下载文件

dq-financial-guarantee/src/main/java/com/daqing/financial/guarantee/controller/DgApplyAmountInfoController.java

@@ -37,8 +37,7 @@ import org.springframework.web.multipart.MultipartFile;
 import javax.annotation.Resource;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import java.io.File;
+import java.io.*;
-import java.io.IOException;
 import java.util.*;
 
 /**
@@ -144,6 +143,38 @@ public class DgApplyAmountInfoController implements DgApplyAmountInfoControllerA
         return ResponseResult.SUCCESS(list);
     }
 
+    /**
+     * 下载单个文件
+     *
+     * @param response
+     * @param fileName
+     * @return
+     */
+    @RequestMapping("/download")
+    public String download(HttpServletResponse response, @RequestParam("fileName") String fileName) {
+        File file = new File(PromptSuccess.FILE_URL_PATH + fileName);
+        if (file.exists()) {
+            response.setContentType("application/force-download;charset=UTF-8");
+            response.setCharacterEncoding("UTF-8");
+            response.setHeader("Content-Disposition", "attachment;fileName =" + fileName);
+            byte[] buffer = new byte[1024];
+
+            try (FileInputStream inputStream = new FileInputStream(file);
+                 OutputStream outStream = response.getOutputStream();
+                 BufferedInputStream buffStream = new BufferedInputStream(inputStream);) {
+                int i = 0;
+                while ((i = buffStream.read(buffer)) != -1) {
+                    outStream.write(buffer);
+                    outStream.write(buffer, 0, i);
+                }
+                return "download success";
+            } catch (Exception e) {
+                log.error("download error {}", e.getMessage());
+            }
+        }
+        return null;
+    }
+
     /**
      * 删除服务上的文件
      * @param filePath 路径