servlets

how to send data from servlet to rest api

由 谁都会走 提交于 2020-01-14 18:57:06
问题 I want to send data from my servlet to a rest api . Is it how it's done : protected void doPost( HttpServletRequest request , HttpServletResponse response ) throws ServletException, IOException { String Id= "MyId"; response.setContentType("application/json"); response.getWriter().write(Id); getServletContext() .getRequestDispatcher("<PathofAPI>") .forward(request, response); } And once the data is send how to retreive it in my rest api 回答1: Alternatively you must create POJO class for you Id

pass parameters from servlet to jsp page

由 泪湿孤枕 提交于 2020-01-14 18:50:24
问题 I have to pass parametrs From servlet to jsp .Iam using the following code.Is it possible to pass parameters through this way? String val="Testvalue" RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/index.jsp?valpass=val"); dispatcher.forward(request, response); In jsp String value=(String)request.getAttribute("valpass") ^ 回答1: if you forward from servlet to jsp you should set as attribute do request.setAttribute("key","value") parameter is mainly used in

pass parameters from servlet to jsp page

由 大兔子大兔子 提交于 2020-01-14 18:48:45
问题 I have to pass parametrs From servlet to jsp .Iam using the following code.Is it possible to pass parameters through this way? String val="Testvalue" RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/index.jsp?valpass=val"); dispatcher.forward(request, response); In jsp String value=(String)request.getAttribute("valpass") ^ 回答1: if you forward from servlet to jsp you should set as attribute do request.setAttribute("key","value") parameter is mainly used in

Can context-param be referenced inside web.xml?

由 早过忘川 提交于 2020-01-14 09:34:04
问题 Can I reference context parameter in a DD itself? For instance: <context-param> <param-name>firstParam</param-name> <param-value>/first</param-value> </context-param> And then I would like to be able to do something like this: <servlet-mapping> <servlet-name>firstServlet</servlet-name> <url-pattern>${firstParam}</url-pattern> </servlet_mapping> 回答1: No , it is not possible. There is no such feature. 来源： https://stackoverflow.com/questions/13575015/can-context-param-be-referenced-inside-web

Can context-param be referenced inside web.xml?

由 人走茶凉 提交于 2020-01-14 09:33:09
问题 Can I reference context parameter in a DD itself? For instance: <context-param> <param-name>firstParam</param-name> <param-value>/first</param-value> </context-param> And then I would like to be able to do something like this: <servlet-mapping> <servlet-name>firstServlet</servlet-name> <url-pattern>${firstParam}</url-pattern> </servlet_mapping> 回答1: No , it is not possible. There is no such feature. 来源： https://stackoverflow.com/questions/13575015/can-context-param-be-referenced-inside-web

java.lang.ClassNotFoundException: org.apache.poi.xssf.usermodel.XSSFWorkbook

由 自闭症网瘾萝莉.ら 提交于 2020-01-14 07:41:10
问题 when i tried to create a workbook in normal java class it is creating but when i tried to run the same on servlet it is throwing exceptions Normal java class import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class Sampleclass { public static void main(String[] args) { FileInputStream file; try { file = new FileInputStream

Passing integer variable from jsp to servlet

由 时光怂恿深爱的人放手 提交于 2020-01-14 06:30:08
问题 I have a jsp page where there are two variables which are flag variables....I want to pass these variables to a servlet. How should I pass these variables to a servlet? This is my jsp page. <html> <head> <title>Student Registration Form</title> <style type="text/css"> h3{font-family: Calibri; font-size: 22pt; font-style: normal; font-weight: bold; color:SlateBlue; text-align: center; text-decoration: underline } table{font-family: Calibri; color:white; font-size: 11pt; font-style: normal;

HTTP STATUS 404, requested resource is not available. What mistake am I doing? Tomcat 6.0

由 走远了吗. 提交于 2020-01-14 06:09:27
问题 My servlet application is package p1; import javax.servlet.*; import java.io.*; public class MyServ extends GenericServlet{ public void init(ServletConfig con){ System.out.println("INIT"); } public void service(ServletRequest req,ServletResponse res) throws ServletException,IOException{ PrintWriter pw=res.getWriter(); pw.println("HELLO"); pw.close(); } } and my web. xml file is <web-app> <servlet> <servlet-name>sai</servlet-name> <servlet-class>p1.MyServ</servlet-class> </servlet> <servlet

using GWT RPC mechanism with my customized Servlet

由 元气小坏坏 提交于 2020-01-14 05:10:10
问题 I currently have a GWT application which uses the RequestBuilde to send messages to a servlet I have (using POST and GET ), and my servlet (in doPost and doGet ) "pauses" the request (this is done by using Servlets 3.0 spec) and adds it to a queue. Additionally I have a Daemon thread which runs in the background and "plays" the request when there is new data. This works great for me apart from the fact that I'm just sending strings for now and I'd like to utilize the RPC mechanism to send

identify client machine Operating System by using request object in java web applications [duplicate]

由 最后都变了- 提交于 2020-01-14 05:02:40
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: How can I get client infomation such as OS and browser i want to know clients machine Operating system name when i received request in my servlet through request object thanks in advance 回答1: Example using the user-agent-utils library: public class SomeServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String
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