;
}
public String getUrl() {
return this.url;
}
public void setUrl(String url) {
this.url = url;
}
public int getCurrentTime() {
return this.currentTime;
}
public void setCurrentTime(int currentTime) {
this.currentTime = currentTime;
}
public String getContentId() {
return this.contentId;
}
public void setContentId(String contentId) {
this.contentId = contentId;
}
public String getPContentId() {
return this.pContentId;
}
public void setPContentId(String pContentId) {
this.pContentId = pContentId;
}
public int getNext() {
return this.next;
}
public void setNext(int next) {
this.next = next;
}
public String toString() {
return "Content{formType=" + this.formType + ", name='" + this.name + '\'' + ", country='" + this.country + '\'' + ", intergrity=" + this.intergrity + ", broadcastType=" + this.broadcastType + ", broadcastAge='" + this.broadcastAge + '\'' + ", issuer='" + this.issuer + '\'' + ", language='" + this.language + '\'' + ", url='" + this.url + '\'' + ", currentTime=" + this.currentTime + ", contentId='" + this.contentId + '\'' + ", pContentId='" + this.pContentId + '\'' + ", next=" + this.next + '}';
}
}
2. json 格式字符串数组:
[
{
"Content": [
{
"url": "",
"currentTime": 0,
"contentId": 631584528
}
]
}
]
3. 转换方式为
（1） 新建一个java类，类名称叫DataBean,类代码如下：
public class DataBean {
List <Content > Content;
public List getContent() {
returnContent;
}
public void setContent(List content) {
this.Content= content;
}
}
(2) 调用Gson解析
Gson gson =new Gson();
Type type =newTypeToken<ArrayList<DataBean>>() {
}.getType();
List rs = gson.fromJson(data, type); //data就是2里面的json格式字符串数组
List<Content> contents = rs.get(0).getContent();
这样就可以获取到Content类型的对象列表，对于json格式字符串数组中缺少的参数，Gson会自动加上，参数值为参数初始化的默认值。
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