我遇到了问题，我想使用包含电子邮件标题详细信息的txt文件。使用Java我想在该文本中搜索特定的标签，并打印该标签的详细信息。
------------------------EXAMPLE OF HEADER FILE-----------------
Return-Path: <example_from@dc.edu>
X-SpamCatcher-Score: 1 [X]
Received: from [136.167.40.119] (HELO dc.edu)
by fe3.dc.edu (CommuniGate Pro SMTP 4.1.8)
with ESMTP-TLS id 61258719 for example_to@mail.dc.edu; Mon, 23 Aug 2004 11:40:10 -0400
Message-ID: <4129F3CA.2020509@dc.edu>
Date: Mon, 23 Aug 2005 11:40:36 -0400
From: Taylor Evans <example_from@dc.edu>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.1)
Gecko/2002082Netscape/7.0
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Jon Smith <example_to@mail.dc.edu>
Subject: Business Development Meeting
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit'
-----------------------------------XXX-----------------------
在上面的示例中，有一个名为＆＃34; subject＆＃34;的标签。我想打印那个标签及其细节，
例如：Subject:Business Development Meeting，输出中。
答案 0 :(得分：0)
try {
BufferedReader reader = new BufferedReader(new FileReader("File.txt"));
String s=null;
try {
while((s=reader.readLine()) != null)
{
if(s.contains("Subject"))
{
System.out.println(s.substring(12));
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
答案 1 :(得分：0)
请找一个非常简单的解决方案..
import java.io.BufferedReader;
import java.io.FileReader;
public class FileReader1 {
static public void main( String args[] ) throws Exception
{
try(BufferedReader br = new BufferedReader(new FileReader("E:\\Software\\Jyoti_WorkSpace\\Test\\src\\sample4.txt"))) {
String line = br.readLine();
while (line != null) {
line = br.readLine();
if (line!=null){
String output[]= line.split(":");
if(output.length>1)
System.out.println(output[0] +"--> "+ output[1]);
}
}
}
}
}
Message-ID--> <4129F3CA.2020509@dc.edu>
Date--> Mon, 23 Aug 2005 11
From--> Taylor Evans <example_from@dc.edu>
User-Agent--> Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv
X-Accept-Language--> en-us, en
MIME-Version--> 1.0
To--> Jon Smith <example_to@mail.dc.edu>
Subject--> Business Development Meeting
Content-Type--> text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding--> 7bit'
答案 2 :(得分：0)
假设你已经编辑了一个你的txt文件：
Return-Path: <example_from@dc.edu>
X-SpamCatcher-Score: 1 [X]
Received: from [136.167.40.119] (HELO dc.edu)
By: fe3.dc.edu (CommuniGate Pro SMTP 4.1.8)
With: ESMTP-TLS id 61258719
For: example_to@mail.dc.edu; Mon, 23 Aug 2004 11:40:10 -0400
Message-ID: <4129F3CA.2020509@dc.edu>
Date: Mon, 23 Aug 2005 11:40:36 -0400
From: Taylor Evans <example_from@dc.edu>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.1) Gecko/2002082Netscape/7.0
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Jon Smith <example_to@mail.dc.edu>
Subject: Business Development Meeting
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit'
......你知道它的路径。比，您可以进行简单的while迭代，同时检查当前阅读行是否以特定String值开头。例如，您想要显示一行，其中以“主题：”文本开头。在这种情况下，请查看下面的示例并根据您的需要重新排列。
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
public class SearchTxtDemo {
public static void main(String args[]) {
/* declare and initialize reader for reading values from the console */
BufferedReader consoleReader = new BufferedReader(new InputStreamReader(System.in));
/* prompt text for the user so he/she can decide, value of which tag should be displayed */
System.out.println("Number + ENTER for getting value of specific tag:");
String[] tags = new String[] {"Return-Path [0]", "X-SpamCatcher-Score [1]", "Received [2]",
"By [3]", "With [4]", "For [5]", "Message-ID [6]", "Date [7]", "From [8]", "User-Agent [9]",
"X-Accept-Language [10]", "MIME-Version [11]", "To [12]", "Subject [13]", "Content-Type [14]",
"Content-Transfer-Encoding [15]"};
for (String i : tags) {
System.out.println(i);
}
/* get value given by the user */
int valueGivenByUser = -1;
try {
valueGivenByUser = Integer.parseInt(consoleReader.readLine());
consoleReader.close();
} catch (IOException e1) {
e1.printStackTrace();
}
/* cut the value given by the user by the whitespace, e.g "space" */
String[] searchForTag = tags[valueGivenByUser].split("\\s");
/* declare reader for the file with Your data */
BufferedReader filereader;
try {
/* initialize file reader */
filereader = new BufferedReader(new InputStreamReader(
new FileInputStream("D:/Eclipse Java 8/eclipse_workspace/SampleText/src/SampleText.txt")));
/* read the file in the iteration manner, */
/* until reader will reach the end of the file */
String line;
while ((line = filereader.readLine()) != null) {
/* check if readed line begins with the tag chosen by the user */
/* if it matches, than show whole readed line in the console */
if (line.startsWith(searchForTag[0])) {
System.out.println(line);
break;
}
}
filereader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
答案 3 :(得分：0)
试试这个。这样您就可以将行Subject: Business Development Meeting存储在字符串subjectDetails中。
Scanner in = null;
string subjectDetails;
try {
in = new Scanner(new FileInputStream("file.txt"));//use w/e source for input
} catch (FileNotFoundException e) {
System.exit(0);
e.printStackTrace();
}
while(in.hasNextLine(){
String line = in.nextLine()
if(new Scanner(line).next().equals("Subject:"))
subjectDetails = line;
}
请注意，如果您指定文件new FileInputStream("file.txt")，那么该文件必须放在项目目录中。否则，您可以为其指定绝对路径。
希望这有帮助