2026-4-2提交：pdf预览接口

src/main/java/com/southern/power/grid/controller/DnerEventExportRecordController.java

@@ -8,6 +8,8 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
+import javax.servlet.http.HttpServletResponse;
+
 /**
  * 事件导出记录 - Controller层
  *
@@ -42,4 +44,9 @@ public class DnerEventExportRecordController {
     public ResponseEntity<Resource> download(@PathVariable String id) {
         return dnerEventExportRecordService.download(id);
     }
+
+    @GetMapping("/preview/{id}")
+    public void previewPdf(@PathVariable Long id, HttpServletResponse response) {
+        dnerEventExportRecordService.previewPdf(id, response);
+    }
 }

src/main/java/com/southern/power/grid/service/IDnerEventExportRecordService.java

@@ -6,6 +6,8 @@ import org.springframework.core.io.Resource;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.multipart.MultipartFile;
 
+import javax.servlet.http.HttpServletResponse;
+
 /**
  * 事件导出记录 服务接口
  *
@@ -29,4 +31,12 @@ public interface IDnerEventExportRecordService extends IService<DnerEventExportR
      * @return 响应体
      */
     ResponseEntity<Resource> download(String id);
+
+    /**
+     * 预览PDF
+     *
+     * @param id       导出记录ID
+     * @param response 响应体
+     */
+    void previewPdf(Long id, HttpServletResponse response);
 }

src/main/java/com/southern/power/grid/service/impl/DnerEventExportRecordServiceImpl.java

@@ -14,7 +14,13 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;
 
+import javax.servlet.http.HttpServletResponse;
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.OutputStream;
+import java.net.URLEncoder;
 import java.time.LocalDateTime;
 
 /**
@@ -60,4 +66,35 @@ public class DnerEventExportRecordServiceImpl
         }
         return FileDownloadUtil.downLoad(record.getFilePath(), record.getFileName());
     }
+
+    @Override
+    public void previewPdf(Long id, HttpServletResponse response) {
+        DnerEventExportRecord record = getById(id);
+        File pdfFile = new File(record.getFilePath());
+
+        if (!pdfFile.exists()) {
+            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
+            return;
+        }
+
+        try (FileInputStream fis = new FileInputStream(pdfFile);
+             BufferedInputStream bis = new BufferedInputStream(fis);
+             OutputStream os = response.getOutputStream()) {
+
+            // 设置响应头 = 关键：告诉浏览器这是PDF，直接预览
+            response.setContentType("application/pdf");
+            response.setHeader("Content-Disposition",
+                    "inline;filename=" + URLEncoder.encode(pdfFile.getName(), "UTF-8"));
+
+            // 写出文件流
+            byte[] buffer = new byte[1024];
+            int len;
+            while ((len = bis.read(buffer)) != -1) {
+                os.write(buffer, 0, len);
+            }
+
+        } catch (Exception e) {
+            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
+        }
+    }
 }

src/main/resources/application.yml

@@ -9,7 +9,7 @@ spring:
     driver-class-name: com.mysql.cj.jdbc.Driver
     url: jdbc:mysql://127.0.0.1:3306/south_power_grid?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8&autoReconnect=true&rewriteBatchedStatements=true&allowPublicKeyRetrieval=true&nullCatalogMeansCurrent=true
     username: root
-    password: 123456
+    password: 123456 # Nfdw@202510
     hikari:
       connection-timeout: 30000
       validation-timeout: 5000