通过gzip对字符串压缩

通过GZIPOutputStream,GZIPInputStream可以方便的对数据进行压缩，本以为很简单的代码，写好运行居然报错：

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Exception in thread "main" java.io.EOFException: Unexpected end of ZLIB input stream
??? at java.util.zip.InflaterInputStream.fill(InflaterInputStream.java:223)
??? at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:141)
??? at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:92)
??? at java.io.FilterInputStream.read(FilterInputStream.java:90)
??? at Main.main(Main.java:25)

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代码很简单：

        ByteArrayOutputStream out = new ByteArrayOutputStream();        GZIPOutputStream gzip = new GZIPOutputStream(out);        gzip.write("testlalala2389223423sdfds383274llalall".getBytes());        byte[] data = out.toByteArray();        GZIPInputStream gunzip = new GZIPInputStream(new ByteArrayInputStream(data));        data = new byte[gunzip.available()];        gunzip.read(data);

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打点分析：

?System.out.println("data_length "+data.length);

?System.out.println("data_available "+gunzip.available());

data_length 10
data_available 1

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原因：

1.没有 gzip.close();

2. gunzip.available()不能获取正确的数据，改成while

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完整的代码：

import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;public class Main {    public static void main(String[] args) throws Exception {        ByteArrayOutputStream out = new ByteArrayOutputStream();        GZIPOutputStream gzip = new GZIPOutputStream(out);        gzip.write("testlalala23892234分四是23sdfds383274llalall".getBytes("utf-8"));        gzip.close();        byte[] data = out.toByteArray();        System.out.println("data_length " + data.length);        GZIPInputStream gunzip = new GZIPInputStream(new ByteArrayInputStream(data));        System.out.println("data_available " + gunzip.available());        ByteArrayOutputStream outStream = new ByteArrayOutputStream();        byte[] buffer = new byte[256];        int n;        while ((n = gunzip.read(buffer)) >= 0) {            outStream.write(buffer, 0, n);        }        System.out.println(outStream.toString("utf-8"));    }}