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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class JarFile - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.util.jar
Class JarFile

java.lang.Object
  |
  +--java.util.zip.ZipFile
        |
        +--java.util.jar.JarFile

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public class JarFile

extends ZipFile

The JarFile class is used to read the contents of a JAR file from any file that can be opened with java.io.RandomAccessFile. It extends the class java.util.zip.ZipFile with support for reading an optional Manifest entry. The Manifest can be used to specify meta-information about the JAR file and its entries.

Since:

JDK1.2

See Also:

Manifest, ZipFile, JarEntry

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Field Summary
static String	MANIFEST_NAME

 

Constructor Summary

JarFile(File file)           Creates a new JarFile to read from the specified File object.

JarFile(File file, boolean verify)           Creates a new JarFile to read from the specified File object.

JarFile(String name)           Creates a new JarFile to read from the specified file name.

JarFile(String name, boolean verify)           Creates a new JarFile to read from the specified file name.

 

Method Summary
Enumeration	entries()           Returns an enumeration of the ZIP file entries.
ZipEntry	getEntry(String name)           Returns the zip file entry for the specified name, or null if not found.
InputStream	getInputStream(ZipEntry ze)           Returns an input stream for reading the contents of the specified ZIP file entry.
JarEntry	getJarEntry(String name)           Returns the JarEntry for the given entry name or null if not found.
Manifest	getManifest()           Returns the JAR file manifest, or null if none.

 

Methods inherited from class java.util.zip.ZipFile

close, getName, size

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

MANIFEST_NAME

public static final String MANIFEST_NAME

Constructor Detail

JarFile

public JarFile(String name)
        throws IOException

Creates a new JarFile to read from the specified file name. The JarFile will be verified if it is signed.

Parameters:

name - the name of the JAR file to be opened for reading

Throws:

FileNotFoundException - if the file could not be found

IOException - if an I/O error has occurred

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JarFile

public JarFile(String name,
               boolean verify)
        throws IOException

Creates a new JarFile to read from the specified file name.

Parameters:

name - the name of the JAR file to be opened for reading

verify - whether or not to verify the JarFile if it is signed.

Throws:

FileNotFoundException - if the file could not be found

IOException - if an I/O error has occurred

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JarFile

public JarFile(File file)
        throws IOException

Creates a new JarFile to read from the specified File object. The JarFile will be verified if it is signed.

Parameters:

file - the JAR file to be opened for reading

Throws:

FileNotFoundException - if the file could not be found

IOException - if an I/O error has occurred

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JarFile

public JarFile(File file,
               boolean verify)
        throws IOException

Creates a new JarFile to read from the specified File object.

Parameters:

file - the JAR file to be opened for reading

verify - whether or not to verify the JarFile if it is signed.

Throws:

FileNotFoundException - if the file could not be found

IOException - if an I/O error has occurred

Method Detail

getManifest

public Manifest getManifest()
                     throws IOException

Returns the JAR file manifest, or null if none.

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getJarEntry

public JarEntry getJarEntry(String name)

Returns the JarEntry for the given entry name or null if not found.

Parameters:

name - the JAR file entry name

See Also:

JarEntry

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getEntry

public ZipEntry getEntry(String name)

Description copied from class: ZipFile

Returns the zip file entry for the specified name, or null if not found.

Overrides:

getEntry in class ZipFile

Tags copied from class: ZipFile

Parameters:

name - the name of the entry

Returns:

the zip file entry, or null if not found

Throws:

IllegalStateException - if the zip file has been closed

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entries

public Enumeration entries()

Description copied from class: ZipFile

Returns an enumeration of the ZIP file entries.

Overrides:

entries in class ZipFile

Tags copied from class: ZipFile

Throws:

IllegalStateException - if the zip file has been closed

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getInputStream

public InputStream getInputStream(ZipEntry ze)
                           throws IOException

Returns an input stream for reading the contents of the specified ZIP file entry.

Overrides:

getInputStream in class ZipFile

Parameters:

ze - the zip file entry

Throws:

ZipException - if a ZIP format error has occurred

IOException - if an I/O error has occurred

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