【apache tika】apache tika获取文件内容(与FileUtils的对比)

　　Tika支持多种功能：

　　　　　　文档类型检测 内容提取 元数据提取 语言检测

重要特点:

• 统一解析器接口：Tika封装在一个单一的解析器接口的第三方解析器库。由于这个特征，用户逸出从选择合适的解析器库的负担，并使用它，根据所遇到的文件类型。

• 低内存占用：Tika因此消耗更少的内存资源也很容易嵌入Java应用程序。也可以用Tika平台像移动那样PDA资源少，运行该应用程序。

• 快速处理：从应用连结内容检测和提取可以预期的。

• 灵活元数据：Tika理解所有这些都用来描述文件的元数据模型。

• 解析器集成：Tika可以使用可在单一应用程序中每个文件类型的各种解析器库。

• MIME类型检测： Tika可以检测并从所有包括在MIME标准的媒体类型中提取内容。

• 语言检测： Tika包括语言识别功能，因此可以在一个多语种网站基于语言类型的文档中使用。

使用Parser接口内容提取

CompositeParser

　　给出的图表显示Tika通用解析器类CompositeParser 主AutoDetectParser。由于CompositeParser类遵循复合设计模式，可以用一组解析器实例作为一个单独的解析器。CompositeParser类也可以访问所有实现解析器接口的类。

AutoDetectParser

　　 这是CompositeParser的子类，它提供了自动类型检测。使用此功能，AutoDetectParser自动发送收到的文件到使用该复合方法适当分析器类。

 parse()方法

　　除了parseToString()，还可以使用分析器接口的parse()方法。该方法的原型如下所示。

void parse(
InputStream stream, 
ContentHandler handler, 
Metadata metadata, 
ParseContext context) 
throws IOException, SAXException, TikaException

我们简要解释方法参数：

stream，从需要被解析文档创建的InputStream实例
handler，接收从输入文档解析XHTML SAX事件序列的ContentHandler对象，负责处理事件并以特定的形式导出结果。
metadata,元数据对象，它在解析器中传递元数据属性
context，带有上下文相关信息的ParseContext实例，用于自定义解析过程。

如果从输入流读取失败，则parse方法抛出IOException异常，从流中获取的文档不能被解析抛TikaException异常，处理器不能处理事件则抛SAXException异常。

当解析文档时，Tika尽量重用已经存在的解析库，如Apache POI或PDFBox。因此，大多数解析器实现类仅适配这些外部类库。下面，我们将了解如何使用处理程序和元数据参数来提取文档的内容和元数据。为了方便，我们能使用Tika的门面类调用解析器Api。

0.Tika的maven地址:

        <!--tika解析文本内容-->
        <dependency>
            <groupId>org.apache.tika</groupId>
            <artifactId>tika-parsers</artifactId>
            <version>1.17</version>
        </dependency>

1.简单的用法

1.1获取文件类型

　　Tika支持MIME所提供的所有互联网媒体文件类型。

    /**
     * 检测文件类型的用法
     */
    public static void test1(){
        File file = new File("G:/tikatest/test.mp4");

        Tika tika = new Tika();
        String filetype = null;
        try {
            filetype = tika.detect(file);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(filetype);
    }

结果:

video/mp4

　　我们将后缀去掉改为test也可以检测出同样的结果，其根据文件拓展名与文件内容检测。

1.2提取Txt文本内容

解析文件，一般用于Tika外观facade类的parseToString()方法。

    /**
     * 读取txt内容
     */
    public static void test2(){
        File file = new File("G:/tikatest/test.txt");

        Tika tika = new Tika();
        String filecontent = null;
        try {
            filecontent = tika.parseToString(file);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TikaException e) {
            e.printStackTrace();
        }
        System.out.println("Extracted Content: " + filecontent);
    }

结果:

Extracted Content: 111
222
333
444
555
666

补充:与之等价的FileUtils功能实现(commons-io包功能)

    public static void test3(){
        File file = new File("G:/tikatest/test.txt");
        String s = null;
        try {
            s = FileUtils.readFileToString(file);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(s);
    }

 1.3提取元数据

　　 元数据是什么，是文件所提供的附加信息。如果我们考虑一个音频文件，艺术家名，专辑名，标题下自带的元数据。

    public static void test4(){
        File file=new File("G:/tikatest/test.mp4");

        Parser parser = new AutoDetectParser();
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = null;
        try {
            inputstream = new FileInputStream(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        ParseContext context = new ParseContext();

        try {
            parser.parse(inputstream, handler, metadata, context);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (TikaException e) {
            e.printStackTrace();
        }
        System.out.println(handler.toString());

        //getting the list of all meta data elements
        String[] metadataNames = metadata.names();

        for(String name : metadataNames) {
            System.out.println(name + ": " + metadata.get(name));
        }
    }

 结果:

Software: OnePlus3-user 7.1.1 NMF26F 76 dev-keys
GPS Altitude Ref: Unknown (2)
Metering Mode: Center weighted average
Model: ONEPLUS A3010
meta:save-date: 2017-09-02T16:32:15
File Name: apache-tika-4154811460990247864.tmp
Exposure Mode: Auto exposure
Exif Version: 2.20
Sensing Method: One-chip color area sensor
tiff:ImageLength: 540
exif:Flash: false
Creation-Date: 2017-09-02T16:32:15
Interoperability Version: 1.00
ISO Speed Ratings: 640
X Resolution: 72 dots per inch
Shutter Speed Value: 1/20 sec
tiff:ImageWidth: 720
Thumbnail Width Pixels: 0
tiff:XResolution: 72.0
Image Width: 720 pixels
Last-Save-Date: 2017-09-02T16:32:15
exif:FNumber: 2.0
Number of Tables: 4 Huffman tables
F-Number: f/2.0
Color Space: sRGB
meta:creation-date: 2017-09-02T16:32:15
Resolution Units: inch
Data Precision: 8 bits
File Modified Date: 星期二 十月 16 22:15:54 +08:00 2018
tiff:BitsPerSample: 8
Last-Modified: 2017-09-02T16:32:15
tiff:YResolution: 72.0
YCbCr Positioning: Center of pixel array
Compression Type: Baseline
Components Configuration: YCbCr
exif:IsoSpeedRatings: 640
X-Parsed-By: org.apache.tika.parser.DefaultParser
Focal Length 35: 28 mm
modified: 2017-09-02T16:32:15
Brightness Value: 0
Thumbnail Offset: 874 bytes
Exif Image Height: 3480 pixels
Focal Length: 4.3 mm
Thumbnail Length: 14211 bytes
White Balance Mode: Auto white balance
Content-Type: image/jpeg
Make: OnePlus
tiff:Make: OnePlus
Date/Time Original: 2017:09:02 08:32:15
Scene Capture Type: Standard
Exif Image Width: 4640 pixels
Makernote: [26 values]
dcterms:created: 2017-09-02T16:32:15
exif:ExposureTime: 0.05
date: 2017-09-02T16:32:15
Component 1: Y component: Quantization table 0, Sampling factors 2 horiz/2 vert
Component 2: Cb component: Quantization table 1, Sampling factors 1 horiz/1 vert
Component 3: Cr component: Quantization table 1, Sampling factors 1 horiz/1 vert
tiff:ResolutionUnit: Inch
Interoperability Index: Recommended Exif Interoperability Rules (ExifR98)
Flash: Flash did not fire, auto
Date/Time Digitized: 2017:09:02 08:32:15
File Size: 50158 bytes
Thumbnail Height Pixels: 0
Resolution Unit: Inch
Sub-Sec Time Original: 994455
XMP Value Count: 4
tiff:Software: OnePlus3-user 7.1.1 NMF26F 76 dev-keys
Aperture Value: f/2.0
Number of Components: 3
dcterms:modified: 2017-09-02T16:32:15
tiff:Model: ONEPLUS A3010
Image Height: 540 pixels
Sub-Sec Time Digitized: 994455
Sub-Sec Time: 994455
Scene Type: Directly photographed image
Exposure Time: 0.05 sec
exif:DateTimeOriginal: 2017-09-02T16:32:15
exif:FocalLength: 4.26
Compression: JPEG (old-style)
FlashPix Version: 1.00
Date/Time: 2017:09:02 08:32:15
Exposure Program: Unknown (0)
Y Resolution: 72 dots per inch

1.4语言检测

tika可以检测的18种语言:

    public static void test6(){
        //Instantiating a file object
        File file = new File("G:/tikatest/test.txt");

        //Parser method parameters
        Parser parser = new AutoDetectParser();
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream content = null;
        try {
            content = new FileInputStream(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        //Parsing the given document
        try {
            parser.parse(content, handler, metadata, new ParseContext());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (TikaException e) {
            e.printStackTrace();
        }

        LanguageIdentifier object = new LanguageIdentifier(handler.toString());
        System.out.println("Language name :" + object.getLanguage());
    }

结果:

Language name :lt

 1.5提取PDF

 　　强大到可以提取里面的连接以及小标点符号。可以获取PDF的内容与元数据。

    public static void test7() throws IOException, TikaException, SAXException {
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("G:/tikatest/4.pdf"));
        ParseContext pcontext = new ParseContext();

        //parsing the document using PDF parser
        PDFParser pdfparser = new PDFParser();
        pdfparser.parse(inputstream, handler, metadata,pcontext);

        //getting the content of the document
        System.out.println("Contents of the PDF :" + handler.toString());

        //getting metadata of the document
        System.out.println("Metadata of the PDF:");
        String[] metadataNames = metadata.names();

        for(String name : metadataNames) {
            System.out.println(name+ " : " + metadata.get(name));
        }
    }

结果:

Contents of the PDF :
个人简历 
...............................


Metadata of the PDF:
access_permission:extract_for_accessibility : true
pdf:docinfo:title : 个人简历
meta:save-date : 2018-06-12T07:41:54Z
pdf:docinfo:modified : 2018-06-12T07:41:54Z
dcterms:created : 2018-06-12T07:41:54Z
Author : liqiang qiao
date : 2018-06-12T07:41:54Z
access_permission:can_modify : true
access_permission:modify_annotations : true
creator : liqiang qiao
Creation-Date : 2018-06-12T07:41:54Z
title : 个人简历
meta:author : liqiang qiao
access_permission:fill_in_form : true
created : Tue Jun 12 15:41:54 CST 2018
pdf:docinfo:producer : Microsoft® Word 2013
dc:format : application/pdf; version=1.5
access_permission:can_print : true
pdf:docinfo:created : 2018-06-12T07:41:54Z
xmp:CreatorTool : Microsoft® Word 2013
Last-Save-Date : 2018-06-12T07:41:54Z
dc:title : 个人简历
access_permission:assemble_document : true
dcterms:modified : 2018-06-12T07:41:54Z
meta:creation-date : 2018-06-12T07:41:54Z
pdf:docinfo:creator : liqiang qiao
dc:creator : liqiang qiao
pdf:PDFVersion : 1.5
Last-Modified : 2018-06-12T07:41:54Z
modified : 2018-06-12T07:41:54Z
xmpTPg:NPages : 2
access_permission:can_print_degraded : true
pdf:encrypted : false
access_permission:extract_content : true
producer : Microsoft® Word 2013
pdf:docinfo:creator_tool : Microsoft® Word 2013
Content-Type : application/pdf

1.6提取MSOffice文档(读取word，excel)

　　　　从Microsoft Office文档中提取内容和元数据。

    public static void test8() throws TikaException, SAXException, IOException {
        //detecting the file type
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("G:/tikatest/test.docx"));
        ParseContext pcontext = new ParseContext();

        //OOXml parser
        OOXMLParser msofficeparser = new OOXMLParser ();
        msofficeparser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
        System.out.println("Metadata of the document:");
        String[] metadataNames = metadata.names();

        for(String name : metadataNames) {
            System.out.println(name + ": " + metadata.get(name));
        }
    }

 结果:

Contents of the document: -Xms5200M -Xmx5200M -XX:PermSize=512M -XX:MaxPermSize=512M

http_load使用教程: https://www.cnblogs.com/shijingjing07/p/6539179.html
1.默认配置；
内存

线程数量:

1.只修改JVM参数
内存

2.并发

2.修改JVM与并发
JVM

并发

Metadata of the document:
cp:revision: 19
meta:last-author: liqiang qiao
Last-Author: liqiang qiao
meta:save-date: 2017-12-14T10:25:00Z
Application-Name: Microsoft Office Word
Author: liqiang qiao
dcterms:created: 2017-12-14T09:28:00Z
Application-Version: 15.0000
Character-Count-With-Spaces: 195
date: 2017-12-14T10:25:00Z
Total-Time: 57
extended-properties:Template: Normal.dotm
meta:line-count: 1
creator: liqiang qiao
publisher:
Word-Count: 29
meta:paragraph-count: 1
Creation-Date: 2017-12-14T09:28:00Z
extended-properties:AppVersion: 15.0000
meta:author: liqiang qiao
Line-Count: 1
extended-properties:Application: Microsoft Office Word
Paragraph-Count: 1
Last-Save-Date: 2017-12-14T10:25:00Z
Revision-Number: 19
dcterms:modified: 2017-12-14T10:25:00Z
meta:creation-date: 2017-12-14T09:28:00Z
Template: Normal.dotm
Page-Count: 1
meta:character-count: 167
dc:creator: liqiang qiao
meta:word-count: 29
Last-Modified: 2017-12-14T10:25:00Z
extended-properties:Company:
modified: 2017-12-14T10:25:00Z
xmpTPg:NPages: 1
extended-properties:TotalTime: 57
dc:publisher:
Character Count: 167
meta:page-count: 1
meta:character-count-with-spaces: 195
Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document

补充:tika读取Excel里面的内容

例如一个Excel里面的内容:

    public static void test8() throws TikaException, SAXException, IOException {
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("G:/tikatest/user.xlsx"));
        ParseContext pcontext = new ParseContext();

        OOXMLParser msofficeparser = new OOXMLParser ();
        msofficeparser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
    } 

结果:

Contents of the document:Sheet1
序号 用户名字 用户电话 用户邮箱 用户账户 用户类型 密码
1 rrrrrr 15888585954 954318308@qq.com root111 管理员 111222
2 001 15898569856 qiao_liqiang@163.com 001 普通用户 111222
3 超级管理员 15898569856 5555@qq.com root8 管理员 111222
4 qqq 15898569856 qiao_liqiang@163.com 1231 普通用户 111222
5 张三 18558458569 33335658@qq.com 333 普通用户 111222
6 李四 15898569856 qiao_liqiang@163.com 4444 普通用户 111222
7 超级管理员 15898569856 5555@qq.com root5 管理员 111222
8 张三 18434391711 qiao_liqiang@163.com root7 管理员 111222
9 张三 18434391711 qiao_liqiang@163.com root3 管理员 111222
10 超管 15898569856 qiao_liqiang@163.com root 管理员 111222
11 8888 15898569856 qiao_liqiang@163.com 8888 普通用户 111222
12 超级管理员 15888585954 954318308@qq.com roo6 管理员 111222
13 张三 18434391711 qiao_liqiang@163.com root4 管理员 111222

1.7提取txt文档内容

    public static void test8() throws TikaException, SAXException, IOException {
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("G:/tikatest/test.txt"));
        ParseContext pcontext = new ParseContext();

        TXTParser msofficeparser = new TXTParser();
        msofficeparser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
        System.out.println("Metadata of the document:");
        String[] metadataNames = metadata.names();

        for(String name : metadataNames) {
            System.out.println(name + ": " + metadata.get(name));
        }

    }

1.8获取html

　　获取的是解析后的html,如果需要获取源码可以用IOUtils

    public static void test8() throws TikaException, SAXException, IOException {
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("G:/tikatest/index.html"));
        ParseContext pcontext = new ParseContext();

        HtmlParser msofficeparser = new HtmlParser();
        msofficeparser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
        System.out.println("Metadata of the document:");
        String[] metadataNames = metadata.names();

        for(String name : metadataNames) {
            System.out.println(name + ": " + metadata.get(name));
        }
    }

html内容如下:

结果:

Contents of the document:
Welcome to nginx!

If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.

For online documentation and support please refer to
nginx.org.

Commercial support is available at
nginx.com.

Thank you for using nginx.

Metadata of the document:
title: Welcome to nginx!
Content-Encoding: ISO-8859-1
Content-Type: text/html; charset=ISO-8859-1
dc:title: Welcome to nginx!

补充:FileUtils读取源码

    public static void test8() throws TikaException, SAXException, IOException {
        String s = FileUtils.readFileToString(new File("G:/tikatest/index.html"));
        System.out.println(s);
    }

结果:

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
         35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

1.9获取Class文件--可以实现反编译的功能。

反编译查看class文件内容:

tika提取class内容:(可以获取类的方法摘要信息)

    public static void test8() throws TikaException, SAXException, IOException {
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("G:/tikatest/UUIDUtil.class"));
        ParseContext pcontext = new ParseContext();

        ClassParser parser = new ClassParser();
        parser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
        System.out.println("Metadata of the document:");
        String[] metadataNames = metadata.names();

        for(String name : metadataNames) {
            System.out.println(name + ": " + metadata.get(name));
        }
    }

 结果:

Contents of the document:package cn.xm.jwxt.utils;
public synchronized class UUIDUtil {
public void UUIDUtil();
public static String getUUID();
public static String getUUID2();
}

Metadata of the document:
title: UUIDUtil
resourceName: UUIDUtil.class
dc:title: UUIDUtil

　　

1.10获取Jar文件 

 　　可以提取jar内部的class文件的概述信息以及元信息.这个可以用于列出一个文件下的所有的class信息或者写一个工具类查找一个某个class是否在某个jar文件中。

    public static void test8() throws TikaException, SAXException, IOException {
        BodyContentHandler handler = new BodyContentHandler(10*1024*1024);
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("G:/tikatest/t.jar"));
        ParseContext pcontext = new ParseContext();

        PackageParser parser = new PackageParser ();
        parser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
        System.out.println("Metadata of the document:");
        String[] metadataNames = metadata.names();

        for(String name : metadataNames) {
            System.out.println(name + ": " + metadata.get(name));
        }
    }

结果:

..........................

org/apache/tika/utils/ServiceLoaderUtils.class
package org.apache.tika.utils;
public synchronized class ServiceLoaderUtils {
public void ServiceLoaderUtils();
public static void sortLoadedClasses(java.util.List);
public static Object newInstance(String);
public static Object newInstance(String, ClassLoader);
}

org/apache/tika/utils/XMLReaderUtils$1.class
package org.apache.tika.utils;
final synchronized class XMLReaderUtils$1 implements org.xml.sax.EntityResolver {
void XMLReaderUtils$1();
public org.xml.sax.InputSource resolveEntity(String, String) throws org.xml.sax.SAXException, java.io.IOException;
}

org/apache/tika/utils/XMLReaderUtils$2.class
package org.apache.tika.utils;
final synchronized class XMLReaderUtils$2 implements javax.xml.stream.XMLResolver {
void XMLReaderUtils$2();
public Object resolveEntity(String, String, String, String) throws javax.xml.stream.XMLStreamException;
}

org/apache/tika/utils/XMLReaderUtils.class
package org.apache.tika.utils;
public synchronized class XMLReaderUtils {
private static final java.util.logging.Logger LOG;
private static final org.xml.sax.EntityResolver IGNORING_SAX_ENTITY_RESOLVER;
private static final javax.xml.stream.XMLResolver IGNORING_STAX_ENTITY_RESOLVER;
public void XMLReaderUtils();
public static org.xml.sax.XMLReader getXMLReader() throws org.apache.tika.exception.TikaException;
public static javax.xml.parsers.SAXParser getSAXParser() throws org.apache.tika.exception.TikaException;
public static javax.xml.parsers.SAXParserFactory getSAXParserFactory();
public static javax.xml.parsers.DocumentBuilderFactory getDocumentBuilderFactory();
public static javax.xml.parsers.DocumentBuilder getDocumentBuilder() throws org.apache.tika.exception.TikaException;
public static javax.xml.stream.XMLInputFactory getXMLInputFactory();
private static void trySetSAXFeature(javax.xml.parsers.DocumentBuilderFactory, String, boolean);
private static void tryToSetStaxProperty(javax.xml.stream.XMLInputFactory, String, boolean);
public static javax.xml.transform.Transformer getTransformer() throws org.apache.tika.exception.TikaException;
static void <clinit>();
}

org/apache/tika/utils/package-info.class
package org.apache.tika.utils;
abstract interface package-info {
}

Metadata of the document:
Content-Type: application/zip

补充:在没设置BodyContentHandler参数的时候读取报错如下:

Exception in thread "main" org.apache.tika.sax.WriteOutContentHandler$WriteLimitReachedException: Your document contained more than 100000 characters, and so your requested limit has been reached. To receive the full text of the document, increase your limit. (Text up to the limit is however available).
    at org.apache.tika.sax.WriteOutContentHandler.characters(WriteOutContentHandler.java:141)
    at org.apache.tika.sax.ContentHandlerDecorator.characters(ContentHandlerDecorator.java:146)
    at org.apache.tika.sax.xpath.MatchingContentHandler.characters(MatchingContentHandler.java:85)

解决办法就是设置读取的参数:

BodyContentHandler handler = new BodyContentHandler(10*1024*1024);

1.11提取图像信息:

    public static void test8() throws TikaException, SAXException, IOException {
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("g:/tikatest/5.jpeg"));
        ParseContext pcontext = new ParseContext();
        
        JpegParser  JpegParser = new JpegParser();
        JpegParser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
        System.out.println("Metadata of the document:");
        String[] metadataNames = metadata.names();
        
        for(String name : metadataNames) {                 
           System.out.println(name + ": " + metadata.get(name));
        }
    }

结果:

Contents of the document:
Metadata of the document:
Number of Tables: 4 Huffman tables
Number of Components: 3
Image Height: 192 pixels
Resolution Units: inch
File Name: apache-tika-7234240523307196989.tmp
Data Precision: 8 bits
File Modified Date: 星期三 十月 17 21:43:39 +08:00 2018
tiff:BitsPerSample: 8
Compression Type: Baseline
Component 1: Y component: Quantization table 0, Sampling factors 2 horiz/2 vert
Component 2: Cb component: Quantization table 1, Sampling factors 1 horiz/1 vert
tiff:ImageLength: 192
Component 3: Cr component: Quantization table 1, Sampling factors 1 horiz/1 vert
X Resolution: 96 dots
File Size: 9216 bytes
tiff:ImageWidth: 256
Thumbnail Height Pixels: 0
Thumbnail Width Pixels: 0
Image Width: 256 pixels
Y Resolution: 96 dots

1.12提取Mp4信息

    public static void test8() throws TikaException, SAXException, IOException {
        BodyContentHandler handler = new BodyContentHandler();
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File("g:/tikatest/test.mp4"));
        ParseContext pcontext = new ParseContext();
        
        MP4Parser MP4Parser = new MP4Parser();
        MP4Parser.parse(inputstream, handler, metadata,pcontext);
        System.out.println("Contents of the document:" + handler.toString());
        System.out.println("Metadata of the document:");
        String[] metadataNames = metadata.names();
        
        for(String name : metadataNames) {                 
           System.out.println(name + ": " + metadata.get(name));
        }
    }

结果:

Contents of the document:
Metadata of the document:
dcterms:modified: 2017-07-20T10:25:23Z
xmpDM:duration: 39.5
meta:creation-date: 2017-07-20T10:25:23Z
meta:save-date: 2017-07-20T10:25:23Z
Last-Modified: 2017-07-20T10:25:23Z
dcterms:created: 2017-07-20T10:25:23Z
xmpDM:audioSampleRate: 10000
date: 2017-07-20T10:25:23Z
tiff:ImageLength: 578
modified: 2017-07-20T10:25:23Z
Creation-Date: 2017-07-20T10:25:23Z
tiff:ImageWidth: 442
Content-Type: video/mp4
Last-Save-Date: 2017-07-20T10:25:23Z

补充:有时候读取的文件内容太大的时候需要设置参数，如下:(用于读取大文件)

BodyContentHandler handler = new BodyContentHandler(10*1024*1024);

 总结:

 　　至此，apacheTika基本用法已经使用完毕，tika不能获取word,pdf等文件中的图片。但是可以解析文件中的文字，常见文件的内容都是可以提取的。在某些场景下也是有用途的。比如做文件服务器的时候可以将内容提取出来保存到数据库或者保存到文件中，利用solr或者数据库的查询进行模糊搜索。

　　tika在提取html、office等文件之后是提取里面的文字，有时候提取源码可以用FileUtils，最好两者结合使用。

　　有时间可以用swing做一个基于apachetika查找文件内容和查找文件class的工具类，类似于everything，做的好一点比everything更好一点可以读取里面的内容。这只是一个思路。。。。。有时间再慢慢实现。