英文:
Error With BufferedOutputStream java :The constructor BufferedOutputStream(FileOutputStream) is undefined
问题
你好，大家好，请帮我解决一些错误。我尝试在 Spring Boot 和 React.js 中导入 Excel 文件，但在后端我遇到了错误。
错误信息是：
构造函数 BufferedOutputStream(FileOutputStream) 未定义。
出错的代码段如下：
@RequestMapping(value="/upload", method=RequestMethod.POST)public @ResponseBody ResponseEntity<String> handleFileUpload(@RequestParam("name") String name,@RequestParam("file") MultipartFile file) throws Exception {if (name.contains("/")) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("不允许使用文件夹分隔符。");} else if (name.contains("/")) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("不允许使用相对路径。");} else if (!name.endsWith(".jar")) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("不允许的文件类型。必须是以 '.jar' 结尾的 Jar 文件类型。");}if (!file.isEmpty()) {try {byte[] bytes = file.getBytes();BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(name)));stream.write(bytes);stream.close();return ResponseEntity.ok("文件 " + name + " 已上传。");} catch (Exception e) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body(e.getMessage());}} else {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("上传失败，因为文件为空：" + name);}}
问题出现在以下代码行：
BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(name)));
英文:
hello everyone please i get some erorr so i try to import excel file with spring boot et React js
but in my backend i got error
The constructor BufferedOutputStream(FileOutputStream) is undefined
the method is :
@RequestMapping(value="/upload", method=RequestMethod.POST)public @ResponseBody ResponseEntity<String> handleFileUpload(@RequestParam("name") String name,@RequestParam("file") MultipartFile file) throws Exception{if (name.contains("/")) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("Folder separators not allowed.");} else if (name.contains("/")) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("Relative pathnames not allowed.");} else if (!name.endsWith(".jar")) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("File type not allowed. Must be a Jar file type ending in '.jar'.");}if (!file.isEmpty()) {try {byte[] bytes = file.getBytes();BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(name)));stream.write(bytes);stream.close();return ResponseEntity.ok("File " + name + " uploaded.");} catch (Exception e) {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body(e.getMessage());}} else {return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body("You failed to upload " + name + " because the file was empty.");}}}
i get error in this line :
BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(name)));
答案1
得分: 0
唯一我能想到的原因是，你导入了一个与下面代码不同的类：
import java.io.BufferedOutputStream;
英文:
The only reason I can think of is, you have imported a different class than following
import java.io.BufferedOutputStream;
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