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POJava Parsing HTTP text file format
 

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  1. POJava Parsing HTTP text file format
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    <p>I am new to java just learned it this week, my teacher want me parse a HTTP request saved in text file format. Basically he wanted me to extract<br> just this line "GET /fenway/ HTTP/1.0\r\n" and this "Host: www.redsox.com\r\n" and save it in a text format. My program doesn't work well yet as it contains error. What I did was to read a text file line by line and then enter it in to a function that tries to read the buffer and tokenizes each word and saves it to copyGetWord, then running a while loop to detect if the word "GET" is found it will store getWord to an arraylist.</p> <p>Another thing is that am only allowed to use java for this no perl or python. Also I have tried jnetpcap libraries but have problem installing them so am stuck with text files.</p> <p>Hope anyone can help. </p> <h2>this is a sample text file:</h2> <p>Transmission Control Protocol, Src Port: bridgecontrol (1073), Dst Port: http (80), Seq: 1, Ack: 1, Len: 270 Hypertext Transfer Protocol GET /azur/ HTTP/1.0\r\n Connection: Keep-Alive\r\n User-Agent: Mozilla/4.08 [en] (WinNT; I)\r\n Host: www.google.com\r\n</p> <pre><code>public static void main(String[] args) { System.out.println("Tries to read the samplepcap1.txt, \n"); ReadingFile1 handle = new ReadingFile1(); ArrayList &lt;String&gt; StoreLine = new ArrayList&lt;String&gt;(); try{ FileReader ReadPcap = new FileReader("samplePcapSmall.txt"); BufferedReader bufferPcap = new BufferedReader(ReadPcap); String readBufLine = bufferPcap.readLine(); StoreLine.add(readBufLine); while (readBufLine!=null){ readBufLine = bufferPcap.readLine(); handle.LookForWord(readBufLine); } bufferPcap.close(); } catch (FileNotFoundException e){ System.out.println("\nFile not found"); } catch (IOException e){ System.out.println("Problem reading the file.\n"); } } public String LookForWord(String getWord){ ArrayList &lt;String&gt;MatchingWord = new ArrayList&lt;String&gt;(); StringTokenizer copyGetWord = new StringTokenizer(getWord," "); while (copyGetWord.hasMoreElements()){ if(copyGetWord.nextToken().matches("GET")){ MatchingWord.add(getWord); } } System.out.println("\nMatch: "+MatchingWord); return getWord; } </code></pre> <p>Tries to read the samplepcap1.txt, stores in an ArrayList and Displays ArrayList</p> <pre><code>Match: [] Match: [ GET /fenway/ HTTP/1.0\r\n] Match: [] Match: [] Match: [] Exception in thread "main" java.lang.NullPointerException at java.util.StringTokenizer.&lt;init&gt;(StringTokenizer.java:182) at java.util.StringTokenizer.&lt;init&gt;(StringTokenizer.java:204) at readingfile1.ReadingFile1.LookForWord(ReadingFile1.java:84) at readingfile1.ReadingFile1.main(ReadingFile1.java:62) Java Result: 1 BUILD SUCCESSFUL (total time: 1 second) </code></pre>
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      1. USThomas
 

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