线程“main”java.util.zip.DataFormatException 中的异常：标头检查不正确

Question

我用 Java 编写了一个应用程序，用于使用 Deflaor 和 Inflator 压缩和解压缩字符串，但是当我运行它时，我得到了以下异常：

Deflated String:x��Q�n�0��@>"C��E����3�,[
d����9��P������x�O�����hcy��L
�Ct��{~m�I:�$�%\HD+�I�
�NwG
Exception in thread "main" java.util.zip.DataFormatException: incorrect header check
    at java.util.zip.Inflater.inflateBytes(Native Method)
    at java.util.zip.Inflater.inflate(Inflater.java:223)
    at java.util.zip.Inflater.inflate(Inflater.java:240)
    at sample_ftp.Sample_ftp.main(Sample_ftp.java:70)
Java Result: 1

我的代码：

        // Encode a String into bytes
        String inputString = "Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar Tu hi bata Pehla nasha Pehla khumaar Udta hi firoon in hawaon mein kahin Ya main jhool jaoon in ghataon mein kahin Udta hi firoon in hawaon mein kahin Ya main jhool jaoon in ghataon mein kahin Ek kar doon aasmaan zameen Kaho yaaron kya karoon kya nahin Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar Tu hi bata Pehla nasha Pehla khumaar Usne baat ki kuchh aise dhang se Sapne de gaya vo hazaaron range ke Usne baat ki kuchh aise dhang se Sapne de gaya vo hazaaron range ke Reh jaoon jaise main haar ke Aur choome vo mujhe pyaar se Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar";
        byte[] input = inputString.getBytes("UTF-8");

        // Compress the bytes
        byte[] output1 = new byte[100];
        Deflater compresser = new Deflater();
        compresser.setInput(input);
        compresser.finish();
        int compressedDataLength = compresser.deflate(output1);
        compresser.end();
        System.out.println("Deflated String:"+new String(output1));

        String str=new String(output1);
        byte output2[]=str.getBytes("UTF-8");

         // Decompress the bytes
        Inflater decompresser = new Inflater();
        decompresser.setInput(output2);
        byte[] result = new byte[10000];
        int resultLength = decompresser.inflate(result);
        decompresser.end();

        // Decode the bytes into a String
        String outputString = new String(result, 0, resultLength, "UTF-8");
        System.out.println("Deflated String:"+outputString);

Answer 1

您的代码存在几个问题：

1) 您的假设是使用 deflator 返回的字节数组 output1 可以是没有有效编码的有效 String - 从您的代码中可以看出：

String str=new String(output1);
byte output2[]=str.getBytes("UTF-8");

相反，不要不必要地转换 bye 数组表示，而是按原样直接传递：decompresser.setInput(output1)

编辑：根据 cmets 中的新要求进行了更改

2) 您正在为您的inflate 设置一个空白字节数组，这也会导致一个空白字符串（此处）：

byte[] result = new byte[10000];
int resultLength = decompresser.inflate(result);

3) 您已将压缩缓冲区大小限制为 100；我已经增加了它以容纳您的整个字符串

byte[] output1 = new byte[input.length];

您可以在此处使用从您的 String 或前一个字节数组派生的字节数组

编辑： 正如 cmets 中所指出的，要求是专门从字符串获取字节数组，从而以字符串格式表示二进制数据 Base64 编码方案将发挥作用，将代码修改为：

import org.apache.axis.encoding.Base64;

更改代码：

public static void main(String[] args) {
    try {
        // Encode a String into bytes
        String inputString = "Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar Tu hi bata Pehla nasha Pehla khumaar Udta hi firoon in hawaon mein kahin Ya main jhool jaoon in ghataon mein kahin Udta hi firoon in hawaon mein kahin Ya main jhool jaoon in ghataon mein kahin Ek kar doon aasmaan zameen Kaho yaaron kya karoon kya nahin Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar Tu hi bata Pehla nasha Pehla khumaar Usne baat ki kuchh aise dhang se Sapne de gaya vo hazaaron range ke Usne baat ki kuchh aise dhang se Sapne de gaya vo hazaaron range ke Reh jaoon jaise main haar ke Aur choome vo mujhe pyaar se Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar";
        byte[] input = inputString.getBytes("UTF-8");

        // Compress the bytes
        byte[] output1 = new byte[input.length];
        Deflater compresser = new Deflater();
        compresser.setInput(input);
        compresser.finish();
        int compressedDataLength = compresser.deflate(output1);
        compresser.end();

        String str = Base64.encode(output1);
        System.out.println("Deflated String:" + str);

        byte[] output2 = Base64.decode(str);

        // Decompress the bytes
        Inflater decompresser = new Inflater();
        decompresser.setInput(output2);
        byte[] result = str.getBytes();
        int resultLength = decompresser.inflate(result);
        decompresser.end();

        // Decode the bytes into a String
        String outputString = new String(result, 0, resultLength, "UTF-8");
        System.out.println("Deflated String:" + outputString);
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (DataFormatException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

输出：

Deflated String: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
Deflated String:Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar Tu hi bata Pehla nasha Pehla khumaar Udta hi firoon in hawaon mein kahin Ya main jhool jaoon in ghataon mein kahin Udta hi firoon in hawaon mein kahin Ya main jhool jaoon in ghataon mein kahin Ek kar doon aasmaan zameen Kaho yaaron kya karoon kya nahin Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar Tu hi bata Pehla nasha Pehla khumaar Usne baat ki kuchh aise dhang se Sapne de gaya vo hazaaron range ke Usne baat ki kuchh aise dhang se Sapne de gaya vo hazaaron range ke Reh jaoon jaise main haar ke Aur choome vo mujhe pyaar se Pehla nasha Pehla khumaar Naya pyaar hai naya intezaar Kar loon main kya apna haal Aye dil-e-bekaraar Mere dil-e-bekaraar

.....