jackson 复杂对象集合 的几种简单转换

package com;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
 * jackson 复杂 对象集合 的几种简单转换
 * @author lenovo
 *
 * @param <T>
 */
public class Main<T>
{
	static ObjectMapper mapper = new ObjectMapper();

	public static void main(String[] args) throws JsonParseException,
			JsonMappingException, IOException
	{

		String josn = "{\"UserID\":1,\"LoginName\":\"唐工\",\"Truename\":\"超级\",\"Nickname\":null,\"LoginPwd\":\"E10ADC3949BA59ABBE56E057F20F883E\",\"QQ\":\"\",\"Phone\":\"\",\"Email\":null,\"Remark\":\"\",\"Account_Non_Locked\":0,\"Telelephone\":null,\"IsDelete\":0}";
		User u = mapper.readValue(josn, User.class);
		// User u=new Main<User>().jsonStreamConverObject(josn, User.class);
		System.out.println("转对象:" + u);

		// 转集合
		String josn2 = "[{\"UserID\":1,\"LoginName\":\"唐工\",\"Truename\":\"超级\",\"Nickname\":null,\"LoginPwd\":\"E10ADC3949BA59ABBE56E057F20F883E\",\"QQ\":\"\",\"Phone\":\"\",\"Email\":null,\"Remark\":\"\",\"Account_Non_Locked\":0,\"Telelephone\":null,\"IsDelete\":0}]";
		JavaType javaType = mapper.getTypeFactory().constructParametricType(
				List.class, User.class);
		List<User> me = mapper.readValue(josn2, javaType);
		System.out.println("转集合me:" + me);

		// 对象里有 集合 转换
		String josn3 = "{\"UserID\":1,\"LoginName\":\"唐工\",\"Truename\":\"超级\",\"Nickname\":null,\"LoginPwd\":\"E10ADC3949BA59ABBE56E057F20F883E\",\"QQ\":\"\",\"Phone\":\"\",\"Email\":null,\"Remark\":\"\",\"Account_Non_Locked\":0,\"Telelephone\":null,\"IsDelete\":0,\"RoleList\":[{\"Roleid\":0,\"Name\":\"超级管理员\",\"Show_Name\":\"超级管理员\",\"Remark\":null,\"Type\":1}]}";

		User u3 = mapper.readValue(josn3, User.class); // 简单方式
		// User u3=new Main<User>().jsonConverObject(josn3, User.class); 流方式
		System.out.println("转对象里有集合u3:" + u3);

		// 集合 对象 集合 转换
		String josn4 = "[{\"UserID\":1,\"LoginName\":\"唐工\",\"Truename\":\"超级\",\"Nickname\":null,\"LoginPwd\":\"E10ADC3949BA59ABBE56E057F20F883E\",\"QQ\":\"\",\"Phone\":\"\",\"Email\":null,\"Remark\":\"\",\"Account_Non_Locked\":0,\"Telelephone\":null,\"IsDelete\":0,\"RoleList\":[{\"Roleid\":0,\"Name\":\"超级管理员\",\"Show_Name\":\"超级管理员\",\"Remark\":null,\"Type\":1}]},{\"UserID\":2,\"LoginName\":\"唐工\",\"Truename\":\"超级\",\"Nickname\":null,\"LoginPwd\":\"E10ADC3949BA59ABBE56E057F20F883E\",\"QQ\":\"\",\"Phone\":\"\",\"Email\":null,\"Remark\":\"\",\"Account_Non_Locked\":0,\"Telelephone\":null,\"IsDelete\":0,\"RoleList\":[{\"Roleid\":0,\"Name\":\"超级管理员\",\"Show_Name\":\"超级管理员\",\"Remark\":null,\"Type\":1}]}]";
		JavaType javaType4 = mapper.getTypeFactory().constructParametricType(
				List.class, User.class);
		List<User> list = mapper.readValue(josn4, javaType4);
		System.out.println("集合里是对象 对象里有集合转换:" + list);

	}

	/***
	 * 转对象
	 * @param josn
	 * @param clz
	 * @return
	 */
	public T jsonStreamConverObject(String josn, Class<T> clz)
	{

		T t = null;
		// ObjectMapper jacksonMapper = new ObjectMapper();
		InputStreamReader in = new InputStreamReader(new ByteArrayInputStream(
				josn.getBytes()));
		BufferedReader streamReader = new BufferedReader(in);
		StringBuilder buff = new StringBuilder();
		String inputStr;
		try
		{
			while ((inputStr = streamReader.readLine()) != null)
				buff.append(inputStr);
			// ObjectMapper mapper = new ObjectMapper();
			t = mapper.readValue(buff.toString(), clz);

		} catch (IOException e)
		{

			e.printStackTrace();
		}

		return t;
	}

	/***
	 * 转对象
	 * @param josn
	 * @param clz
	 * @return
	 */
	public T jsonConverObject(String josn, Class<T> clz)
	{

		T t = null;
		try
		{
			t = mapper.readValue(josn, clz);
		} catch (JsonParseException e)
		{
			e.printStackTrace();
		} catch (JsonMappingException e)
		{
			e.printStackTrace();
		} catch (IOException e)
		{
			e.printStackTrace();
		}

		return t;
	}

	/**
	 * 转集合
	 * @param josn
	 * @param clz
	 * @return
	 */
	public List<T> jsonConverList(String josn, Class<T> clz)
	{

		List<T> me = null;
		try
		{
			// jacksonMapper
			// .disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);
			// jacksonMapper.enableDefaultTyping();
			// jacksonMapper.setVisibility(JsonMethod.FIELD,JsonAutoDetect.Visibility.ANY);
			// jacksonMapper.configure(SerializationConfig.Feature.INDENT_OUTPUT,
			// false);//格式化
			// jacksonMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
			// jacksonMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS,
			// false);

			JavaType javaType = mapper.getTypeFactory()
					.constructParametricType(List.class, clz);// clz.selGenType().getClass()

			me = mapper.readValue(josn, javaType);
		} catch (JsonParseException e)
		{
			e.printStackTrace();
		} catch (JsonMappingException e)
		{
			e.printStackTrace();
		} catch (IOException e)
		{
			e.printStackTrace();
		}

		return me;
	}
}

/**
 * output:
 * 转对象:User [UserID=1, LoginName=唐工, Truename=超级, Nickname=null, LoginPwd=E10ADC3949BA59ABBE56E057F20F883E, QQ=, Phone=, Email=null, Remark=, Account_Non_Locked=0, Telelephone=null, Indate=null, IsDelete=0, RoleList=null]
 * 转集合me:[User [UserID=1, LoginName=唐工, Truename=超级, Nickname=null, LoginPwd=E10ADC3949BA59ABBE56E057F20F883E, QQ=, Phone=, Email=null, Remark=, Account_Non_Locked=0, Telelephone=null, Indate=null, IsDelete=0, RoleList=null]]
 * 转对象里有集合u3:User [UserID=1, LoginName=唐工, Truename=超级, Nickname=null, LoginPwd=E10ADC3949BA59ABBE56E057F20F883E, QQ=, Phone=, Email=null, Remark=, Account_Non_Locked=0, Telelephone=null, Indate=null, IsDelete=0, RoleList=[Role [Roleid=0, Name=超级管理员, Show_Name=超级管理员, Remark=null, Type=1]]]
 * 集合里是对象 对象里有集合转换:[User [UserID=1, LoginName=唐工, Truename=超级, Nickname=null, LoginPwd=E10ADC3949BA59ABBE56E057F20F883E, QQ=, Phone=, Email=null, Remark=, Account_Non_Locked=0, Telelephone=null, Indate=null, IsDelete=0, RoleList=[Role [Roleid=0, Name=超级管理员, Show_Name=超级管理员, Remark=null, Type=1]]], User [UserID=2, LoginName=唐工, Truename=超级, Nickname=null, LoginPwd=E10ADC3949BA59ABBE56E057F20F883E, QQ=, Phone=, Email=null, Remark=, Account_Non_Locked=0, Telelephone=null, Indate=null, IsDelete=0, RoleList=[Role [Roleid=0, Name=超级管理员, Show_Name=超级管理员, Remark=null, Type=1]]]]

 * */