How To Manually Put Data Into InputStream

Aug 23, 2014

I am new to programming in regards to I/O, channels, SSH, etc...

At the moment I am trying to transform the Shell.java program from the JCraft JSch examples; JSch - Java Secure Channel - Examples

The way in which I am trying to transform it is by instead of having the character input go into the channel automatically from the keyboard (refer to line 77 in Shell.java), I just want to pro-grammatically insert characters in to the channel at my discretion, so for example I have a string called unixCommand that I want to insert into the channel, and I don't want there to be any other way of inserting into the channel such as the standard input stream, so for example I'd have the statement <insert unixCommand to UNIX box at other side of channel> inserted somewhere after line 100 in Shell.java.

I was thinking that maybe I have to use some other InputStream object at line 77 when setting the channels input stream instead of System.in, but I am not sure how to do this (but really I'm not sure if I'm even on the right tracks?). I believe all this confusion may be down to a misunderstanding with the general concepts involved with channels and I/O ...

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How To Manually Put Data Into InputStream

Aug 23, 2014

I am trying to transform the Shell.java program from the JCraft JSch examples : [URL] ....

The way in which I am trying to transform it is by instead of having the character input go into the channel automatically from the keyboard (refer to line 77 in Shell.java), I just want to pro-grammatically insert characters in to the channel at my discretion, so for example I have a string called unixCommand that I want to insert into the channel, and I don't want there to be any other way of inserting into the channel such as the standard input stream, so for example I'd have the statement <insert unixCommand to UNIX box at other side of channel> inserted somewhere after line 100 in Shell.java.

I was thinking that maybe I have to use some other InputStream object at line 77 when setting the channels input stream instead of System.in, but I am not sure how to do this (but really I'm not sure if I'm even on the right tracks?). I believe all this confusion may be down to a misunderstanding with the general concepts involved with channels and I/O.

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Difference Between InputStream And InputStreamReader

Jul 11, 2014

I read that InputStream is used for byte based reading it reads 1 byte at a time.And InputStreamReader is used for charcter based reading so it reads one charcter at a time so no need to convert this first to int then read it.Here is reading using InputStream.

input=new FileInputStream("D:/input.txt");
int c;
while((c=input.read())!=-1)
{
System.out.print((char)c);
}

and here is reading using InputStreamReader

input=new FileInputStream("D:/input.txt");
reader=new InputStreamReader(input,"UTF-8");
int c;

while((c=reader.read())!=-1)
{
System.out.print((char)c);
}

so what is difference between InputStream and InputStreamReader in both case i have to use a Int and then read it and at the end if I want to print that data I have to cast that with "(char)c".So what is advantage of using InputStreamReader?

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Feb 26, 2014

I'm writing a really simple 1 on 1 chatting program thing using java.net.Socket and reading each other's messages b using writeUTF() and readUTF() of java.io.DataOutputStream and java.io.DataInputStream. Thing is, I wanna write a thread for both sides to continuously read from their respective socket's input streams while ignoring the lack of data coming through like when one user is not sending a message or something. I've written a dumbed down version of this that only reads one message from only one side and another one that sends a file, both of which work fine, I guess.

I'm using java.util.Scanner for user input, if that's acceptable, for I am not too familiar with Java's other readers. Also, I just started teaching myself about java.net.Socket, so I may not be too familiar other than the basics like how to set up a connection and how to send data using the getOutputStream() member function and stuff like that.

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Jun 27, 2014

I had a Rest web service call and get InputStream.Now i want to Write Input Stream to PrintWriter of servlet.So that it can be downloaded.I am able to write String and file can be downloaded using following code, i want it to work for Input streamFollowing is code:

response.setContentType("application/x-download");
response.setHeader("Content-Disposition", "attachment; filename="" + name + ".pdf"");
response.getWriter().write(is);

Write can take following:
write(String)
write(char[])
write(int)
write(String, int len, int off)
write(char[], int len, int off)

I think char[] will not harm PDF file which is going to download in it

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Dec 4, 2014

I have upgraded to myeclipse 10.7 ,java "com.sun.java.jdk.win32.x86_64_1.6.0.013" and Struts 2.1 (Right now using Struts 1.1 support) from myeclipse 10.7 ,java 1.4 and Struts 1.1. I installed jasperassistant 2.4.2 plug-in using jasperReports 2.0.2 (My old report files were using same version).

All files compile successfully in new environment but when I export I get following error Export to PDF

a. Reports having no crosstab
"Java.lang.NullPointerException"

b. Reports reports having crosstab
"Error loading object from InputStream"
java.io.InvalidClassException: net.sf.jasperreports.crosstabs.base.JRBaseCrosstabGroup;

Export to EXCEL

a. Reports having no crosstab
java.lang.NullPointerException

b.Reports reports having crosstab
java.lang.NullPointerException

All files are at correct location....

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May 7, 2014

For some reason, when I generate a Javadoc (using javadoc.exe of JDK 8), it displays Java-defined classes like java.lang.String and java.lang.Object by their full names rather than simply String or Object. Only the classes inside the packaged contents were represented by their simple names and linked to them (had visible coloured bolding). Was I supposed to manually include the Java API?

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Feb 20, 2014

I just wrote a small but working code to parse a multipart message with two files binary encoded.

Problem is, after splitting the content of the files is reduced to normal "alphabetic" digits, and i dont know why.

I just appended my source code and a test file ( multipart ). And the result of my parsing. (part_0 = json, part_1 = file, part_2 = file)

Unfortunately, i dont know, if the Spring FW provides an easier way of doing so at all. Haven't found it yet.

Java Code:

String requestUrl = "http://localhost:8888/";
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new ByteArrayHttpMessageConverter());
HttpEntity<String> entity = new HttpEntity<String>("test");
ResponseEntity<byte[]> response = restTemplate.exchange(requestUrl, HttpMethod.GET, entity, byte[].class);

[Code] .....

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Jun 22, 2014

My homework assignment is to create a program that reads two military times and then prints out the elapsed time. I've got all that down and ready to go but then the other part of this project is to have it loop until it is terminated manually. So at the end where it asks for a 'Y' or 'N' input answer is where I know i need to implement a do-while loop or switch statement, I'm not sure. how to make the application repeat until told to quit.

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Manually Add Exception Table Entry?

Apr 8, 2014

because of the need to implement a certain software watermarking technique I have to manipulate the exception table.
 
(Link to the paper that describes the technique: [URL] .... (Section "Extension to Java Bytecode")
   
So far I could manually add the exception table entry with Javassist:
 
MethodInfo minfo = (MethodInfo) aclasscf.getMethods().get(0);
CodeAttribute ca = minfo.getCodeAttribute();
ExceptionTable et = ca.getExceptionTable();

[Code]....

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Oct 24, 2014

I have problem with manually (through my java code) selecting items in a JTree. I did Google the problem and found solutions here :

[URL]

This code worked for me only partially. Once I tried selecting deeper nested nodes, I ran into problems. Since my production code is very cluttered I built an example and reproduced my exact problem in it.

DummyView.java
package de.fortis.tcws.client.controller;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

[code].....

The important method is 'manualSelect(String[])'.

It streps through the tree by comparing user objects and finds the target node. Then it calls 'navigateToNode()' which uses the solution discussed in the links above.

This method behaves incosistently:

If you call it with an empty array it will correctly select the root node. The righthand pane shows the text of the selected node. = correct

If you call it with target node 1 it will correctly select node 1. The righthand pane shows the text of the selected node. = correct

If you call it with target node 1.1 it will select node 1.1 but for some reason it is not displayed as marked (no background). The righthand pane shows the text of the selected node. = only partly correct

If you call it with target node A it will run into an exception. Debugging reveals that the selection occurs correclty at first. You can also observe the righthand pane showing that 'A' was selected. But afterwards another TreeselectionEvent is occuring that has a NewLeadSelectionPath of null. I do not know where this second SelectionEvent is triggered from.

This code is run with Java 1.6.0_39 which is also what I will have to use in production.

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Manually Adding Exception Table Entry

Apr 7, 2014

I use Javassist to manually add a exception table entry:

Java Code:

MethodInfo minfo = (MethodInfo) aclasscf.getMethods().get(0);
CodeAttribute ca = minfo.getCodeAttribute();
ExceptionTable et = ca.getExceptionTable();
et.add(26, 30, 40, 0);
System.out.println("exception table size: " + et.size()); mh_sh_highlight_all('java');

If I get the bytecode with javap it seems to work:

Java Code:

Exception Table
from to target type
26 30 40 any mh_sh_highlight_all('java');

But the problem is that I can't run the file anymore. Simply running it with the java command results in "java.lang.VerifyError: Expecting a stackmap frame at branch target 40". After some research this seems to be a problem with java 7 and a stricter verifier. I read several times that java -XX:-UseSplitVerifier should be used instead.

This really fixed the stackmap error, but then another error appeared: "java.lang.VerifyError: (class: AClass, method: signature: ()V) Inconsistent stack height 2 != 1". Are there any further steps required to insert a new exception in the exception table?

Additional info: Later I want to remove gotos (in this case the goto at line 27) and add a function call instead. When this function finishes it will throw a exception and propagate it back to the caller (which will be at line 27). Then the program should go on as if nothing happend, that is also the reason why the target of the exception is the same as the target of the goto (40)

Here is the bytecode:

Java Code:

0: aload_0
1: invokespecial #8 // Method java/lang/Object."<init>":()V
4: iconst_0
5: istore_1
6: goto 19
9: getstatic #10 // Field java/lang/System.out:Ljava/io/PrintStream;
12: iload_1
13: invokevirtual #16 // Method java/io/PrintStream.println:(I)V

[Code] .....

Exception table:
from to target type
26 30 40 any mh_sh_highlight_all('java');

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May 16, 2014

I'm not a java developer, i'm a tester. I am currently testing a java swing application and to do that I have to automate how its used. IE I have to write code which will press buttons for me rather than depending on an end user to do this. I have managed to reverse engineer the entire application (hooray for me), however I am struggling to work out how to invoke methods that would typically be kicked off by a user pressing a button. how to I can call actionPerformed(ActionEvent ae) method which sits in the ATMMainPanel class?

I will be calling it from inside another method which is the equivalent of the main() method.

Java Code:

public class ATMMainPanel extends JPanel implements ActionListener {
[declarations here]
//here - User is pressing the Enter button after putting in pin.
public void actionPerformed(ActionEvent ae) {
[code performed when button is pressed]
} mh_sh_highlight_all('java');

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Jan 28, 2015

This piece of code i cannot change

public class Lab
{
public static void main(string args[]) {
int ar[]={7,5,2,8,4,9,6};
int sorted[]=new int[ar.length];

/// my code is right here this i can change i keep getting array required int found i'm not sure what i'm doing wrong i do know i need 2 for loops and an if statement.

[code]for(i=0;i<ar.length;i++){
for(j=i+1;j<ar.length;j++){
if(ar.length[i]>ar.length[j]
this piece of code cannot change
for(int i = 0; i<sorted.length; i++)
{
system.out.println("sorted[" + i + "] = " + sorted[i]);[/code]

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I get the following error when I try to run my jar file from a Batch file and CMD manually (The batch file is just set to run the jar and record any output to a text file, and open it after).

Exception in thread "main" java.lang.IllegalArgumentException: input == null!
at javax.imageio.ImageIO.read(Unknown Source)
at com.github.bewd.project.main.Main.<init>(Main.java:37)
at com.github.bewd.project.main.Main.main(Main.java:76)

However running from Netbeans, it works perfectly; JFrame and all. I'm not sure if it's something wrong with my classpath (which I don't think is likely) or something in my code that's affecting it, here's the code:

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.math.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.Scanner;
import java.util.logging.Logger;
import javax.imageio.ImageIO;

[code]....

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class DisplayFinal_Panel extends JPanel {
private JLabel label1, label2, label3;
private JTextField box;

[code]....

I only want Listener 1 to work right now. Also, user input is in TextField.

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Mar 7, 2014

I'am trying to converting string data into xml data using xml beans and StringEscapeUtils.This is work fine but in one case it if the data contains special characters.
  
Code snippet
--------------------
import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
public class ParseXMLData { 
    public static XmlObject parseXML(String stringXML) {
        XmlObject xmlObject = null;

[Code] ....
 
success case
---------------------------
i/p------<aaa><bbb>This converts string to xml</bbb></aaa>
o/p---<aaa><bbb>This converts string to xml</bbb></aaa>
 
Failer case
-----------------
i/p----<aaa><bbb>This fails if it contains < symbols</bbb></aaa>
expected o/p----<aaa><bbb>This fails if it contains < symbols</bbb></aaa>
 
Observed that it converts < to '<' but  as per xml rules, if data contains '< ' it fails. I want to convert staring and end tags to xml format and if data in b/w middle of starting and ending tags do'n need to convert it. How to do it.

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In the for loop below, I thought I would see if it would work, but it does not. The loop only executes once and does not allow me to enter data.

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FileWriter fw = new FileWriter("dbs3.java");
BufferedWriter bw = new BufferedWriter(fw);
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[Code] ....

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<form method="POST" action="GetFile" enctype="multipart/form-data">
<input type="file" name="datafile">
<input type="text" name="text1">
<input type="submit" value="Next">
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System.out.println(request.getParameter("text1"));

I am able to upload the file to the server, but I am not able to get the value of text1 in the servlet (I am getting null value of text1 in the servlet), I need this textfield in the form to submit some additional information while uploading it to the server.

--> Is enctype="multipart/form-data" option of form doesn't allow other form data to be submited? if it doesn't allow it then what are the other options I have to send this additional textfield to the server.

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Java Code:

Class Hops{
String Name;
float Alpha Acid;
float Beta Acid;
};

Class Malt{
String Name;
float extract;
};

Class Recipie{
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CList RecipieList; mh_sh_highlight_all('java');

I read the article on Serialization presented at tutorial point, but the example only showed a simple class, not lists of class members. What I want to do is serialize RecipieList, which consists of a CList of Recipies, which in turn consist of CLists of various ingredients.

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Java Code:

public static void main(String[] args) {
// TODO Auto-generated method stub
// Variables Declaration Section
//******************************
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[Code] ....

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<?xml version="1.0" encoding="UTF-8"?>
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