java.lang.Object
- org.springframework.batch.item.ItemStreamSupport
- - org.springframework.batch.item.support.AbstractItemStreamItemReader<T>
  - - org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader<T>
    - - org.springframework.batch.item.database.AbstractPagingItemReader<T>

所有已实现的接口:
ItemReader<T>, ItemStream, ItemStreamReader<T>, org.springframework.beans.factory.InitializingBean
直接已知子类:
HibernatePagingItemReader, JdbcPagingItemReader, JpaPagingItemReader
```
public abstract class AbstractPagingItemReader<T>
extends AbstractItemCountingItemStreamItemReader<T>
implements org.springframework.beans.factory.InitializingBean
```
Abstract ItemStreamReader for to extend when reading database records in a paging fashion.
Implementations should execute queries using paged requests of a size specified in setPageSize(int). Additional pages are requested when needed as AbstractItemCountingItemStreamItemReader.read() method is called, returning an object corresponding to current position.
从以下版本开始:
2.0
作者:
Thomas Risberg, Dave Syer

字段概要
字段
修饰符和类型字段说明
protected org.apache.commons.logging.Log logger
protected java.util.List<T> results

构造器概要
构造器
构造器说明
AbstractPagingItemReader()

方法概要

所有方法实例方法抽象方法具体方法
修饰符和类型	方法	说明
`void`	`afterPropertiesSet()`	Check mandatory properties.
`protected void`	`doClose()`	Close the resources opened in `AbstractItemCountingItemStreamItemReader.doOpen()`.
`protected abstract void`	`doJumpToPage(int itemIndex)`
`protected void`	`doOpen()`	Open resources necessary to start reading input.
`protected T`	`doRead()`	Read next item from input.
`protected abstract void`	`doReadPage()`
`int`	`getPage()`	The current page number.
`int`	`getPageSize()`	The page size configured for this reader.
`protected void`	`jumpToItem(int itemIndex)`	Move to the given item index.
`void`	`setPageSize(int pageSize)`	The number of rows to retrieve at a time.

从类继承的方法 org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader
close, getCurrentItemCount, isSaveState, open, read, setCurrentItemCount, setMaxItemCount, setSaveState, update

从类继承的方法 org.springframework.batch.item.ItemStreamSupport
getExecutionContextKey, setExecutionContextName, setName

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

- 字段详细资料
  - logger
```
protected org.apache.commons.logging.Log logger
```
  - results
```
protected volatile java.util.List<T> results
```
- 构造器详细资料
  - AbstractPagingItemReader
```
public AbstractPagingItemReader()
```
- 方法详细资料
  - getPage
```
public int getPage()
```
    The current page number.
    返回:
    the current page
  - getPageSize
```
public int getPageSize()
```
    The page size configured for this reader.
    返回:
    the page size
  - setPageSize
```
public void setPageSize(int pageSize)
```
    The number of rows to retrieve at a time.
    参数:
    pageSize - the number of rows to fetch per page
  - afterPropertiesSet
```
public void afterPropertiesSet()
                        throws java.lang.Exception
```
    Check mandatory properties.
    指定者:
    afterPropertiesSet 在接口中 org.springframework.beans.factory.InitializingBean
    抛出:
    java.lang.Exception
    另请参阅:
    InitializingBean.afterPropertiesSet()
  - doRead
```
protected T doRead()
            throws java.lang.Exception
```
    从类复制的说明: AbstractItemCountingItemStreamItemReader
    Read next item from input.
    指定者:
    doRead 在类中 AbstractItemCountingItemStreamItemReader<T>
    返回:
    an item or null if the data source is exhausted
    抛出:
    java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework
  - doReadPage
```
protected abstract void doReadPage()
```
  - doOpen
```
protected void doOpen()
               throws java.lang.Exception
```
    从类复制的说明: AbstractItemCountingItemStreamItemReader
    Open resources necessary to start reading input.
    指定者:
    doOpen 在类中 AbstractItemCountingItemStreamItemReader<T>
    抛出:
    java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework
  - doClose
```
protected void doClose()
                throws java.lang.Exception
```
    从类复制的说明: AbstractItemCountingItemStreamItemReader
    Close the resources opened in AbstractItemCountingItemStreamItemReader.doOpen().
    指定者:
    doClose 在类中 AbstractItemCountingItemStreamItemReader<T>
    抛出:
    java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework
  - jumpToItem
```
protected void jumpToItem(int itemIndex)
                   throws java.lang.Exception
```
    从类复制的说明: AbstractItemCountingItemStreamItemReader
    Move to the given item index. Subclasses should override this method if there is a more efficient way of moving to given index than re-reading the input using AbstractItemCountingItemStreamItemReader.doRead().
    覆盖:
    jumpToItem 在类中 AbstractItemCountingItemStreamItemReader<T>
    参数:
    itemIndex - index of item (0 based) to jump to.
    抛出:
    java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework
  - doJumpToPage
```
protected abstract void doJumpToPage(int itemIndex)
```

修饰符和类型	字段	说明
`protected org.apache.commons.logging.Log`	`logger`
`protected java.util.List<T>`	`results`

类 AbstractPagingItemReader<T>

字段概要

构造器概要

方法概要

从类继承的方法 org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader

从类继承的方法 org.springframework.batch.item.ItemStreamSupport

从类继承的方法 java.lang.Object

字段详细资料

logger

results

构造器详细资料

AbstractPagingItemReader

方法详细资料

getPage

getPageSize

setPageSize

afterPropertiesSet

doRead

doReadPage

doOpen

doClose

jumpToItem

doJumpToPage