9

我需要挖掘大多数已知文档文件的内容,例如:

  1. pdf
  2. html
  3. doc/docx 等

对于我计划使用的大多数这些文件格式:

http://tika.apache.org/

但截至目前Tika不支持 MHTML (*.mht) 文件.. ( http://en.wikipedia.org/wiki/MHTML ) C# 中的示例很少 ( http://www.codeproject.com/KB/ files/MhtBuilder.aspx),但我在 Java 中没有找到。

我尝试在 7Zip 中打开 *.mht 文件,但它失败了......尽管 WinZip 能够将文件解压缩为图像和文本(CSS、HTML、脚本)作为文本和二进制文件......

根据 MSDN 页面(http://msdn.microsoft.com/en-us/library/aa767785%28VS.85%29.aspx#compress_content)和code project我之前提到的页面...... mht 文件使用 GZip 压缩...... .

尝试在 java 中解压缩会导致以下异常:java.uti.zip.GZIPInputStream

java.io.IOException: Not in GZIP format
at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
at java.util.zip.GZIPInputStream.<init>(Unknown Source)
at java.util.zip.GZIPInputStream.<init>(Unknown Source)
at GZipTest.main(GZipTest.java:16)

java.util.zip.ZipFile

 java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.zip.ZipFile.<init>(Unknown Source)
at GZipTest.main(GZipTest.java:21)

请高手指点解压方法....

谢谢....

4

6 回答 6

13

坦率地说,我并没有期待在不久的将来有解决方案并且即将放弃,但是我偶然发现了这个页面:

http://en.wikipedia.org/wiki/MIME#Multipart_messages

http://msdn.microsoft.com/en-us/library/ms527355%28EXCHG.10%29.aspx

虽然,乍一看不是很吸引人。但如果你仔细看,你会得到线索。读完这篇文章后,我启动了我的 IE 并随机开始将页面保存为*.mht文件。让我一行一行...

但是让我事先解释一下,我的最终目标是分离/提取html内容并解析它......解决方案本身并不完整,因为它取决于我在保存时选择的character setencoding。但即使它会提取单个文件,但会遇到一些小问题......

我希望这对尝试解析/解压缩文件的人有用*.mht/MHTML:)

======= 解释 ======== ** 取自 mht 文件 **

From: "Saved by Windows Internet Explorer 7"

它是用于保存文件的软件

Subject: Google
Date: Tue, 13 Jul 2010 21:23:03 +0530
MIME-Version: 1.0

主题、日期和 mime 版本……很像邮件格式

  Content-Type: multipart/related;
type="text/html";

这是告诉我们它是一个multipart文件的部分。多部分文档将一组或多组不同的数据组合在一个正文中,multipartContent-Type 字段必须出现在实体的标题中。在这里,我们也可以看到类型为"text/html"

boundary="----=_NextPart_000_0007_01CB22D1.93BBD1A0"

在所有这些中,这是最重要的部分。这是分隔两个不同部分(html、图像、css、脚本等)的唯一分隔符。一旦你掌握了这一点,一切都会变得容易......现在,我只需要遍历文档并找出不同的部分并根据它们的Content-Transfer-Encoding(base64,quoted-printable 等)保存它们......。. .

样本

 ------=_NextPart_000_0007_01CB22D1.93BBD1A0
 Content-Type: text/html;
 charset="utf-8"
 Content-Transfer-Encoding: quoted-printable
 Content-Location: http://www.google.com/webhp?sourceid=navclient&ie=UTF-8

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" =
.
.
.

** JAVA代码**

用于定义常量的接口。

public interface IConstants 
{
    public String BOUNDARY = "boundary";
    public String CHAR_SET = "charset";
    public String CONTENT_TYPE = "Content-Type";
    public String CONTENT_TRANSFER_ENCODING = "Content-Transfer-Encoding";
    public String CONTENT_LOCATION = "Content-Location";

    public String UTF8_BOM = "=EF=BB=BF";

    public String UTF16_BOM1 = "=FF=FE";
    public String UTF16_BOM2 = "=FE=FF";
}

主要的解析器类...

/**
 * This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package com.test.mht.core;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.OutputStreamWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import sun.misc.BASE64Decoder;

/**
 * File to parse and decompose *.mts file in its constituting parts.
 * @author Manish Shukla 
 */

public class MHTParser implements IConstants
{
    private File mhtFile;
    private File outputFolder;

    public MHTParser(File mhtFile, File outputFolder) {
        this.mhtFile = mhtFile;
        this.outputFolder = outputFolder;
    }

    /**
     * @throws Exception
     */
    public void decompress() throws Exception
    {
        BufferedReader reader = null;

        String type = "";
        String encoding = "";
        String location = "";
        String filename = "";
        String charset = "utf-8";
        StringBuilder buffer = null;

        try
        {
            reader = new BufferedReader(new FileReader(mhtFile));

            final String boundary = getBoundary(reader);
            if(boundary == null)
                throw new Exception("Failed to find document 'boundary'... Aborting");

            String line = null;
            int i = 1;
            while((line = reader.readLine()) != null)
            {
                String temp = line.trim();
                if(temp.contains(boundary)) 
                {
                    if(buffer != null) {
                        writeBufferContentToFile(buffer,encoding,filename,charset);
                        buffer = null;
                    }

                    buffer = new StringBuilder();
                }else if(temp.startsWith(CONTENT_TYPE)) {
                    type = getType(temp);
                }else if(temp.startsWith(CHAR_SET)) {
                    charset = getCharSet(temp);
                }else if(temp.startsWith(CONTENT_TRANSFER_ENCODING)) {
                    encoding = getEncoding(temp);
                }else if(temp.startsWith(CONTENT_LOCATION)) {
                    location = temp.substring(temp.indexOf(":")+1).trim();
                    i++;
                    filename = getFileName(location,type);
                }else {
                    if(buffer != null) {
                        buffer.append(line + "\n");
                    }
                }
            }

        }finally 
        {
            if(null != reader)
                reader.close();
        }

    }

    private String getCharSet(String temp) 
    {
        String t = temp.split("=")[1].trim();
        return t.substring(1, t.length()-1);
    }

    /**
     * Save the file as per character set and encoding 
     */
    private void writeBufferContentToFile(StringBuilder buffer,String encoding, String filename, String charset) 
    throws Exception
    {

        if(!outputFolder.exists())
            outputFolder.mkdirs();

        byte[] content = null; 

        boolean text = true;

        if(encoding.equalsIgnoreCase("base64")){
            content = getBase64EncodedString(buffer);
            text = false;
        }else if(encoding.equalsIgnoreCase("quoted-printable")) {
            content = getQuotedPrintableString(buffer);         
        }
        else
            content = buffer.toString().getBytes();

        if(!text)
        {
            BufferedOutputStream bos = null;
            try
            {
                bos = new BufferedOutputStream(new FileOutputStream(filename));
                bos.write(content);
                bos.flush();
            }finally {
                bos.close();
            }
        }else 
        {
            BufferedWriter bw = null;
            try
            {
                bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filename), charset));
                bw.write(new String(content));
                bw.flush();
            }finally {
                bw.close();
            }
        }
    }

    /**
     * When the save the *.mts file with 'utf-8' encoding then it appends '=EF=BB=BF'</br>
     * @see http://en.wikipedia.org/wiki/Byte_order_mark
     */
    private byte[] getQuotedPrintableString(StringBuilder buffer) 
    {
        //Set<String> uniqueHex = new HashSet<String>();
        //final Pattern p = Pattern.compile("(=\\p{XDigit}{2})*");

        String temp = buffer.toString().replaceAll(UTF8_BOM, "").replaceAll("=\n", "");

        //Matcher m = p.matcher(temp);
        //while(m.find()) {
        //  uniqueHex.add(m.group());
        //}

        //System.out.println(uniqueHex);

        //for (String hex : uniqueHex) {
            //temp = temp.replaceAll(hex, getASCIIValue(hex.substring(1)));
        //}     

        return temp.getBytes();
    }

    /*private String getASCIIValue(String hex) {
        return ""+(char)Integer.parseInt(hex, 16);
    }*/
    /**
     * Although system dependent..it works well
     */
    private byte[] getBase64EncodedString(StringBuilder buffer) throws Exception {
        return new BASE64Decoder().decodeBuffer(buffer.toString());
    }

    /**
     * Tries to get a qualified file name. If the name is not apparent it tries to guess it from the URL.
     * Otherwise it returns 'unknown.<type>'
     */
    private String getFileName(String location, String type) 
    {
        final Pattern p = Pattern.compile("(\\w|_|-)+\\.\\w+");
        String ext = "";
        String name = "";
        if(type.toLowerCase().endsWith("jpeg"))
            ext = "jpg";
        else
            ext = type.split("/")[1];

        if(location.endsWith("/")) {
            name = "main";
        }else
        {
            name = location.substring(location.lastIndexOf("/") + 1);

            Matcher m = p.matcher(name);
            String fname = "";
            while(m.find()) {
                fname = m.group();
            }

            if(fname.trim().length() == 0)
                name = "unknown";
            else
                return getUniqueName(fname.substring(0,fname.indexOf(".")), fname.substring(fname.indexOf(".") + 1, fname.length()));
        }
        return getUniqueName(name,ext);
    }

    /**
     * Returns a qualified unique output file path for the parsed path.</br>
     * In case the file already exist it appends a numarical value a continues
     */
    private String getUniqueName(String name,String ext)
    {
        int i = 1;
        File file = new File(outputFolder,name + "." + ext);
        if(file.exists())
        {
            while(true)
            {
                file = new File(outputFolder, name + i + "." + ext);
                if(!file.exists())
                    return file.getAbsolutePath();
                i++;
            }
        }

        return file.getAbsolutePath();
    }

    private String getType(String line) {
        return splitUsingColonSpace(line);
    }

    private String getEncoding(String line){
        return splitUsingColonSpace(line);
    }

    private String splitUsingColonSpace(String line) {
        return line.split(":\\s*")[1].replaceAll(";", "");
    }

    /**
     * Gives you the boundary string
     */
    private String getBoundary(BufferedReader reader) throws Exception 
    {
        String line = null;

        while((line = reader.readLine()) != null)
        {
            line = line.trim();
            if(line.startsWith(BOUNDARY)) {
                return line.substring(line.indexOf("\"") + 1, line.lastIndexOf("\""));
            }
        }

        return null;
    }
}

问候,

于 2010-07-13T16:51:29.053 回答
2

你不必自己做。

有依赖

<dependency>
    <groupId>org.apache.james</groupId>
    <artifactId>apache-mime4j</artifactId>
    <version>0.7.2</version>
</dependency>

滚动你的 mht 文件

public static void main(String[] args)
{
    MessageTree.main(new String[]{"YOU MHT FILE PATH"});
}

MessageTree将要

/**
 * Displays a parsed Message in a window. The window will be divided into
 * two panels. The left panel displays the Message tree. Clicking on a
 * node in the tree shows information on that node in the right panel.
 *
 * Some of this code have been copied from the Java tutorial's JTree section.
 */

然后你可以调查一下。

;-)

于 2015-03-03T08:50:01.817 回答
2

使用 Java Mail API 的更紧凑的代码

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.net.URL;
import java.util.Properties;

import javax.mail.BodyPart;
import javax.mail.Session;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

import org.apache.commons.io.IOUtils;

public class MhtParser {

    private File mhtFile;
    private File outputFolder;

    public MhtParser(File mhtFile, File outputFolder) {
        this.mhtFile = mhtFile;
        this.outputFolder = outputFolder;
    }

    public void decompress() throws Exception {
        MimeMessage message = 
            new MimeMessage(
                    Session.getDefaultInstance(new Properties(), null),
                    new FileInputStream(mhtFile));

        if (message.getContent() instanceof MimeMultipart) {
            outputFolder.mkdir();
            MimeMultipart mimeMultipart = (MimeMultipart) message.getContent();

            for (int i = 0; i < mimeMultipart.getCount(); i++) {
                BodyPart bodyPart = mimeMultipart.getBodyPart(i);
                String fileName = bodyPart.getFileName();

                if (fileName == null) {
                    String[] locationHeader = bodyPart.getHeader("Content-Location");
                    if (locationHeader != null && locationHeader.length > 0) {
                        fileName = 
                            new File(new URL(locationHeader[0]).getFile()).getName();
                    }
                }

                if (fileName != null) {
                    FileOutputStream out = 
                        new FileOutputStream(new File(outputFolder, fileName));

                    IOUtils.copy(bodyPart.getInputStream(), out);
                    out.flush();
                    out.close();
                }
            }
        }
    }
}
于 2019-10-30T10:31:22.477 回答
0

我使用http://jtidy.sourceforge.net来解析/读取/索引 mht 文件(但作为普通文件,不是压缩文件)

于 2010-07-12T19:47:14.297 回答
0

你可以试试http://www.chilkatsoft.com/mht-features.asp,它可以打包/解包,你可以像普通文件一样处理它。下载链接为: http: //www.chilkatsoft.com/java.asp

于 2010-07-12T16:46:52.270 回答
0

派对迟到了,但扩展了@wener对其他任何偶然发现此问题的人的回答。

Apache Mime4J库似乎为EML 或 MHTML处理提供了最容易访问的解决方案,比自己滚动要容易得多!

我下面的原型“ parseMhtToFile”函数从 Cognos 活动报告“mht”文件中提取 html 文件和其他工件,但可以针对其他目的进行定制。

这是用 Groovy 编写的,需要Apache Mime4J 'core' 和 'dom' jars(当前为 0.7.2)。

import org.apache.james.mime4j.dom.Message
import org.apache.james.mime4j.dom.Multipart
import org.apache.james.mime4j.dom.field.ContentTypeField
import org.apache.james.mime4j.message.DefaultMessageBuilder
import org.apache.james.mime4j.stream.MimeConfig

/**
 * Use Mime4J MessageBuilder to parse an mhtml file (assumes multipart) into
 * separate html files.
 * Files will be written to outDir (or parent) as baseName + partIdx + ext.
 */
void parseMhtToFile(File mhtFile, File outDir = null) {
    if (!outDir) {outDir = mhtFile.parentFile }
    // File baseName will be used in generating new filenames
    def mhtBaseName = mhtFile.name.replaceFirst(~/\.[^\.]+$/, '')

    // -- Set up Mime parser, using Default Message Builder
    MimeConfig parserConfig  = new MimeConfig();
    parserConfig.setMaxHeaderLen(-1); // The default is a mere 10k
    parserConfig.setMaxLineLen(-1); // The default is only 1000 characters.
    parserConfig.setMaxHeaderCount(-1); // Disable the check for header count.
    DefaultMessageBuilder builder = new DefaultMessageBuilder();
    builder.setMimeEntityConfig(parserConfig);

    // -- Parse the MHT stream data into a Message object
    println "Parsing ${mhtFile}...";
    InputStream mhtStream = mhtFile.newInputStream()
    Message message = builder.parseMessage(mhtStream);

    // -- Process the resulting body parts, writing to file
    assert message.getBody() instanceof Multipart
    Multipart multipart = (Multipart) message.getBody();
    def parts = multipart.getBodyParts();
    parts.eachWithIndex { p, i ->
        ContentTypeField cType = p.header.getField('content-type')
        println "${p.class.simpleName}\t${i}\t${cType.mimeType}"

        // Assume mime sub-type is a "good enough" file-name extension 
        // e.g. text/html = html, image/png = png, application/json = json
        String partFileName = "${mhtBaseName}_${i}.${cType.subType}"
        File partFile = new File(outDir, partFileName)

        // Write part body stream to file
        println "Writing ${partFile}...";
        if (partFile.exists()) partFile.delete();
        InputStream partStream = p.body.inputStream;
        partFile.append(partStream);
    }
}

用法很简单:

File mhtFile = new File('<path>', 'Report-en-au.mht')
parseMhtToFile(mhtFile)
println 'Done.'

输出是:

Parsing <path>\Report-en-au.mht...
BodyPart    0   text/html
Writing <path>\Report-en-au_0.html...
BodyPart    1   image/png
Writing <path>\Report-en-au_1.png...
Done.

关于其他改进的想法:

  • 对于“文本”mime 部分,您可以访问 aReader而不是 a Stream,这可能更适合 OP 要求的文本挖掘。

  • 对于生成的文件扩展名,我会使用另一个库来查找适当的扩展名,而不是假设 mime 子类型就足够了。

  • 处理单体(非多部分)和递归多部分 mhtml 文件和其他复杂性。这些可能需要具有自定义内容处理程序实现的MimeStreamParser

于 2016-04-12T08:02:27.650 回答