下面是一个使用Spring Batch编写的示例程序,用于创建固定大小的zip文件:
首先,需要定义一个Job,其中包含一个Step来执行文件压缩操作。这个例子中,我们假设要压缩的文件都位于一个目录下,我们将使用Spring Batch的ItemReader来读取这些文件,并使用ItemWriter来将它们写入zip文件。
@Configuration
@EnableBatchProcessing
public class BatchConfig {
@Autowired
private JobBuilderFactory jobBuilderFactory;
@Autowired
private StepBuilderFactory stepBuilderFactory;
@Value("${input.folder}")
private String inputFolder;
@Value("${output.folder}")
private String outputFolder;
@Value("${zip.file.size}")
private long zipFileSize;
@Bean
public Job zipFileJob() {
return jobBuilderFactory.get("zipFileJob")
.start(zipFileStep())
.build();
}
@Bean
public Step zipFileStep() {
return stepBuilderFactory.get("zipFileStep")
.chunk(1)
.reader(fileReader())
.processor(fileProcessor())
.writer(fileWriter())
.build();
}
@Bean
public ItemReader fileReader() {
return new FileSystemResourceReader(inputFolder);
}
@Bean
public ItemProcessor fileProcessor() {
return new FileProcessor(zipFileSize);
}
@Bean
public ItemWriter fileWriter() {
return new ZipFileWriter(outputFolder);
}
}
在上面的代码中,我们使用@Value
注解来注入配置文件中的相关属性,例如输入文件夹、输出文件夹和zip文件的大小限制。
接下来,我们需要实现ItemReader、ItemProcessor和ItemWriter接口的具体实现类。
public class FileSystemResourceReader implements ItemReader {
private final File[] files;
private int index = 0;
public FileSystemResourceReader(String inputFolder) {
File folder = new File(inputFolder);
this.files = folder.listFiles();
}
@Override
public File read() throws Exception {
if (index < files.length) {
return files[index++];
} else {
return null;
}
}
}
public class FileProcessor implements ItemProcessor {
private final long zipFileSize;
public FileProcessor(long zipFileSize) {
this.zipFileSize = zipFileSize;
}
@Override
public File process(File file) throws Exception {
// Do some processing if needed
return file;
}
}
public class ZipFileWriter implements ItemWriter {
private final String outputFolder;
public ZipFileWriter(String outputFolder) {
this.outputFolder = outputFolder;
}
@Override
public void write(List extends File> items) throws Exception {
// Create a new zip file
String zipFileName = generateZipFileName();
ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(outputFolder + "/" + zipFileName));
for (File file : items) {
// Add each file to the zip archive
ZipEntry zipEntry = new ZipEntry(file.getName());
zipOutputStream.putNextEntry(zipEntry);
FileInputStream fileInputStream = new FileInputStream(file);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = fileInputStream.read(buffer)) != -1) {
zipOutputStream.write(buffer, 0, bytesRead);
}
fileInputStream.close();
zipOutputStream.closeEntry();
}
zipOutputStream.close();
}
private String generateZipFileName() {
// Generate a unique zip file name based on the current timestamp
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String timestamp = dateFormat.format(new Date());
return "files_" + timestamp + ".zip";
}
}
上面的代码中,我们实现了FileSystemResourceReader
来读取文件夹中的文件,FileProcessor
用于处理文件(如果需要的话),ZipFileWriter
来将文件写入zip文件。
最后,我们还需要在配置文件中设置相关的属性,例如输入文件夹、输出文件夹和zip文件的大小限制。
input.folder=/path/to/input/folder
output.folder=/path/to/output/folder
zip.file.size=1000000
在上面的配置中,zip.file.size
属性定义了zip文件的最大大小(以字节为单位)。
完成了以上步骤后,你可以