Jackson, Gson : class model 일반오류 처리

1.Jackson

Remark : Json 필드 없으면 무시

오류:


com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field

Class 단위로 무시 넣기 .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);
클래스 속성이 잘못되어도 그냥 무시함.


    public static void main(String[] args) throws IOException, LifecycleException {

        //SpringApplication.run(DemoApplication.class, args);
        DemoApplication demo = new DemoApplication();
        JSONObject sJson = demo.TestJsonRead("Testdata.json"); //class

        ObjectMapper objectMapper = new ObjectMapper()
                .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);

        try{
            Sdata sdata = objectMapper.readValue(sJson.toJSONString(),Sdata .class );

            System.out.println(sdata .getFarLst().size());

        } catch (JsonParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JsonMappingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        System.out.println("ok");
    }

public static void main(String[] args) throws IOException, LifecycleException {

//SpringApplication.run(DemoApplication.class, args);

DemoApplication demo = new DemoApplication();

JSONObject sJson = demo.TestJsonRead("Testdata.json"); //class

ObjectMapper objectMapper = new ObjectMapper()

.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);

try{

Sdata sdata = objectMapper.readValue(sJson.toJSONString(),Sdata .class );

System.out.println(sdata .getFarLst().size());

} catch (JsonParseException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (JsonMappingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println("ok");

}

ObjectMapper 에 무시 넣기 @JsonIgnoreProperties(ignoreUnknown = true)


@JsonProperty("gkTrgtYn")
    @JsonIgnoreProperties(ignoreUnknown = true)
    public String getGkTrgtYn() {
        return this.gkTrgtYn; }
    public void setGkTrgtYn(String gkTrgtYn) {
        this.gkTrgtYn = gkTrgtYn; }
    String gkTrgtYn;

@JsonProperty("gkTrgtYn")

@JsonIgnoreProperties(ignoreUnknown = true)

public String getGkTrgtYn() {

return this.gkTrgtYn; }

public void setGkTrgtYn(String gkTrgtYn) {

this.gkTrgtYn = gkTrgtYn; }

String gkTrgtYn;

2.Gson

Remark : Json 필드가 없으면 자동 무시 하나. 클래스 속성이 잘못되면 에러


Caused by: com.google.gson.JsonSyntaxException: java.lang.NumberFormatException: Expected an int but was 2.7 at line 1 column 1478620 path $.Lst&#91;165].cardPromLst&#91;0].Rate

Caused by: com.google.gson.JsonSyntaxException: java.lang.NumberFormatException: Expected an int but was 2.7 at line 1 column 1478620 path $.Lst[165].cardPromLst[0].Rate

모델 클래스 속성 int


@JsonProperty("Rate")
    public int getRate() {
        return this.totRate; }
    public void setRate(int Rate) {
        this.Rate = Rate; }

int Rate;

@JsonProperty("Rate")

public int getRate() {

return this.totRate; }

public void setRate(int Rate) {

this.Rate = Rate; }

int Rate;

수정 String


@JsonProperty("Rate")
    public String getRate() {
        return this.totRate; }
    public void setRate(String Rate) {
        this.Rate = Rate; }

String Rate;

@JsonProperty("Rate")

public String getRate() {

return this.totRate; }

public void setRate(String Rate) {

this.Rate = Rate; }

String Rate;

Class 단위로 무시는 자동처리, 없으면 null 으로 대체 옵션: serializeNulls()


package com.example.demo;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

import org.apache.catalina.LifecycleException;

import org.json.simple.JSONObject;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.io.*;
import java.net.HttpURLConnection;

import java.net.URL;

import service.SimpleRead;

import vo.ScheAirFarRs.ScheAirFarRsVo;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) throws IOException, LifecycleException {

        //SpringApplication.run(DemoApplication.class, args);
        DemoApplication demo = new DemoApplication();

        JSONObject sJson = demo.TestJsonRead("Testjson.json");  // 함수

        GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.serializeNulls(); //없음면  null로 대체
        Gson gson = gsonBuilder.create();

        try {

            Sdata sdata =gson.fromJson(sJson.toJSONString(), Sdata .class);

            System.out.println(sdata.getFarLst().size());

            } catch (Exception e) {

                throw new RuntimeException("Unexpected error during parsing body param.", e);
            }

        System.out.println("ok");
    }

public JSONObject TestJsonRead(String FileName)
    {
        SimpleRead simpleRead = new SimpleRead();

        JSONObject sResult;

        sResult = simpleRead.ReadJson(FileName);

       // System.out.println(sResult.toJSONString());
        return sResult;
    }
}

package com.example.demo;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.google.gson.Gson;

import com.google.gson.GsonBuilder;

import com.google.gson.JsonElement;

import com.google.gson.JsonParser;

import org.apache.catalina.LifecycleException;

import org.json.simple.JSONObject;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.io.*;

import java.net.HttpURLConnection;

import java.net.URL;

import service.SimpleRead;

import vo.ScheAirFarRs.ScheAirFarRsVo;

@SpringBootApplication

public class DemoApplication {

public static void main(String[] args) throws IOException, LifecycleException {

//SpringApplication.run(DemoApplication.class, args);

DemoApplication demo = new DemoApplication();

JSONObject sJson = demo.TestJsonRead("Testjson.json"); // 함수

GsonBuilder gsonBuilder = new GsonBuilder();

gsonBuilder.serializeNulls(); //없음면 null로 대체

Gson gson = gsonBuilder.create();

try {

Sdata sdata =gson.fromJson(sJson.toJSONString(), Sdata .class);

System.out.println(sdata.getFarLst().size());

} catch (Exception e) {

throw new RuntimeException("Unexpected error during parsing body param.", e);

}

System.out.println("ok");

}

public JSONObject TestJsonRead(String FileName)

{

SimpleRead simpleRead = new SimpleRead();

JSONObject sResult;

sResult = simpleRead.ReadJson(FileName);

// System.out.println(sResult.toJSONString());

return sResult;

}


package service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

@Controller
public class SimpleRead {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());
    @GetMapping("ReadJson")
    public JSONObject ReadJson(String Filename) { //ReadJson

        String RetVal = "";

        JSONObject jsonObject = new JSONObject();

        try {
            JSONParser parser = new JSONParser();
            try(BufferedReader br = new BufferedReader(new FileReader(Filename)))
            {
                String line;
                while ((line = br.readLine()) != null) {
                    RetVal = RetVal + line;
                    //System.out.println(line);
                }
            }

            jsonObject = (JSONObject) parser.parse(RetVal);

        } catch (ParseException | IOException e) {
            logger.debug(e.toString());
            throw new RuntimeException(e);
        }
        return jsonObject;
    }
}

package service;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.json.simple.JSONObject;

import org.json.simple.parser.JSONParser;

import org.json.simple.parser.ParseException;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

@Controller

public class SimpleRead {

private final Logger logger = LoggerFactory.getLogger(this.getClass());

@GetMapping("ReadJson")

public JSONObject ReadJson(String Filename) { //ReadJson

String RetVal = "";

JSONObject jsonObject = new JSONObject();

try {

JSONParser parser = new JSONParser();

try(BufferedReader br = new BufferedReader(new FileReader(Filename)))

{

String line;

while ((line = br.readLine()) != null) {

RetVal = RetVal + line;

//System.out.println(line);

}

jsonObject = (JSONObject) parser.parse(RetVal);

} catch (ParseException | IOException e) {

logger.debug(e.toString());

throw new RuntimeException(e);

}

return jsonObject;

}

1.Jackson

Remark : Json 필드 없으면 무시

오류:

Class 단위로 무시 넣기 .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);클래스 속성이 잘못되어도 그냥 무시함.

ObjectMapper 에 무시 넣기 @JsonIgnoreProperties(ignoreUnknown = true)

2.Gson

Remark : Json 필드가 없으면 자동 무시 하나. 클래스 속성이 잘못되면 에러

모델 클래스 속성 int

수정 String

Class 단위로 무시는 자동처리, 없으면 null 으로 대체 옵션: serializeNulls()

Class 단위로 무시 넣기 .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);
클래스 속성이 잘못되어도 그냥 무시함.