本文主要介绍了java的jackson库中复杂对象集合的几种简单转换。具有很好的参考价值，下面跟着小编一起来看下吧
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]]]]
* */
更多java的jackson库中复杂对象集合的几种简单转换。