不打开一个ZipEntry那么就会出现这个错误 : ZipOutputStream ZIP file must have at least one entry
这个ZipEntry的意思是Zip压缩包中的某个文件名字，当打开这个Entry时，就相当于往这个文件读取或者写入内容。
结束后用closeEtnry关闭该文件。
而GZIPInputStream则没有Entry这个概念，直接读写就行。

[java] view plaincopy
ZipOutputStream zip = new ZipOutputStream (new FileOutputStream("./data.zip"));
DataOutputStream out = new DataOutputStream(zip);

zip.putNextEntry(new ZipEntry("1.txt"));

out.writeByte('c');
out.writeUTF("fafaafd");
zip.closeEntry();
out.close();

ZipInputStream zipin = new ZipInputStream( new FileInputStream("./data.zip"));
DataInputStream in = new DataInputStream(zipin);

zipin.getNextEntry();
zipin.

System.out.println( in.readByte() );
System.out.println( in .readUTF());