remove unused imports

Author: binarywang

weixin-java-common/src/main/java/me/chanjar/weixin/common/util/crypto/SHA1.java

@@ -1,11 +1,10 @@
 package me.chanjar.weixin.common.util.crypto;
 
-import org.apache.commons.codec.digest.DigestUtils;
-
-import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.Arrays;
 
+import org.apache.commons.codec.digest.DigestUtils;
+
 /**
  * Created by Daniel Qian on 14/10/19.
  */

weixin-java-common/src/main/java/me/chanjar/weixin/common/util/http/RequestExecutor.java

@@ -5,7 +5,6 @@
 import org.apache.http.HttpHost;
 import org.apache.http.client.ClientProtocolException;
 import org.apache.http.impl.client.CloseableHttpClient;
-import org.apache.http.impl.client.HttpClients;
 
 import me.chanjar.weixin.common.exception.WxErrorException;
 

weixin-java-common/src/main/java/me/chanjar/weixin/common/util/xml/XStreamInitializer.java

@@ -1,19 +1,15 @@
 package me.chanjar.weixin.common.util.xml;
 
+import java.io.Writer;
+
 import com.thoughtworks.xstream.XStream;
-import com.thoughtworks.xstream.converters.basic.DoubleConverter;
-import com.thoughtworks.xstream.converters.basic.FloatConverter;
-import com.thoughtworks.xstream.converters.basic.IntConverter;
 import com.thoughtworks.xstream.core.util.QuickWriter;
 import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
 import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
 import com.thoughtworks.xstream.io.xml.XppDriver;
-import com.thoughtworks.xstream.security.NoTypePermission;
 import com.thoughtworks.xstream.security.NullPermission;
 import com.thoughtworks.xstream.security.PrimitiveTypePermission;
 
-import java.io.Writer;
-
 public class XStreamInitializer {
 
   public static XStream getInstance() {