处理添加分享人员时相关逻辑

doc-biz/src/main/java/com/doc/biz/controller/DocShareController.java

@@ -13,6 +13,7 @@ import io.swagger.annotations.ApiParam;
 import org.springframework.web.bind.annotation.*;
 
 import javax.annotation.Resource;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -45,8 +46,24 @@ public class DocShareController extends BaseController {
     @ApiOperation("添加人员")
     @PostMapping("/{docId}")
     public AjaxResult share(@ApiParam(value = "文件ID", required = true) @PathVariable(name = "docId") Long docId, @ApiParam(value = "分享人员", required = true) @RequestBody List<Long> users) {
+        //获取之前已选择的人员
+        List<DocShare> list = docShareService.selectDocShareListByDocId(docId);
         docShareService.deleteDocShareByDocId(docId);
+        List<Long> oldUsers = new ArrayList<>();
+        list.forEach(au -> {
+            if (!users.contains(au.getUserId())) {
+                //如果当前列表没有的人员，则删除数据库记录
+                docShareService.deleteDocShareByShareId(au.getShareId());
+            } else {
+                //如果数据库中已有该用户，则记录下来，后面的逻辑中使用
+                oldUsers.add(au.getUserId());
+            }
+        });
         users.forEach(uid -> {
+            if (oldUsers.contains(uid)) {
+                //如果数据库中已有，则不作任何处理
+                return;
+            }
             //发送消息
             ChatMsg msg = new ChatMsg();
             msg.setMsgType("1");