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標(biāo)題: 在Java中創(chuàng)建ZIP和JAR文件 [打印本頁(yè)]

作者: surpass_li 時(shí)間: 2010-07-08 14:25
標(biāo)題: 在Java中創(chuàng)建ZIP和JAR文件
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.exit

(-1);
}

File zipFile = new File(args

[0]);
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 byte[1024];
CRC32 crc = new CRC32();
for (int i=1, n=args.length; i < n; i++) {

String name

= args[i];

File file =

new File(name);

if (!

file.exists()) {

&

nbsp;  System.err.println("Skipping: " + name);

&

nbsp;  continue;

}

BufferedInputStream bis = new BufferedInputStream(

&

nbsp;  new FileInputStream(file));

crc.reset

();

while

((bytesRead = bis.read(buffer)) != -1) {

&

nbsp;  crc.update(buffer, 0, bytesRead);

}

bis.close();

// Reset to

beginning of input stream

bis = new

BufferedInputStream(

&

nbsp;  new FileInputStream(file));

ZipEntry

entry = new ZipEntry(name);

entry.setMethod(ZipEntry.STORED);

entry.setCompressedSize(file.length());

entry.setSize(file.length());

entry.setCrc(crc.getValue());

zos.putNextEntry(entry);

while

((bytesRead = bis.read(buffer)) != -1) {

&

nbsp;  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 (args.length < 2) {
System.err.println("usage: java ZipIt Zip.zip file1 file2 file3");
System.exit(-1);
}
File zipFile = new File(args [0]);
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 byte [1024];
CRC32 crc = new CRC32 ();
for (int i=1, n=args.length; i < n; i++) {
String name = args[i];
File file = new File (name);
if (!file.exists()) {
System.err.println("Skipping: " + name);
& nbsp; continue;
}
BufferedInputStream bis = new BufferedInputStream (
new FileInputStream (file));
crc.reset();
while ((bytesRead = bis.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);
& nbsp; entry.setCompressedSize(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 Java
Sample XML file.

John
B
12

Mary
A
11

Simon
A
18

John
B
12

Mary
A
< AGE>11

Simon
A
18

Java 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.NodeList;

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()) {
& nbsp;  Document doc = db.parse(file);
& nbsp;  Element docEle = doc.getDocumentElement();

& nbsp;  // Print root element of the document
& nbsp;  System.out.println("Root element of the document: "
& nbsp;       + docEle.getNodeName ());

& nbsp;  NodeList studentList = docEle.getElementsByTagName ("student");

& nbsp;  // Print total student elements in document
& nbsp;  System.out
& nbsp;       .println("Total students: " + studentList.getLength());

& nbsp;  if (studentList != null && studentList.getLength() > 0) {
& nbsp;    for (int i = 0; i < studentList.getLength(); i++) {

& nbsp;       Node node = studentList.item(i);

& nbsp;       if (node.getNodeType() == Node.ELEMENT_NODE) {

& nbsp;             System.out
& nbsp;                      .println ("=====================");

& nbsp;             Element e = (Element) node;
& nbsp;             NodeList nodeList = e.getElementsByTagName("name");
& nbsp;             System.out.println("Name: "
& nbsp;                      + nodeList.item(0).getChildNodes ().item(0)
& nbsp;                            ; .getNodeValue());

& nbsp;             nodeList = e.getElementsByTagName("grade");
& nbsp;             System.out.println("Grade: "
& nbsp;                      + nodeList.item(0).getChildNodes ().item(0)
& nbsp;                            ; .getNodeValue());

& nbsp;             nodeList = e.getElementsByTagName("age");
& nbsp;             System.out.println("Age: "
& nbsp;                      + nodeList.item(0).getChildNodes ().item(0)
& nbsp;                            ; .getNodeValue());
& nbsp;       }
& nbsp;    }
& nbsp;  } else {
& nbsp;    System.exit(1);
& nbsp;  }
}
} catch (Exception e) {
System.out.println(e);
}
}
public static void main(String[] args) {

XMLParser parser = new XMLParser ();
parser.getAllUserNames("c:\\test.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.NodeList;

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 docEle = 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
&nb sp;.println("Total students: " +

studentList.getLength());

if (studentList != null && studentList.getLength()

> 0) {
for (int i = 0; i < studentList.getLength

(); i++) {

Node node = studentList.item(i);

if (node.getNodeType() ==

Node.ELEMENT_NODE) {

System.out
   .println

("=====================");

Element 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.getElementsByTagName ("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 Java

import java.util.Map;
import org.apache.commons.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.println("Capital of Japan is " + countryCapitals.get ("Japan"));
System.out.println("Capital of France is " + countryCapitals.get("France"));
}
}

import java.util.Map;
import org.apache.commons.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.println("Capital of Japan is " + countryCapitals.get("Japan"));
System.out.println("Capital of France is " + countryCapitals.get("France"));
}
}
18. Send Email using Java

import javax.mail.*;
import javax.mail.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", "smtp.example.com");

// create some properties and get the 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 = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++)
{
addressTo[i] = new InternetAddress (recipients[i]);
}
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(subject);
msg.setContent(message, "text/plain");
Transport.send(msg);
}

import javax.mail.*;
import javax.mail.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", "smtp.example.com");

// create some properties and get the 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 = new InternetAddress [recipients.length];
for (int i = 0; i < recipients.length; i++)
{
addressTo[i] = new InternetAddress (recipients[i]);
}
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(subject);
msg.setContent(message, "text/plain");
Transport.send(msg);
}
19. Send HTTP request & fetching data using Java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

public class Main {
public static void main(String[] args)  {
try {
URL my_url = new URL("http://www.viralpatel.net/blogs/");&nbs p;
BufferedReader br = new BufferedReader(new InputStreamReader

(my_url.openStream()));
String strTemp = "";
while(null != (strTemp = br.readLine())){
System.out.println(strTemp);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

public class Main {
public static void main(String[] args)  {
try {
URL my_url = new URL("http://www.viralpatel.net/blogs/");
BufferedReader br = new BufferedReader(new

InputStreamReader(my_url.openStream()));
String strTemp = "";
while(null != (strTemp = br.readLine())) {
System.out.println(strTemp);
}
} catch (Exception ex) {
ex.printStackTrace ();
}
}
}
20. Resize an Array in Java

/**
* Reallocates an array with a new size, and copies the contents
* of the old array to the new array.
* @param oldArray  the old array, to be reallocated.
* @param newSize the new array size.
* @return       A new array with the same contents.
*/
private static Object resizeArray (Object oldArray, int newSize) {
int oldSize = java.lang.reflect.Array.getLength(oldArray);
Class elementType = oldArray.getClass().getComponentType();
Object newArray = java.lang.reflect.Array.newInstance(
elementType,newSize);
int preserveLength = Math.min (oldSize,newSize);
if (preserveLength > 0)
System.arraycopy (oldArray,0,newArray,0,preserveLength);
return newArray;
}

// Test routine for resizeArray().
public static void main (String[] args) {
int[] a = {1,2,3};
a = (int[])resizeArray(a,5);
a[3] = 4;
a[4] = 5;
for (int i=0; i
   System.out.println (a[i]);
}

作者: renxiao2003 時(shí)間: 2010-07-12 14:32
其實(shí)樓主應(yīng)該注意你發(fā)代碼的格式，最好整齊一些，這樣方便大家看。不行你就放到code區(qū)域，這樣方便大家復(fù)制。

作者: tong0245 時(shí)間: 2010-07-13 12:23
原來(lái)jdk 自帶zip有中文亂麻問(wèn)題。
用apache的就正常

作者: surpass_li 時(shí)間: 2010-07-13 13:05
apache 的是什么包?

作者: tong0245 時(shí)間: 2010-07-13 13:36
回復(fù) 4# surpass_li

ant lib 里邊帶個(gè)zip 工具包比jdk的好用。沒(méi)有中文問(wèn)題
不過(guò) 這個(gè)是幾年前的黃歷了

作者: surpass_li 時(shí)間: 2010-07-13 13:44

回復(fù) surpass_li

ant lib 里邊帶個(gè)zip 工具包比jdk的好用。沒(méi)有中文問(wèn)題
不過(guò) 這個(gè)是幾年前的 ...
tong0245 發(fā)表于 2010-07-13 13:36

謝謝,

作者: stelpen 時(shí)間: 2012-04-20 09:45
收藏了，謝謝！

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