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src/main/java/com/hao/digitalsignature/controller/FileDealController.java

 package com.hao.digitalsignature.controller;
 
+import com.hao.digitalsignature.entity.Files;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -56,10 +57,11 @@ public class FileDealController {
     public static void downFile(@RequestBody String fileName, HttpServletRequest request,
                                 HttpServletResponse response) {
         // 得到要下载的文件名
-        //String fileName = filename.substring(4);
-
         fileName = fileName.substring(0,fileName.length()-1);
-//        fileName="666.jpg";
+
+        FilesController  filesController=new FilesController();
+        filesController.search(fileName);
+        System.out.println(filesController.search(fileName));
 
         try {
             File filep = new File("");
@@ -103,6 +105,7 @@ public class FileDealController {
             in.close();
             // 关闭输出流
             out.close();
+
         } catch (Exception e) {
             System.out.println("error");
         }

src/main/java/com/hao/digitalsignature/controller/FilesController.java

 package com.hao.digitalsignature.controller;
 
 
+import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.hao.digitalsignature.encryption.DSASign;
 import com.hao.digitalsignature.encryption.RSAEncrypt;
 import com.hao.digitalsignature.entity.User;
@@ -46,6 +48,15 @@ public class FilesController {
 //        File file = new File(path+photo.getOriginalFilename());
 //        photo.transferTo(file);
 //    }
+    @GetMapping("file/search")
+    public Object search(String name){
+
+        QueryWrapper<Files> wrapper = new QueryWrapper<>();
+        wrapper.eq("picture_realname", name);
+        Files files = fileMapper.selectOne(wrapper);
+        return files;
+    }
+
     @PutMapping("/file/update")
     public String update(int id,String name){
         Files file = fileMapper.selectById(id);
@@ -60,9 +71,6 @@ public class FilesController {
     @PostMapping("/file/save")
     public String save(@RequestBody Files file){
         System.out.println(file);
-
-
-
         BigInteger back[]=new BigInteger[2];
         int j=0;
         Base64 base64 = new Base64();