最近工作中用到的jackjson中的一些简单使用，整理了以下示例，便于以后学习使用。

package com.sgai.test;

import java.io.Reader;

import java.io.StringReader;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

import com.fasterxml.jackson.annotation.JsonAutoDetect;

import com.fasterxml.jackson.annotation.JsonInclude.Include;

import com.fasterxml.jackson.databind.DeserializationFeature;

import com.fasterxml.jackson.databind.JsonNode;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.fasterxml.jackson.databind.node.ArrayNode;

import com.fasterxml.jackson.databind.node.ObjectNode;

import cn.hutool.json.JSONObject;

//json学习链接https://blog.csdn.net/lin443514407lin/article/details/85262479

@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY,getterVisibility = JsonAutoDetect.Visibility.NONE)

public class TestSYJson {

  public static JSONObject toLowerKey(Map jso) {

        Map resultMap = new HashMap ();

        Set<String> sets = jso.keySet();

        for (String key : sets) {

            resultMap.put(key.toLowerCase(), jso.get(key));

        }

        JSONObject jr=new JSONObject(resultMap);

        return  jr;

    }

  public static void main(String[] args) throws Exception {

    //对象

    Map m=new HashMap();

m.put("OrderDetail", "rrrrr");

m.put("NameG", "wwww");

m.put("AgeG", "8888");

//把对象转化成json字符串

ObjectMapper objectMapper = new ObjectMapper().disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES).setSerializationInclusion(Include.NON_NULL);

String tt=objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(m);

System.out.println("把对象转化成json字符串"+tt);

//把json字符串 转化成 javabean

Reader reader = new StringReader(tt);

Map rm = objectMapper.readValue(reader, Map.class);

rm= toLowerKey(rm);//转小写的方式

System.out.println("把字符串转化成json对象"+rm.get("OrderDetail"));

//把json字符串 转化成 json对象

JsonNode jj=objectMapper.readTree(tt);

//判断某个节点是否是array

if( jj.get("AgeG").isArray()){

//如果是array，则转化成Iterator

Iterator it=  jj.get("AgeG").iterator();

}

//删除json对象中的某个节点使用ObjectNode，可以增加删除Node

ObjectNode oo=(ObjectNode)objectMapper.readTree(tt);

//删除

oo.remove( "chargedetails");

//增加普通节点

oo.put("ttt", "waoo");

//添加普通数组节

ArrayNode an=oo.putArray("treeList");

String [] treess={"apple","charry"};

for(String tree:treess){

an.add(tree);

}

System.out.println(oo);

//添加json数组节点

ArrayNode an2=oo.putArray("jsonList");

String [] treess2={"apple#read","charry#blue"};

for(String tree:treess2){

String [] tmp  =tree.split("#");

Map ttm=new HashMap();

ttm.put("name", tmp[0]);

ttm.put("colour",  tmp[1]);

String tmpJ=objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(ttm);

    JsonNode tmpN=objectMapper.readTree(tmpJ);

an2.add(tmpN);

}

System.out.println(oo);

}

}