如何在不创建对象的情况下将Java类转换为json格式结构 [英] How to convert java class to json format structure without creating object

问题描述

我需要记录多个微服务api调用，所以我有一个问题，如何直接从java pojo类中创建json字符串.我的意思是说，

I need to document multiple microservices api call,so I have a question that how to create json string out of java pojo class directly. I mean say for example ,

MyPojo.java

MyPojo.java

public class MyPojo {
String name;
List<String> address;
public MyPojo() {
    // TODO Auto-generated constructor stub
}
//setters and getters

}

现在我需要pojo的字符串json结构而不创建类的对象.可能与swagger api在Web UI中创建@RequestBody对象的json结构的方式相同.

now I need the string json structure of the pojo without creating object of the class.May be same the way swagger api creates json structure of @RequestBody object in web UI.

类似:

String jsonStruct=SomeUtil.convertPojoToJson(MyPojo.class)

然后它应该像:

{"name":"string","address":[]}

我的尝试:

import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import io.swagger.v3.core.converter.ModelConverters;
import io.swagger.v3.core.util.Json;
import io.swagger.v3.oas.models.media.Schema;

public class TEst {
public static void main(String[] args) throws JsonProcessingException {

    ObjectMapper obj = new ObjectMapper(); 

    MyPojo o=new MyPojo();
    o.setName("aa");
    List<String> l=Arrays.asList("a","s");
    o.setAddress(l);
    System.out.println(obj.writeValueAsString(o));

}
}

实际o/p:

 {"name":"aa","address":["a","s"]}

必需的o/p:

 {"name":"string","address":["string"]}

注意:但是我需要创建而不创建对象，因为实际上pojo是巨大的，不可能设置所有虚拟数据.

CONCERN: But I need to create without creating object as in real the pojo is huge and not possible to set all dummy data.

推荐答案

您可以使用 Podam

PODAM是一种轻量级的工具，可以用数据自动填充Java POJO.这 在进行单元测试时非常方便.多亏了PODAM，用户现在有了 一线完成所有工作.

PODAM is a lightweight tool to auto-fill Java POJOs with data. This comes handy when developing unit tests. Thanks to PODAM users now have a one-liner that does all the work them.

在您的项目中添加PODAM依赖项

Add PODAM dependency in your project

<dependency>
  <groupId>uk.co.jemos.podam</groupId>
  <artifactId>podam</artifactId>
  <version>[latest.version]</version>
  <!-- <scope>test</scope> -->
</dependency>

• 如果您不想使用默认值(随机数据)，请定义DataProviderStrategy
• 定义PodamFactory bean，使用数据提供者策略
初始化
• 在代码中使用PodamFactory bean
• Define your DataProviderStrategy if you don't want the default (Random data)
• Define PodamFactory bean, initialized with the Data Provider Strategy
• Use the PodamFactory bean in your code

 PodamFactory factory = new PodamFactoryImpl();
 MyPojo myPojo = factory.manufacturePojo(MyPojo .class);
 // write it as json
 System.out.println(new ObjectMapper().writeValueAsString(myPojo));

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