Object与json数据相互转换-蒲公英云

Object与json数据相互转换

Object**与**json数据相互转换

wangxl@20180717

最近在测试nb终端与iot平台数据对接，经常用到object与json数据转换，参考华为提供的列程,整理以下两个函数,方便自己以后查阅也提供给大家学习参考;

Object转成json字符串

import com.fasterxml.jackson.databind.ObjectMapper;

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

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

public void Object2JsonStr()

{

//组装body体

ObjectMapper mapper = new ObjectMapper();

ObjectNode root = mapper.createObjectNode();

root.put(“msgType”, “1”);

//组装消息体

root.put(“hasMore”, “0”);

ArrayNode arrynode = mapper.createArrayNode();

//组装数据

ObjectNode Node = mapper.createObjectNode();

Node.put(“serviceId”, “StreetLight”);

ObjectNode reqData = mapper.createObjectNode();

reqData.put(“length”, 12);

reqData.put(“value”, “123456789012”);

Node.put(“serviceData”, reqData);

arrynode.add(Node);

root.put(“data”, arrynode);

String str = root.toString();

System.out.println(str);

}

//打印输出字符串：

{“msgType”:”1”,”hasMore”:”0”,”data”:[{“serviceId”:”StreetLight”,”serviceData”:{“length”:12,”value”:”123456789012”}}]}

json字符串转找成Object

1、利用json在线生成实体类,json在线网址：https://www.sojson.com/json2entity.html

//package ;

public class ServiceData

{

private int length;
private String value;
public void setLength(int length)\{
    this.length = length;
\}
public int getLength()\{
    return this.length;
\}
public void setValue(String value)\{
    this.value = value;
\}
public String getValue()\{
    return this.value;
\}

}

//==================================

//package ;

public class Data

{

private String serviceId;
private ServiceData serviceData;
public void setServiceId(String serviceId)\{
    this.serviceId = serviceId;
\}
public String getServiceId()\{
    return this.serviceId;
\}
public void setServiceData(ServiceData serviceData)\{
    this.serviceData = serviceData;
\}
public ServiceData getServiceData()\{
    return this.serviceData;
\}

}

//==================================

//package ;

import java.util.ArrayList;

import java.util.List;

public class DataRoot

{

private String msgType;
private String hasMore;
private List<Data> data;
public void setMsgType(String msgType)\{
    this.msgType = msgType;
\}
public String getMsgType()\{
    return this.msgType;
\}
public void setHasMore(String hasMore)\{
    this.hasMore = hasMore;
\}
public String getHasMore()\{
    return this.hasMore;
\}
public void setData(List<Data> data)\{
    this.data = data;
\}
public List<Data> getData()\{
    return this.data;
\}

}

2、json字符串转找成Object

public void JsonStr2Object()

{

String jsonstr=”{\“msgType\“:\“1\“,\“hasMore\“:\“0\“,\“data\“:[{\“serviceId\“:\“StreetLight\“,\“serviceData\“:{\“length\“:12,\“value\“:\“123456789012\“}}]}“;

ObjectMapper mapper = new ObjectMapper();

try {

     mapper.configure(SerializationFeature.***FAIL\_ON\_EMPTY\_BEANS***, **false**);

// 忽略不需要的字段

mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

     DataRoot dataroot = mapper.readValue(jsonstr, DataRoot.**class**);
     String msgtype = dataroot.getMsgType();
        System.***out***.println("msgtype="+msgtype);
        List<Data> datas = dataroot.getData();
        **if**(datas.size()>0)
        \{
         Data data = datas.get(0);
         ServiceData serdata=data.getServiceData();
         String value=serdata.getValue();
         System.***out***.println("value="+value);
        \}
\}
**catch** (Exception e)
\{
    e.printStackTrace();
\}