cn.hutool.core.collection

Class LineIter

java.lang.Object

cn.hutool.core.collection.ComputeIter<String>

cn.hutool.core.collection.LineIter

All Implemented Interfaces:

IterableIter<String>, Closeable, Serializable, AutoCloseable, Iterable<String>, Iterator<String>

public class LineIter
extends ComputeIter<String>
implements IterableIter<String>, Closeable, Serializable

将Reader包装为一个按照行读取的Iterator
此对象遍历结束后，应关闭之，推荐使用方式:

 LineIterator it = null;
 try {
        it = new LineIterator(reader);
        while (it.hasNext()) {
                String line = it.nextLine();
                // do something with line
        }
 } finally {
                it.close();
 }
 

此类来自于Apache Commons io

Since:

4.1.1

Author:

looly

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
LineIter(InputStream in, Charset charset) 构造
LineIter(Reader reader) 构造

Method Summary

Modifier and Type	Method and Description
void	close() 关闭Reader
protected String	computeNext() 计算新的节点，通过实现此方法，当调用ComputeIter.hasNext()时将此方法产生的节点缓存，直到调用ComputeIter.next()取出 当无下一个节点时，须返回null表示遍历结束
protected boolean	isValidLine(String line) 重写此方法来判断是否每一行都被返回，默认全部为true

Methods inherited from class cn.hutool.core.collection.ComputeIter

finish, hasNext, next

Methods inherited from class java.lang.Object

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

Methods inherited from interface cn.hutool.core.collection.IterableIter

iterator

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Iterator

forEachRemaining, hasNext, next, remove

Constructor Detail

LineIter

public LineIter(InputStream in,
                Charset charset)
         throws IllegalArgumentException

构造

Parameters:

in - InputStream

charset - 编码

Throws:

IllegalArgumentException - reader为null抛出此异常

LineIter

public LineIter(Reader reader)
         throws IllegalArgumentException

构造

Parameters:

reader - Reader对象，不能为null

Throws:

IllegalArgumentException - reader为null抛出此异常

Method Detail

computeNext

protected String computeNext()

Description copied from class: ComputeIter

计算新的节点，通过实现此方法，当调用ComputeIter.hasNext()时将此方法产生的节点缓存，直到调用ComputeIter.next()取出
当无下一个节点时，须返回null表示遍历结束

Specified by:

computeNext in class ComputeIter<String>

Returns:

节点值

close

public void close()

关闭Reader

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

isValidLine

protected boolean isValidLine(String line)

重写此方法来判断是否每一行都被返回，默认全部为true

Parameters:

line - 需要验证的行

Returns:

是否通过验证