java代理使用 apache ant实现文件压缩/解压缩

【背景】

近日在研究web邮件下载功能，下载的邮件能够导入foxmail邮件client。可是批量下载邮件还需将邮件打成一个压缩包。

从网上搜索通过java实现文件压缩、解压缩有非常多现成的样例。

【參考代码】（须要下载apache ant.jar包）

import java.io.File;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Expand;
import org.apache.tools.ant.taskdefs.Zip;
import org.apache.tools.ant.types.FileSet;

public class Zipper {
public final static String encoding = "GBK";

// 压缩
public static void zip(String srcPathname, String zipFilepath)
throws BuildException, RuntimeException {
File file = new File(srcPathname);
if (!file.exists())
throw new RuntimeException("source file or directory "
+ srcPathname + " does not exist.");

Project proj = new Project();
FileSet fileSet = new FileSet();
fileSet.setProject(proj);
// 推断是文件夹还是文件
if (file.isDirectory()) {
fileSet.setDir(file);
// ant中include/exclude规则在此都能够使用
// 比方:
// fileSet.setExcludes("**/*.txt");
// fileSet.setIncludes("**/*.xls");
} else {
fileSet.setFile(file);
}

Zip zip = new Zip();
zip.setProject(proj);
zip.setDestFile(new File(zipFilepath));
zip.addFileset(fileSet);
zip.setEncoding(encoding);
zip.execute();
}

// 解压缩
public static void unzip(String zipFilepath, String destDir)
throws BuildException, RuntimeException {
if (!new File(zipFilepath).exists())
throw new RuntimeException("zip file " + zipFilepath
+ " does not exist.");

Project proj = new Project();
Expand expand = new Expand();
expand.setProject(proj);
expand.setTaskType("unzip");
expand.setTaskName("unzip");
expand.setEncoding(encoding);

expand.setSrc(new File(zipFilepath));
expand.setDest(new File(destDir));
expand.execute();
}
}