diff --git a/contact-center/app/src/main/java/com/chatopera/cc/controller/resource/MediaController.java b/contact-center/app/src/main/java/com/chatopera/cc/controller/resource/MediaController.java
index 024b2027..71b4c25c 100644
--- a/contact-center/app/src/main/java/com/chatopera/cc/controller/resource/MediaController.java
+++ b/contact-center/app/src/main/java/com/chatopera/cc/controller/resource/MediaController.java
@@ -25,13 +25,14 @@ import com.chatopera.cc.persistence.blob.JpaBlobHelper;
 import com.chatopera.cc.persistence.repository.AttachmentRepository;
 import com.chatopera.cc.persistence.repository.StreamingFileRepository;
 import com.chatopera.cc.util.Menu;
+import lombok.RequiredArgsConstructor;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.tomcat.util.http.fileupload.IOUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.lang.NonNull;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.ModelMap;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -48,34 +49,32 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.URL;
 import java.sql.SQLException;
+import java.util.Optional;
 
 @Controller
 @RequestMapping("/res")
+@RequiredArgsConstructor
 public class MediaController extends Handler {
     private final static Logger logger = LoggerFactory.getLogger(MediaController.class);
-
+    private static final String TEMPLATE_DATA_PATH = "WEB-INF/data/templates/";
+    @NonNull
+    private final StreamingFileRepository streamingFileRes;
+    @NonNull
+    private final JpaBlobHelper jpaBlobHelper;
+    @NonNull
+    private final AttachmentRepository attachementRes;
     @Value("${web.upload-path}")
     private String path;
 
-    @Autowired
-    private StreamingFileRepository streamingFileRes;
-
-    @Autowired
-    private JpaBlobHelper jpaBlobHelper;
-
-    private final String TEMPLATE_DATA_PATH = "WEB-INF/data/templates/";
-
-    @Autowired
-    private AttachmentRepository attachementRes;
-
     @RequestMapping("/image")
     @Menu(type = "resouce", subtype = "image", access = true)
     public void index(HttpServletResponse response,
                       @Valid String id,
                       @RequestParam(value = "original", required = false) boolean original,
                       @RequestParam(value = "cooperation", required = false) boolean cooperation) throws IOException, SQLException {
-        StreamingFile sf = streamingFileRes.findOne(id);
-        if (sf != null) {
+        Optional<StreamingFile> optional = streamingFileRes.findById(id);
+        if (optional.isPresent()) {
+            StreamingFile sf = optional.get();
             response.setHeader("Content-Type", sf.getMime());
             response.setContentType(sf.getMime());
             if (cooperation && (sf.getCooperation() != null)) { // 协作文件
@@ -105,7 +104,7 @@ public class MediaController extends Handler {
     @Menu(type = "resouce", subtype = "image", access = true)
     public void url(HttpServletResponse response, @Valid String url) throws IOException {
         byte[] data = new byte[1024];
-        int length = 0;
+        int length;
         OutputStream out = response.getOutputStream();
         if (StringUtils.isNotBlank(url)) {
             InputStream input = new URL(url).openStream();
@@ -119,13 +118,13 @@ public class MediaController extends Handler {
     @RequestMapping("/image/upload")
     @Menu(type = "resouce", subtype = "imageupload")
     public ModelAndView upload(ModelMap map,
-                               HttpServletRequest request,
                                @RequestParam(value = "imgFile", required = false) MultipartFile multipart) throws IOException {
         ModelAndView view = request(super.createRequestPageTempletResponse("/public/upload"));
-        UploadStatus notify = null;
-        if (multipart != null && multipart.getOriginalFilename().lastIndexOf(".") > 0) {
+        UploadStatus notify;
+        if (multipart != null && multipart.getOriginalFilename() != null && multipart.getOriginalFilename().lastIndexOf(".") > 0) {
             File uploadDir = new File(path, "upload");
             if (!uploadDir.exists()) {
+                //noinspection ResultOfMethodCallIgnored
                 uploadDir.mkdirs();
             }
             String fileid = MainUtils.getUUID();
@@ -150,8 +149,9 @@ public class MediaController extends Handler {
         if (StringUtils.isNotBlank(id)) {
             AttachmentFile attachmentFile = attachementRes.findByIdAndOrgi(id, super.getOrgi(request));
             if (attachmentFile != null && attachmentFile.getFileid() != null) {
-                StreamingFile sf = streamingFileRes.findOne(attachmentFile.getFileid());
-                if (sf != null) {
+                Optional<StreamingFile> optional = streamingFileRes.findById(attachmentFile.getFileid());
+                if (optional.isPresent()) {
+                    StreamingFile sf = optional.get();
                     response.setContentType(attachmentFile.getFiletype());
                     response.setHeader("Content-Disposition", "attachment;filename=" + java.net.URLEncoder.encode(attachmentFile.getTitle(), "UTF-8"));
                     IOUtils.copy(sf.getData().getBinaryStream(), response.getOutputStream());
@@ -166,7 +166,7 @@ public class MediaController extends Handler {
 
     @RequestMapping("/template")
     @Menu(type = "resouce", subtype = "template")
-    public void template(HttpServletResponse response, HttpServletRequest request, @Valid String filename) throws IOException {
+    public void template(HttpServletResponse response, @Valid String filename) throws IOException {
         if (StringUtils.isNotBlank(filename)) {
             InputStream is = MediaController.class.getClassLoader().getResourceAsStream(TEMPLATE_DATA_PATH + filename);
             if (is != null) {
@@ -180,7 +180,6 @@ public class MediaController extends Handler {
                 is.close();
             }
         }
-        return;
     }
 
 }
diff --git a/contact-center/app/src/main/java/com/chatopera/cc/proxy/AgentProxy.java b/contact-center/app/src/main/java/com/chatopera/cc/proxy/AgentProxy.java
index bfb7f592..19c5df61 100644
--- a/contact-center/app/src/main/java/com/chatopera/cc/proxy/AgentProxy.java
+++ b/contact-center/app/src/main/java/com/chatopera/cc/proxy/AgentProxy.java
@@ -16,12 +16,14 @@ import com.chatopera.cc.persistence.repository.StreamingFileRepository;
 import com.chatopera.cc.socketio.message.ChatMessage;
 import com.chatopera.cc.socketio.message.Message;
 import com.chatopera.cc.util.HashMapUtils;
+import lombok.RequiredArgsConstructor;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
 import org.springframework.stereotype.Component;
 import org.springframework.util.FileCopyUtils;
 import org.springframework.web.multipart.MultipartFile;
@@ -30,45 +32,34 @@ import java.io.File;
 import java.io.IOException;
 import java.util.Date;
 import java.util.HashMap;
+import java.util.Objects;
 
 @Component
+@RequiredArgsConstructor
 public class AgentProxy {
     private final static Logger logger = LoggerFactory.getLogger(AgentProxy.class);
-
+    @NonNull
+    private final ACDPolicyService acdPolicyService;
+    @NonNull
+    private final AttachmentRepository attachementRes;
+    @NonNull
+    private final JpaBlobHelper jpaBlobHelper;
+    @NonNull
+    private final StreamingFileRepository streamingFileRepository;
+    @NonNull
+    private final PeerSyncIM peerSyncIM;
+    @NonNull
+    private final SNSAccountRepository snsAccountRes;
+    @NonNull
+    private final Cache cache;
+    @NonNull
+    private final AgentStatusRepository agentStatusRes;
     @Value("${web.upload-path}")
     private String webUploadPath;
 
-    @Autowired
-    private ACDPolicyService acdPolicyService;
-
-    @Autowired
-    private AttachmentRepository attachementRes;
-
-    @Autowired
-    private JpaBlobHelper jpaBlobHelper;
-
-    @Autowired
-    private StreamingFileRepository streamingFileRepository;
-
-    @Autowired
-    private PeerSyncIM peerSyncIM;
-
-    @Autowired
-    private SNSAccountRepository snsAccountRes;
-
-    @Autowired
-    private Cache cache;
-
-    @Autowired
-    private AgentStatusRepository agentStatusRes;
-
-
     /**
      * 设置一个坐席为就绪状态
      * 不牵扯ACD
-     *
-     * @param user
-     * @param agentStatus
      */
     public void ready(final User user, final AgentStatus agentStatus, final boolean busy) {
         agentStatus.setOrgi(user.getOrgi());
@@ -85,7 +76,7 @@ public class AgentProxy {
         SessionConfig sessionConfig = acdPolicyService.initSessionConfig(agentStatus.getOrgi());
         agentStatus.setMaxusers(sessionConfig.getMaxuser());
 
-        /**
+        /*
          * 更新当前用户状态
          */
         agentStatus.setUsers(
@@ -103,9 +94,6 @@ public class AgentProxy {
 
     /**
      * 将消息发布到接收端
-     *
-     * @param chatMessage
-     * @param agentUser
      */
     public void sendChatMessageByAgent(final ChatMessage chatMessage, final AgentUser agentUser) {
         Message outMessage = new Message();
@@ -117,7 +105,7 @@ public class AgentProxy {
         if (StringUtils.isNotBlank(agentUser.getAppid())) {
             snsAccountRes.findOneBySnsTypeAndSnsIdAndOrgi(
                     agentUser.getChannel(), agentUser.getAppid(), agentUser.getOrgi()).ifPresent(
-                    p -> outMessage.setSnsAccount(p));
+                    outMessage::setSnsAccount);
         }
 
         outMessage.setContextid(chatMessage.getContextid());
@@ -149,13 +137,8 @@ public class AgentProxy {
 
     /**
      * 发送坐席的图片消息给访客和坐席自己
-     *
-     * @param creator
-     * @param agentUser
-     * @param multipart
-     * @param sf
      */
-    public void sendFileMessageByAgent(final User creator, final AgentUser agentUser, final MultipartFile multipart, final StreamingFile sf) {
+    public void sendFileMessageByAgent(final User creator, @Nullable final AgentUser agentUser, final MultipartFile multipart, final StreamingFile sf) {
         // 消息体
         ChatMessage chatMessage = new ChatMessage();
         chatMessage.setFilename(multipart.getOriginalFilename());
@@ -163,23 +146,24 @@ public class AgentProxy {
         chatMessage.setAttachmentid(sf.getId());
         chatMessage.setMessage(sf.getFileUrl());
         chatMessage.setId(MainUtils.getUUID());
-        chatMessage.setContextid(agentUser.getContextid());
-        chatMessage.setAgentserviceid(agentUser.getAgentserviceid());
-        chatMessage.setChannel(agentUser.getChannel());
-        chatMessage.setUsession(agentUser.getUserid());
-        chatMessage.setAppid(agentUser.getAppid());
+        if (agentUser != null) {
+            chatMessage.setContextid(agentUser.getContextid());
+            chatMessage.setAgentserviceid(agentUser.getAgentserviceid());
+            chatMessage.setChannel(agentUser.getChannel());
+            chatMessage.setUsession(agentUser.getUserid());
+            chatMessage.setAppid(agentUser.getAppid());
+        }
         chatMessage.setUserid(creator.getId());
         chatMessage.setOrgi(creator.getOrgi());
         chatMessage.setCreater(creator.getId());
         chatMessage.setUsername(creator.getUname());
 
         chatMessage.setCalltype(MainContext.CallType.OUT.toString());
-        if (StringUtils.isNotBlank(agentUser.getAgentno())) {
+        if (agentUser != null && StringUtils.isNotBlank(agentUser.getAgentno())) {
             chatMessage.setTouser(agentUser.getUserid());
         }
 
-        if (multipart.getContentType() != null && multipart.getContentType().indexOf(
-                Constants.ATTACHMENT_TYPE_IMAGE) >= 0) {
+        if (multipart.getContentType() != null && multipart.getContentType().contains(Constants.ATTACHMENT_TYPE_IMAGE)) {
             chatMessage.setMsgtype(MainContext.MediaType.IMAGE.toString());
         } else {
             chatMessage.setMsgtype(MainContext.MediaType.FILE.toString());
@@ -199,23 +183,23 @@ public class AgentProxy {
             outMessage.setCreatetime(Constants.DISPLAY_DATE_FORMATTER.format(new Date()));
             outMessage.setMessageType(chatMessage.getMsgtype());
 
-            /**
+            /*
              * 通知文件上传消息
              */
             // 发送消息给访客
             peerSyncIM.send(MainContext.ReceiverType.VISITOR,
-                            MainContext.ChannelType.toValue(agentUser.getChannel()),
-                            agentUser.getAppid(), MainContext.MessageType.MESSAGE,
-                            agentUser.getUserid(),
-                            outMessage,
-                            true);
+                    MainContext.ChannelType.toValue(agentUser.getChannel()),
+                    agentUser.getAppid(), MainContext.MessageType.MESSAGE,
+                    agentUser.getUserid(),
+                    outMessage,
+                    true);
 
             // 发送给坐席自己
             peerSyncIM.send(MainContext.ReceiverType.AGENT,
-                            MainContext.ChannelType.WEBIM,
-                            agentUser.getAppid(),
-                            MainContext.MessageType.MESSAGE,
-                            agentUser.getAgentno(), outMessage, true);
+                    MainContext.ChannelType.WEBIM,
+                    agentUser.getAppid(),
+                    MainContext.MessageType.MESSAGE,
+                    agentUser.getAgentno(), outMessage, true);
 
         } else {
             logger.warn("[sendFileMessageByAgent] agent user chat is end, disable forward files.");
@@ -225,31 +209,25 @@ public class AgentProxy {
 
     /**
      * 将http的multipart保存到数据库
-     *
-     * @param creator
-     * @param multipart
-     * @return
-     * @throws IOException
-     * @throws CSKefuException
      */
     public StreamingFile saveFileIntoMySQLBlob(final User creator, final MultipartFile multipart) throws
             IOException, CSKefuException {
-        /**
+        /*
          * 准备文件夹
          */
         File uploadDir = new File(webUploadPath, "upload");
         if (!uploadDir.exists()) {
+            //noinspection ResultOfMethodCallIgnored
             uploadDir.mkdirs();
         }
 
         String fileid = MainUtils.getUUID();
         StreamingFile sf = new StreamingFile();
 
-        /**
+        /*
          * 保存到本地
          */
-        if (multipart.getContentType() != null && multipart.getContentType().indexOf(
-                Constants.ATTACHMENT_TYPE_IMAGE) >= 0) {
+        if (multipart.getContentType() != null && multipart.getContentType().contains(Constants.ATTACHMENT_TYPE_IMAGE)) {
             // 图片
             // process thumbnail
             File original = new File(webUploadPath, "upload/" + fileid + "_original");
@@ -264,7 +242,7 @@ public class AgentProxy {
             sf.setFileUrl("/res/file.html?id=" + attachmentFile.getId());
         }
 
-        /**
+        /*
          * 保存文件到MySQL数据库
          */
         sf.setId(fileid);
@@ -280,13 +258,6 @@ public class AgentProxy {
 
     /**
      * 处理multi part为本地文件
-     *
-     * @param owner
-     * @param multipart
-     * @param fileid
-     * @return
-     * @throws IOException
-     * @throws CSKefuException
      */
     public AttachmentFile processAttachmentFile(
             final User owner, final MultipartFile multipart,
@@ -306,14 +277,13 @@ public class AgentProxy {
         } else {
             attachmentFile.setFiletype(multipart.getContentType());
         }
-        File uploadFile = new File(multipart.getOriginalFilename());
-        if (uploadFile.getName() != null && uploadFile.getName().length() > 255) {
+        File uploadFile = new File(Objects.requireNonNull(multipart.getOriginalFilename()));
+        if (uploadFile.getName().length() > 255) {
             attachmentFile.setTitle(uploadFile.getName().substring(0, 255));
         } else {
             attachmentFile.setTitle(uploadFile.getName());
         }
-        if (StringUtils.isNotBlank(attachmentFile.getFiletype()) && attachmentFile.getFiletype().indexOf(
-                Constants.ATTACHMENT_TYPE_IMAGE) >= 0) {
+        if (StringUtils.isNotBlank(attachmentFile.getFiletype()) && attachmentFile.getFiletype().contains(Constants.ATTACHMENT_TYPE_IMAGE)) {
             attachmentFile.setImage(true);
         }
         attachmentFile.setFileid(fileid);
@@ -325,10 +295,6 @@ public class AgentProxy {
     /**
      * 获得一个User的AgentStatus
      * 先从缓存读取，再从数据库，还没有就新建
-     *
-     * @param agentno
-     * @param orgi
-     * @return
      */
     public AgentStatus resolveAgentStatusByAgentnoAndOrgi(final String agentno, final String orgi, final HashMap<String, String> skills) {
         logger.info(
@@ -340,9 +306,7 @@ public class AgentProxy {
             agentStatus = agentStatusRes.findOneByAgentnoAndOrgi(agentno, orgi).orElseGet(AgentStatus::new);
         }
 
-        if (skills != null) {
-            agentStatus.setSkills(skills);
-        }
+        agentStatus.setSkills(skills);
 
         return agentStatus;
     }