创建ZIP和JAR文件java的代码.docx

1、创建ZIP和JAR文件java的代码创建ZIP和JAR文件java的代码阅读次数: 282次 发布时间: 2010-08-01 17:48:28发布人: 网络转载来源: 网络转载import java.util.zip.*; import java.io.*; public class ZipIt public static void main(String args) throws IOException if (args.length 2) System.err.println(usage: java ZipIt Zip.zip file1 file2 file3); System.exi

2、t(-1); File zipFile = new File(args0); if (zipFile.exists() System.err.println(Zip file already exists, please try another); System.exit(-2); FileOutputStream fos = new FileOutputStream(zipFile); ZipOutputStream zos = new ZipOutputStream(fos); int bytesRead; byte buffer = new byte1024; CRC32 crc = n

3、ew CRC32(); for (int i=1, n=args.length; i n; i+) String name = argsi; File file = new File(name); if (!file.exists()   System.err.println(Skipping: + name);   continue; BufferedInputStream bis = new BufferedInputStream(   new FileInputStream(file); crc.reset(); while (bytesRead = bis

4、.read(buffer) != -1)   crc.update(buffer, 0, bytesRead); bis.close(); / Reset to beginning of input stream bis = new BufferedInputStream(   new FileInputStream(file); ZipEntry entry = new ZipEntry(name); entry.setMethod(ZipEntry.STORED); entry.setCompressedSize(file.length(); entry.setSize

5、(file.length(); entry.setCrc(crc.getValue(); zos.putNextEntry(entry); while (bytesRead = bis.read(buffer) != -1)   zos.write(buffer, 0, bytesRead); bis.close(); zos.close(); import java.util.zip.*;import java.io.*;public class ZipIt public static void main(String args) throws IOException if (ar

6、gs.length 2) System.err.println(usage: java ZipIt Zip.zip file1 file2 file3);System.exit(-1);File zipFile = new File(args0);if (zipFile.exists() System.err.println(Zip file already exists, please try another);System.exit(-2);FileOutputStream fos = new FileOutputStream(zipFile);ZipOutputStream zos =

7、new ZipOutputStream(fos);int bytesRead;byte buffer = new byte1024;CRC32 crc = new CRC32();for (int i=1, n=args.length; i n; i+) String name = argsi;File file = new File(name);if (!file.exists() System.err.println(Skipping: + name);  continue;BufferedInputStream bis = new BufferedInputStream( ne

8、w FileInputStream(file);crc.reset();while (bytesRead = bis.read(buffer) != -1) crc.update(buffer, 0, bytesRead);bis.close();/ Reset to beginning of input streambis = new BufferedInputStream( new FileInputStream(file);ZipEntry entry = new ZipEntry(name);entry.setMethod(ZipEntry.STORED);  entry.s

9、etCompressedSize(file.length();entry.setSize(file.length();entry.setCrc(crc.getValue();zos.putNextEntry(entry);while (bytesRead = bis.read(buffer) != -1) zos.write(buffer, 0, bytesRead);bis.close();zos.close();16. Parsing / Reading XML file in JavaSample XML file. John B 12 Mary A 11 Simon A 18 John

10、B12MaryA11SimonA18Java code to parse above XML.package net.viralpatel.java.xmlparser; import java.io.File; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.N

11、odeList; public class XMLParser public void getAllUserNames(String fileName) try DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); File file = new File(fileName); if (file.exists()   Document doc = db.parse(file);   Element do

12、cEle = doc.getDocumentElement();   / Print root element of the document   System.out.println(Root element of the document:   + docEle.getNodeName();   NodeList studentList = docEle.getElementsByTagName(student);   / Print total student elements in document   System.out

13、  .println(Total students: + studentList.getLength();   if (studentList != null & studentList.getLength() 0)   for (int i = 0; i 0) for (int i = 0; i studentList.getLength(); i+) Node node = studentList.item(i);if (node.getNodeType() = Node.ELEMENT_NODE) System.out .println(=);Element

14、 e = (Element) node;NodeList nodeList = e.getElementsByTagName(name);System.out.println(Name: + nodeList.item(0).getChildNodes().item(0).getNodeValue();nodeList = e.getElementsByTagName(grade);System.out.println(Grade: + nodeList.item(0).getChildNodes().item(0).getNodeValue();nodeList = e.getElement

15、sByTagName(age);System.out.println(Age: + nodeList.item(0).getChildNodes().item(0).getNodeValue(); else System.exit(1); catch (Exception e) System.out.println(e);public static void main(String args) XMLParser parser = new XMLParser();parser.getAllUserNames(c:test.xml);17. Convert Array to Map in Jav

16、aimport java.util.Map; import mons.lang.ArrayUtils; public class Main public static void main(String args) String countries = United States, New York , United Kingdom, London , Netherland, Amsterdam , Japan, Tokyo , France, Paris ; Map countryCapitals = ArrayUtils.toMap(countries); System.out.printl

17、n(Capital of Japan is + countryCapitals.get(Japan); System.out.println(Capital of France is + countryCapitals.get(France); import java.util.Map;import mons.lang.ArrayUtils;public class Main public static void main(String args) String countries = United States, New York , United Kingdom, London , Net

18、herland, Amsterdam , Japan, Tokyo , France, Paris ;Map countryCapitals = ArrayUtils.toMap(countries);System.out.println(Capital of Japan is + countryCapitals.get(Japan);System.out.println(Capital of France is + countryCapitals.get(France);18. Send Email using Javaimport javax.mail.*; import javax.ma

19、il.internet.*; import java.util.*; public void postMail( String recipients , String subject, String message , String from) throws MessagingException boolean debug = false; /Set the host smtp address Properties props = new Properties(); props.put(mail.smtp.host, ); / create some properties and get th

20、e default Session Session session = Session.getDefaultInstance(props, null); session.setDebug(debug); / create a message Message msg = new MimeMessage(session); / set the from and to address InternetAddress addressFrom = new InternetAddress(from); msg.setFrom(addressFrom); InternetAddress addressTo

21、= new InternetAddressrecipients.length; for (int i = 0; i recipients.length; i+) addressToi = new InternetAddress(recipientsi); msg.setRecipients(Message.RecipientType.TO, addressTo); / Optional : You can also set your custom headers in the Email if you Want msg.addHeader(MyHeaderName, myHeaderValue); / Setting the Subject and Content Type msg.setSubject(s