Android Gzip压缩和解压缩文件

   为了节省流量用到了Gzip压缩文件。

 参考此链接中的代码https://gist.github.com/ansjsun/5791394

importjava.io.ByteArrayInputStream;

	import java.io.ByteArrayOutputStream;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.util.zip.GZIPInputStream;
	import java.util.zip.GZIPOutputStream;
	public class StringZip {
	public static void main(String[] args) throws Exception {
	StringBuilder value = new StringBuilder() ;
	for (int i=0; i< 100; i++) {
	value.append("java gzip 压缩测试");
	}
	//字符串压缩为byte数组
	byte[] values = value.toString().getBytes() ;
	System.out.println("解压前大小"+values.length);
	values = compress(values) ;
	System.out.println("解压后大小"+values.length);
	//把压缩后的byte数组转为字符串
	String str = new String(values,"iso8859-1") ;
	//传输字符串
	System.out.println(str);
	//将接受到的字符串转换为byte数组
	values = str.getBytes("iso8859-1") ;
	//解压缩这个byte数组
	values = decompress(values) ;
	System.out.println(newString(values,"utf-8"));
	}
	/**
	* 数据解压缩
	*
	* @param data
	* @return
	* @throws Exception
	*/
	public static byte[] decompress(byte[] data) throws Exception {
	ByteArrayInputStream bais = new ByteArrayInputStream(data);
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	// 解压缩
	decompress(bais, baos);
	data = baos.toByteArray();
	baos.flush();
	baos.close();
	bais.close();
	return data;
	}
	/**
	* 数据解压缩
	*
	* @param is
	* @param os
	* @throws Exception
	*/
	public static void decompress(InputStream is, OutputStream os)
	throws Exception {
	GZIPInputStream gis = new GZIPInputStream(is);
	int count;
	byte data[] = new byte[BUFFER];
	while ((count = gis.read(data, 0, BUFFER)) != -1) {
	os.write(data, 0, count);
	}
	gis.close();
	}
	public static byte[] compress(byte[] data) throws Exception {
	ByteArrayInputStream bais = new ByteArrayInputStream(data);
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	// 压缩
	compress(bais, baos);
	byte[] output = baos.toByteArray();
	baos.flush();
	baos.close();
	bais.close();
	return output;
	}
	static final int BUFFER = 10240 ;
	/**
	* 数据压缩
	*
	* @param is
	* @param os
	* @throws Exception
	*/
	public static void compress(InputStream is, OutputStream os)
	throws Exception {
	GZIPOutputStream gos = new GZIPOutputStream(os);
	int count;
	byte data[] = new byte[BUFFER];
	while ((count = is.read(data, 0, BUFFER)) != -1) {
	gos.write(data, 0, count);
	}
	gos.finish();
	gos.flush();
	gos.close();
	}
	}

以下是我的部分代码片段 函数中压缩了一个 xml文件，

public void sendmessage2() {
    try {
       OutputStream out =  socket.getOutputStream();
        StringBuilder xml = new StringBuilder();
        xml.append("\"1.0\" encoding=\"UTF-8\"?>");
        xml.append("\"0\" Cmd=\"1\" Cla=\"17\" Name=\"js6\">");
        xml.append("\"123456\" Para=\"js4\"/>\n");
        xml.append("");

        //字符串压缩为byte数组
        byte[] values ;
        values = compress(xml.toString().getBytes("utf-8")) ;
        //传输字符串
       out.write(values);


        Message m = new Message();
        m.what = 1;
        handler.sendMessage(m);
    } catch (Exception e) {
        e.printStackTrace();
        Message m = new Message();
        m.what = 2;
        handler.sendMessage(m);
    }
}

//解压代码

public void receievmessage(){
    try{
        while(true){
            DataInputStream input = new DataInputStream(socket.getInputStream());
            byte[] buffer;
            //读取input中没有读取的字节
            buffer = new byte[input.available()];
            int len;
            if(buffer.length != 0){
                System.out.println("获取到字节");
                GZIPInputStream gzip =new GZIPInputStream(input);
                        // 读取缓冲区
                len= gzip.read(buffer);
                System.out.println("接收的长度: "+len);
                char[] tChars=new char[300];
                for(int i=0;ichar)buffer[i];  }
                StringBuffer  tStringBuf=new StringBuffer ();
                tStringBuf.append(tChars);

                System.out.println("接收的内容是: "+ tStringBuf);
               // System.out.println("接收的长度: "+buffer);
               // String msg = new String(buffer, "utf-8");//注意转码，不然中文会乱码。
              //  Message m = new Message();
              //  m.what = 3;
              //  m.obj = msg;
                //handler.sendMessage(m);
            }
        }

    }catch (Exception e) {
        // TODO: handle exception
        e.printStackTrace();
        Message m = new Message();
        m.what = 2;
        handler.sendMessage(m);
    }
}