Java 中的 BodyContentHandler 类
原文:https://www . geesforgeks . org/bodycontenthandler-in-Java 类/
Apache Tika 是一个允许你从不同文档中提取数据的库()。PDF ，。 DOCX 等。).在本教程中，我们将使用 BodyContentHandler 提取数据。将使用的下一个依赖项如下所示:
<dependency>
<groupId>org.apache.tika < / groupId >
<artifactId>tika - parsers < / artifactId >
<version>1.26 < / version >
< / dependency >
【body contenthandler】是一个类修饰器，允许你获取 XHTML < body >标签中的所有内容。<正文>或<正文/ > 不计入结果值。
我们先来讨论一下这个类的各种构造函数如下:
| 【正文内容处理程序() | Write all the contents into the internal stringbuffer area, and just call *tostring () to get the contents. By default, the maximum content length of* is 100 000 characters. If this limit is reached, a *saxexception* will be thrown. | | 正文内容处理程序(写入限制) | 将所有内容写入内部字符串缓冲区，要获取内容只需调用 toString()。 *【写入限制】*是可以读取的最大字符数，设置-1 禁用该限制。如果达到这个极限，将抛出**异常**。 | | body contenthandler(输出流输出流) | Writes everything to the given output stream. There are no content restrictions. | | 正文内容处理程序(编写器) | Write everything to the given Writer. There are no content restrictions. | | 正文内容处理程序(内容处理程序) | Pass everything to the given handler. |这个类的 me 方法如下:
| way | Action performed by | | --- | --- | | *匹配内容处理器* | You are allowed to pass [T0】 XPath 【T1] |获取数据
注意: BodyContentHandler 类 d o es 没有实现 ContentHandler 接口的任何方法，只是描述了 MatchingContentHandler 获取 XHTML body 内容的 XPath。
实施:
示例 1: 将所有内容读入内部字符串缓冲区
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Read Everything into Inner String Buffer
// Main class
public class GFG {
// Method 1
// To parse the string
public String parseToStringExample(String fileName)
throws IOException, TikaException, SAXException
{
// Creating an object of InputStream class
InputStream stream
= this.getClass()
.getClassLoader()
.getResourceAsStream(fileName);
Parser parser = new AutoDetectParser();
ContentHandler handler = new BodyContentHandler();
Metadata metadata = new Metadata();
ParseContext context = new ParseContext();
// Parsing the string
parser.parse(stream, handler, metadata, context);
return handler.toString();
}
// Method 2
// Main driver method
public static void main(String[] args)
throws TikaException, IOException, SAXException
{
// Creating object of main class in main method
GFG example = new GFG();
// Display message for better readability
System.out.println("Result");
// Calling the method 1 to parse string by
// providing file as an argument
System.out.println(example.parseToStringExample(
"test-reading.pdf"));
}
}
输出:
示例 2: 将内容写入指定最大内容长度的文件
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Write Content into File by
// Specifying the Maximum Content Length
// Main class
// BodyContentHandlerWriteToFileExample
public class GFG {
// Method 1
// Main driver method
public static void main(String[] args)
throws TikaException, IOException, SAXException
{
// Creating an object of the class
GFG example = new GFG();
// Calling the Method 2 in main() method and
// passing the file and directory path as arguments
// to it
example.writeParsedDataToFile(
"test-reading.pdf",
"/Users/ali_zhagparov/Desktop/pdf-content.txt");
}
// Method 2
// Writing parsed data to a file
public void
writeParsedDataToFile(String readFromFileName,
String writeToFileName)
throws IOException, TikaException, SAXException
{
// Creating an object of InputStream
InputStream stream
= this.getClass()
.getClassLoader()
.getResourceAsStream(readFromFileName);
// Creating an object of File class
File yourFile = new File(writeToFileName);
// If file is already existing then
// no operations to be performed
yourFile.createNewFile();
FileOutputStream fileOutputStream
= new FileOutputStream(yourFile, false);
Parser parser = new AutoDetectParser();
ContentHandler handler
= new BodyContentHandler(fileOutputStream);
Metadata metadata = new Metadata();
ParseContext context = new ParseContext();
parser.parse(stream, handler, metadata, context);
}
}
输出:
在控制台窗口上看不到任何东西，因为它会记录目录映射，在这种情况下，它会尝试将所有信息写入文件
该计划的结果是。txt“with”。pdf '文件内容如下:
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