diff --git a/.classpath b/.classpath
deleted file mode 100644
index a004055..0000000
--- a/.classpath
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" output="target/classes" path="src/main/java"/>
-	<classpathentry kind="src" output="target/test-classes" path="src/test/java"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
-	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER"/>
-	<classpathentry kind="output" path="target/classes"/>
-</classpath>
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index b151697..0a3aa2a 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -10,7 +10,7 @@
       </profile>
     </annotationProcessing>
     <bytecodeTargetLevel>
-      <module name="EasyCaptcha" target="1.5" />
+      <module name="EasyCaptcha" target="6" />
     </bytecodeTargetLevel>
   </component>
 </project>
\ No newline at end of file
diff --git a/.project b/.project
deleted file mode 100644
index 1ec0be0..0000000
--- a/.project
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>EasyCaptcha</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.m2e.core.maven2Builder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.m2e.core.maven2Nature</nature>
-	</natures>
-</projectDescription>
diff --git a/.settings/org.eclipse.core.resources.prefs b/.settings/org.eclipse.core.resources.prefs
deleted file mode 100644
index 99f26c0..0000000
--- a/.settings/org.eclipse.core.resources.prefs
+++ /dev/null
@@ -1,2 +0,0 @@
-eclipse.preferences.version=1
-encoding/<project>=UTF-8
diff --git a/.settings/org.eclipse.jdt.core.prefs b/.settings/org.eclipse.jdt.core.prefs
deleted file mode 100644
index 6249222..0000000
--- a/.settings/org.eclipse.jdt.core.prefs
+++ /dev/null
@@ -1,12 +0,0 @@
-eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
-org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.7
-org.eclipse.jdt.core.compiler.debug.lineNumber=generate
-org.eclipse.jdt.core.compiler.debug.localVariable=generate
-org.eclipse.jdt.core.compiler.debug.sourceFile=generate
-org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
-org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
-org.eclipse.jdt.core.compiler.source=1.7
diff --git a/.settings/org.eclipse.m2e.core.prefs b/.settings/org.eclipse.m2e.core.prefs
deleted file mode 100644
index f897a7f..0000000
--- a/.settings/org.eclipse.m2e.core.prefs
+++ /dev/null
@@ -1,4 +0,0 @@
-activeProfiles=
-eclipse.preferences.version=1
-resolveWorkspaceProjects=true
-version=1
diff --git a/EasyCaptcha.iml b/EasyCaptcha.iml
index 889624d..0317dc6 100644
--- a/EasyCaptcha.iml
+++ b/EasyCaptcha.iml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6">
     <output url="file://$MODULE_DIR$/target/classes" />
     <output-test url="file://$MODULE_DIR$/target/test-classes" />
     <content url="file://$MODULE_DIR$">
diff --git a/pom.xml b/pom.xml
index f8a9e1c..660684f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,6 +4,18 @@
 	<groupId>EasyCaptcha</groupId>
 	<artifactId>EasyCaptcha</artifactId>
 	<version>1.1.0-RELEASE</version>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<source>6</source>
+					<target>6</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
 	<name>EasyCaptcha</name>
 
 	<dependencies>
diff --git a/src/main/java/com/wf/captcha/Encoder.java b/src/main/java/com/wf/captcha/Encoder.java
index 6dd15b6..f934d4a 100644
--- a/src/main/java/com/wf/captcha/Encoder.java
+++ b/src/main/java/com/wf/captcha/Encoder.java
@@ -1,4 +1,5 @@
 package com.wf.captcha;
+
 import java.io.IOException;
 import java.io.OutputStream;
 
diff --git a/src/main/java/com/wf/captcha/servlet/CaptchaServlet.java b/src/main/java/com/wf/captcha/servlet/CaptchaServlet.java
index 94a657c..ee5d777 100644
--- a/src/main/java/com/wf/captcha/servlet/CaptchaServlet.java
+++ b/src/main/java/com/wf/captcha/servlet/CaptchaServlet.java
@@ -11,28 +11,28 @@ import com.wf.captcha.utils.CaptchaUtil;
 
 /**
  * 验证码servlet
- * 
+ *
  * @author wangfan
  * @date 2018-5-14 上午9:53:01
  */
 public class CaptchaServlet extends HttpServlet {
-	private static final long serialVersionUID = -90304944339413093L;
+    private static final long serialVersionUID = -90304944339413093L;
 
-	public void doGet(HttpServletRequest request, HttpServletResponse response)
-			throws ServletException, IOException {
-		// 是否有key决定是存在session中还是servletContext中
-		String key = request.getParameter("key");
-		CaptchaUtil cu = new CaptchaUtil();
-		if (key != null && !key.trim().isEmpty()) {
-			cu.out(key, request, response);
-		} else {
-			cu.out(request, response);
-		}
-	}
+    public void doGet(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        // 是否有key决定是存在session中还是servletContext中
+        String key = request.getParameter("key");
+        CaptchaUtil cu = new CaptchaUtil();
+        if (key != null && !key.trim().isEmpty()) {
+            cu.out(key, request, response);
+        } else {
+            cu.out(request, response);
+        }
+    }
 
-	public void doPost(HttpServletRequest request, HttpServletResponse response)
-			throws ServletException, IOException {
-		doGet(request, response);
-	}
+    public void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        doGet(request, response);
+    }
 
 }