今天就跟大家聊聊有关使用Java的Jackson库中如何实现转换复杂对象集合，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
话不多说，请看代码：
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]]]]
* */ 看完上述内容，你们对使用Java的Jackson库中如何实现转换复杂对象集合有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注亿速云行业资讯频道，感谢大家的支持。
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