POJO

POJO:AckDoc

package org.example.pojo;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonRootName;
@JsonRootName(value="ackDoc")
public class AckDoc {
    /**
     * 返回头
     */
    private  AckDocHeader docHeader;
    /**
     * 返回内容
     */
    private Object docRecord;
    public  AckDocHeader getDocHeader() {
        return docHeader;
    }
    public void setDocHeader( AckDocHeader docHeader) {
        this.docHeader = docHeader;
    }
    public Object getDocRecord() {
        return docRecord;
    }
    public void setDocRecord(Object docRecord) {
        this.docRecord = docRecord;
    }
    public AckDoc( AckDocHeader docHeader, Object docRecord) {
        this.docHeader = docHeader;
        this.docRecord = docRecord;
    }
    public AckDoc( AckDocHeader docHeader) {
        this.docHeader = docHeader;
    }
    public AckDoc() {
    }
    @Override
    public String toString() {
        return "{" +
                "docHeader=" + docHeader +
                ", docRecord=" + docRecord +
                '}';
    }
}

POJO:AckDocHeader

package org.example.pojo;
import com.fasterxml.jackson.annotation.JsonProperty;
public class AckDocHeader
{
    /**
     * 会话id
     */
    private String sessionId;
    /**
     * 编码
     */
    private String ackCode;
    /**
     * 内容
     */
    private String ackMsg;
    public String getSessionId() {
        return sessionId;
    }
    public void setSessionId(String sessionId) {
        this.sessionId = sessionId;
    }
    public String getAckCode() {
        return ackCode;
    }
    public void setAckCode(String ackCode) {
        this.ackCode = ackCode;
    }
    public String getAckMsg() {
        return ackMsg;
    }
    public void setAckMsg(String ackMsg) {
        this.ackMsg = ackMsg;
    }
    public AckDocHeader() {
    }
    public AckDocHeader(String sessionId, String ackCode, String ackMsg) {
        this.sessionId = sessionId;
        this.ackCode = ackCode;
        this.ackMsg = ackMsg;
    }
    public AckDocHeader(String ackCode, String ackMsg) {
        this.ackCode = ackCode;
        this.ackMsg = ackMsg;
    }
    @Override
    public String toString() {
        return "AckDocHeader{" +
                "sessionId='" + sessionId + '\'' +
                ", ackCode='" + ackCode + '\'' +
                ", ackMsg='" + ackMsg + '\'' +
                '}';
    }
}

POJO:DemoTestListPojo

package org.example.pojo;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonRootName;
import java.util.List;

@JsonRootName(value="bigPojo")
public class DemoTestListPojo {
    private List<DemoTestPojo> demoTestPojoList;
    private  String   cmt ;
    public List<DemoTestPojo> getDemoTestPojoList() {
        return demoTestPojoList;
    }
    public void setDemoTestPojoList(List<DemoTestPojo> demoTestPojoList) {
        this.demoTestPojoList = demoTestPojoList;
    }
    public String getCmt() {
        return cmt;
    }
    public void setCmt(String cmt) {
        this.cmt = cmt;
    }
    @Override
    public String toString() {
        return "DemoTestListPojo{" +
                "demoTestPojoList=" + demoTestPojoList +
                ", cmt='" + cmt + '\'' +
                '}';
    }
}

POJO:DemoTestPojo

package org.example.pojo;
import com.fasterxml.jackson.annotation.JsonProperty;
public class DemoTestPojo  {
    private String name;
    private String des;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getDes() {
        return des;
    }
    public void setDes(String des) {
        this.des = des;
    }
    @Override
    public String toString() {
        return "DemoTestPojo{" +
                "name='" + name + '\'' +
                ", des='" + des + '\'' +
                '}';
    }
}

FastJson

package org.example;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.example.pojo.AckDoc;
import org.example.pojo.AckDocHeader;
import org.example.pojo.DemoTestListPojo;
import org.example.pojo.DemoTestPojo;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
 class AppFast
{
    public static void main( String[] args ) throws Exception {
        List<DemoTestPojo> lst = new ArrayList<DemoTestPojo>();
        for(int i=0 ; i<3 ; i++)
        {
            DemoTestPojo dt = new DemoTestPojo();
            dt.setName("name" + i);
            dt.setDes("des");
            lst.add(dt);
        }
        DemoTestListPojo dtlp = new DemoTestListPojo();
        dtlp.setDemoTestPojoList(lst);
        dtlp.setCmt("wwww");
        AckDocHeader ah = new AckDocHeader("sessionid-1","0","msg-empty");
        AckDoc ack = new AckDoc(ah,dtlp);

        // AckDoc  to  json    fastjson
        String json = JSON.toJSONString(ack);
        System.out.println("json = " +json);

        // json  to  AckDoc   fastjson
        // 两种json转对象的方式效果一样。
        // 第一种
        //JSONObject jsonObject1 = JSONObject.parseObject(json);
        //AckDoc ackDoc1 = jsonObject1.toJavaObject(AckDoc.class);
        //System.out.println("ackDoc1 = " +ackDoc1);
       // 第二种
        AckDoc ackDoc = JSON.parseObject(json,AckDoc.class);
        System.out.println("AckDoc = " +ackDoc);
       
        JSONObject  jsonObject = (JSONObject)ackDoc.getDocRecord();
        DemoTestListPojo demoTestListPojo = jsonObject.toJavaObject(DemoTestListPojo.class);
        List<DemoTestPojo> pojoList = demoTestListPojo.getDemoTestPojoList();
        System.out.println("pojoList = " +pojoList);
        String cmt = demoTestListPojo.getCmt();
        System.out.println("cmt = " +cmt);
    }
}

JackJson

package org.example;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.support.hsf.HSFJSONUtils;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.*;
import org.example.pojo.AckDoc;
import org.example.pojo.AckDocHeader;
import org.example.pojo.DemoTestListPojo;
import org.example.pojo.DemoTestPojo;

import java.io.IOException;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;

/**
 * Hello world!
 *
 */
public class AppJack
{
    public static void main( String[] args ) throws Exception {
        List<DemoTestPojo> lst = new ArrayList<DemoTestPojo>();
        for(int i=0 ; i<3 ; i++)
        {
            DemoTestPojo dt = new DemoTestPojo();
            dt.setName("name" + i);
            dt.setDes("des");
            lst.add(dt);
        }
        DemoTestListPojo dtlp = new DemoTestListPojo();
        dtlp.setDemoTestPojoList(lst);
        dtlp.setCmt("wwww");
        AckDocHeader ah = new AckDocHeader("sessionid-1","0","msg-empty");
        AckDoc ack = new AckDoc(ah,dtlp);
        // AckDoc  to  json    jackjson
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(ack);
        System.out.println("json = " +json);
        // json  to  AckDoc  jackjson
        AckDoc ackDoc = (AckDoc) mapper.readValue(json, AckDoc.class);
        System.out.println("AckDoc = " +ackDoc);
        LinkedHashMap linkedHashMap = (LinkedHashMap)ackDoc.getDocRecord();
        List<DemoTestPojo> pojoList = (List<DemoTestPojo>) linkedHashMap.get("demoTestPojoList");
        System.out.println("pojoList = " +pojoList);
        String cmt = (String) linkedHashMap.get("cmt");
        System.out.println("cmt = " +cmt);
       /* JsonNode jsonNode = mapper.readTree(json);
        JsonNode doc_record = jsonNode.path("DOC_RECORD");
        JsonNode demo_test = doc_record.path("DEMO_TEST");
        String subJson = demo_test.toString();
        List<DemoTestPojo> pojo = mapper.readValue(subJson, new TypeReference<List<DemoTestPojo>>() {});
        System.out.println("pojo = " +pojo);*/
    }
}

特殊

package org.example;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.example.pojo.AckDoc;
import org.example.pojo.AckDocHeader;
import org.example.pojo.DemoTestListPojo;
import org.example.pojo.DemoTestPojo;

import java.util.ArrayList;
import java.util.List;

/**
 * Hello world!
 *
 */
public class App
{
    public static void main( String[] args ) throws Exception {
        List<DemoTestPojo> lst = new ArrayList<DemoTestPojo>();
        for(int i=0 ; i<3 ; i++)
        {
            DemoTestPojo dt = new DemoTestPojo();
            dt.setName("name" + i);
            dt.setDes("des");
            lst.add(dt);
        }
        ObjectMapper mapper = new ObjectMapper();
        mapper.enable(SerializationFeature.WRAP_ROOT_VALUE);
        DemoTestListPojo dtlp = new DemoTestListPojo();
        dtlp.setDemoTestPojoList(lst);
        dtlp.setCmt("wwww");
        JsonNode rootNode = mapper.readTree(mapper.writeValueAsString(dtlp));
        AckDocHeader ah = new AckDocHeader("sessionid-1","0","msg-empty");
        AckDoc ack = new AckDoc(ah,rootNode);

        // AckDoc  to  json     jackjson
        String json = mapper.writeValueAsString(ack);
        System.out.println("json = " +json);

        // json  to  AckDoc      fastjson  添加了外层pojo,不能直接对象转json
        AckDoc ackDoc = JSON.parseObject(json,AckDoc.class);
        System.out.println("AckDoc = " +ackDoc);
        JSONObject  jsonObject = (JSONObject)ackDoc.getDocRecord();
        DemoTestListPojo demoTestListPojo = jsonObject.toJavaObject(DemoTestListPojo.class);
        List<DemoTestPojo> pojoList = demoTestListPojo.getDemoTestPojoList();
        System.out.println("pojoList = " +pojoList);
        String cmt = demoTestListPojo.getCmt();
        System.out.println("cmt = " +cmt);
    }
}