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POJO to JSON

A simple plugin for converting POJO to JSON in IntelliJ IDEA

• Support any type you can think of in Java. • Support Java17 and last • Support Java14 Records JEP-359 • Partial support Jackson and Fastjson annotations. • Support conversion • Inner Class • Global Variable • Local Variable • Constructor Parameter • Method Parameter

Support JVM platform languages

• Java - full support • Kotlin - full support

Usage

• Note that the position of the cursor can affect the result! • Open class file > Move cursor to Class/Variable/Parameter > Right click > Copy JSON > JSON result will copy to clipboard

• Open class file > Move cursor to Class/Variable/Parameter > Alt + Insert > Copy JSON > JSON result will copy to clipboard

• Project view select a class file > Right click > Copy JSON > JSON result will copy to clipboard

• Project view select multiple files > Right click > Copy JSON > JSON result will generate to files in the Scratches folder

Installation

• Install in IDEA: • Preferences(Settings) > Plugins > Marketplace > Search"POJO to JSON" > Install

• Manual Install: • [plugin] -> Preferences(Settings) > Plugins > ⚙️ > Install plugin from disk... -> Select the plugin package and install（No need to unzip）

Q&A

• Why always report errors when use it?

This class reference level exceeds maximum limit or has nested references!

When the program throws this warning there are only two possibilities.

• This class or parent class has nested references

eg:

public class A { private B b;

public class B { private A a; } }

{ "b":{ "a":{ "b":{ "a":{ ...... } } } } }

or

public class A { private A a; }

{ "a":{ "a":{ "a":{ "a":{ ...... } } } } }

• This class reference level > 200

eg:

public class A { private B _0;

public class B { private C _1;

public class C { private D _2;

public class D { // _3 ..... _201.. } } } }

{ "_0": { "_1": { "_2": { "......_201":{} } } } }

Perhaps both will happen for entity but this entity are not suitable for JSON.

So you can try to serialize your POJO using Jackson to see what happens.

If no exception, you can submit a bug to this repository issues with your target class :)

• But how to solve this problem?

You can try the following methods.

Support Annotations and Javadoc

• @JsonProperty and @JSONField

import com.alibaba.fastjson.annotation.JSONField; import com.fasterxml.jackson.annotation.JsonProperty;

public class User {

@JsonProperty("name") private String username;

@JSONField(name = "pass") private String password; }

paste result:

{ "name": "", "pass": "" }

• @JsonIgnore or Javadoc tags JsonIgnore

import com.fasterxml.jackson.annotation.JsonIgnore;

public class User {

@JsonIgnore private String username; private String password; }

or when there is no jackson library

public class JsonIgnoreDocTestPOJO {

/** * @JsonIgnore */ private String username; private String password; }

paste result:

{ "password": "" }

• @JsonIgnoreProperties or Javadoc tags JsonIgnoreProperties

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import java.util.List;

public class User {

private String username; @JsonIgnoreProperties({"users", "aaa", "bbb"}) private List<Role> roles;

public class Role {

private String roleName; private List<User> users; } }

or when there is no jackson library

import java.util.List;

public class User {

private String username; /** * @JsonIgnoreProperties users, aaa, bbb */ private List<Role> roles;

public class Role {

private String roleName; private List<User> users; } }

paste result:

{ "username": "", "roles": [ { "roleName": "" } ] }

You may encounter this problem during use.

This class reference level exceeds maximum limit or has nested references!

The above method can solve the nested reference problem well.

• @JsonIgnoreType

import com.fasterxml.jackson.annotation.JsonIgnoreType;

import java.util.List;

public class User {

private String username; private List<Role> roles;

@JsonIgnoreType public class Role { private String roleName; private List<User> users; } }

paste result:

{ "username": "", "roles": [] }

JSON Keys Style Configuration

There are currently two ways to control the JSON keys output style. It can be used at the same time, but with different priorities.

• @JsonNaming (High priority)

import com.fasterxml.jackson.databind.PropertyNamingStrategies; import com.fasterxml.jackson.databind.annotation.JsonNaming; @JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class) class SnakeCaseStrategyTestPOJO { private String firstName; } /* paste result: { "first_name" : "first_name_4123f1bb9e1b" } */

• Global JSON Keys Style Configuration (Low priority)

IntelliJ IDEA > File > Settings > Tools > POJO to JSON > Global JSON keys style

Enter the required expression directly in the input box and apply.

Expressionsrc {"testName":""}

Camel Case(Default)#{#field.getName()} or #{#field.getCamelCaseName()}{"testName":""}

Snake Case#{#field.getSnakeCaseName()}{"test_name":""}

Kebab Case#{#field.getKebabCaseName()}{"test-name":""}

Pascal Case#{#field.getPascalCaseName()}{"TestName":""}

Snake Case Upper#{#field.getSnakeCaseUpperName()}{"TEST_NAME":""}

Lower Case#{#field.getLowerCaseName()}{"testname":""}

Lower Dot Case#{#field.getLowerDotCaseName()}{"test.name":""}

Configure SpEL expression

What can [SpEL expression][spel-url] do?

• Configure meaningful test values. • Field-level control of convert results. • Customize any type you want to convert. • IntelliJ IDEA > File > Settings > Tools > POJO to JSON

Configuration

Default Configuration

• This is a default configuration. Normally no modification.…

Description from the JetBrains Marketplace listing.