jarutil.java

运用java开发工具

package javazip.util;

import java.util.ArrayList;
import java.io.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.JarInputStream;
import javazip.base.FileInfo;

/**
 * 实现jar文件压缩和解压缩的类
 * 
 * @author dragon
 */
public class JarUtil extends CompressUtil {

	final int BUF_SIZE = 1024 * 64;

	/**
	 * jar文件的压缩的方法
	 * 
	 * @see javazip.util.CompressUtil#compressFile(java.util.ArrayList)
	 */
	public void compressFile(ArrayList fileList, String target) {
		File[] list = new File[fileList.size()];
		for (int i = 0; i < fileList.size(); i++) {
			list[i] = (File) fileList.get(i);
		}
		JarOutputStream jos = null;
		File file = null;
		try {
			if (list == null || list.length < 1)
				return;
			file = (File) list[0];
			if (!file.exists() || !file.canRead())
				return;

			String curPath = file.getPath().substring(0,
					file.getPath().length() - file.getName().length() - 1);
			jos = new JarOutputStream(new FileOutputStream(target)); // overwrite

			for (int i = 0; i < list.length; i++)
				if (!jarDir(jos, curPath, ((File) list[i]).toString()))
					return;
			jos.close();
			return;
		} catch (Exception e) {
			return;
		}
	}

	/**
	 *  
	 */
	public void compressFile(File list[], String target) {
		//		File [] list=new File[fileList.size()];
		//		for(int i=0;i<fileList.size();i++)
		//		{
		//			list[i]=(File)fileList.get(i);
		//		}
		JarOutputStream jos = null;
		File file = null;
		try {
			if (list == null || list.length < 1)
				return;
			file = (File) list[0];
			if (!file.exists() || !file.canRead())
				return;

			String curPath = file.getPath().substring(0,
					file.getPath().length() - file.getName().length() - 1);
			jos = new JarOutputStream(new FileOutputStream(target)); // overwrite

			for (int i = 0; i < list.length; i++)
				if (!jarDir(jos, curPath, ((File) list[i]).toString()))
					return;
			jos.close();
			return;
		} catch (Exception e) {
			return;
		}
	}

	/**
	 * 
	 * @param jos
	 * @param curPath
	 * @param srcDir
	 * @return
	 */
	private boolean jarDir(JarOutputStream jos, String curPath, String srcDir) {
		try {
			File file = new File(srcDir);
			File[] files = file.listFiles();
			if (files == null) {
				if (!file.isDirectory())
					doJar(jos, curPath, file.getPath());
			} else
				for (int i = 0; i < files.length; i++) {
					if (files[i].isDirectory()
							&& !files[i].getName().equals(".")
							&& !files[i].getName().equals(".."))
						jarDir(jos, curPath, files[i].getPath());
					else
						doJar(jos, curPath, files[i].getPath());
				}
			return true;
		} catch (Exception e) {
			return false;
		}
	}

	/**
	 * 
	 * @param jos
	 * @param curPath
	 * @param fullFileName
	 * @return
	 */
	private boolean doJar(JarOutputStream jos, String curPath,
			String fullFileName) {
		try {
			File file = new File(fullFileName);
			if (!file.isDirectory()) {

				jos.putNextEntry(new ZipEntry(new String(fullFileName
						.substring(curPath.length()))));
				FileInputStream fis = new FileInputStream(file);
				int readSize = 0;
				byte[] buf = new byte[BUF_SIZE];
				while ((readSize = fis.read(buf, 0, BUF_SIZE)) > 0) {
					jos.write(buf, 0, readSize);
				}
				fis.close();
				fis = null;
			}

			jos.flush();
			return true;
		} catch (Exception e) {
			return false;
		}
	}

	/**
	 * jar文件解压缩的方法(还有点问题)
	 * 
	 * @see javazip.util.CompressUtil#extractFile(java.lang.String)
	 */
	public void extractFile(String source, String target) {
		/*
		 * try { FileInputStream fis = new FileInputStream(source);
		 * JarInputStream jis = new JarInputStream(fis); ZipEntry ze = null;
		 * 
		 * File file = new File(target); if (!target.endsWith("\\")) target =
		 * target.concat("\\");
		 * 
		 * if (!file.exists() && !file.mkdir()) { System.out.println("Cannot
		 * make dir."); }
		 * 
		 * FileOutputStream fos = null; byte[] buf = new byte[BUF_SIZE]; int
		 * readSize = 0; File dir = null; String dirName; while ((ze =
		 * jis.getNextJarEntry()) != null) { dirName = target + ze.getName();
		 * file = new File(target + ze.getName()); System.out.println(target +
		 * ze.getName()); dirName = dirName.substring(0, dirName.length() -
		 * file.getName().length() - 1); System.out.println(dirName); dir = new
		 * File(dirName); if (!dir.exists() && !dir.mkdirs()) {
		 * System.out.println("Cannot make dir."); return; }
		 * 
		 * if (ze.isDirectory()) { System.out.println("*** DIR ***"); if
		 * (!file.mkdir()) return; } else { file.createNewFile(); fos = new
		 * FileOutputStream(file); while ((readSize = jis.read(buf, 0,
		 * BUF_SIZE)) > 0) fos.write(buf, 0, readSize); fos.close(); } }
		 * 
		 * jis.close(); fis.close(); return; } catch (Exception e) { return; }
		 */

		JarInputStream in = null;
		BufferedOutputStream out = null;
		File targetFile = new File(target);
		int count = 0;
		try {
			in = new JarInputStream(new BufferedInputStream(
					new FileInputStream(source)));
			JarEntry jarEntry;
			while ((jarEntry = in.getNextJarEntry()) != null) {
				//debug begin{
				System.out.println("\n\njarEntry.getName()="
						+ jarEntry.getName());
				//}debug end
				String jarEntryName = jarEntry.getName();
				//将ZipEntry中的标准分割符'/'换成本机分隔符
				jarEntryName = jarEntryName.replace('/', '\\');
				if (jarEntryName.endsWith("\\")) //以'\'结尾说明是文件夹
				{
					continue;
				}
				File outputFile = new File(targetFile.getAbsolutePath() + "\\"
						+ jarEntryName.substring(jarEntryName.indexOf("\\")));
				System.out.println("outputFile.getAbsolutePath()="
						+ outputFile.getAbsolutePath());
				if (!outputFile.exists()) {
					new File(outputFile.getParent()).mkdirs();
				}
				out = new BufferedOutputStream(new FileOutputStream(outputFile));
				int data;
				while ((data = in.read()) != -1) {
					out.write(data);
				}
				out.close();
			}
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
			//            JOptionPane.showMessageDialog(null,e.toString());
		}
	}

	/**
	 *  
	 */
	public Long getOriginalLength(File f) {
		long result = 0;
		try {
			ZipEntry zipEntry = null;
			JarInputStream zis = new JarInputStream(new FileInputStream(f));
			if (!f.exists()) {
				return null;
			} else {
				while ((zipEntry = zis.getNextEntry()) != null) {
					result += zipEntry.getSize();
				}
			}
		} catch (Exception e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
		return new Long(result);
	}

	/**
	 *  
	 */
	public boolean testFile(File f) {
		int count = 0;
		try {
			ZipEntry zipEntry = null;
			JarInputStream zis = new JarInputStream(new FileInputStream(f));
			if (!f.exists()) {
				return false;
			} else {
				while ((zipEntry = zis.getNextEntry()) != null) {
					count++;
				}
			}
		} catch (Exception e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
		if (count > 0)
			return true;
		else
			return false;
	}

	public static void main(String args[]) {
		JarUtil u = new JarUtil();
		System.out.println(u.testFile(new File("F:\\dt.jar")));

	}
}