lz4压缩解压缩

kafka对lz4进行了重新封装

1. maven引入
   

        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>0.8.2.2</version>
        </dependency>

    2. 代码

    /**
     * 压缩
     * @param data
     * @return
     * @throws IOException 
     */
    public static String compress(String data) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintWriter out = new PrintWriter(new KafkaLZ4BlockOutputStream(baos, 4));
        try {
            out.print(data);
            out.flush();
        } finally {
            if(out != null) {
                out.close();
            }
        }
        return Base64.getEncoder().encodeToString(baos.toByteArray());
    }
    
    /**
     * 解压缩
     * @param data
     * @return
     * @throws IOException
     */
    public static String deCompress(String data) throws IOException {
        byte[] source = Base64.getDecoder().decode(data);
        ByteArrayInputStream bais = new ByteArrayInputStream(source);
        BufferedReader br = new BufferedReader(new InputStreamReader(new KafkaLZ4BlockInputStream(bais)));
        StringBuffer sb = new StringBuffer();
        String str = null;
        try {
            while((str = br.readLine()) != null) {
                sb.append(str);
            }
        } finally {
            if(br != null) {
                br.close();
            }
        }
        return sb.toString();
    }