编写查询专题库专利pdf首页清单接口（未完成已注释掉）

PAS/src/main/java/cn/cslg/pas/service/PatentInstructionService.java

@@ -37,6 +37,7 @@ import org.apache.pdfbox.pdmodel.font.PDFont;
 import org.apache.pdfbox.pdmodel.font.PDType1Font;
 import org.apache.pdfbox.rendering.ImageType;
 import org.apache.pdfbox.rendering.PDFRenderer;
+import org.springframework.cache.Cache;
 import org.springframework.cache.CacheManager;
 import org.springframework.context.annotation.Lazy;
 import org.springframework.data.redis.cache.RedisCacheManager;
@@ -72,7 +73,6 @@ public class PatentInstructionService extends ServiceImpl<PatentInstructionMappe
     private final MessageService messageService;
     private final FileManagerService fileManagerService;
     private final CacheManager cacheManager;
-    private final RedisCacheManager redisCacheManager;
     private final CyCacheUtil cyCacheUtil;
     private final FileUtils fileUtils;
     private final LoginUtils loginUtils;
@@ -561,20 +561,35 @@ public class PatentInstructionService extends ServiceImpl<PatentInstructionMappe
                 continue;
             }
 
-            //解析当前专利号的pdf文件，将pdf首页转换为图片数据并返回，使用名称为"imgData"的缓存进行处理
-            String imgData = cyCacheUtil.getImgData(patentNo, pdfFile);
-            patent.setPdfFirstPage(imgData);
 
+            Cache.ValueWrapper patentNoImgData = cacheManager.getCache("imgData").get(patentNo);
+            String imgData;
+            if (patentNoImgData == null) {  //即当前专利号对应的pdf首页图片数据不在缓存里，则先进行缓存，后返回图片数据
+                imgData = cyCacheUtil.getImgData(patentNo, pdfFile);
+            } else {  //即当前专利号对应的pdf首页图片数据已在缓存里，则先从缓存里取出图片数据并返回后，再删除缓存
+                imgData = cyCacheUtil.getImgData(patentNo, pdfFile);
+                cyCacheUtil.deleteImgData(patentNo);
+            }
+
+            patent.setPdfFirstPage(imgData);
         }
 
-        //开启一个线程继续去拿当前专利后面5件专利
+        //开启一个线程去拿当前专利后面5件专利
         Thread thread = new Thread() {
             @Override
             public void run() {
+                //根据当前页和每页条数，计算后面5件专利的位置
                 Long current = params.getCurrent();
-                //Long size = params.getSize();
-                //long beforeNum = current * size;
-                params.setCurrent(++current);
+                Long size = params.getSize();
+                long beforeNum = current * size;
+                long page = beforeNum / 5;
+                if (page == 0) {  //即当前检索到第1 - 4个专利，则接下来按照current=1，size=5继续检索并缓存专利pdf首页图片数据
+                    current = 1L;
+                } else {  //即当前检索到超过5个专利，则接下来按照current = page + 1，size=5继续检索并缓存专利pdf首页图片数据
+                    current = page + 1;
+                }
+                params.setCurrent(current);
+                params.setSize(5L);
                 try {
                     threadRunTask(params);
                 } catch (IOException e) {
@@ -589,6 +604,11 @@ public class PatentInstructionService extends ServiceImpl<PatentInstructionMappe
         return pageList;
     }
 
+    /**
+     * 根据检索条件，将检索到的专利的pdf首页图片数据缓存到内存中
+     *
+     * @param params 检索条件
+     */
     public void threadRunTask(PatentVO params) throws IOException {
         //根据筛选条件分页查询专利清单（这一次查询目的只是获得专利总数和总页数）
         IPage<PatentDTO> pageList = patentService.getPageList(params);