build: config spotless plugin

build.gradle

@@ -1,3 +1,9 @@
+buildscript {
+    dependencies {
+        classpath "com.diffplug.spotless:spotless-plugin-gradle:4.5.1"
+    }
+}
+
 plugins {
     id 'java'
     id 'java-library'
@@ -6,6 +12,19 @@ plugins {
     id 'com.github.johnrengelman.shadow' version '4.0.2'
 }
 
+apply plugin: "com.diffplug.gradle.spotless"
+
+spotless {
+    java {
+        removeUnusedImports()
+        eclipse().configFile('shardingsphere_eclipse_formatter.xml')
+        target fileTree('.') {
+            include '**/*.java'
+        }
+    }
+}
+//tasks.compileJava.dependsOn(spotlessJavaApply)
+
 shadowJar {
     classifier = "jar"
     dependencies {
@@ -14,6 +33,7 @@ shadowJar {
 //        relocate 'com.google.code.gson', 'irs.com.google.code.gson'
     }
 }
+
 sourceSets {
     main {
         java {