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1
9 package com.sslexplorer.core.filters;
10
11 import java.io.ByteArrayOutputStream  ;
12 import java.io.IOException ;
13 import java.util.zip.GZIPOutputStream ;
14
15 import javax.servlet.ServletOutputStream ;
16 import javax.servlet.http.HttpServletResponse ;
17
18 public class GZIPResponseStream extends ServletOutputStream {
19 protected ByteArrayOutputStream baos = null;
20 protected GZIPOutputStream gzipstream = null;
21 protected boolean closed = false;
22 protected HttpServletResponse response = null;
23 protected ServletOutputStream output = null;
24
25 public GZIPResponseStream(HttpServletResponse response) throws IOException {
26 super();
27 closed = false;
28 this.response = response;
29 this.output = response.getOutputStream();
30 baos = new ByteArrayOutputStream ();
31 gzipstream = new GZIPOutputStream (baos);
32 }
33
34 public void close() throws IOException {
35 if (closed) {
36 throw new IOException ("This output stream has already been closed");
37 }
38 gzipstream.finish();
39
40 byte[] bytes = baos.toByteArray();
41
42
43 response.setHeader("Content-Length",
44 Integer.toString(bytes.length));
45 response.setHeader("Content-Encoding", "gzip");
46 output.write(bytes);
47 output.flush();
48 output.close();
49 closed = true;
50 }
51
52 public void flush() throws IOException {
53 if (closed) {
54 throw new IOException ("Cannot flush a closed output stream");
55 }
56 gzipstream.flush();
57 }
58
59 public void write(int b) throws IOException {
60 if (closed) {
61 throw new IOException ("Cannot write to a closed output stream");
62 }
63 gzipstream.write((byte)b);
64 }
65
66 public void write(byte b[]) throws IOException {
67 write(b, 0, b.length);
68 }
69
70 public void write(byte b[], int off, int len) throws IOException {
71 if (closed) {
72 throw new IOException ("Cannot write to a closed output stream");
73 }
74 gzipstream.write(b, off, len);
75 }
76
77 public boolean closed() {
78 return (this.closed);
79 }
80
81 public void reset() {
82 }
84 }
85 |
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