Question

您好我是java的新手，并且我尝试使用Deflater中的java.util.zip压缩字节流。我按照Oracle site中的示例。

try {
         // Encode a String into bytes
         String inputString = "blahblahblah";
         byte[] input = inputString.getBytes("UTF-8");

         // Compress the bytes
         byte[] output = new byte[100];
         Deflater compresser = new Deflater();

         compresser.setInput(input);
         compresser.finish();
         int compressedDataLength = compresser.deflate(output);
         compresser.end();

         // Decompress the bytes
         Inflater decompresser = new Inflater();
         decompresser.setInput(output, 0, compressedDataLength);
         byte[] result = new byte[100];
         int resultLength = decompresser.inflate(result);
         decompresser.end();

         // Decode the bytes into a String
         String outputString = new String(result, 0, resultLength, "UTF-8");
     } catch(java.io.UnsupportedEncodingException ex) {
         // handle
     } catch (java.util.zip.DataFormatException ex) {
         // handle
     }

当我运行此代码时，它给出了一个错误，指出setInput()，finish()，deflate()和end()未定义。这是错误消息

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
The method setInput(byte[]) is undefined for the type Deflater
The method finish() is undefined for the type Deflater
The method deflate(byte[]) is undefined for the type Deflater
The method end() is undefined for the type Deflater

at Deflater.main(Deflater.java:16)

我导入java.util.zip并查看了Oracle网站上的文档。它说这些方法存在。

无法找出问题所在。有人可以帮忙。

Answer 1

问题是你正在调用主类Deflater，这对编译器来说是不明确的。有两个具有相同名称的类，您的类和Zip Deflater。您应该将此行：Deflater compresser = new Deflater();更改为此java.util.zip.Deflater compresser = new java.util.zip.Deflater();，或者只需更改主要类的名称。

如何在java.util.zip中使用Deflater

1 个答案: