引入GSON

src/gaea.app/build.gradle

@@ -5,6 +5,7 @@ dependencies {
     compile("org.springframework.boot:spring-boot-starter-mail:$spring_version")
     compile group: 'net.sf.dozer', name: 'dozer', version: '5.5.1'
     compile group: 'org.apache.poi', name: 'poi', version: '4.1.2'
+    compile group: 'com.google.code.gson', name: 'gson', version: '2.8.6'
 }
 
 publishing {

src/gaea.app/src/main/kotlin/com/synebula/gaea/app/component/HttpMessage.kt

@@ -1,5 +1,6 @@
 package com.synebula.gaea.app.component
 
+import com.google.gson.Gson
 import com.synebula.gaea.data.message.DataMessage
 
 class HttpMessage() : DataMessage<Any>() {
@@ -22,4 +23,8 @@ class HttpMessage() : DataMessage<Any>() {
         this.message = msg.message
         this.data = msg.data
     }
+
+    override fun toString(): String {
+        return Gson().toJson(this)
+    }
 }