fix: 异常处理

Author: weibiansanjue

src/main/java/world/weibiansanjue/doctools/javadochub/controller/JavadocController.java

@@ -83,16 +83,21 @@ private void extract(ModelAndView modelView,
 
         log.info("extract javadoc. g={} a={} v={} p={}", groupId, artifactId, version, page);
 
+        modelView.addObject("groupId", groupId)
+            .addObject("artifactId", artifactId)
+            .addObject("artifactIds", repository.artifact(groupId))
+            .addObject("version", version)
+            .addObject("page", page)
+            .setViewName("doc");
+
         Versioning versioning = repository.version(groupId, artifactId);
+        if (null == versioning) {
+            modelView.addObject("version", null == version ? "latest" : version)
+                .addObject("status", 404);
+            return;
+        }
         version = StringUtils.isEmpty(version) || "latest".equals(version) ? versioning.getRelease() : version;
-
-        modelView.addObject("groupId", groupId)
-                 .addObject("artifactId", artifactId)
-                 .addObject("artifactIds", repository.artifact(groupId))
-                 .addObject("version", version)
-                 .addObject("versions", versioning.getVersions())
-                 .addObject("page", page)
-                 .setViewName("doc");
+        modelView.addObject("versions", versioning.getVersions());
 
         int status = repository.store(groupId, artifactId, version);
         modelView.addObject("status", status);

src/main/java/world/weibiansanjue/doctools/javadochub/repository/Repository.java

@@ -93,9 +93,15 @@ public Versioning version(String groupId, String artifactId) {
         String url = String.format("%s/%s/%s/%s", rep, groupId.replace(".", "/"), artifactId, "maven-metadata.xml");
         log.info("remote version. url={}", url);
 
-        ResponseEntity<Metadata> resp = restTemplate.getForEntity(url, Metadata.class);
+        ResponseEntity<Metadata> resp = null;
+        try {
+            resp = restTemplate.getForEntity(url, Metadata.class);
+        } catch (HttpClientErrorException hcee) {
+            log.error("javadoc version 列表获取失败. hcee={}", hcee.getMessage());
+            return null;
+        }
         if (!resp.getStatusCode().is2xxSuccessful()) {
-            return new Versioning();
+            return null;
         }
         Versioning versioning = resp.getBody().getVersioning();
         Collections.reverse(versioning.getVersions());

src/main/resources/templates/doc.html

@@ -74,6 +74,7 @@
       th:src="|/${groupId}/${artifactId}/${version}/${page}|" >
     </iframe>
     <h1 th:if="${status == 404}" align="center">😅 javadoc 不存在</h1>
+    <h1 th:if="${status != 404 && status != 202}" align="center">😅 javadoc 加载失败，请重试</h1>
   </div>
 
 </div>