http請求內容壓縮學習筆記

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.zip.GZIPOutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//壓縮
public class Dmo1 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String data = "bbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
        System.out.println("壓縮前" + data.length());

        // 以下代碼完成將String類型壓縮到byte[]中
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        GZIPOutputStream gout = new GZIPOutputStream(bout);
        gout.write(data.getBytes());
        gout.flush();
        gout.close();

        // 取出壓縮後的數據
        byte[] buf = bout.toByteArray();
        System.out.println("壓縮後" + buf.length);

        // 將壓縮後的數據輸出到瀏覽器
        response.setHeader("content-encoding", "gzip");
        response.setHeader("content-length", buf.length + "");

        // 服務端以字節方式輸出
        response.getOutputStream().write(buf);

    }

}

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