把文件夹打包为ZIP格式的文件，不压缩！！
不压缩生成zip文件又称《文档归类存储》，经过测试效率对比压缩方式提高50%左右！！
废话不多说，直接上代码：
private static final int BUFFER_SIZE = 2 * 1024;
/**
* 指定压缩成zip
* @param srcFiles 需要压缩的文件列表
* @param out 压缩文件输出流
* @throws RuntimeException 压缩失败会抛出运行时异常
*/
public static void toZip(List srcFiles , OutputStream out)throws RuntimeException {
long start = System.currentTimeMillis();
ZipOutputStream zos = null ;
try {
zos = new ZipOutputStream(out);
for (File srcFile : srcFiles) {
byte[] buf = new byte[BUFFER_SIZE];
zos.putNextEntry(new ZipEntry(srcFile.getName()));
int len;
FileInputStream in = new FileInputStream(srcFile);
while ((len = in.read(buf)) != -1){
zos.write(buf, 0, len);
}
zos.closeEntry();
in.close();
}
long end = System.currentTimeMillis();
System.out.println("压缩完成，耗时：" + (end - start) +" ms");
} catch (Exception e) {
throw new RuntimeException("zip error from ZipUtils",e);
}finally{
if(zos != null){
try {
zos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
*
* 归类存储模式：把文件夹打包成Zip格式的文件，不进行压缩
* @param srcDir 压缩文件夹路径
* @param out 压缩文件输出流
* @param KeepDirStructure 是否保留原来的目录结构,
* true:保留目录结构;
* false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
* @throws RuntimeException 压缩失败会抛出运行时异常
*/
public static void toZip(String[] srcDir, OutputStream out,
boolean KeepDirStructure) throws RuntimeException, Exception {
long start = System.currentTimeMillis();
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(out);
List sourceFileList = new ArrayList();
for (String dir : srcDir) {
File sourceFile = new File(dir);
sourceFileList.add(sourceFile);
}
compress(sourceFileList, zos, KeepDirStructure);
long end = System.currentTimeMillis();
System.out.println("压缩完成，耗时：" + (end - start) + " ms");
} catch (Exception e) {
throw new RuntimeException("zip error from ZipUtils", e);
} finally {
if (zos != null) {
try {
zos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
*
* 方法名：getFileBytes
* 描述：获取文件的bytes
* 创建时间：2016-12-14 下午2:23:33
* @param file
* @return
* @throws FileNotFoundException
* @throws IOException
*/
public static byte[] getFileBytes(File file) throws FileNotFoundException,
IOException {
byte[] buffer;
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
byte[] b = new byte[1000];
int n;
while ((n = fis.read(b)) != -1) {
bos.write(b, 0, n);
}
fis.close();
bos.close();
buffer = bos.toByteArray();
return buffer;
}
/**
* 递归压缩方法
* @param sourceFile 源文件
* @param zos zip输出流
* @param name 压缩后的名称
* @param KeepDirStructure 是否保留原来的目录结构,
* true:保留目录结构;
* false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
* @throws Exception
*/
private static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception {
byte[] buf = new byte[BUFFER_SIZE];
if (sourceFile.isFile()) {
//此处是重点，不压缩设置
ZipEntry zipEntry = new ZipEntry(name);
zipEntry.setMethod(ZipEntry.STORED);
zipEntry.setCompressedSize(sourceFile.length());
zipEntry.setSize(sourceFile.length());
CRC32 crc = new CRC32();
crc.update(getFileBytes(sourceFile));
zipEntry.setCrc(crc.getValue());
zos.putNextEntry(zipEntry);
int len;
FileInputStream in = new FileInputStream(sourceFile);
while ((len = in.read(buf)) != -1) {
zos.write(buf, 0, len);
}
// Complete the entry
zos.closeEntry();
in.close();
} else {
File[] listFiles = sourceFile.listFiles();
if (listFiles == null || listFiles.length == 0) {
if (KeepDirStructure) {
ZipEntry zipEntry = new ZipEntry(name + "/");
zipEntry.setMethod(ZipEntry.STORED);
zipEntry.setCompressedSize(sourceFile.length());
zipEntry.setSize(sourceFile.length());
CRC32 crc = new CRC32();
crc.update(getFileBytes(sourceFile));
zipEntry.setCrc(crc.getValue());
zos.putNextEntry(zipEntry);
zos.closeEntry();
}
} else {
for (File file : listFiles) {
if (KeepDirStructure) {
compress(file, zos, name + "/" + file.getName(),
KeepDirStructure);
} else {
compress(file, zos, file.getName(), KeepDirStructure);
}
}
}
}
}
private static void compress(List sourceFileList, ZipOutputStream zos, boolean KeepDirStructure) throws Exception {
byte[] buf = new byte[BUFFER_SIZE];
for (File sourceFile : sourceFileList) {
String name = sourceFile.getName();
if (sourceFile.isFile()) {
zos.putNextEntry(new ZipEntry(name));
int len;
FileInputStream in = new FileInputStream(sourceFile);
while ((len = in.read(buf)) != -1) {
zos.write(buf, 0, len);
}
zos.closeEntry();
in.close();
} else {
File[] listFiles = sourceFile.listFiles();
if (listFiles == null || listFiles.length == 0) {
if (KeepDirStructure) {
zos.putNextEntry(new ZipEntry(name + "/"));
zos.closeEntry();
}
} else {
for (File file : listFiles) {
if (KeepDirStructure) {
compress(file, zos, name + "/" + file.getName(),
KeepDirStructure);
} else {
compress(file, zos, file.getName(),
KeepDirStructure);
}
}
}
}
}
}