修改文件下载方式，使用StreamingResponseBody，支持大文件下载

src/main/java/cn/somkit/fmt/action/DownloadAction.java

@@ -9,18 +9,24 @@ import cn.somkit.fmt.utils.PathUtils;
 import cn.somkit.fmt.utils.RocksDBUtils;
 import jakarta.servlet.http.HttpServletResponse;
 import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.FileSystemUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.*;
+import org.springframework.web.context.request.async.DeferredResult;
 import org.springframework.web.servlet.ModelAndView;
+import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody;
 
 import java.io.*;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.text.SimpleDateFormat;
 import java.util.*;
 import java.util.stream.Collectors;
@@ -91,32 +97,45 @@ public class DownloadAction {
         return mv;
     }
 
-    @RequestMapping("/execute")
-    @ApiOperate(description = "单文件下载")
-    public void execute(String path, Boolean temp, HttpServletResponse response) throws Exception {
-        File file = new File(path);
-        if (!file.isFile()) {
-            throw new FileNotFoundException("文件不存在");
+    @ApiOperate(description = "StreamingResponseBody方式下载文件")
+    @GetMapping(value = "/file", produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
+    public DeferredResult<ResponseEntity<StreamingResponseBody>> downloadFileByPath(String path, Boolean temp) throws Exception {
+        final File file = new File(path);
+        final DeferredResult<ResponseEntity<StreamingResponseBody>> result = new DeferredResult<>();
+
+        if (!file.exists()) {
+            result.setErrorResult(new RuntimeException("文件不存在"));
+            return result;
         }
-        String filename = file.getName();
-        response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + URLEncoder.encode(filename, StandardCharsets.UTF_8));
-        response.setHeader(HttpHeaders.CONTENT_LENGTH, String.valueOf(file.length()));
-        try (FileInputStream fileInputStream = new FileInputStream(file);
-             BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
-             BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(response.getOutputStream())) {
-            byte[] buffer_ = new byte[1024];
-            int n = bufferedInputStream.read(buffer_);
-            while (n != -1) {
-                bufferedOutputStream.write(buffer_);
-                n = bufferedInputStream.read(buffer_);
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + URLEncoder.encode(file.getName(), StandardCharsets.UTF_8));
+        headers.add(HttpHeaders.CONTENT_LENGTH, String.valueOf(file.length()));
+        StreamingResponseBody body = outputStream -> {
+            try (InputStream inputStream = new FileInputStream(file)) {
+                byte[] buffer = new byte[1024];
+                int bytesRead;
+                while ((bytesRead = inputStream.read(buffer)) != -1) {
+                    outputStream.write(buffer, 0, bytesRead);
                 }
-        } catch (Exception e) {
-            e.printStackTrace();
+                outputStream.flush();
+            } catch (IOException e) {
+                throw new RuntimeException("IO错误: " + e.getMessage());
             } finally {
-            if(temp){//删除临时文件
-                FileSystemUtils.deleteRecursively(new File(path));
+                // 尝试在流关闭后删除文件
+                try {
+                    if(temp){
+                        Files.deleteIfExists(file.toPath());
+                    }
+                } catch (IOException e) {
+                    // 记录日志或采取其他措施
+                    System.err.println("删除文件失败: " + e.getMessage());
                 }
             }
+        };
+
+        result.setResult(new ResponseEntity<>(body, headers, HttpStatus.OK));
+        return result;
     }
 
     @PostMapping("/packZip")

src/main/resources/templates/download.html

@@ -108,7 +108,7 @@
 
         const fileDown = (obj) => {
             const path = obj.getAttribute("value");
-            window.open(Fmt.ctx() + '/download/execute?path=' + encodeURIComponent(path) + '&temp=' + false);
+            window.open(Fmt.ctx() + '/download/file?path=' + encodeURIComponent(path) + '&temp=' + false);
         };
 
         window.onload = () => {
@@ -139,7 +139,7 @@
                 };
                 Fmt.axios(options).then((result) => {
                     message.update({content: '压缩包' + result.filename + "创建完成，准备下载文件......", result: 'success'}).show();
-                    window.open(Fmt.ctx() + '/download/execute?path=' + encodeURIComponent(result.path) + '&temp=' + true);
+                    window.open(Fmt.ctx() + '/download/file?path=' + encodeURIComponent(result.path) + '&temp=' + true);
                 }).catch((err) => {
                     console.log(err);
                     new axMessage({content: err, result: 'error', iconShow: true}).show();

版本记录/readme.md

@@ -23,4 +23,5 @@
     修改上传文件目录配置，使其支持使用相对路径
     新增临时文件存放地址配置，支持相对路径
     新增系统设置页面，支持在线配置上传文件地址、日志文件地址等参数
+    修改文件下载方式，使用StreamingResponseBody，支持大文件下载
 ```