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

问题描述

Sonar 给出了一个错误，提示该 FileOutputStream 应该被关闭.我需要修改以下代码以使用 try-with-resources.我该怎么做?

Sonar is giving an error that this FileOutputStream should be closed. I need to modify the following code to use try-with-resources. How do I do this?

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);
    }
}

推荐答案

当前代码还没有准备好处理异常 - 你缺少 finally 块来关闭打开的流.而且，当然，你是对的 - 使用 try-with-resources 解决了这个问题:

Currently code is not ready to handle exceptions - you're missing finally block to close open streams. And, sure, you're right - using try-with-resources solves this problem:

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);
    }
}

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