import java.io.*; import java.util.zip.*;public class GZIPcompress { public static void main(String[] args) { try { BufferedReader in = new BufferedReader( new FileReader(args[0])); BufferedOutputStream out = new BufferedOutputStream( new GZIPOutputStream( new FileOutputStream("test.gz"))); System.out.println("Writing file"); int c; while((c = in.read()) != -1) out.write(c); in.close(); out.close(); System.out.println("Reading file"); BufferedReader in2 = new BufferedReader( new InputStreamReader( new GZIPInputStream( new FileInputStream("test.gz")))); String s; while((s = in2.readLine()) != null) System.out.println(s); } catch(Exception e) { e.printStackTrace(); } } }
public class ZipCompress { public static void main(String[] args) { try { FileOutputStream f = new FileOutputStream("test.zip"); CheckedOutputStream csum = new CheckedOutputStream( f, new Adler32()); ZipOutputStream out = new ZipOutputStream( new BufferedOutputStream(csum)); out.setComment("A test of Java Zipping"); // Can't read the above comment, though for(int i = 0; i < args.length; i++) { System.out.println( "Writing file " + args[i]); BufferedReader in = new BufferedReader( new FileReader(args[i])); out.putNextEntry(new ZipEntry(args[i])); int c; while((c = in.read()) != -1) out.write(c); in.close(); } out.close(); // Checksum valid only after the file // has been closed! System.out.println("Checksum: " + csum.getChecksum().getValue()); // Now extract the files: System.out.println("Reading file"); FileInputStream fi = new FileInputStream("test.zip"); CheckedInputStream csumi = new CheckedInputStream( fi, new Adler32()); ZipInputStream in2 = new ZipInputStream( new BufferedInputStream(csumi)); ZipEntry ze; System.out.println("Checksum: " + csumi.getChecksum().getValue()); while((ze = in2.getNextEntry()) != null) { System.out.println("Reading file " + ze); int x; while((x = in2.read()) != -1) System.out.write(x); } in2.close(); // Alternative way to open and read // zip files: ZipFile zf = new ZipFile("test.zip"); Enumeration e = zf.entries(); while(e.hasMoreElements()) { ZipEntry ze2 = (ZipEntry)e.nextElement(); System.out.println("File: " + ze2); // ... and extract the data as before } } catch(Exception e) { e.printStackTrace(); } } }
new GZIPInputStream(url.openStream()));
url.openStream()得到的数据流不是压缩过的 应该是不行的
import java.util.zip.*;public class GZIPcompress {
public static void main(String[] args) {
try {
BufferedReader in =
new BufferedReader(
new FileReader(args[0]));
BufferedOutputStream out =
new BufferedOutputStream(
new GZIPOutputStream(
new FileOutputStream("test.gz")));
System.out.println("Writing file");
int c;
while((c = in.read()) != -1)
out.write(c);
in.close();
out.close();
System.out.println("Reading file");
BufferedReader in2 =
new BufferedReader(
new InputStreamReader(
new GZIPInputStream(
new FileInputStream("test.gz"))));
String s;
while((s = in2.readLine()) != null)
System.out.println(s);
} catch(Exception e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
try {
FileOutputStream f =
new FileOutputStream("test.zip");
CheckedOutputStream csum =
new CheckedOutputStream(
f, new Adler32());
ZipOutputStream out =
new ZipOutputStream(
new BufferedOutputStream(csum));
out.setComment("A test of Java Zipping");
// Can't read the above comment, though
for(int i = 0; i < args.length; i++) {
System.out.println(
"Writing file " + args[i]);
BufferedReader in =
new BufferedReader(
new FileReader(args[i]));
out.putNextEntry(new ZipEntry(args[i]));
int c;
while((c = in.read()) != -1)
out.write(c);
in.close();
}
out.close();
// Checksum valid only after the file
// has been closed!
System.out.println("Checksum: " +
csum.getChecksum().getValue());
// Now extract the files:
System.out.println("Reading file");
FileInputStream fi =
new FileInputStream("test.zip");
CheckedInputStream csumi =
new CheckedInputStream(
fi, new Adler32());
ZipInputStream in2 =
new ZipInputStream(
new BufferedInputStream(csumi));
ZipEntry ze;
System.out.println("Checksum: " +
csumi.getChecksum().getValue());
while((ze = in2.getNextEntry()) != null) {
System.out.println("Reading file " + ze);
int x;
while((x = in2.read()) != -1)
System.out.write(x);
}
in2.close();
// Alternative way to open and read
// zip files:
ZipFile zf = new ZipFile("test.zip");
Enumeration e = zf.entries();
while(e.hasMoreElements()) {
ZipEntry ze2 = (ZipEntry)e.nextElement();
System.out.println("File: " + ze2);
// ... and extract the data as before
}
} catch(Exception e) {
e.printStackTrace();
}
}
}
我曾做过仿照winzip的java实现的压缩工具,也曾经尝试过网络传输,即:一边压缩一边传输,但是经过我得各种方式,均未成功,最后还是在本机压缩后,读压缩文件传输的。
我觉得一边压缩一边传输不太可能实现吧,不知楼主是否和我的问题一致?
敬请高手、同仁赐教!
谢谢!