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场景

使用ZipEntry解压zip文件报错:  java.lang.IllegalArgumentException: MALFORMED  

分析

压缩文件中含有中文, 在ZipCoder调用toString函数报错。此处识别成了utf8,
所以 在解压时设置成gbk字符集就行了

String toString(byte[] ba, int length) {
        CharsetDecoder cd = decoder().reset();
        int len = (int)(length * cd.maxCharsPerByte());
        char[] ca = new char[len];
        if (len == 0)
            return new String(ca);
        // UTF-8 only for now. Other ArrayDeocder only handles
        // CodingErrorAction.REPLACE mode. ZipCoder uses
        // REPORT mode.
        // 这里是报错位置
        if (isUTF8 && cd instanceof ArrayDecoder) {
            int clen = ((ArrayDecoder)cd).decode(ba, 0, length, ca);
            if (clen == -1)    // malformed
                throw new IllegalArgumentException("MALFORMED");
            return new String(ca, 0, clen);
        }
        ByteBuffer bb = ByteBuffer.wrap(ba, 0, length);
        CharBuffer cb = CharBuffer.wrap(ca);
        CoderResult cr = cd.decode(bb, cb, true);
        if (!cr.isUnderflow())
            throw new IllegalArgumentException(cr.toString());
        cr = cd.flush(cb);
        if (!cr.isUnderflow())
            throw new IllegalArgumentException(cr.toString());
        return new String(ca, 0, cb.position());
    }

解决

ZipFile zf = new ZipFile(file, Charset.forName(“gbk”));

    /**
     * 解压文件
     * */
    @Override
    public void unZip(String srcPath, String dest) throws IOException {

        File file = new File(srcPath);
        if (!file.exists()) {
            throw new RuntimeException(srcPath + "所指文件不存在");
        }
        ZipFile zf = new ZipFile(file, Charset.forName("gbk"));
        Enumeration entries = zf.entries();
        ZipEntry entry = null;
        while (entries.hasMoreElements()) {
            entry = (ZipEntry) entries.nextElement();
            System.out.println("解压" + entry.getName());
            if (entry.isDirectory()) {
                String dirPath = dest + File.separator + entry.getName();
                Path path = Paths.get(dirPath);
                Files.createDirectories(path);

            } else {
                // 表示文件
                File f = new File(dest + File.separator + entry.getName());
                if (!f.exists()) {
                    String dirs = f.getParent();
                    Path path = Paths.get(dirs);
                    Files.createDirectories(path);
                }
                f.createNewFile();
                // 将压缩文件内容写入到这个文件中
                InputStream is = zf.getInputStream(entry);
                FileOutputStream fos = new FileOutputStream(f);
                int count;
                byte[] buf = new byte[8192];
                while ((count = is.read(buf)) != -1) {
                    fos.write(buf, 0, count);
                }
                is.close();
                fos.close();
            }
        }
    }