CODEWITHSUNDEEP
javamysqlspringjspspring-mvc
user3853858
user3853858

Reputation: 245

Write to jsp file from Java file

I have a Java web service designed using Spring and a jsp file corresponding to it.

To further clarify, I have a jsp file called infosys.jsp WEB-INF/views which can be accessed like https:// localhost:8080/admin/infosys?id=34. I can pass in parameters too as shown.

In my web controller I have a method called

 @RequestMapping(value = "/infosys", method = RequestMethod.GET)
 public @ResponseBody void getId(@RequestParam(value="id", required=false) String id) {
    .......
}

I have debugged and this method works, I can access the id passed it. I am trying to display the id in my jsp file. For example if I say https:// localhost:8080/admin/infosys I want to be able to display 34. How can I write to my jsp file? I have a MySQL db intergrate if i need to store and access. If I need that how can I write to DB and access??

EDIT: infosys.jsp file:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ page isELIgnored ="false" %> 

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Info Sys</title>
</head>
<body>
<spring:url value="/" var="homeUrl"/>
<a href="${homeUrl}">Home</a>
<BR><BR>

</body>
</html>

Upvotes: 2

Views: 144

Answers (1)

Neil McGuigan
Neil McGuigan

Reputation: 48287

Your Controller's Handler Method should return a String (no @ResponseBody) with the name of the view. You should also set your ID in a model.

@RequestMapping(value = "/infosys", method = RequestMethod.GET)
String getId(@RequestParam(value="id", required=false) String id, org.springframework.ui.Model model) {

  model.addAttribute("id", id);
  return "admin/infosys";
}

You should use Spring's InternalResourceViewResolver to turn that returned value into the relative path to the view. You would add that as a bean in your Web Application Context Configuration file, usually at /WEB-INF/mvc-dispatcher-servlet.xml.

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="prefix" value="/WEB-INF/views/"/>
  <property name="suffix" value=".jsp"/>
</bean>

admin/infosys -> InternalResourceViewResolver -> /WEB-INF/views/admin/infosys.jsp;

Here's how it works:

  1. Http request to say, Tomcat
  2. Request is handled by Spring's DispatcherServlet
  3. DispatcherServlet finds correct HandlerMethod based on @RequestMapping
  4. DispatcherServlet creates a Model instance and passes to HandlerMethod by reference
  5. HandlerMethod returns view name to DispatcherServlet
  6. Spring adds model to Request scope
  7. DispatcherServlet gets view path from InternalResourceViewResolver
  8. Finds correct JSP
  9. Forwards request to JSP

In your JSP file, simple put ${id} anywhere in the page and this will be show the value of the "id" model attribute.

Upvotes: 6

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