以下是使用Apache Beam的WriteToText和WriteToFiles方法的代码示例：

1. 使用WriteToText方法将PCollection写入文本文件：

import apache_beam as beam

def write_to_text(data):
    return data | beam.io.WriteToText('output.txt')

with beam.Pipeline() as p:
    # 创建PCollection
    data = p | beam.Create(['Hello', 'World', 'Apache', 'Beam'])
    
    # 将PCollection写入文本文件
    write_to_text(data)

2. 使用WriteToFiles方法将PCollection写入多个文件：

import apache_beam as beam

def write_to_files(element):
    # 根据元素的值创建文件名
    filename = 'output_' + element + '.txt'
    return element | beam.io.WriteToText(filename)

with beam.Pipeline() as p:
    # 创建PCollection
    data = p | beam.Create(['file1', 'file2', 'file3'])
    
    # 将PCollection写入多个文件
    data | beam.Map(write_to_files)

在这些示例中，使用beam.io.WriteToText()和beam.io.WriteToFiles()方法将PCollection的元素写入文本文件。WriteToText方法将所有元素写入单个文件，而WriteToFiles方法根据元素的值创建多个文件。