javascript deflate 和 java.util.zip.Deflater 之间有什么区别

发布于 2024-12-31 22:05:26 字数 1710 浏览 0 评论 0原文

我写了一些 JavaScript 代码。使用base64和deflate进行压缩

function base64 (str) {
    return new Buffer(str).toString("base64");
}

function deflate (str) {
    return RawDeflate.deflate(str);
}

function encode (str) {
    return base64(deflate(str));
}
var str = "hello, world";
console.log("Test Encode");
console.log(encode(str));

我将“hello，world”转换为2f8d48710d6e4229b032397b2492f0c2

，我想在java中解压缩这个字符串（2f8d48710d6e4229b032397b2492f0c2）

我将str放入一个文件中，然后：

public static String decompress1951(final String theFilePath) {
    byte[] buffer = null;

    try {
        String ret = "";
        System.out.println("can come to ret");

        InputStream in = new InflaterInputStream(new Base64InputStream(new FileInputStream(theFilePath)), new Inflater(true));
        System.out.println("can come to in");
        while (in.available() != 0) {
            buffer = new byte[20480];
*****line 64 excep happen            int len = in.read(buffer, 0, 20480);
            if (len <=0) {
                break;
            }
            ret = ret + new String(buffer, 0, len);
        }
        in.close();
        return ret;

    } catch (IOException e) {
        System.out.println("Has IOException");
        System.out.println(e.getMessage());

        e.printStackTrace();
    }
    return "";
}

但我有一个例外：

java.util.zip.ZipException: invalid stored block lengths
    at java.util.zip.InflaterInputStream.read(Unknown Source)
    at com.cnzz.mobile.datacollector.DecompressDeflate.decompress1951(DecompressDeflate.java:64)
    at com.cnzz.mobile.datacollector.DecompressDeflate.main(DecompressDeflate.java:128)

原文

I wrote some Javascript code.
compress with base64 and deflate

function base64 (str) {
    return new Buffer(str).toString("base64");
}

function deflate (str) {
    return RawDeflate.deflate(str);
}

function encode (str) {
    return base64(deflate(str));
}
var str = "hello, world";
console.log("Test Encode");
console.log(encode(str));

I converted "hello, world" to 2f8d48710d6e4229b032397b2492f0c2

and I want to decompress this string(2f8d48710d6e4229b032397b2492f0c2) in java

I put the str in a file, then:

public static String decompress1951(final String theFilePath) {
    byte[] buffer = null;

    try {
        String ret = "";
        System.out.println("can come to ret");

        InputStream in = new InflaterInputStream(new Base64InputStream(new FileInputStream(theFilePath)), new Inflater(true));
        System.out.println("can come to in");
        while (in.available() != 0) {
            buffer = new byte[20480];
*****line 64 excep happen            int len = in.read(buffer, 0, 20480);
            if (len <=0) {
                break;
            }
            ret = ret + new String(buffer, 0, len);
        }
        in.close();
        return ret;

    } catch (IOException e) {
        System.out.println("Has IOException");
        System.out.println(e.getMessage());

        e.printStackTrace();
    }
    return "";
}

But I have an exception:

java.util.zip.ZipException: invalid stored block lengths
    at java.util.zip.InflaterInputStream.read(Unknown Source)
    at com.cnzz.mobile.datacollector.DecompressDeflate.decompress1951(DecompressDeflate.java:64)
    at com.cnzz.mobile.datacollector.DecompressDeflate.main(DecompressDeflate.java:128)

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狂之美人 2025-01-07 22:05:26

上面的java代码运行得很好。正如评论中所述，您以某种方式得到了错误的编码值。我使用 javascript 值获得的编码值是 y0jNycnXUSjPL8pJAQA=

然后，当您将此值复制到文件并调用 decompress1951 时，您实际上会返回 hello， world 根据需要。不知道在 javascript 部分该说什么，因为您使用的代码似乎与分发网页上的示例很好地同步。我注意到有原始和分叉所以也许那里有些混乱？无论如何，有这个 jsfiddle 如果你想看一下，我认为它可以被视为一个工作版本在那一个。