org.yx.common.DateTimeTypeAdapter.java Source code

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Here is the source code for org.yx.common.DateTimeTypeAdapter.java

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/**
 * Copyright (C) 2016 - 2017 youtongluan.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.yx.common;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;

public class DateTimeTypeAdapter extends TypeAdapter<Date> {

    @Override
    public Date read(JsonReader in) throws IOException {
        if (in.peek() == JsonToken.NULL) {
            in.nextNull();
            return null;
        }
        return deserializeToDate(in.nextString());
    }

    private Date deserializeToDate(final String json) throws IOException {
        if (json == null) {
            return null;
        }

        if (json.contains(":")) {
            SimpleDateFormat format = null;
            if (json.length() == 19) {
                format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            } else if (json.length() == 23) {
                format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
            }
            if (format != null) {
                try {
                    return format.parse(json);
                } catch (Exception e) {
                }
            }
            throw new IOException(json + " cannot convert to Date");
        }

        String num = json;
        if (num.contains(".")) {

            num = num.substring(0, num.indexOf("."));
        }
        return new Date(Long.parseLong(num));
    }

    @Override
    public void write(JsonWriter out, Date value) throws IOException {
        if (value == null) {
            out.nullValue();
            return;
        }
        out.value(value.getTime());
    }

}