ConverterBean (Cobble All-in-One 4.6.2 API)

java.lang.Object
- net.hasor.cobble.convert.ConverterBean

```
public class ConverterBean
extends Object
```
Utility methods for converting String scalar values to objects of the specified Class, String arrays to arrays of the specified Class. The actual Converter instance to be used can be registered for each possible destination Class. Unless you override them, standard Converter instances are provided for all of the following destination Classes:
- java.lang.BigDecimal (no default value)
- java.lang.BigInteger (no default value)
- boolean and java.lang.Boolean (default to false)
- byte and java.lang.Byte (default to zero)
- char and java.lang.Character (default to a space)
- java.lang.Class (no default value)
- double and java.lang.Double (default to zero)
- float and java.lang.Float (default to zero)
- int and java.lang.Integer (default to zero)
- long and java.lang.Long (default to zero)
- short and java.lang.Short (default to zero)
- java.lang.String (default to null)
- java.io.File (no default value)
- java.net.URL (no default value)
- java.sql.Date (no default value)
- java.sql.Time (no default value)
- java.sql.Timestamp (no default value)
For backwards compatibility, the standard Converters for primitive types (and the corresponding wrapper classes) return a defined default value when a conversion error occurs. If you prefer to have a ConversionException thrown instead, replace the standard Converter instances with instances created with the zero-arguments constructor. For example, to cause the Converters for integers to throw an exception on conversion errors, you could do this:
```
   // No-args constructor gets the version that throws exceptions
   Converter myConverter = new net.hasor.utils.convert.convert.IntegerConverter();
   ConverterUtils.register(myConverter, Integer.TYPE);    // Native type
   ConverterUtils.register(myConverter, Integer.class);   // Wrapper class
 
```
Converters generally treat null input as if it were invalid input, ie they return their default value if one was specified when the converter was constructed, and throw an exception otherwise. If you prefer nulls to be preserved for converters that are converting to objects (not primitives) then register a converter as above, passing a default value of null to the converter constructor (and of course registering that converter only for the .class target).

When a converter is listed above as having no default value, then that converter will throw an exception when passed null or an invalid value as its input. In particular, by default the BigInteger and BigDecimal converters have no default (and are therefore somewhat inconsistent with the other numerical converters which all have zero as their default).

Converters that generate arrays of each of the primitive types are also automatically configured (including String[]). When passed null or invalid input, these return an empty array (not null). See class AbstractArrayConverter for the supported input formats for these converters.
2017-09-13 reduction based on Apache Commons Beanutils, org.apache.commons.beanutils.ConvertUtilsBean
从以下版本开始:

1.7

版本:

$Revision: 745079 $ $Date: 2009-02-17 14:04:10 +0000 (Tue, 17 Feb 2009) $

作者:

Craig R. McClanahan, Ralph Schaer, Chris Audley, James Strachan, 赵永春 (zyc@hasor.net)

构造器概要

构造器
构造器和说明

ConverterBean()
Construct a bean with standard converters registered

构造器
构造器和说明
`ConverterBean()` Construct a bean with standard converters registered

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法和说明
`String`	`convert(Object value)` Convert the specified value into a String.
`Object`	`convert(String[] values, Class<?> clazz)` Convert an array of specified values to an array of objects of the specified class (if possible).
`Object`	`convert(String value, Class<?> clazz)` Convert the specified value to an object of the specified class (if possible).
`<T> T`	`convert(T value, Class<? extends T> targetType)` Convert the value to an object of the specified class (if possible).
`void`	`deregister()` Remove all registered `Converter`s, and re-establish the standard Converters.
`void`	`deregister(Class<?> clazz)` Remove any registered `Converter` for the specified destination `Class`.
`static ConverterBean`	`getInstance()` Get singleton instance
`Converter`	`lookup(Class<?> clazz)` Look up and return any registered `Converter` for the specified destination class; if there is no registered Converter, return `null`.
`Converter`	`lookup(Class<?> sourceType, Class<?> targetType)` Look up and return any registered `Converter` for the specified source and destination class; if there is no registered Converter, return `null`.
`void`	`register(boolean throwException, boolean defaultNull, int defaultArraySize)` Register the provided converters with the specified defaults.
`void`	`register(Converter converter, Class<?> clazz)` Register a custom `Converter` for the specified destination `Class`, replacing any previously registered Converter.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - ConverterBean
```
public ConverterBean()
```
    Construct a bean with standard converters registered
- 方法详细资料
  - getInstance
```
public static ConverterBean getInstance()
```
    Get singleton instance
    
    返回:
    
    The singleton instance
  - convert
```
public String convert(Object value)
```
    Convert the specified value into a String. If the specified value is an array, the first element (converted to a String) will be returned. The registered Converter for the java.lang.String class will be used, which allows applications to customize Object->String conversions (the default implementation simply uses toString()).
    
    参数:
    
    value - Value to be converted (may be null)
    
    返回:
    
    The converted String value
  - convert
```
public Object convert(String value,
                      Class<?> clazz)
```
    Convert the specified value to an object of the specified class (if possible). Otherwise, return a String representation of the value.
    
    参数:
    
    value - Value to be converted (may be null)
    
    clazz - Java class to be converted to
    
    返回:
    
    The converted value
    
    抛出:
    
    ConversionException - if thrown by an underlying Converter
  - convert
```
public Object convert(String[] values,
                      Class<?> clazz)
```
    Convert an array of specified values to an array of objects of the specified class (if possible). If the specified Java class is itself an array class, this class will be the type of the returned value. Otherwise, an array will be constructed whose component type is the specified class.
    
    参数:
    
    values - Array of values to be converted
    
    clazz - Java array or element class to be converted to
    
    返回:
    
    The converted value
    
    抛出:
    
    ConversionException - if thrown by an underlying Converter
  - convert
```
public <T> T convert(T value,
                     Class<? extends T> targetType)
```
    Convert the value to an object of the specified class (if possible).
    
    参数:
    
    value - Value to be converted (may be null)
    
    targetType - Class of the value to be converted to
    
    返回:
    
    The converted value
    
    抛出:
    
    ConversionException - if thrown by an underlying Converter
  - deregister
```
public void deregister()
```
    Remove all registered Converters, and re-establish the standard Converters.
  - register
```
public void register(boolean throwException,
                     boolean defaultNull,
                     int defaultArraySize)
```
    Register the provided converters with the specified defaults.
    
    参数:
    
    throwException - true if the converters should throw an exception when a conversion error occurs, otherwise false if a default value should be used.
    defaultNull - trueif the standard converters (see registerStandard(boolean, boolean)) should use a default value of null, otherwise false. N.B. This values is ignored if throwException is true defaultArraySize - The size of the default array value for array converters (N.B. This values is ignored if throwException is true). Specifying a value less than zero causes a null value to be used for the default.
  deregister public void deregister(Class<?> clazz) Remove any registered Converter for the specified destination Class. 参数: clazz - Class for which to remove a registered Converter lookup public Converter lookup(Class<?> clazz) Look up and return any registered Converter for the specified destination class; if there is no registered Converter, return null. 参数: clazz - Class for which to return a registered Converter 返回: The registered Converter or null if not found lookup public Converter lookup(Class<?> sourceType, Class<?> targetType) Look up and return any registered Converter for the specified source and destination class; if there is no registered Converter, return null. 参数: sourceType - Class of the value being converted targetType - Class of the value to be converted to 返回: The registered Converter or null if not found register public void register(Converter converter, Class<?> clazz) Register a custom Converter for the specified destination Class, replacing any previously registered Converter. 参数: converter - Converter to be registered clazz - Destination class for conversions performed by this Converter

类 ConverterBean

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

ConverterBean

方法详细资料

getInstance

convert

convert

convert

convert

deregister

register

deregister

lookup

lookup

register