Sonar：如何使用try-with-resources关闭FileOutputStream

Question

Sonar报错，提示应该关闭这个FileOutputStream。我需要修改下面的代码，使用try-with-resources。如何实现？

public void archivingTheFile(String zipFile){
    byte[] buffer = new byte[1024];
    try{
        FileOutputStream fos = new FileOutputStream(zipFile);
        ZipOutputStream zos = new ZipOutputStream(fos);
        for(String file : this.fileList){
            ZipEntry ze= new ZipEntry(file);
            zos.putNextEntry(ze);
            FileInputStream in = new FileInputStream(SOURCE_FOLDER + File.separator + file);
            int len;
            while ((len = in.read(buffer)) > 0) {
                zos.write(buffer, 0, len);
            }
            in.close();
        }
        zos.closeEntry();
        zos.close();
    }catch(IOException ex){
        LOGGER.error("Exception occurred while zipping file",ex);
    }
}

- user1921479

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我改了问题的措辞，增加了标签并改进了标题，以使其更清楚明确。 - CocoNess

Answer 1

目前的代码还不能处理异常 - 没有finally块来关闭打开的流。而且，确实，使用try-with-resources可以解决这个问题：

public void archivingTheFile(String zipFile) {
    byte[] buffer = new byte[1024];
    try (FileOutputStream fos = new FileOutputStream(zipFile);
         ZipOutputStream zos = new ZipOutputStream(fos)) {
        for(String file : this.fileList) {
            try (FileInputStream in = new FileInputStream(SOURCE_FOLDER + File.separator + file)) {
                ZipEntry ze = new ZipEntry(file);
                zos.putNextEntry(ze);
                int len;
                while ((len = in.read(buffer)) > 0) {
                    zos.write(buffer, 0, len);
                }
            }
        }
    } catch(IOException ex) {
        LOGGER.error("Exception occurred while zipping file",ex);
    }
}

- bsiamionau