Sonar常见问题及修改建议：https://blog.csdn.net/libusi001/article/details/103717457

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一、报错信息

Use try-with-resources or close this "BufferedOutputStream" in a "finally" clause.

使用try-with-resources或在“ finally”子句中关闭此“ BufferedOutputStream”。

二、源代码

try {
    BufferedOutputStream out = out = new BufferedOutputStream(
                        new FileOutputStream(new File(legalizeExamTemplatePath,newFileName)));
    out.write(file.getBytes());
    out.flush();
    out.close();
} catch (IOException e) {
    return Result.error("上传失败！");
            }

如果出现异常会跳转到catch，那么out.close()就不会执行。

所以需要在“ finally”子句中关闭此“ BufferedOutputStream”。

BufferedOutputStream需要写在try外面才行，而且必须初始化，初始化为null。

这样又会报空指针异常，所以需要判空，优化代码如下；

三、优化后代码

BufferedOutputStream out = null;
try {
    out = new BufferedOutputStream(
            new FileOutputStream(new File(legalizeExamTemplatePath, newFileName)));
    out.write(file.getBytes());
    out.flush();
    log.info("上传成功！");
    return Result.success("上传成功！", null);
} catch (IOException e) {
    return Result.error("上传失败！");
} finally {
    CloseIoUtils.closeAll(out);
}

try(BufferedOutputStream out = new BufferedOutputStream(
            new FileOutputStream(new File(legalizeExamTemplatePath, newFileName)));) {
    out.write(file.getBytes());
    out.flush();
    log.info("上传成功！");
    return Result.success("上传成功！", null);
} catch (IOException e) {
    return Result.error("上传失败！");
}

Java IO流关闭工具类详解：https://blog.csdn.net/libusi001/article/details/100741637

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