一、说明
rar格式的压缩包收费,java支持zip格式的压缩和解压
二、工具类
import java.io.*;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
public class ZipUtils {
private static final int BUFFER_SIZE = 2 * 1024;
/**
* zip解压
* @param srcFile zip源文件
* @param destDirPath 解压后的目标文件夹
* @throws RuntimeException 解压失败会抛出运行时异常
*/
public static void unZip(File srcFile, String destDirPath) throws RuntimeException {
long start = System.currentTimeMillis();
// 判断源文件是否存在
if (!srcFile.exists()) {
throw new RuntimeException(srcFile.getPath() + "所指文件不存在");
}
// 开始解压
ZipFile zipFile = null;
try {
zipFile = new ZipFile(srcFile);
Enumeration<?> entries = zipFile.entries();
while (entries.hasMoreElements()) {
ZipEntry entry = (ZipEntry) entries.nextElement();
System.out.println("解压" + entry.getName());
// 如果是文件夹,就创建个文件夹
if (entry.isDirectory()) {
String dirPath = destDirPath + "/" + entry.getName();
File dir = new File(dirPath);
dir.mkdirs();
} else {
// 如果是文件,就先创建一个文件,然后用io流把内容copy过去
File targetFile = new File(destDirPath + "/" + entry.getName());
// 保证这个文件的父文件夹必须要存在
if(!targetFile.getParentFile().exists()){
targetFile.getParentFile().mkdirs();
}
targetFile.createNewFile();
// 将压缩文件内容写入到这个文件中
InputStream is = zipFile.getInputStream(entry);
FileOutputStream fos = new FileOutputStream(targetFile);
int len;
byte[] buf = new byte[BUFFER_SIZE];
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
}
// 关流顺序,先打开的后关闭
fos.close();
is.close();
}
}
long end = System.currentTimeMillis();
System.out.println("解压完成,耗时:" + (end - start) +" ms");
} catch (Exception e) {
throw new RuntimeException("unzip error from ZipUtils", e);
} finally {
if(zipFile != null){
try {
zipFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* 压缩成ZIP 方法
* @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<File> srcFiles , OutputStream out)throws Exception {
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 (Exception e) {
e.printStackTrace();
}
}
}
}
}
三、使用工具类压缩和解压文件
import com.szfore.utils.ZipUtils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
public class TestZip {
public static void main(String[] args) throws Exception{
//testToZip();
testUnzip();
}
/**
* 测试压缩文件
*/
public static void testToZip() throws Exception {
File file1 = new File("c:\\1.txt");
File file2 = new File("c:\\2.txt");
List<File> files = new ArrayList<File>();
files.add(file1);
files.add(file2);
OutputStream out = new FileOutputStream("c:\\1.zip");
ZipUtils.toZip(files,out);
}
/**
* 测试解压文件
* @throws Exception
*/
public static void testUnzip() throws Exception{
File srcFile = new File("c:\\2.zip");
String destDirPath = "c:\\";
ZipUtils.unZip(srcFile,destDirPath);
}
}