Calling servlet from Java

Hello!
I need to send XML file to servlet from Java. I generate XML in general java class.
Is there any way how to call servlet directly from Java without using a page with form? I need to send it by post method. I need some java alternative to Microsoft.XMLHTTP object.
Thanks

Try this part of the Networking tutorial:
http://java.sun.com/docs/books/tutorial/networking/urls/index.html
It might be the answer to your question.

Similar Messages

Problem while calling servlet from java bean

I am trying to call a servlet from java bean in cep.
My java bean:
package com.bea.wlevs.example.algotrading;
import com.bea.wlevs.ede.api.StreamSink;
import com.bea.wlevs.example.algotrading.event.MarketEvent;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class MarketEventBean implements StreamSink {
     String s=null;
     public void onInsertEvent(Object event) {
          if (event instanceof MarketEvent) {
               MarketEvent marketEvent = (MarketEvent) event;
               try {
                    JAXBContext cxt = JAXBContext.newInstance(MarketEvent.class);
                    Unmarshaller unmarsh = cxt.createUnmarshaller();
                    StringReader strReader = new StringReader(marketEvent.getString_1());
                    MarketEvent obj = (MarketEvent) unmarsh.unmarshal(strReader);
                    s=obj.getSymbol();
                    System.out.println("data: " + s);
               } catch(Exception e) {
                    e.printStackTrace();
               try {
                    System.out.println("test1");
     URL url = new URL("http://172.18.21.94:7001/AppServletrecv-Model-context-root/ReceiveServlet");
     URLConnection conn = url.openConnection();
          System.out.println("test2");
     conn.setDoOutput(true);
          System.out.println("test3");
     BufferedWriter out =
     new BufferedWriter( new OutputStreamWriter( conn.getOutputStream() ) );
     out.write("symbol="+s);
          System.out.println("test4");
     out.flush();
     System.out.println("test5");
     out.close();
     System.out.println("test6");
     BufferedReader in =
     new BufferedReader( new InputStreamReader( conn.getInputStream() ) );
          System.out.println("test7");
     String response;
     while ( (response = in.readLine()) != null ) {
     System.out.println( response );
     in.close();
     catch ( MalformedURLException ex ) {
     // a real program would need to handle this exception
     catch ( IOException ex ) {
     // a real program would need to handle this exception
My servlet code:
package model;
import javax.servlet.http.HttpServlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ReceiveServlet extends HttpServlet {
private final static String _SYMBOL = "symbol";
public void doPost(HttpServletRequest request, HttpServletResponse response) {
* Get the value of form parameter
// private final static String USERNAME = "username";
String symbol = request.getParameter( _SYMBOL );
* Set the content type(MIME Type) of the response.
response.setContentType("text/html");
* Write the HTML to the response
try {
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title> A very simple servlet example</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Hello " + symbol +"</h1>");
out.println("</body>");
out.println("</html>");
out.close();
} catch (IOException e) {
Web.xml:
<?xml version = '1.0' encoding = 'windows-1252'?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
<servlet>
<servlet-name>ReceiveServlet</servlet-name>
<servlet-class>model.ReceiveServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ReceiveServlet</servlet-name>
<url-pattern>/ReceiveServlet</url-pattern>
</servlet-mapping>
</web-app>
My servlet is running in weblogic server.
But when I am running this program in weblogic server side there is no log.
Edited by: 856272 on Jun 23, 2011 6:43 AM

I would run both sides in a debugger and see what code is getting invoked

Calling servlet from java page flow

Hi,
I need to call servelt class from the <netui:anchor ..> tag of my jpf.
i have mapped this servlet class in the web.xml.
please tell us how to invoke servlet from the netui:anchor tag from the jpf action
method.
thanks
shashi

I am calling a Servlet from JAVA Class as I am using IDE: Eclipse. The Problem is below
URL url = new URL(ServletPath);
URLConnection connet = url.openConnection();Why should the Servlet running in different Runtime print on your Eclipse Runtime. Please be more clear about the question.

Calling Servlet from Java Class in eclipse

Hi ,
I am calling a Servlet from JAVA Class as I am using IDE: Eclipse. The Problem is below
URL url = new URL(ServletPath);
URLConnection connet = url.openConnection();
I am using the above code in JAVA to Connect to Servlet I have given Print statement in Servlet such that whenever it calls it prints on Console but when I try to run the code the Statement is not printed in the Console of eclipse I think URL connection is not able to establish any connection ..... if any has solution for this please reply
Thanks & Regards,
Arvind

I am calling a Servlet from JAVA Class as I am using IDE: Eclipse. The Problem is below
URL url = new URL(ServletPath);
URLConnection connet = url.openConnection();Why should the Servlet running in different Runtime print on your Eclipse Runtime. Please be more clear about the question.

Calling Servlet from Java-Class

Hi,
I have a normal java-class that is working with request/response Objects. From within this class I want to call a local servlet, let it do some work with the request and the response and then return it to the class.
I guess the RequestDispatcher can only be called from within a Servlet, but my class is not a servlet.
The getServlet()-method is not working any more.
Maybe somebody has an idea.
Thanks a lot,
Matthias

Hi,
I have a normal java-class that is working with
request/response Objects. From within this class I
want to call a local servlet, let it do some work with
the request and the response and then return it to the
class.
I guess the RequestDispatcher can only be called from
within a Servlet, but my class is not a servlet.
The getServlet()-method is not working any more.
Maybe somebody has an idea.
Thanks a lot,
MatthiasThis is not very pretty, so I think you should redessign, but you can open a URLConnection from your class pointing to the URL of the servlet. As far as I know you can't invoke a servlet directly, because you can't get a reference to it, it can only be invoked by the container...

Calling a servlet from java

How to call a servlet from java?
your help is greatly appreciated..

Welcome to the forum
You seem to be misunderstanding something. Do some googling to learn what you need about servlets. Simplified, servlets are java code that's hosted by a web container, such as Tomcat. When a servlet gets called as a consequence of someone requesting a url from the container, it takes in a request object and a response object. All the magic is then in creating an appropriate response (e.g. html) for the incoming request.

Calling servlet from a java program

Hi
I need to call a servlet's doPost() method from a java program. I have a specific situation, where I need to call servlet from a java program. DUring this call I need to pass a file and two string to the servlet. Servelt after receiving the file and string uploads the file to the server at a specified location. I am stuck up as how to call servlet from a java program instead of a HTML or JSP.
Can anyone help me to start with this.
any suggestion is welcome.

You have to establish a URLConnection with servlet from your java program.
URL servletURL = new URL("http://localhost:8080/Myservlet?str1=abc&str2=def");
URLConnection servletConnection = servletURL.openConnection();you can get the objectOutputStream
ObjectOutputStream oos = new ObjectOutputStream (servletConnection.getOutputStream());
oos.writeObject(your file object);-------------------------------------------------
In the servlet u can get the strings using request.getParameter("str1");
In the servlet u can get the strings using request.getParameter("str2");
file = new ObjectInputStream (request.getInputStream()).readObject()a lot of resources are available on this ...
hope this helps :)

Calling Servlet from a java prog?

Hi all,
I am calling servlet from a java prog (Java Agent in Lotus Notes) by using URL and URLConnection object. how can i trigger the Servlet By using doPost method .I have to send some parameter also.
Thanx
Muthu

you need to open a connection to the servlet. Then you must call getInputStream() and getOutputStream() and use them in any way you see fit. I was trying this before and could not get POST to work unless I openned the input stream from the servlet. Strange... but doGet worked without openning the input stream???
// open a connection....
// write to the servlet
servletConnection.getOutputStream().write("whatever");
servletConnection.getOutputStream().flush();
servletConnection.getOutputStream().close();
// grab what the servlet sends back, required to do a post.
byte [] in = new byte[100];
servletConnection.getInputStream().read(in);
servletConnection.getInputStream().close();

How to call Servlet from jsp page and how to run this app using tomcat..?

Hi ,
I wanted to call servlet from jsp action i.e. on submit button of JSP call LoginServlet.Java file.
Please tell me how to do this into jsp page..?
Also i wanted to execute this application using tomcat.
Please tell me how to do this...? what setting are required for this...? what will be url ..??
Thanks.

well....my problem is as follows:
whenever i type...... http://localhost:8080/appName/
i am getting 404 error.....it is not calling to login.jsp (default jsp)
but when i type......http://localhost:8080/appName/login.do........it executes servlet properly.
Basically this 'login.do' is form action (form action='/login.do').....and i wanted to execute this from login jsp only.(from submit button)
In short can anyone please tell me how to diaplay jsp page using tomcat 5.5
plz help me.

Calling servlets from main()?

Hi
I would like to know that while calling servlets from another class having main(), how can we set the type of request i.e. put, post or get?
Thanks

use the method - setRequestMethod( "POST") of HttpURLConnection for setting the method to POST.Similarly for other methods..
You could find [url http://java.sun.com/developer/JDCTechTips/2004/tt0210.html#2]this useful

"ReferenceError: "myIpAddr" is not defined, when call JavaScript from java

Hi developers,
My java application was trying to issue a http request via proxy auto-config. So, I did below jobs
1. Read URL of *.pac from registry
2. Call FindProxyForURL from java, the code is like below
               ScriptEngineManager factory = new ScriptEngineManager();
               ScriptEngine engine = factory.getEngineByName("JavaScript");
               engine.eval(autoProxyScript);
               Invocable inv = (Invocable) engine;
               Object obj = inv.invokeFunction("FindProxyForURL",
                         "http://java.sun.com/",
                         "java.sun.com");
However, I got "ReferenceError: "myIpAddress" is not defined
I can not change the script on server to add a function like "myIpAddress", I am wordering why IE or mozilla can call it successfully and get proxy server, while Java failed to do that.
I got a ugly solution by calling "pacparser" by jni. But I really hope I can get a better solution.

A .pac file is a JavaScript, but it requires some functions to be defined in the executing context to work (i.e. you must define those).
From the example on the Wikipedia page there's at least "shExpMatch" and "isInNet". "myIpAddress" seems to be another such candidate.

Call OSB from java client

Hi',
I am trying to call OSB from java client,
The OSB proxy Service type is "WSDL Web Service", I am able to get response from SOAP UI with below request, Please help me with Java code,
I have been Googling a lot for this however didnt got enough.
Thanks
Yatan
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:v1="http://core.xxx.com/schema/ServiceHeader/V1.0" xmlns:v11="http://core.xxx.com/schema/Customer/V1.0" xmlns:v12="http://core.xxx.com/schema/Customer/V1.0">
<soapenv:Header>
<wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<wsse:UsernameToken wsu:Id="UsernameToken-2" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<wsse:Username>weblogic</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">welcome1</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
<v1:GMWSHeader>
<v1:SourceId>String</v1:SourceId>
<v1:TransactionId>String</v1:TransactionId>
<v1:TransactionTimeStamp>1967-08-13</v1:TransactionTimeStamp>
<v1:ServiceVersion>LATEST</v1:ServiceVersion>
</v1:GMWSHeader>
</soapenv:Header>
<soapenv:Body>
<v11:GetDetailsRequest>
<v11:Condition>
<v12:SellingSource>?</v12:SellingSource>
<v12:FulfillingFCNNbr>?</v12:FulfillingFCNNbr>
</v11:Condition>
</v11:GetDetailsRequest>
</soapenv:Body>
</soapenv:Envelope>

Thanks Guys, I tried the ways you mentioned I am getting below error, this error is coming in both weblogic clientgen and webservice proxy from jdeveloper,
I understand that this error has something to do with my process however not sure why is it coming, I will really appreciate if you can provide me some pointers.
error:
Buildfile: C:\JDeveloper\OSBClient\TestOSBClient\build.xml
javaFromWSDL:
[clientgen]
*********** jax-ws clientgen attribute settings ***************
wsdlURI: http://localhost:8001/xx/som/contracts/CustomerContract?wsdl
packageName : com.osb.client
destDir : C:\OSB
*********** jax-ws clientgen attribute settings end ***************
[clientgen] Consider using <depends>/<produces> so that wsimport won't do unnecessary compilation
[clientgen] parsing WSDL...
[clientgen]
[clientgen]
[clientgen] [ERROR] A class/interface with the same name "com.osb.client.SOMMessage" is already in use. Use a class customization to resolve this conflict.
[clientgen] line 89 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
[clientgen] [ERROR] (Relevant to above error) another "SOMMessage" is generated from here.
[clientgen] line 51 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
[clientgen] [ERROR] A class/interface with the same name "com.osb.client.TaskCompletionMessage" is already in use. Use a class customization to resolve this conflict.
[clientgen] line 82 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
[clientgen] [ERROR] (Relevant to above error) another "TaskCompletionMessage" is generated from here.
[clientgen] line 76 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
[clientgen] [ERROR] Two declarations cause a collision in the ObjectFactory class.
[clientgen] line 89 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
[clientgen] [ERROR] (Related to above error) This is the other declaration.
[clientgen] line 51 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
[clientgen] [ERROR] Two declarations cause a collision in the ObjectFactory class.
[clientgen] line 82 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
[clientgen] [ERROR] (Related to above error) This is the other declaration.
[clientgen] line 76 of http://localhost:8001/xx/som/contracts/CustomerContract?SCHEMA%2FSOMResources%2FXSD%2FSOMCommon
[clientgen]
BUILD FAILED
weblogic.wsee.tools.WsBuildException: Error running JAX-WS clientgen: null
     at weblogic.wsee.tools.clientgen.jaxws.ClientGenImpl.execute(ClientGenImpl.java:175)
     at weblogic.wsee.tools.anttasks.ClientGenFacadeTask.execute(ClientGenFacadeTask.java:244)
     at weblogic.wsee.tools.anttasks.ClientGenTask.execute(ClientGenTask.java:365)
     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatinxxethodAccessorImpl.invoke(DelegatinxxethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
     at org.apache.tools.ant.Task.perform(Task.java:348)
     at org.apache.tools.ant.Target.execute(Target.java:357)
     at org.apache.tools.ant.Target.performTasks(Target.java:385)
     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
     at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
     at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
     at org.apache.tools.ant.Main.runBuild(Main.java:758)
     at org.apache.tools.ant.Main.startAnt(Main.java:217)
     at org.apache.tools.ant.Main.start(Main.java:179)
     at org.apache.tools.ant.Main.main(Main.java:268)
Caused by: Error starting wsimport:
     at com.sun.tools.ws.ant.WsImport2.execute(WsImport2.java:757)
     at weblogic.wsee.tools.clientgen.jaxws.ClientGenImpl.execute(ClientGenImpl.java:169)
     ... 19 more
Caused by: com.sun.tools.ws.wscompile.AbortException
     at com.sun.tools.ws.processor.modeler.wsdl.JAXBModelBuilder.bind(JAXBModelBuilder.java:136)
     at com.sun.tools.ws.processor.modeler.wsdl.WSDLModeler.buildJAXBModel(WSDLModeler.java:2255)
     at com.sun.tools.ws.processor.modeler.wsdl.WSDLModeler.internalBuildModel(WSDLModeler.java:194)
     at com.sun.tools.ws.processor.modeler.wsdl.WSDLModeler.buildModel(WSDLModeler.java:140)
     at com.sun.tools.ws.wscompile.WsimportTool.buildWsdlModel(WsimportTool.java:261)
     at com.sun.tools.ws.wscompile.WsimportTool.run(WsimportTool.java:203)
     at com.sun.tools.ws.wscompile.WsimportTool.run(WsimportTool.java:188)
     at com.sun.tools.ws.ant.WsImport2.execute(WsImport2.java:738)
     ... 20 more
Total time: 3 seconds

Wot all ways are there to call servlet from jsp

hi all
i want to know wot all methods are available
so that i can call servlet from jsp
the one which i know is using RequestDispatcher
wot are others ?
thanx

hi all
i want to know wot all methods are available
so that i can call servlet from jsp
the one which i know is using RequestDispatcher
wot are others ?
thanxhi here are few ways... to call servlet from jsp...
these are just generic syntax.
Form:
<form action="ServletPath">
Link:
Directives & Action tags :
<%@ page import="ServletPath" %>
     <%@ taglib uri="ServletPth" %>
     <jsp:include page="ServletPath">
     <jsp:forward page="ServletPath">
     <jsp:useBean class="ServletPath"> (Not sure about this useBean)
hope you got your answer.
regards,
immu

Call ABAP from Java

Can any one help me in calling an ABAP program from Java.
The version of SAP with me is 4.7.
Thanks in advance.
Regards ,
Nagaraju Donikena

To call ABAP from Java when I tried doing it from sample code given in help I was getting the following error. Can any one help in this regard.
Exception in thread "main" java.lang.ExceptionInInitializerError: JCO.classIniti
alize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'
JCO.nativeInit(): Could not initialize dynamic link library sapjcorfc [no sapjco
rfc in java.library.path]. java.library.path
        at com.sap.mw.jco.JCO.<clinit>(JCO.java:735)
        at TestConnect.<init>(TestConnect.java:8)
        at TestConnect.main(TestConnect.java:25)

Calling BDC from Java using JCO

Hello Everyone,
Is it possible to call a BDC from Java program using JCO ?

Are you serious with that question? Did you try to build the web service client before? Because this is exactly the same. Try to find "building web service clients" instead "Calling BPEL from java". By default (probably) every BPEL process has both WSIF and SOAP end points, just use correct WSDL address.

Calling servlet from Java

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