requestdispatcher | 易学教程

Passing data from servlet to another servlet using RequestDispatcher

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I am trying to pass data from one servlet to another using the RequestDispatcher. This is my code for the Dispatcher. String address; address = "/Java Resources/src/coreservlets/MapOut.java"; RequestDispatcher dispatcher = request.getRequestDispatcher(address); dispatcher.forward(request, response); When I try to run it, it gives me an error saying the path is unavailable. Do I have to include something for the dispatcher to send to another servlet? You just need to pass servlet-mapping 's url-pattern in the getRequestDispatcher . Let say your servlet mapping is "myMap" for the "MapOut"

How to forward the requestdispatcher to a remote URL

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Am having a HTML page http://www.mywebapp.com/sample.html which is used from remote server. am passing the HTML URL as hidden form like this in the same HTML form, <form action="/myservlet?userid=12345" method="post" enctype="multipart/form-data"> <input type="file" name="file"> <input type="submit" value="Submit"> <input type="hidden" name="url" value="http://www.mywebapp.com/sample.html"/> </form> In my servlet i got the hidden URL http://www.mywebapp.com/sample.html and stored it as String fieldValue = http://www.mywebapp.com/sample.html Now When i try RequestDispatcher and forward the page

Does RequestDispatcher work over multiple webapps in one servlet container?

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问题 Does RequestDispatcher work over multiple webapps ? I'm asking because I had a single webapp working fine that uses RequestDispatcher rather than redirects so state isnt lost when displaying error and feedback messages. However I now need to split some functionality between two webapps, so initial call is made from a webpage hosted on webapp1, calls webapp2 which eventually returns user to a page hosted on webapp1. Clearly if webapps and webapp2 were on different websites using

Does RequestDispatcher work over multiple webapps in one servlet container?

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Does RequestDispatcher work over multiple webapps ? I'm asking because I had a single webapp working fine that uses RequestDispatcher rather than redirects so state isnt lost when displaying error and feedback messages. However I now need to split some functionality between two webapps, so initial call is made from a webpage hosted on webapp1, calls webapp2 which eventually returns user to a page hosted on webapp1. Clearly if webapps and webapp2 were on different websites using RequestDispatcher would not be possible but is it if both webapps are deployed within the same instance of a servlet

Request Attributes not available in jsp page when using sendRedirect from a servlet

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I am new to jsp and servlet. My scenario is as follows I have a jsp page which have a form in it. with two fields. The code snipet of the jsp page is as follows. MyFirstJSP.jsp file <body> <h1> This is my first jsp and servlet project</h1> <% //System.out.println(request.getAttribute("fname")); if(request.getAttribute("fname")!=null){ System.out.println(request.getAttribute("fname")); }else{ System.out.println("No request "); } %> <form action="MyFirstServlet" method="get"> First Name<input type="text" name="fname" value= ${fname}><br> Last Name<input type="text" name="lname" value= ${lname}>

Request Attributes not available in jsp page when using sendRedirect from a servlet

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问题 I am new to jsp and servlet. My scenario is as follows I have a jsp page which have a form in it. with two fields. The code snipet of the jsp page is as follows. MyFirstJSP.jsp file <body> <h1> This is my first jsp and servlet project</h1> <% //System.out.println(request.getAttribute("fname")); if(request.getAttribute("fname")!=null){ System.out.println(request.getAttribute("fname")); }else{ System.out.println("No request "); } %> <form action="MyFirstServlet" method="get"> First Name<input

Exception starting filter struts2 - tried adding JAR's, but same result

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Here is the error I am getting: SEVERE: Exception starting filter struts2 java.lang.NoClassDefFoundError: com/opensymphony/xwork2/config/FileManagerProvider at org.apache.struts2.dispatcher.Dispatcher.init_FileManager(Dispatcher.java:336) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:465) at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:193) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:424) at org.apache

java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed

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问题 This method throws java.lang.IllegalStateException: Cannot forward after response has been committed and I am unable to spot the problem. Any help? int noOfRows = Integer.parseInt(request.getParameter(\"noOfRows\")); String chkboxVal = \"\"; // String FormatId=null; Vector vRow = new Vector(); Vector vRow1 = new Vector(); String GroupId = \"\"; String GroupDesc = \"\"; for (int i = 0; i < noOfRows; i++) { if ((request.getParameter(\"chk_select\" + i)) == null) { chkboxVal = \"notticked\"; }