将json字符串转换为实体类对象

1.将json字符串转换为实体类对象

public static Object json2Obj(String json) {

try {

com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();

Object entiy = mapper.readValue(json, Object.class);

return entiy;

} catch (com.fasterxml.jackson.core.JsonParseException e) {

e.printStackTrace();

} catch (com.fasterxml.jackson.databind.JsonMappingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

2. 将List对象序列化为JSON文本

public static <T> String toJSONString(List<T> list) {

JSONArray jsonArray = JSONArray.fromObject(list);

return jsonArray.toString();

}

3.将对象序列化为JSON文本

public static String toJSONString(Object object) {

JSONArray jsonArray = JSONArray.fromObject(object);

return jsonArray.toString();

}

...

package com.yn.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.commons.beanutils.BeanUtils;

/**
 * JSON工具类
 * 
 * @author {lzyqssn} <2017年3月17日-上午5:20:00>
 */
public class JsonUtil {

	/**
	 * 将json字符串转换为实体类对象
	 * 
	 * @param json
	 * @return
	 */
	public static Object json2Obj(String json) {
		try {
			com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
			Object entiy = mapper.readValue(json, Object.class);
			return entiy;
		} catch (com.fasterxml.jackson.core.JsonParseException e) {
			e.printStackTrace();
		} catch (com.fasterxml.jackson.databind.JsonMappingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 将List对象序列化为JSON文本
	 */
	public static <T> String toJSONString(List<T> list) {
		JSONArray jsonArray = JSONArray.fromObject(list);

		return jsonArray.toString();
	}

	/**
	 * 将对象序列化为JSON文本
	 * 
	 * @param object
	 * @return
	 */
	public static String toJSONString(Object object) {
		JSONArray jsonArray = JSONArray.fromObject(object);

		return jsonArray.toString();
	}

	/**
	 * 将对象object转换为json字符串.
	 * 
	 * @param object
	 * @return
	 */
	public static String obj2Json(Object object) {
		try {
			com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
			String json = mapper.writeValueAsString(object);
			return json;
		} catch (com.fasterxml.jackson.core.JsonGenerationException e) {
			e.printStackTrace();
		} catch (com.fasterxml.jackson.databind.JsonMappingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 将JSON对象数组序列化为JSON文本
	 * 
	 * @param jsonArray
	 * @return
	 */
	public static String toJSONString(JSONArray jsonArray) {
		return jsonArray.toString();
	}

	/**
	 * 将JSON对象序列化为JSON文本
	 * 
	 * @param jsonObject
	 * @return
	 */
	public static String toJSONString(JSONObject jsonObject) {
		return jsonObject.toString();
	}

	/**
	 * 将对象转换为List对象
	 * 
	 * @param object
	 * @return
	 */
	public static List toArrayList(Object object) {
		List arrayList = new ArrayList();

		JSONArray jsonArray = JSONArray.fromObject(object);

		Iterator it = jsonArray.iterator();
		while (it.hasNext()) {
			JSONObject jsonObject = (JSONObject) it.next();

			Iterator keys = jsonObject.keys();
			while (keys.hasNext()) {
				Object key = keys.next();
				Object value = jsonObject.get(key);
				arrayList.add(value);
			}
		}

		return arrayList;
	}

	/**
	 * 将对象转换为Collection对象
	 * 
	 * @param object
	 * @return
	 */
	public static Collection toCollection(Object object) {
		JSONArray jsonArray = JSONArray.fromObject(object);

		return JSONArray.toCollection(jsonArray);
	}

	/**
	 * 将对象转换为JSON对象数组
	 * 
	 * @param object
	 * @return
	 */
	public static JSONArray toJSONArray(Object object) {
		return JSONArray.fromObject(object);
	}

	/**
	 * 将对象转换为JSON对象
	 * 
	 * @param object
	 * @return
	 */
	public static JSONObject toJSONObject(Object object) {
		return JSONObject.fromObject(object);
	}

	/**
	 * 将对象转换为HashMap
	 * 
	 * @param object
	 * @return
	 */
	public static HashMap toHashMap(Object object) {
		HashMap<String, Object> data = new HashMap<String, Object>();
		JSONObject jsonObject = JsonUtil.toJSONObject(object);
		Iterator it = jsonObject.keys();
		while (it.hasNext()) {
			String key = String.valueOf(it.next());
			Object value = jsonObject.get(key);
			data.put(key, value);
		}

		return data;
	}

	/**
	 * 将对象转换为List>
	 * 
	 * @param object
	 * @return
	 */
	// 返回非实体类型(Map)的List
	public static List<Map<String, Object>> toList(Object object) {
		List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
		JSONArray jsonArray = JSONArray.fromObject(object);
		for (Object obj : jsonArray) {
			JSONObject jsonObject = (JSONObject) obj;
			Map<String, Object> map = new HashMap<String, Object>();
			Iterator it = jsonObject.keys();
			while (it.hasNext()) {
				String key = (String) it.next();
				Object value = jsonObject.get(key);
				map.put((String) key, value);
			}
			list.add(map);
		}
		return list;
	}

	/**
	 * 将JSON对象数组转换为传入类型的List
	 * 
	 * @param
	 * @param jsonArray
	 * @param objectClass
	 * @return
	 */
	public static <T> List<T> toList(JSONArray jsonArray, Class<T> objectClass) {
		return JSONArray.toList(jsonArray, objectClass);
	}

	/**
	 * 将对象转换为传入类型的List
	 * 
	 * @param
	 * @param jsonArray
	 * @param objectClass
	 * @return
	 */
	public static <T> List<T> toList(Object object, Class<T> objectClass) {
		JSONArray jsonArray = JSONArray.fromObject(object);

		return JSONArray.toList(jsonArray, objectClass);
	}

}