解决

下载源码到idea：

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修改以下两处：

1、gradle-wrapper.properties

版本改为自己电脑上的即可：

distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip

2、build.gradle

版本改为自己电脑上的即可：

1、org.jetbrains.intellij 版本为：创建gradle项目后可查看：

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2、intellij.version 可通过idea 关于查看：

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注意：

intellij标签中键值对 key=value
plugins为数组

最终文件内容如下：

buildscript {
    repositories {
        mavenCentral()
        maven {
            url "https://oss.sonatype.org/content/repositories/snapshots/"
        }
        maven {
            url 'https://dl.bintray.com/jetbrains/intellij-plugin-service'
        }
    }
}
plugins {
    id 'org.jetbrains.intellij' version '1.1.4'
}

apply plugin: 'org.jetbrains.intellij'
apply plugin: 'java'
// dependencies {
//     compile project(':ThirdPart:checktreetable')
//     compile project(':ThirdPart:json')
// }
sourceSets {
    main {
        java {
            srcDir "${project.rootDir.absolutePath}/ThirdParty/json/java/src"
            srcDir "${project.rootDir.absolutePath}/ThirdParty/treetable/java/src"
        }

    }
}

//IntelliJ IDEA 2021.2 (Community Edition)
//Build #IC-212.4746.92, built on July 27, 2021
//Runtime version: 11.0.11+9-b1504.13 x86_64
//VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
//macOS 11.1
//GC: G1 Young Generation, G1 Old Generation
//Memory: 1024M
//Cores: 8
//Non-Bundled Plugins: GsonFormatPlus (1.6.1), com.godwin.json.parser (1.4.2), cn.yiiguxing.plugin.translate (2.9.2)
//Kotlin: 212-1.5.10-release-IJ4746.92

intellij {
    plugins = ['java']
    version = 'IC-212.4746.92'
    pluginName = 'GsonFormat'
    updateSinceUntilBuild = false

//    publish {
//        pluginId '7910'
//        username publishUsername
//        password publishPassword
//    }

//     Uncomment to test against Android Studio
//     intellij.alternativeIdePath = '/Applications/Android Studio.app'
}

repositories {
    mavenCentral()
    maven {
        url "https://oss.sonatype.org/content/repositories/snapshots/"
    }
    maven {
        url 'https://dl.bintray.com/jetbrains/intellij-plugin-service'
    }
    maven { url "https://www.jetbrains.com/intellij-repository/releases" }
    maven { url "https://www.jetbrains.com/intellij-repository/snapshots" }
}