java问题：一个字符串base64解码后再zip解压 把纯文本字符串用Gzip压缩再转换为Base64能有多少压缩...
\u5728java Base64\u7f16\u7801\u6570\u636e\u89e3\u7801\u95ee\u9898\uff0c\u600e\u4e48\u89e3\u51b3import sun.misc.BASE64Encoder; import sun.misc.BASE64Decoder; // \u5c06 s \u8fdb\u884c BASE64 \u7f16\u7801 public static String getBASE64(String s) { if (s == null) return null; return (new sun.misc.BASE64Encoder()).encode( s.getBytes() ); } // \u5c06 BASE64 \u7f16\u7801\u7684\u5b57\u7b26\u4e32 s \u8fdb\u884c\u89e3\u7801 public static String getFromBASE64(String s) { if (s == null) return null; BASE64Decoder decoder = new BASE64Decoder(); try { byte[] b = decoder.decodeBuffer(s); return new String(b); } catch (Exception e) { return null; } }
\u538b\u7f29\u7387\u5bf9\u4e8e\u4e0d\u540c\u7684\u538b\u7f29\u7b97\u6cd5\u800c\u8a00\u4f1a\u6709\u4e00\u5b9a\u7684\u5dee\u5f02\uff0c\u5bf9\u4e8e\u540c\u4e00\u4e2d\u538b\u7f29\u7b97\u6cd5\u5982Gzip\u53bb\u538b\u7f29\u4e0d\u540c\u6587\u4ef6\u65f6\uff0c\u538b\u7f29\u7387\u4e5f\u4e0d\u662f\u56fa\u5b9a\u7684\u8fd9\u4e2a\u5f88\u4e0d\u597d\u8bf4\u3002\u538b\u7f29\u7a0b\u5ea6\u7684\u5927\u5c0f\u4e3b\u8981\u6709\u88ab\u538b\u7f29\u6570\u636e\u4e2d\u7684\u5197\u4f59\u6570\u636e\u91cf\u6765\u51b3\u5b9a\uff0c\u5176\u6b21\u624d\u7531\u538b\u7f29\u7b97\u6cd5\u51b3\u5b9a\u3002
\u6bd4\u5982\uff0cbmp\u56fe\u7247\u4e3a\u9ed1\u767d\u7167\u65f6\uff0c\u538b\u7f29\u7387\u53ef\u8fbe\u523090%\u4ee5\u4e0a\uff08bmp\u5197\u4f59\u5927\uff0c\u672a\u538b\u7f29\uff09\uff0c\u800cjpg,gif\u7b49\u56fe\u7247\u538b\u7f29\u7387\u5219\u5f88\u5c0f\uff0c\u751a\u81f3\u51fa\u73b0\u8d1f\u6570\uff0c\u5b83\u4eec\u672c\u7701\u88ab\u538b\u7f29\u8fc7\u3002
\u5bf9\u4e8e\u6570\u636e\u7528base64\u7f16\u7801\uff0c\u8fd9\u4e2a\u4e00\u5b9a\u4f1a\u589e\u52a0\u6570\u636e\u91cf\u3002\u7cbe\u786e\u6765\u8bb2\uff0cbase64\u4f1a\u5c063Byte(\u5b57\u8282)\u8f6c\u62104Byte\uff0c\u6570\u636e\u957f\u5ea6\u4e0d\u80fd\u88ab3\u6574\u9664\u65f6\u9700\u8981\u8865\u51451\u6216\u80052\u4e2aByte,\u56e0\u6b64\u6570\u636e\u91cf\u4f1a\u589e\u5927\u3002
\u7f16\u7801\u540e = \u7f16\u7801\u524d * (4 / 3)
\u603b\u7684\u6765\u8bf4\uff1a\u538b\u7f29\u7f16\u7801\u540e = (\u6e90\u6570\u636e * \u538b\u7f29\u7387) * ( 4 / 3)
import org.apache.commons.codec.binary.Base64;
public class c {
public static void main(String[] args) throws Exception {
// String base64Str =
// "UEsDBC0AAAAIAAaPJkfS5clx//////////8JABQARW1wbG95ZWVzAQAQAM4BAAAAAAAAmgAAAAAAAACLrlZyKS2pVLJSetqz+/mU+Uo6Sp4uSlamhjpKXvmZeS6JJalAuRh9EEPD0MjCzMzEAAK0DSwMDDRj9IE6fFITy1IhSvNKc3J0lPwSc0Hanu5Z8GRHJ1BBZrFjSkpqipJVWmJOcWqtDg5Ljahh6bO5fU9nzybeUmMcllqaGJhYEGvp877uJ7um4LO0uBhmoQk1fJmWloJpWywAUEsBAjMALQAAAAgABo8mR9LlyXH//////////wkAFAAAAAAAAAAAAAAAAAAAAEVtcGxveWVlcwEAEADOAQAAAAAAAJoAAAAAAAAAUEsFBgAAAAABAAEASwAAANUAAAAAAA==";
// BASE64Decoder decoder = new BASE64Decoder();
// byte[] b = decoder.decodeBuffer(base64Str); //解码
// String result = decompressByteArrayToString(b, "UTF-8");
// System.out.println(result);
String baseString = Base64.encodeBase64String("我爱中国".getBytes("UTF-8"));
System.out.println("\"我爱中国\"的Base64编码为:" + baseString);
String base64Str = "5oiR54ix5Lit5Zu9";
byte[] bytes = Base64.decodeBase64(base64Str);
System.out.println("解码后:" + new String(bytes, "UTF-8"));
}
}
兄弟，搞定了没
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