java中解压乱码解决方法

第一种使用ant实现的zip解压缩，其中解压的乱码注意使用

public void unZip(String unZipFileName,String outputPath) 其中

this.zipFile = new ZipFile(unZipFileName, "GB18030");是解决中文名乱码的关键。

import java.io.*;
import org.apache.tools.zip.*;
import java.util.Enumeration;
 

public class AntZip {
	private ZipFile zipFile;
	private ZipOutputStream zipOut; // 压缩Zip
	private ZipEntry zipEntry;
	private static int bufSize; // size of bytes
	private byte[] buf;
	private int readedBytes;
	// 用于压缩中。要去除的绝对父路路径，目的是将绝对路径变成相对路径。
	private String deleteAbsoluteParent;
 
	
	public AntZip() {
		this(512);
	}
 
	
	public AntZip(int bufSize) {
		this.bufSize = bufSize;
		this.buf = new byte[this.bufSize];
		deleteAbsoluteParent = null;
	}
 
	
	public void doZip(String zipDirectory) {
		File zipDir = new File(zipDirectory);
		doZip(new File[] { zipDir }, zipDir.getName());
	}
 
	
	public void doZip(File[] files, String zipFileName) {
		// 未指定压缩文件名，默认为"ZipFile"
		if (zipFileName == null || zipFileName.equals(""))
			zipFileName = "ZipFile";
 
		// 添加".zip"后缀
		if (!zipFileName.endsWith(".zip"))
			zipFileName += ".zip";
 
		try {
			this.zipOut = new ZipOutputStream(new BufferedOutputStream(
					new FileOutputStream(zipFileName)));
			compressFiles(files, this.zipOut, true);
			this.zipOut.close();
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}
	}
 
	
	private void compressFiles(File[] files, ZipOutputStream zipOut,
			boolean isAbsolute) throws IOException {
 
		for (File file : files) {
			if (file == null)
				continue; // 空的文件对象
 
			// 删除绝对父路径
			if (file.isAbsolute()) {
				if (isAbsolute) {
					deleteAbsoluteParent = file.getParentFile()
							.getAbsolutePath();
					deleteAbsoluteParent = appendSeparator(deleteAbsoluteParent);
				}
			} else
				deleteAbsoluteParent = "";
 
			if (file.isDirectory()) {// 是目录
				compressFolder(file, zipOut);
			} else {// 是文件
				compressFile(file, zipOut);
			}
		}
	}
 
	
	public void compressFile(File file, ZipOutputStream zipOut)
			throws IOException {
 
		String fileName = file.toString();
 
		
		if (file.isAbsolute())
			fileName = fileName.substring(deleteAbsoluteParent.length());
		if (fileName == null || fileName == "")
			return;
 
		
		if (file.isDirectory())
			fileName = fileName + "/";// 此处不能用"\"
 
		zipOut.putNextEntry(new ZipEntry(fileName));
 
		// 如果是文件则需读;如果是空目录则无需读，直接转到zipOut.closeEntry()。
		if (file.isFile()) {
			FileInputStream fileIn = new FileInputStream(file);
			while ((this.readedBytes = fileIn.read(this.buf)) > 0) {
				zipOut.write(this.buf, 0, this.readedBytes);
			}
			fileIn.close();
		}
 
		zipOut.closeEntry();
	}
 
	
	private void compressFolder(File dir, ZipOutputStream zipOut)
			throws IOException {
 
		File[] files = dir.listFiles();
 
		if (files.length == 0)// 如果目录为空，则单独压缩空目录。
			compressFile(dir, zipOut);
		else
			// 如果目录不为空,则分别处理目录和文件.
			compressFiles(files, zipOut, false);
	}
 
	
	public void unZip(String unZipFileName) {
		FileOutputStream fileOut;
		File file;
		InputStream inputStream;
 
		try {
			this.zipFile = new ZipFile(unZipFileName);
 
			for (Enumeration entries = this.zipFile.getEntries(); entries
					.hasMoreElements();) {
 
				ZipEntry entry = (ZipEntry) entries.nextElement();
				file = new File(entry.getName());
 
				if (entry.isDirectory()) {// 是目录，则创建之
					file.mkdirs();
				} else {// 是文件
					// 如果指定文件的父目录不存在,则创建之.
					File parent = file.getParentFile();
					if (parent != null && !parent.exists()) {
						parent.mkdirs();
					}
 
					inputStream = zipFile.getInputStream(entry);
 
					fileOut = new FileOutputStream(file);
					while ((this.readedBytes = inputStream.read(this.buf)) > 0) {
						fileOut.write(this.buf, 0, this.readedBytes);
					}
					fileOut.close();
 
					inputStream.close();
				}
			}
			this.zipFile.close();
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}
	}
	
	public void unZip(String unZipFileName,String outputPath) {
		FileOutputStream fileOut;
		File file;
		InputStream inputStream;
 
		try {
			this.zipFile = new ZipFile(unZipFileName, "GB18030");
 
			for (Enumeration entries = this.zipFile.getEntries(); entries
					.hasMoreElements();) {
 
				ZipEntry entry = (ZipEntry) entries.nextElement();
				file = new File(outputPath+entry.getName());
 
				if (entry.isDirectory()) {// 是目录，则创建之
					file.mkdirs();
				} else {// 是文件
					// 如果指定文件的父目录不存在,则创建之.
					File parent = file.getParentFile();
					if (parent != null && !parent.exists()) {
						parent.mkdirs();
					}
 
					inputStream = zipFile.getInputStream(entry);
 
					fileOut = new FileOutputStream(file);
					while ((this.readedBytes = inputStream.read(this.buf)) > 0) {
						fileOut.write(this.buf, 0, this.readedBytes);
					}
					fileOut.close();
 
					inputStream.close();
				}
			}
			this.zipFile.close();
		} catch (ioException ioe) {
			ioe.printStackTrace();
		}
	}
 
	
	private String appendSeparator(String path) {
		if (!path.endsWith(File.separator))
			path += File.separator;
		return path;
	}
 
	
	public void unZip(File unZipFile) {
		unZip(unZipFile.toString());
	}
 
	
	public void setBufSize(int bufSize) {
		this.bufSize = bufSize;
	}
	// 主函数，用于测试AntZip类
	
 
}

第二种 从修改ZipInputStream及ZipOutputStream对於档名的编码方式来着手了。

我们可以从jdk的src.zip取得ZipInputStream及ZipOutputStream的原始码来加以修改：

一、ZipOutputStream.java

从jdk的src.zip取得ZipOutputStream.java原始码，另存新档存到c:/java/util/zip这个资料夹里，档名改为CZipOutputStream.java。

开始修改原始码，将class名称改为CZipOutputStream

建构式也必须更改为CZipOutputStream

新增member，这个member记录编码方式

private String encoding="UTF-8";

再新增一个建构式(这个建构式可以让这个class在new的时候，设定档名的编码)

 public CZipOutputStream(OutputStream out,String encoding) { 
     super(out, new Deflater(Deflater.DEFAULT_COMPRESSION, true)); 
     usesDefaultDeflater = true; 
     this.encoding=encoding; 
  }

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