程序包 java.util.jar

类 Manifest

java.lang.Object

java.util.jar.Manifest

所有已实现的接口:

Cloneable

public class Manifest
extends Object
implements Cloneable

The Manifest class is used to maintain Manifest entry names and their associated Attributes. There are main Manifest Attributes as well as per-entry Attributes. For information on the Manifest format, please see the Manifest format specification.

从以下版本开始:

1.2

另请参阅:

Attributes

构造器概要

构造器

构造器	说明
Manifest()	Constructs a new, empty Manifest.
Manifest(InputStream is)	Constructs a new Manifest from the specified input stream.
Manifest(Manifest man)	Constructs a new Manifest that is a copy of the specified Manifest.

方法概要

限定符和类型	方法	说明
void	clear()	Clears the main Attributes as well as the entries in this Manifest.
Object	clone()	Returns a shallow copy of this Manifest.
boolean	equals(Object o)	Returns true if the specified Object is also a Manifest and has the same main Attributes and entries.
Attributes	getAttributes(String name)	Returns the Attributes for the specified entry name.
Map<String,Attributes>	getEntries()	Returns a Map of the entries contained in this Manifest.
Attributes	getMainAttributes()	Returns the main Attributes for the Manifest.
int	hashCode()	Returns the hash code for this Manifest.
void	read(InputStream is)	Reads the Manifest from the specified InputStream.
void	write(OutputStream out)	Writes the Manifest to the specified OutputStream.

从类继承的方法 java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

Manifest

public Manifest()

Constructs a new, empty Manifest.

Manifest

public Manifest(InputStream is)
         throws IOException

Constructs a new Manifest from the specified input stream.

参数:

is - the input stream containing manifest data

抛出:

IOException - if an I/O error has occurred

Manifest

public Manifest(Manifest man)

Constructs a new Manifest that is a copy of the specified Manifest.

参数:

man - the Manifest to copy

方法详细资料

getMainAttributes

public Attributes getMainAttributes()

Returns the main Attributes for the Manifest.

返回:

the main Attributes for the Manifest

getEntries

public Map<String,Attributes> getEntries()

Returns a Map of the entries contained in this Manifest. Each entry is represented by a String name (key) and associated Attributes (value). The Map permits the null key, but no entry with a null key is created by read(java.io.InputStream), nor is such an entry written by using write(java.io.OutputStream).

返回:

a Map of the entries contained in this Manifest

getAttributes

public Attributes getAttributes(String name)

Returns the Attributes for the specified entry name. This method is defined as:

      return (Attributes)getEntries().get(name)
 

Though null is a valid name, when getAttributes(null) is invoked on a Manifest obtained from a jar file, null will be returned. While jar files themselves do not allow null-named attributes, it is possible to invoke getEntries() on a Manifest, and on that result, invoke put with a null key and an arbitrary value. Subsequent invocations of getAttributes(null) will return the just-put value.

Note that this method does not return the manifest's main attributes; see getMainAttributes().

参数:

name - entry name

返回:

the Attributes for the specified entry name

clear

public void clear()

Clears the main Attributes as well as the entries in this Manifest.

write

public void write(OutputStream out)
           throws IOException

Writes the Manifest to the specified OutputStream. Attributes.Name.MANIFEST_VERSION must be set in MainAttributes prior to invoking this method.

参数:

out - the output stream

抛出:

IOException - if an I/O error has occurred

另请参阅:

getMainAttributes()

read

public void read(InputStream is)
          throws IOException

Reads the Manifest from the specified InputStream. The entry names and attributes read will be merged in with the current manifest entries.

参数:

is - the input stream

抛出:

IOException - if an I/O error has occurred

equals

public boolean equals(Object o)

Returns true if the specified Object is also a Manifest and has the same main Attributes and entries.

覆盖:

equals 在类中 Object

参数:

o - the object to be compared

返回:

true if the specified Object is also a Manifest and has the same main Attributes and entries

另请参阅:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Returns the hash code for this Manifest.

覆盖:

hashCode 在类中 Object

返回:

a hash code value for this object.

另请参阅:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

clone

public Object clone()

Returns a shallow copy of this Manifest. The shallow copy is implemented as follows:

     public Object clone() { return new Manifest(this); }
 

覆盖:

clone 在类中 Object

返回:

a shallow copy of this Manifest

另请参阅:

Cloneable