关于spring-mvc:上传文件异步处理注意事项

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上传 Excel 进行解决不必用户期待解决完之后会邮件告知处理结果
所以是异步解决

public void readExcel(@RequestParam("file") MultipartFile file) {CompletableFuture.runAsync(() -> {
        try {service.readExcel(file);
        } catch (IOException e) {e.printStackTrace();
        }
    });
}

理论应用的过程中发现常常上传失败报错如下

java.io.FileNotFoundException: /private/tmp/upload_2cc08ec8_c3eb_4633_8c0f_0cc20e34ff55_00000000.tmp (No such file or directory)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at org.apache.tomcat.util.http.fileupload.disk.DiskFileItem.getInputStream(DiskFileItem.java:188)
    at org.apache.catalina.core.ApplicationPart.getInputStream(ApplicationPart.java:100)
    at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile.getInputStream(StandardMultipartHttpServletRequest.java:297)

申请返回后会主动删除临时文件导致理论读取 Excel 的时候找不到文件

// org.apache.catalina.core.ApplicationPart#delete
public void delete() throws IOException {fileItem.delete();
}

复制该临时文件将复制后的文件传给异步程序处理解决完之后删除该临时文件

String uuid = UUID.randomUUID().toString().replace('-', '_');
String tmpFileName = String.format("/tmp/upload_%s.tmp", uuid);
final File tmpFile = new File(tmpFileName);
try {Files.copy(file.getInputStream(), tmpFile.toPath());
} catch (IOException e) {e.printStackTrace();
}
CompletableFuture.runAsync(() -> {
    try {service.readExcel(tmpFile);
    } catch (IOException e) {e.printStackTrace();
    }
});

https://stackoverflow.com/que…

正文完