如何在Java中读取或解析MHTML（.mht）文件
我需要挖掘大多数已知文档文件的 ，例如：
- pdf格式
- html
- doc / docx等
对于大多数这些文件格式，我计划使用：
http://tika.apache.org/
但截至目前，Tika它不支持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），但在Java中找不到任何文件。
我试图在7Zip中打开*
.mht文件，但失败了…尽管WinZip能够将文件解压缩为图像和文本（CSS，HTML，Script），作为文本和二进制文件…
根据MSDN页面（http://msdn.microsoft.com/zh-
cn/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：With java.uti.zip.GZIPInputStream
java.io.IOException: Not in GZIP formatat 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)
与 java.util.zip.ZipFile
java.util.zip.ZipException: error in opening zip fileat 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)
请提出如何解压缩它。
谢谢....
回答：
坦白说，我没想到会在不久的将来找到解决方案，而我打算放弃，但是我在此页面上偶然发现了一些：
http://en.wikipedia.org/wiki/MIME#Multipart_messages
http://msdn.microsoft.com/zh-
cn/library/ms527355%28EXCHG.10%29.aspx
虽然，乍一看不是很吸引人。但是，如果仔细看，您会得到线索。阅读此内容后，我启动了IE，并随机开始将页面另存为*.mht文件。让我逐行走…
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，因为它取决于保存时选择的character
set或encoding。但是即使它会以较小的麻烦提取单个文件…
我希望这对于任何试图解析/解压缩*.mht/MHTML文件的人都是有用的:)
=======说明========
From: "Saved by Windows Internet Explorer 7"它是用于保存文件的软件
Subject: GoogleDate: Tue, 13 Jul 2010 21:23:03 +0530
MIME-Version: 1.0
主题，日期和哑剧版本……类似于邮件格式
Content-Type: multipart/related;type="text/html";
这部分告诉我们这是一个multipart文档。包含多部分的文档将一个或多个不同的数据集组合在一个正文中，因此multipartContent-
Type字段必须出现在实体的标题中。在这里，我们还可以看到类型为"text/html"。
boundary="----=_NextPart_000_0007_01CB22D1.93BBD1A0"这是最重要的部分。这是唯一的分隔符，它分为两个不同的部分（html，图像，css，脚本等）。
掌握了这一点，一切都变得很容易…现在，我只需要遍历文档并找出不同的部分，并根据它们的内容Content-Transfer-
Encoding（base64，quoted-printable等）保存它们。。。
------=_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" =
.
.
.
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，
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