Android Open Source - doubanbook4android Json Util

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Java Source Code

package com.study.doubanbook_for_android.utils;
/*w w w.ja va 2s .  c  o  m*/
import java.lang.reflect.Type;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;

import android.net.ParseException;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.reflect.TypeToken;

/**
 * Gson?????????????????json?????????Gson???????
 * 
 * @author tezuka-pc
 */
public class JsonUtil {

  private static Gson gson = null;

  static {
    if (gson == null) {
      gson = new Gson();
    }
  }

  private JsonUtil() {

  }

  public static <T> T fromJsonObject(String json, Class<T> classOfT) {
    return gson.fromJson(json, classOfT);
  }

  public static <T> String toJsonObject(T t) {
    return gson.toJson(t);
  }

  public static <T> List<T> fromJsonArray(String json, Type type) {
    return gson.fromJson(json, type);
  }

  public static <T> String toJsonArray(List<T> list, Type type) {
    return gson.toJson(list, type);
  }

  /**
   * ?????????json???
   * 
   * @param ts
   * @return
   */
  public static String objectToJson(Object ts) {
    String jsonStr = null;
    if (gson != null) {
      jsonStr = gson.toJson(ts);
    }
    return jsonStr;
  }

  /**
   * ?????????json???(?????????)
   * 
   * @param ts
   * @return
   */
  public static String objectToJsonDateSerializer(Object ts,
      final String dateformat) {
    String jsonStr = null;
    gson = new GsonBuilder()
        .registerTypeHierarchyAdapter(Date.class,
            new JsonSerializer<Date>() {
              public JsonElement serialize(Date src,
                  Type typeOfSrc,
                  JsonSerializationContext context) {
                SimpleDateFormat format = new SimpleDateFormat(
                    dateformat);
                return new JsonPrimitive(format.format(src));
              }
            }).setDateFormat(dateformat).create();
    if (gson != null) {
      jsonStr = gson.toJson(ts);
    }
    return jsonStr;
  }

  /**
   * ?json?????????list??
   * 
   * @param jsonStr
   * @return
   */
  public static List<?> jsonToList(String jsonStr) {
    List<?> objList = null;
    if (gson != null) {
      Type type = new TypeToken<List<?>>() {
      }.getType();
      objList = gson.fromJson(jsonStr, type);
    }
    return objList;
  }

  /**
   * ?json?????????list??????????
   * 
   * @param jsonStr
   * @param type
   * @return
   */
  public static List<?> jsonToList(String jsonStr, Type type) {
    List<?> objList = null;
    if (gson != null) {
      objList = gson.fromJson(jsonStr, type);
    }
    return objList;
  }

  /**
   * ?json?????????map??
   * 
   * @param jsonStr
   * @return
   */
  public static Map<?, ?> jsonToMap(String jsonStr) {
    Map<?, ?> objMap = null;
    if (gson != null) {
      Type type = new TypeToken<Map<?, ?>>() {
      }.getType();
      objMap = gson.fromJson(jsonStr, type);
    }
    return objMap;
  }

  /**
   * ?json??????bean??
   * 
   * @param jsonStr
   * @return
   */
  public static Object jsonToBean(String jsonStr, Class<?> cl) {
    Object obj = null;
    if (gson != null) {
      obj = gson.fromJson(jsonStr, cl);
    }
    return obj;
  }

  /**
   * ?json??????bean??
   * 
   * @param jsonStr
   * @param cl
   * @return
   */
  @SuppressWarnings("unchecked")
  public static <T> T jsonToBeanDateSerializer(String jsonStr, Class<T> cl,
      final String pattern) {
    Object obj = null;
    gson = new GsonBuilder()
        .registerTypeAdapter(Date.class, new JsonDeserializer<Date>() {
          public Date deserialize(JsonElement json, Type typeOfT,
              JsonDeserializationContext context)
              throws JsonParseException {
            SimpleDateFormat format = new SimpleDateFormat(pattern);
            String dateStr = json.getAsString();
            try {
              return format.parse(dateStr);
            } catch (ParseException e) {
              e.printStackTrace();
            } catch (java.text.ParseException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
            }
            return null;
          }
        }).setDateFormat(pattern).create();
    if (gson != null) {
      obj = gson.fromJson(jsonStr, cl);
    }
    return (T) obj;
  }

  /**
   * ????
   * 
   * @param jsonStr
   * @param key
   * @return
   */
  public static Object getJsonValue(String jsonStr, String key) {
    Object rulsObj = null;
    Map<?, ?> rulsMap = jsonToMap(jsonStr);
    if (rulsMap != null && rulsMap.size() > 0) {
      rulsObj = rulsMap.get(key);
    }
    return rulsObj;
  }

}

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