servlets | 易学教程

Tomcat Servlet ClassNotFoundException

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问题 I created simple servlet. package servlets; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; public class testServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); out.print("TEST");

How can you pass data from a Filter to the endpoint in Jersey

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问题 Can you pass some data from a javax.servlet.Filter to a Jersey endpoint without using ThreadLocal or HttpSession? And because the first question will be "why do you want to do this?": mostly curious. In practice I think I could use this to pass some data generated during authentication to the endpoint. Not using ThreadLocal eliminates the temptation to use that down the chain (hope there's no need to explain why that's evil) and not using HttpSession is more of a quirk :) 回答1: Try injecting

Communication between JSP and Servlet?

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问题 I have a jsp page that communicate with a servlet back end. Up until now, the way I communicate with that servlet is via .getJSON() which is a JQuery method. This work great if the data I want to send back is in the form of {key:value}. However, now I need to send a bit more data then that. The largest table in my database, contain roughly eleven attributes, and the number of row is about 20-40. It is not big, but not small to send table via JSON. I am think about XML, and I wonder if any one

How to pass a string containing double quotes from a jsp to a servlet through URL using get method

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问题 I want to set a jsp parameter to an attribute value which may contain special symbols, then use a form GET submit to pass the parameter to a servlet controller. For example, the parameter is: <input type="hidden" name="searchTerms" value="${sessionScope.combTerms}"></input> I noticed if sessionScope.combTerms contains double quotes, eg. location:"LOC1" , the controller will only receive the value of searchTerms to be location: in which the LOC1" disappeared. What should I do to make sure

Spring Security 3.0: How do I specify URLs to which a custom filter applies?

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问题 I am using Spring Security 3.0 with JSPs. I have created a RequireVerificationFilter that redirects unverified users to a "verify your email" page. I added the filter to the spring security filter stack in last place like so: Bean definition in my app-config.xml: <bean id="requireVerificationFilter" class="com.ebisent.web.RequireVerificationFilter" /> Filter added to spring security filter list in my security-config.xml: <custom-filter ref="requireVerificationFilter" after="LAST" /> The

Spring Security 3.0: How do I specify URLs to which a custom filter applies?

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Java (JSP/Servlet): equivalent of getServletContext() from inside a .jsp

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问题 How should I access the ServletContext from a .jsp? For example, how can I call the getRealPath method from inside a .jsp. Here's a Servlet, which works fine: protected void doGet( HttpServletRequest req, HttpServletResponse resp ) throws ServletException, IOException { resp.setContentType( "text/html; charset=UTF-8" ); final PrintWriter pw = resp.getWriter(); pw.print( "<html><body>" ); pw.print( getServletContext().getRealPath( "text/en" ) ); pw.print( "</body></html>" ); pw.flush(); pw

Equivalent of Servlet Filter for Jersey / JAX-RS / REST resources?

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问题 In a regular Web Application, I can assign a chain of Filters to various paths for aspects such as Authentication, Authorization, Errors, Logging and more. The advantage is that I write servlets to focus on core functionality without worrying about infrastructure aspects. I can write orthogonal, cross-cutting Filters to authenticate, authorize, etc. Then I can weave them in web.xml. Looking at web.xml is enough to assure me that there are no holes in my application. Is this possible in JAX-RS

How we can make servlet synchronized?

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问题 I am working on a servlet and i want to make my servlet synchronized.So please any can help me that how it can be possible. 回答1: Making a servlet synchronized is a very bad design. The main purpose of it will be destroyed. Servlets should be designed in such a way that it can process multiple number of requests simultaneously! Moreover, the servlet should not contain any state storage and press the need for synchronization. Please rethink your design 回答2: Anytime you synchronize blocks of

Sending 100 Continue using Java Servlet API

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问题 Is it possible to send "100 Continue" HTTP status code, and then later some other status code after processing entire request using Java Servlet API (HttpServletResponse)? I can't find any definitive "No" answer, although API doesn't seem to support it. 回答1: I assume you mean "100 Continue". The answer is: no, you can't (at least not the way it's intended, as provisional response). In general, the servlet engine will do it automatically, when the request requires it. Of course this makes it