json相关

一、GSON操作
import com.google.gson.Gson;

ContractDTO contract = null;
        try {
            Map result = quotationInfoDAO.queryQuoteDataByQuotationNo(quotationNo);
            if (CommonFunctions.isMapEmpty(result))
                return contract;
            String latestQuoteData = (String) result.get("latestQuoteData");
            //JSONObject json = JSONObject.fromObject(latestQuoteData);
            //contract = (ContractDTO) JSONObject.toBean(json, ContractDTO.class);
            Gson gson = new Gson();
            contract = gson.fromJson(latestQuoteData, ContractDTO.class);
        } catch (Exception ex) {
            LogUtils.error("查询财意报价单clob异常，参数quotationNo:" + quotationNo, ex);
        }

二、json
package com.paic.icore.acss.util;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.sf.ezmorph.Morpher;
import net.sf.ezmorph.MorpherRegistry;
import net.sf.ezmorph.bean.BeanMorpher;
import net.sf.ezmorph.object.DateMorpher;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;
import net.sf.json.util.JSONUtils;

import com.paic.icore.acss.util.enumeration.DateStyle;

/**
* Json转换工具类
* @author ZHANGYUNPENG048
*
*/
public class JsonUtils {
    /**
     * 从一个JSON 对象字符格式中得到一个java对象，形如：
     * {"id" : idValue, "name" : nameValue, "aBean" : {"aBeanId" : aBeanIdValue, ...}}
     * @param object
     * @param clazz
     * @return
     */
    public static Object getDTO(String jsonString, Class clazz) {
        JSONObject jsonObject = null;
        setDateFormat2JAVA();
        jsonObject = JSONObject.fromObject(jsonString);
        return JSONObject.toBean(jsonObject, clazz);
    }

    /**
     * 从一个JSON 对象字符格式中得到一个java对象，其中beansList是一类的集合，形如：
     * {"id" : idValue, "name" : nameValue, "aBean" : {"aBeanId" : aBeanIdValue, ...},
     * beansList:[{}, {}, ...]}
     * @param jsonString
     * @param clazz
     * @param map 集合属性的类型 (key : 集合属性名, value : 集合属性类型class) eg: ("beansList" : Bean.class)
     * @return
     */
    public static Object getDTO(String jsonString, Class clazz, Map map) {
        JSONObject jsonObject = null;
        setDateFormat2JAVA();
        jsonObject = JSONObject.fromObject(jsonString);
        return JSONObject.toBean(jsonObject, clazz, map);
    }

    /**
     * 从一个JSON数组得到一个java对象数组，形如：
     * [{"id" : idValue, "name" : nameValue}, {"id" : idValue, "name" : nameValue}, ...]
     * @param object
     * @param clazz
     * @return
     */
    public static Object[] getDTOArray(String jsonString, Class clazz) {
        setDateFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        Object[] obj = new Object[array.size()];
        for (int i = 0; i < array.size(); i++) {
            JSONObject jsonObject = array.getJSONObject(i);
            obj[i] = JSONObject.toBean(jsonObject, clazz);
        }
        return obj;
    }

    /**
     * 从一个JSON数组得到一个java对象数组，形如：
     * [{"id" : idValue, "name" : nameValue}, {"id" : idValue, "name" : nameValue}, ...]
     * @param object
     * @param clazz
     * @param map
     * @return
     */
    public static Object[] getDTOArray(String jsonString, Class clazz, Map map) {
        setDateFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        Object[] obj = new Object[array.size()];
        for (int i = 0; i < array.size(); i++) {
            JSONObject jsonObject = array.getJSONObject(i);
            obj[i] = JSONObject.toBean(jsonObject, clazz, map);
        }
        return obj;
    }

    /**
     * 从一个JSON数组得到一个java对象集合
     * @param object
     * @param clazz
     * @return
     */
    public static List getDTOList(String jsonString, Class clazz) {
        setDateFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        List list = new ArrayList();
        for (Iterator iter = array.iterator(); iter.hasNext();) {
            JSONObject jsonObject = (JSONObject) iter.next();
            list.add(JSONObject.toBean(jsonObject, clazz));
        }
        return list;
    }

    /**
     * 从一个JSON数组得到一个java对象集合，其中对象中包含有集合属性
     * @param object
     * @param clazz
     * @param map 集合属性的类型
     * @return
     */
    public static List getDTOList(String jsonString, Class clazz, Map map) {
        setDateFormat2JAVA();
        JSONArray array = JSONArray.fromObject(jsonString);
        List list = new ArrayList();
        for (Iterator iter = array.iterator(); iter.hasNext();) {
            JSONObject jsonObject = (JSONObject) iter.next();
            list.add(JSONObject.toBean(jsonObject, clazz, map));
        }
        return list;
    }

    /**
     * 从json HASH表达式中获取一个map，该map支持嵌套功能
     * 形如：{"id" : "johncon", "name" : "小强"}
     * 注意commons-collections版本，必须包含org.apache.commons.collections.map.MultiKeyMap
     * @param object
     * @return
     */
    public static Map getMapFromJson(String jsonString) {
        setDateFormat2JAVA();
        JSONObject jsonObject = JSONObject.fromObject(jsonString);
        Map map = new HashMap();
        for (Iterator iter = jsonObject.keys(); iter.hasNext();) {
            String key = (String) iter.next();
            map.put(key, jsonObject.get(key));
        }
        return map;
    }

    /**
     * 从json数组中得到相应java数组
     * json形如：["123", "456"]
     * @param jsonString
     * @return
     */
    public static Object[] getArrayFromJson(String jsonString) {
        JSONArray jsonArray = JSONArray.fromObject(jsonString);
        return jsonArray.toArray();
    }

    /**
     * 把数据对象转换成json字符串
     * DTO对象形如：{"id" : idValue, "name" : nameValue, ...}
     * 数组对象形如：[{}, {}, {}, ...]
     * map对象形如：{key1 : {"id" : idValue, "name" : nameValue, ...}, key2 : {}, ...}
     * @param object
     * @return
     */
    public static String getJSONString(Object object) throws Exception {
        String jsonString = null;
        //日期值处理器
        JsonConfig jsonConfig = new JsonConfig();
        JsonValueProcessor jsonValueProcessor = new JsonDateValueProcessor();
        jsonConfig.registerJsonValueProcessor(java.util.Date.class, jsonValueProcessor);

        if (object != null) {
            if (object instanceof Collection || object instanceof Object[]) {
                jsonString = JSONArray.fromObject(object, jsonConfig).toString();
            } else {
                jsonString = JSONObject.fromObject(object, jsonConfig).toString();
            }
        }
        return jsonString == null ? "{}" : jsonString;
    }

    ////设定日期转换格式
    private static void setDateFormat2JAVA() {
        DateMorpher dmp = new DateMorpher(new String[] { DateStyle.DATE_STYLE.value(),
                DateStyle.FULL_DATE_STYLE.value() });
        JSONUtils.getMorpherRegistry().registerMorpher(dmp);
    }

    /**
     * 使用注册器对指定DynaBean进行对象变换
     */
    public static Object getMorphTargetObject(Class targetClazz, Object srcJsonBeanMorpherObject) {
        MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry();
        Morpher dynaMorpher = new BeanMorpher(targetClazz, morpherRegistry);
        morpherRegistry.registerMorpher(dynaMorpher);
        return morpherRegistry.morph(targetClazz, srcJsonBeanMorpherObject);
    }

}

/*
* json日期值处理器
*/
class JsonDateValueProcessor implements JsonValueProcessor {
    private String format = DateStyle.FULL_DATE_STYLE.value();

    public JsonDateValueProcessor() {
    }

    public Object processArrayValue(Object value, JsonConfig jsonConfig) {
        return process(value, jsonConfig);
    }

    public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {
        return process(value, jsonConfig);
    }

    private Object process(Object value, JsonConfig jsonConfig) {
        if (value instanceof Date) {
            return new SimpleDateFormat(format).format((Date) value);
        }
        return value == null ? null : value.toString();
    }

    public String getFormat() {
        return format;
    }

    public void setFormat(String format) {
        this.format = format;
    }
}