java.lang.Object
- org.springframework.batch.item.ItemStreamSupport
- - org.springframework.batch.item.support.AbstractItemStreamItemWriter<T>
  - - org.springframework.batch.item.file.MultiResourceItemWriter<T>

类型参数:
T - item type
所有已实现的接口:
ItemStream, ItemStreamWriter<T>, ItemWriter<T>
```
public class MultiResourceItemWriter<T>
extends AbstractItemStreamItemWriter<T>
```
Wraps a ResourceAwareItemWriterItemStream and creates a new output resource when the count of items written in current resource exceeds setItemCountLimitPerResource(int). Suffix creation can be customized with setResourceSuffixCreator(ResourceSuffixCreator). Note that new resources are created only at chunk boundaries i.e. the number of items written into one resource is between the limit set by setItemCountLimitPerResource(int) and (limit + chunk size).
作者:
Robert Kasanicky

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

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`void`	`close()`	No-op.
`void`	`open(ExecutionContext executionContext)`	No-op.
`void`	`setDelegate(ResourceAwareItemWriterItemStream<? super T> delegate)`	Delegate used for actual writing of the output.
`void`	`setItemCountLimitPerResource(int itemCountLimitPerResource)`	After this limit is exceeded the next chunk will be written into newly created resource.
`void`	`setResource(org.springframework.core.io.Resource resource)`	Prototype for output resources.
`void`	`setResourceSuffixCreator(ResourceSuffixCreator suffixCreator)`	Allows customization of the suffix of the created resources based on the index.
`void`	`setSaveState(boolean saveState)`	Indicates that the state of the reader will be saved after each commit.
`void`	`update(ExecutionContext executionContext)`	Return empty `ExecutionContext`.
`void`	`write(java.util.List<? extends T> items)`	Process the supplied data element.

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

- 构造器详细资料
  - MultiResourceItemWriter
```
public MultiResourceItemWriter()
```
- 方法详细资料
  - write
```
public void write(java.util.List<? extends T> items)
           throws java.lang.Exception
```
    从接口复制的说明: ItemWriter
    Process the supplied data element. Will not be called with any null items in normal operation.
    参数:
    items - items to be written
    抛出:
    java.lang.Exception - if there are errors. The framework will catch the exception and convert or rethrow it as appropriate.
  - setResourceSuffixCreator
```
public void setResourceSuffixCreator(ResourceSuffixCreator suffixCreator)
```
    Allows customization of the suffix of the created resources based on the index.
    参数:
    suffixCreator - ResourceSuffixCreator to be used by the writer.
  - setItemCountLimitPerResource
```
public void setItemCountLimitPerResource(int itemCountLimitPerResource)
```
    After this limit is exceeded the next chunk will be written into newly created resource.
    参数:
    itemCountLimitPerResource - int item threshold used to determine when a new resource should be created.
  - setDelegate
```
public void setDelegate(ResourceAwareItemWriterItemStream<? super T> delegate)
```
    Delegate used for actual writing of the output.
    参数:
    delegate - ResourceAwareItemWriterItemStream that will be used to write the output.
  - setResource
```
public void setResource(org.springframework.core.io.Resource resource)
```
    Prototype for output resources. Actual output files will be created in the same directory and use the same name as this prototype with appended suffix (according to setResourceSuffixCreator(ResourceSuffixCreator).
    参数:
    resource - The prototype resource.
  - setSaveState
```
public void setSaveState(boolean saveState)
```
    Indicates that the state of the reader will be saved after each commit.
    参数:
    saveState - true the state is saved.
  - close
```
public void close()
           throws ItemStreamException
```
    从类复制的说明: ItemStreamSupport
    No-op.
    指定者:
    close 在接口中 ItemStream
    覆盖:
    close 在类中 ItemStreamSupport
    抛出:
    ItemStreamException
    另请参阅:
    ItemStream.close()
  - open
```
public void open(ExecutionContext executionContext)
          throws ItemStreamException
```
    从类复制的说明: ItemStreamSupport
    No-op.
    指定者:
    open 在接口中 ItemStream
    覆盖:
    open 在类中 ItemStreamSupport
    参数:
    executionContext - current step's ExecutionContext. Will be the executionContext from the last run of the step on a restart.
    抛出:
    ItemStreamException
    另请参阅:
    ItemStream.open(ExecutionContext)
  - update
```
public void update(ExecutionContext executionContext)
            throws ItemStreamException
```
    从类复制的说明: ItemStreamSupport
    Return empty ExecutionContext.
    指定者:
    update 在接口中 ItemStream
    覆盖:
    update 在类中 ItemStreamSupport
    参数:
    executionContext - to be updated
    抛出:
    ItemStreamException
    另请参阅:
    ItemStream.update(ExecutionContext)

类 MultiResourceItemWriter<T>

构造器概要

方法概要

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

从类继承的方法 java.lang.Object

构造器详细资料

MultiResourceItemWriter

方法详细资料

write

setResourceSuffixCreator

setItemCountLimitPerResource

setDelegate

setResource

setSaveState

close

open

update