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IOUtil.java
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package org.yzl.house.utils;
import java.io.*;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/**
* Created by ltaoj on 2017/10/16.
*/
public class IOUtil {
/**
* 通过指定路径和文件名来获取文件对象,当文件不存在时自动创建
* @param path
* @param fileName
* @return
* @throws IOException
*/
public static File getFile(String path, String fileName) throws IOException {
// 创建文件对象
File file;
if (path != null && !path.equals(""))
file = new File(path, fileName);
else
file = new File(fileName);
if (!file.exists()) {
file.createNewFile();
}
// 返回文件
return file;
}
/**
* 获得指定文件的输出流
* @param file
* @return
* @throws FileNotFoundException
*/
public static FileOutputStream getFileStream(File file) throws FileNotFoundException {
return new FileOutputStream(file);
}
/**
* 将多个文件压缩
* @param fileList 待压缩的文件列表
* @param zipFileName 压缩文件名
* @return 返回压缩好的文件
* @throws IOException
*/
public static File getZipFile(List<File> fileList, String zipFileName) throws IOException {
File zipFile = getFile(PathConfig.getPath(), zipFileName);
// 文件输出流
FileOutputStream outputStream = getFileStream(zipFile);
// 压缩流
ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream);
int size = fileList.size();
// 压缩列表中的文件
for (int i = 0;i < size;i++) {
File file = fileList.get(i);
zipFile(file, zipOutputStream);
}
// 关闭压缩流、文件流
zipOutputStream.close();
outputStream.close();
return zipFile;
}
/**
* 将文件数据写入文件压缩流
* @param file 带压缩文件
* @param zipOutputStream 压缩文件流
* @throws IOException
*/
private static void zipFile(File file, ZipOutputStream zipOutputStream) throws IOException {
if (file.exists()) {
if (file.isFile()) {
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis);
ZipEntry entry = new ZipEntry(file.getName());
zipOutputStream.putNextEntry(entry);
final int MAX_BYTE = 10 * 1024 * 1024; // 最大流为10MB
long streamTotal = 0; // 接收流的容量
int streamNum = 0; // 需要分开的流数目
int leaveByte = 0; // 文件剩下的字符数
byte[] buffer; // byte数据接受文件的数据
streamTotal = bis.available(); // 获取流的最大字符数
streamNum = (int) Math.floor(streamTotal / MAX_BYTE);
leaveByte = (int) (streamTotal % MAX_BYTE);
if (streamNum > 0) {
for (int i = 0;i < streamNum;i++) {
buffer = new byte[MAX_BYTE];
bis.read(buffer, 0, MAX_BYTE);
zipOutputStream.write(buffer, 0, MAX_BYTE);
}
}
// 写入剩下的流数据
buffer = new byte[leaveByte];
bis.read(buffer, 0, leaveByte); // 读入流
zipOutputStream.write(buffer, 0, leaveByte); // 写入流
zipOutputStream.closeEntry(); // 关闭当前的zip entry
// 关闭输入流
bis.close();
fis.close();
}
}
}
}