在Java中创建ZIP和JAR文件

surpass_li

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]);  
}

renxiao2003

其实楼主应该注意你发代码的格式，最好整齐一些，这样方便大家看。不行你就放到code区域，这样方便大家复制。

tong0245

原来jdk 自带zip有中文乱麻问题。
用apache的就正常

surpass_li

apache  的是什么包?

tong0245

回复 4# surpass_li


    ant lib 里边带个zip 工具包 比jdk的好用。 没有中文问题
不过 这个是几年前的黄历了

surpass_li

回复  surpass_li


    ant lib 里边带个zip 工具包 比jdk的好用。 没有中文问题
不过 这个是几年前的 ...
tong0245 发表于 2010-07-13 13:36

    谢谢,

stelpen

收藏了，谢谢！