流未关闭导致文件无法删除

 一、错误代码

生成excel文件方法：

@Override
public void deleteHotSellingExcel() {
    File folder = new File(HOT_SELLING_PATH);
    File[] files = folder.listFiles();
    for (int i = 0; i < files.length; i++) {
        File file = files[i];
        String name = file.getName();
        if(name.contains(EXCEL_SUFFIX)){

            boolean delete = file.delete();
            System.out.println("delete = " + delete);
        }
    }
}

生成zip文件方法：

@Override
public void generateHotSellingZip() {
    try {
        String zipPath = HOT_SELLING_PATH+"/"+hot_selling_name+ZIP_SUFFIX;
        ZipOutputStream  zipOut = new ZipOutputStream(new FileOutputStream(zipPath));
        File folder = new File(HOT_SELLING_PATH);
        File[] files = folder.listFiles();
        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            String name = file.getName();
            if(name.contains(EXCEL_SUFFIX)){
                zipOut.putNextEntry(new ZipEntry(name));
                FileInputStream fis = new FileInputStream(file.getAbsoluteFile());
                byte[] buffer = new byte[1024];
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    zipOut.write(buffer, 0, length);
                }
                zipOut.closeEntry();
            }
        }

        zipOut.close();
    } catch (Exception e) {
        log.error("生成热销品压缩文件错误，错误详情:{}",e);
        throw new BizException(FAIL_CODE,"生成热销品压缩文件错误");
    }
}

主方法：

        先生成excel之后删除excel，但是由于没有关闭fis的文件流，导致文件无法删除，因此关闭文件流即可

generateHotSellingZip();
deleteHotSellingExcel();

二、正确代码

@Override
public void generateHotSellingZip() {
    try {
        String zipPath = HOT_SELLING_PATH+"/"+hot_selling_name+ZIP_SUFFIX;
        ZipOutputStream  zipOut = new ZipOutputStream(new FileOutputStream(zipPath));
        File folder = new File(HOT_SELLING_PATH);
        File[] files = folder.listFiles();
        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            String name = file.getName();
            if(name.contains(EXCEL_SUFFIX)){
                zipOut.putNextEntry(new ZipEntry(name));
                FileInputStream fis = new FileInputStream(file.getAbsoluteFile());
                byte[] buffer = new byte[1024];
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    zipOut.write(buffer, 0, length);
                }
                zipOut.closeEntry();
                fis.close();//加上了这个代码
            }
        }

        zipOut.close();
    } catch (Exception e) {
        log.error("生成热销品压缩文件错误，错误详情:{}",e);
        throw new BizException(FAIL_CODE,"生成热销品压缩文件错误");
    }
}