How to perform simple zip compression for a single file

Java has a zip package containing zipinputstream and zipoutputstream classes. We only need to read the file and then use zipoutputstream to output it. zipoutputstream is output in zipentry units, for Java's simple compression of a single file, see the following example:

Package COM. tjcyjd. commons; import Java. io. file; import Java. io. fileinputstream; import Java. io. fileoutputstream; import Java. io. inputstream; import java.util.zip. zipentry; import java.util.zip. zipoutputstream;/*** compress a single file * @ author YJD */public class filecompress {public static void zip (string inname, string outname) {file = new file (inname); int length = (INT) file. length (); byte [] B = new byte [length]; try {inputstream in = new fileinputstream (File); In. read (B); In. close ();} catch (exception e) {e. printstacktrace ();} Try {zipoutputstream Zout = new zipoutputstream (New fileoutputstream (new file (outname); Zout. setlevel (9); zipentry = new zipentry (file. getname (); Zout. putnextentry (zipentry); Zout. write (B); Zout. finish (); Zout. close ();} catch (exception e) {e. printstacktrace () ;}} public static void main (string [] ARGs) {string inname = "D:/yjd.txt"; string outname = "D:/yjd.zip "; filecompress.zip (inname, outname );}}

Zout. setlevel (9) is to set the compression level. The parameter 0-9 0 indicates no compression, and 9 indicates the compression is the most severe. If there is no need for efficiency, but the volume requirement is relatively high, it can be set to 9.