com.ab.util.AbJsonUtil.java Source code

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Here is the source code for com.ab.util.AbJsonUtil.java

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/*
 * Copyright (C) 2012 www.amsoft.cn
 * 
 * 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 com.ab.util;

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

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

// TODO: Auto-generated Javadoc

/**
 *  2012 amsoft.cn 
 * ??AbStrUtil.java 
 * ??json?.
 *
 * @author 
 * @version v1.0
 * @date2013-01-17 ?11:52:13
 * @param <T>
 */
public class AbJsonUtil<T> {

    /**
     * 
     * ??json.
     * @param list
     * @return
     */
    public static String toJson(Object src) {
        String json = null;
        try {
            GsonBuilder gsonb = new GsonBuilder();
            Gson gson = gsonb.create();
            json = gson.toJson(src);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return json;
    }

    /**
     * 
     * ??json.
     * @param list
     * @return
     */
    public static String toJson(List<?> list) {
        String json = null;
        try {
            GsonBuilder gsonb = new GsonBuilder();
            Gson gson = gsonb.create();
            json = gson.toJson(list);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return json;
    }

    /**
     * 
     * ??json.
     * @param json
     * @param typeToken new TypeToken<ArrayList<?>>() {};
     * @return
     */
    public static List<?> fromJson(String json, TypeToken typeToken) {
        List<?> list = null;
        try {
            GsonBuilder gsonb = new GsonBuilder();
            Gson gson = gsonb.create();
            Type type = typeToken.getType();
            list = gson.fromJson(json, type);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 
     * ??json.
     * @param json
     * @param clazz
     * @return
     */
    public static Object fromJson(String json, Class clazz) {
        Object obj = null;
        try {
            GsonBuilder gsonb = new GsonBuilder();
            Gson gson = gsonb.create();
            obj = gson.fromJson(json, clazz);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return obj;
    }

    /**
      * The main method.
      *
      * @param args the arguments
      */
    public static void main(String[] args) {
        List<User> list = (List<User>) fromJson("[{id:1,name:22},{id:2,name:33}]",
                new TypeToken<ArrayList<User>>() {
                });
        System.out.println(list.size());
        for (User u : list) {
            System.out.println(u.getName());
        }

        User u = (User) fromJson("{id:1,name:22}", User.class);
        System.out.println(u.getName());
    }

    static class User {
        String id;
        String name;

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

    }

}