javax.mail.internet
类 ParameterList

java.lang.Object
  javax.mail.internet.ParameterList

public class ParameterList
extends Object

This class holds MIME parameters (attribute-value pairs). The mail.mime.encodeparameters and mail.mime.decodeparameters System properties control whether encoded parameters, as specified by RFC 2231, are supported. By default, such encoded parameters are not supported.

Also, in the current implementation, setting the System property mail.mime.decodeparameters.strict to "true" will cause a ParseException to be thrown for errors detected while decoding encoded parameters. By default, if any decoding errors occur, the original (undecoded) string is used.

版本：

1.17, 07/05/04

作者：

John Mani, Bill Shannon

构造方法摘要

ParameterList()
No-arg Constructor.

ParameterList(String s)
Constructor that takes a parameter-list string.

方法摘要

String	get(String name) Returns the value of the specified parameter.
Enumeration	getNames() Return an enumeration of the names of all parameters in this list.
void	remove(String name) Removes the specified parameter from this ParameterList.
void	set(String name, String value) Set a parameter.
void	set(String name, String value, String charset) Set a parameter.
int	size() Return the number of parameters in this list.
String	toString() Convert this ParameterList into a MIME String.
String	toString(int used) Convert this ParameterList into a MIME String.

从类 java.lang.Object 继承的方法

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

构造方法详细信息

ParameterList

public ParameterList()

No-arg Constructor.

ParameterList

public ParameterList(String s)
              throws ParseException

Constructor that takes a parameter-list string. The String is parsed and the parameters are collected and stored internally. A ParseException is thrown if the parse fails. Note that an empty parameter-list string is valid and will be parsed into an empty ParameterList.

参数：

s - the parameter-list string.

抛出：

ParseException - if the parse fails.

方法详细信息

size

public int size()

Return the number of parameters in this list.

返回：

number of parameters.

get

public String get(String name)

Returns the value of the specified parameter. Note that parameter names are case-insensitive.

参数：

name - parameter name.

返回：

Value of the parameter. Returns null if the parameter is not present.

set

public void set(String name,
                String value)

Set a parameter. If this parameter already exists, it is replaced by this new value.

参数：

name - name of the parameter.

value - value of the parameter.

set

public void set(String name,
                String value,
                String charset)

Set a parameter. If this parameter already exists, it is replaced by this new value. If the mail.mime.encodeparameters System property is true, and the parameter value is non-ASCII, it will be encoded with the specified charset, as specified by RFC 2231.

参数：

name - name of the parameter.

value - value of the parameter.

charset - charset of the parameter value.

从以下版本开始：

JavaMail 1.4

remove

public void remove(String name)

Removes the specified parameter from this ParameterList. This method does nothing if the parameter is not present.

参数：

name - name of the parameter.

getNames

public Enumeration getNames()

Return an enumeration of the names of all parameters in this list.

返回：

Enumeration of all parameter names in this list.

toString

public String toString()

Convert this ParameterList into a MIME String. If this is an empty list, an empty string is returned.

覆盖：

类 Object 中的 toString

返回：

String

toString

public String toString(int used)

Convert this ParameterList into a MIME String. If this is an empty list, an empty string is returned. The 'used' parameter specifies the number of character positions already taken up in the field into which the resulting parameter list is to be inserted. It's used to determine where to fold the resulting parameter list.

参数：

used - number of character positions already used, in the field into which the parameter list is to be inserted.

返回：

String