refactor: simplify base64 and getFieldValue method

generator/src/test/java/com/reajason/javaweb/memshell/packer/FreemarkerPackerTest.java

@@ -20,7 +20,6 @@ class FreemarkerPackerTest {
                 .injectorBytesBase64Str("hehe").build();
         String content = new String(packer.pack(generateResult));
         System.out.println(content);
-        assertTrue(content.contains("var className = \"hehe\";"));
         assertTrue(content.contains("var base64Str = \"hehe\";"));
     }
 }

generator/src/test/java/com/reajason/javaweb/memshell/packer/ScriptEnginePackerTest.java

@@ -2,7 +2,12 @@ package com.reajason.javaweb.memshell.packer;
 
 import com.reajason.javaweb.memshell.config.GenerateResult;
 import com.reajason.javaweb.memshell.packer.scriptengine.ScriptEnginePacker;
+import lombok.SneakyThrows;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledOnJre;
+import org.junit.jupiter.api.condition.JRE;
+
+import javax.script.ScriptEngineManager;
 
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -19,8 +24,6 @@ class ScriptEnginePackerTest {
                 .injectorBytesBase64Str("hehe").build();
         String jsContent = new String(new ScriptEnginePacker().pack(generateResult));
         System.out.println(jsContent);
-        assertTrue(jsContent.contains("var className = \"hehe\";"));
         assertTrue(jsContent.contains("var base64Str = \"hehe\";"));
     }
-
 }