JsonUtils工具整理

import java.lang.reflect.Type;

import org.apache.commons.pool2.impl.GenericObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;

import com.google.gson.Gson;
public class JsonPoolUtils {

    private static ThreadLocal<JsonPoolUtils> instance = new ThreadLocal<JsonPoolUtils>();

    protected static GenericObjectPool<Gson> pool;

    static {
        if (instance.get() == null || pool == null) {
            GenericObjectPoolConfig conf = new GenericObjectPoolConfig();
            conf.setMaxTotal(32);
            conf.setMaxIdle(4);
            pool = new GenericObjectPool<Gson>(new PooledGsonFactory(), conf);
        }
    }

    public final static <T> T fromJson(String json, Type typeOfT) {
        if (json == null) {
            return null;
        }
        Gson gson = null;
        try {
            gson = pool.borrowObject();
        } catch (Exception e) {
            e.printStackTrace();
        }
        T t = gson.fromJson(json, typeOfT);
        pool.returnObject(gson);
        return t;
    }

    public final static String toJson(Object src) {
        if (src == null) {
            return null;
        }
        Gson gson = null;
        try {
            gson = pool.borrowObject();
        } catch (Exception e) {
            e.printStackTrace();
        }
        String string = gson.toJson(src);
        pool.returnObject(gson);
        return string;
    }
}

import java.sql.Timestamp;

import org.apache.commons.pool2.BasePooledObjectFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.DefaultPooledObject;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class PooledGsonFactory extends BasePooledObjectFactory<Gson> {

    @Override
    public Gson create() throws Exception {
        return new GsonBuilder().registerTypeAdapter(Timestamp.class, new TimestampTypeAdapter()).create();
    }

    @Override
    public PooledObject<Gson> wrap(Gson obj) {
        return new DefaultPooledObject<Gson>(obj);
    }

}