json工具類：object與json的相互轉換,  listjson的相互轉換

t新增pom.xml的依賴

<dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>3.5</version>
    </dependency>
<dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.2.4</version>
 </dependency>
<dependency>
       <groupId>net.sf.json-lib</groupId>
       <artifactId>json-lib</artifactId>
       <version>2.4</version>
       <classifier>jdk15</classifier>
    </dependency>
 

MyJsonUtil.java

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import com.atguigu.bean.T_MALL_SHOPPINGCAR;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import net.sf.json.JSONArray;

public class MyJsonUtil {



	public static <T> String object_to_json(T t) {
		Gson gson = new Gson();

		String json = gson.toJson(t);

		try {
			json = URLEncoder.encode(json, "utf-8");
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return json;
	}

	public static <T> T json_to_object(String json, Class<T> t) {

		try {
			json = URLDecoder.decode(json, "utf-8");
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		Gson gson = new Gson();

		T fromJson = gson.fromJson(json, t);

		return fromJson;
	}

	public static <T> List<T> json_to_list(String json, Class<T> t) {
		String decode = "";

		if (StringUtils.isBlank(json)) {
			return null;
		} else {
			try {
				decode = URLDecoder.decode(json, "utf-8");
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			JSONArray fromObject2 = JSONArray.fromObject(decode);

			List<T> list_array = (List<T>) JSONArray.toCollection(fromObject2, t);

			return list_array;
		}

	}

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

		Gson gson = new Gson();
		String json = gson.toJson(list);

		try {
			json = URLEncoder.encode(json, "utf-8");
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return json;

	}

}