使用java自带的API实现zip解压缩
java处理文件时，有时候需要对文件进行zip压缩操作，可以使用java自带的api实现解压缩功能。
1.压缩
1.1 将文件压缩到指定的zip文件
/**
* 压缩多个文件成一个zip文件
*
* @param srcFiles：源文件列表
* @param destZipFile：压缩后的文件
*/
public static void toZip(File[] srcFiles, File destZipFile) {
byte[] buf = new byte[1024];
try {
// ZipOutputStream类：完成文件或文件夹的压缩
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(destZipFile));
for (int i = 0; i < srcFiles.length; i++) {
FileInputStream in = new FileInputStream(srcFiles[i]);
// 给列表中的文件单独命名
out.putNextEntry(new ZipEntry(srcFiles[i].getName()));
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
out.closeEntry();
in.close();
}
out.close();
log.info("压缩完成.");
} catch (Exception e) {
log.error("压缩出错,", e);
}
}
1.2 通过浏览器响应下载文件
- 方式一
/**
* 压缩成ZIP 方法1
*
* @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) {
StopWatch stopWatch = new StopWatch();
stopWatch.start("toZip-1");
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(out);
File sourceFile = new File(srcDir);
compress(sourceFile, zos, sourceFile.getName(), keepDirStructure);
} catch (Exception e) {
log.error("压缩zip出错,", e);
throw new RuntimeException("压缩zip出错");
} finally {
close(zos);
}
stopWatch.stop();
log.info("toZip-1 共耗时：{}", stopWatch.getTotalTimeMillis());
}
- 方式二
/**
* 压缩成ZIP 方法2
*
* @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 RuntimeException {
StopWatch stopWatch = new StopWatch();
stopWatch.start("toZip-2");
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(out);
for (File sourceFile : srcFiles) {
byte[] buf = new byte[BUFFER_SIZE];
zos.putNextEntry(new ZipEntry(sourceFile.getName()));
int len;
FileInputStream in = new FileInputStream(sourceFile);
while ((len = in.read(buf)) != -1) {
zos.write(buf, 0, len);
}
zos.closeEntry();
in.close();
}
} catch (Exception e) {
log.error("压缩zip出错,", e);
throw new RuntimeException("压缩zip出错");
} finally {
close(zos);
}
stopWatch.stop();
log.info("toZip-2 共耗时：{}", stopWatch.getTotalTimeMillis());
}
2.解压
/**
* 解压文件
*
* @param zipFile：需要解压缩的文件
* @param descDir：解压后的目标目录
*/
public static void unZipFiles(File zipFile, String descDir) throws IOException {
File destFile = new File(descDir);
if (!destFile.exists()) {
destFile.mkdirs();
}
// 解决zip文件中有中文目录或者中文文件
ZipFile zip = new ZipFile(zipFile, Charset.forName("GBK"));
for (Enumeration entries = zip.entries(); entries.hasMoreElements(); ) {
ZipEntry entry = (ZipEntry) entries.nextElement();
InputStream in = zip.getInputStream(entry);
String curEntryName = entry.getName();
// 判断文件名路径是否存在文件夹
int endIndex = curEntryName.lastIndexOf('/');
// 替换
String outPath = (descDir + curEntryName).replaceAll("\\*", "/");
if (endIndex != -1) {
File file = new File(outPath.substring(0, outPath.lastIndexOf("/")));
if (!file.exists()) {
file.mkdirs();
}
}
// 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压
File outFile = new File(outPath);
if (outFile.isDirectory()) {
continue;
}
OutputStream out = new FileOutputStream(outPath);
byte[] buf1 = new byte[1024];
int len;
while ((len = in.read(buf1)) > 0) {
out.write(buf1, 0, len);
}
in.close();
out.close();
}
log.info("解压{}成功", zipFile.getName());
}
3. 测试
package com.common.util.zip.controller; import com.common.util.zip.ZipUtils; import lombok.extern.slf4j.Slf4j; import org.apache.commons.lang3.StringUtils; import org.apache.shiro.util.Assert; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.IOException; import java.net.URLEncoder; import java.time.LocalDateTime; import java.time.format.DateTimeFormatter; import java.util.Arrays; import java.util.List; /** * @author * @Describe 功能描述 * @date */ @RestController @Slf4j(topic = "ZipController") public class ZipController { String srcDir = "C:\\Users\\kinson\\Desktop\\zipTest"; String desDir = "C:\\Users\\kinson\\Desktop\\unzip\\"; String desZipFilename = "C:\\Users\\kinson\\Desktop\\zipTest\\dest.zip"; String desZipFilePath = "C:\\Users\\kinson\\Desktop\\"; @RequestMapping(value = "toZip") public void toZip(HttpServletRequest request, HttpServletResponse response, String type) throws IOException { if (StringUtils.isEmpty(type)) { // 浏览器响应返回 response.reset(); // 设置response的header，response为HttpServletResponse接收输出流 response.setContentType("application/zip"); String zipFileName = "zipFile-" + LocalDateTime.now().format(DateTimeFormatter.ofPattern( "yyyyMMddHHmmss")) + ".zip"; response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(zipFileName, "UTF-8" )); ZipUtils.toZip(srcDir, response.getOutputStream(), true); } else if (StringUtils.equals(type, "2")) { // 浏览器响应返回2 File file = new File(srcDir); if (file.isDirectory() && file.listFiles().length > 0) { File[] files = file.listFiles(); List<File> fileList = Arrays.asList(files); response.reset(); // 设置response的header，response为HttpServletResponse接收输出流 response.setContentType("application/zip"); String zipFileName = "zipFile2-" + LocalDateTime.now().format(DateTimeFormatter.ofPattern( "yyyyMMddHHmmss")) + ".zip"; response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(zipFileName, "UTF-8" )); ZipUtils.toZip(fileList, response.getOutputStream()); } } else if (StringUtils.equals(type, "3")) { // 指定目录 File file = new File(srcDir); File desZipFile = new File(desZipFilename); if (file.isDirectory() && file.listFiles().length > 0) { File[] files = file.listFiles(); ZipUtils.toZip(files, desZipFile); } } else { log.info("type is {}", type); } } @RequestMapping(value = "unZip") public void unZip(String zipFilename) throws IOException { Assert.isTrue(StringUtils.isNotEmpty(StringUtils.trim(zipFilename))); File file = new File(desZipFilePath + zipFilename + ".zip"); ZipUtils.unZipFiles(file, desDir); } }
