Gson list处理

Gson list处理，代码优化

源码片段

ParameterizedTypeImpl.class

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * <pre>
 * author : Haitao
 * e-mail : haitao_ni@foxmail.com
 * time   : 2017/08/07
 * desc   : Gson 反序列化Type类
 * version: 1.0
 * </pre>
 */

 
public class ParameterizedTypeImpl implements ParameterizedType {

    private final Class raw;
    private final Type[] args;

    public ParameterizedTypeImpl(Class raw, Type[] args) {
        this.raw = raw;
        this.args = args != null ? args : new Type[0];
    }

    @Override
    public Type[] getActualTypeArguments() {
        return args;
    }

    @Override
    public Type getRawType() {
        return raw;
    }

    @Override
    public Type getOwnerType() {
        return null;
    }
}

JSON2Class.class

import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;

import java.lang.reflect.Type;
import java.util.List;

/**
 * <pre>
 * author : Haitao
 * e-mail : haitao_ni@foxmail.com
 * time   : 2017/8/7
 * desc   : Json字符串转class
 * version: 1.0
 * </pre>
 */
public class JSON2Class {
    private static Gson mGson = new Gson();

    /**
     * json 字符串转Object
     * @param json
     * @param typeOfT
     * @param <T>
     * @return
     * @throws JsonSyntaxException
     */
    public static <T> T fromJsonObject(String json, Class<T> typeOfT) throws JsonSyntaxException {
        if (json == null) {
            return null;
        } else {
            return mGson.fromJson(json, typeOfT);
        }
    }

    /**
     * json字符串转List<T>
     * @param json
     * @param clazz
     * @param <T>
     * @return
     * @throws JsonSyntaxException
     */
    public static <T> List<T> fromJsonArray(String json, Class<T> clazz) throws JsonSyntaxException {
        if (json == null) {
            return null;
        } else {
            Type listType = new ParameterizedTypeImpl(List.class, new Class[]{clazz});
            return mGson.fromJson(json, listType);
        }
    }

    public static Gson getGson() {
        return mGson;
    }
}

使用示例

Model类 NoticeDBean.class

public class NoticeDBean {
  
    /**
     * "id": "1",
     * "title": "测试公告",
     * "createtime": "2017-07-18 21:50:33"
     */

    private String id;
    private String title;
    private String createtime;

    public String getId() {
        return this.id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getTitle() {
        return this.title;
    }
    public void setTitle(String title) {
        this.title = title;
    }

    public String getCreatetime() {
        return this.createtime;
    }

    public void setCreatetime(String createtime) {
        this.createtime = createtime;
    }

}

示例

String jsonObjectStr="{"id":"3","title":"测试公告","createtime":"2017-08-04 16:44:08"}";

String jsonArrayStr="[{"id":"3","title":"测试公告","createtime":"2017-08-04 16:44:08"},{"id":"3","title":"测试公告","createtime":"2017-08-04 16:44:08"}]";

NoticeDBean notice=JSON2Class.fromJsonObject(jsonObjectStr,NoticeDBean.class);

List<NoticeDBean> notice = JSON2Class.fromJsonArray(jsonArrayStr,NoticeDBean.class);