Update

src/main/java/com/pyc/campus/controller/WebController.java

@@ -228,9 +228,17 @@ public class WebController {
         String currentStudentId = ((UserDetails) securityContext.getAuthentication().getPrincipal()).getUsername();
         Student s = studentRepository.findNameByStudentID(currentStudentId);
         model.addAttribute("curUse",s);
-        long nextId = newsRepository.countAll()+1;
+        long i=0;
+        List<News> list = newsRepository.findAll();
+        for(News l:list){
+            if(l != null)
+            {
+                i++;
+            }
+        }
+        long nextId = i+1;
         News news = new News(nextId,title,content);
         newsRepository.save(news);
-        return "/page/BrowseNews";
+        return "/page/PublishNews";
     }
 }

src/main/java/com/pyc/campus/dao/NewsRepository.java

@@ -10,9 +10,6 @@ package com.pyc.campus.dao;
 
 import com.pyc.campus.domain.News;
 import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Modifying;
-import org.springframework.data.jpa.repository.Query;
 
 public interface NewsRepository extends JpaRepository<News,Long> {
-    Long countAll();
 }

src/main/resources/templates/page/BrowseNews.html

@@ -169,9 +169,8 @@
 </div>
 <div id="footer">
     <div class="container">
-        <p>
-            <span>Campus logo</span>
-            <span>@2020 御承扬Copyright&copy;2020-05-04</span>
+        <p style="color: white;text-align: center;">
+            @2020 御承扬Copyright&copy;2020-05-04
         </p>
     </div>
 </div>

src/main/resources/templates/page/PublishNews.html

@@ -78,7 +78,7 @@
 </div>
 <div class="main">
     <h1><span th:text="${curUse.getName()}"></span>您好！ </h1>
-    <form class="form-horizontal" name="newsForm" method="post" action="/saveNews" onsubmit="return checkTitleAndContent(newsForm.title, newsForm.content)">
+    <form class="form-horizontal" name="newsForm" method="post" th:action="@{/saveNews}" action="/saveNews" onsubmit="return checkTitleAndContent(newsForm.title, newsForm.content)">
         <table style="text-align: center;width: 450px;height: 300px;border: 1px;">
             <tr>
                 <td style="text-align: center;height: 40px" colspan="2">