How to run hello world program using spring maven?
Question
I have started to learn spring and trying to create simple hello world application using maven in sts. Please anyone what am doing wrong in this code?
index.jsp :
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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>Spring4 MVC -HelloWorld</title>
</head>
<body>
<h1>Hello : ${name}</h1>
</body>
</html>
web.xml :
<?xml version="1.0" encoding="ISO-8859-1" ?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
</web-app>
dispatcher-servlet.xml :
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:component-scan base-package="com.helloworld" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>index.jsp</value>
</property>
</bean>
</beans>
HelloWorldController.java :
@Controller
public class HelloWorldController {
/**
* @param name
* @param model
* @return string
*/
@RequestMapping("/hello")
public String hello(@RequestParam(value="name", required=false, defaultValue="World") String name, Model model) {
model.addAttribute("name", name);
return "helloworld";
}
}
This is my code and when am trying to run this in browser i got message "The requested resource is not available." Please anyone tell me what i have done wrong ?Thanks
2 answers
solution1
0 2014-11-13 11:00:21
A correction is required in dispatcher-servlet.xml. Instead of using suffix as 'index.jsp' it should be '.jsp'. Second you should also point to the view type for example JSTLView. Here is a snapshot for your reference:
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
I am assuming that your controller class is in package 'com.helloworld' and you are hitting a URL similar to hostname:port/AppName/hello Where AppName is your Application Name, hostname could be localhost and port be default is 8080.
solution2
0 ACCPTED 2014-11-13 11:07:24
Change your index.jsp as
<body>
<center>
<h2>Hello World</h2>
<h3>
<a href="hello?name=ABC">Click Here</a>
</h3>
</center>
</body>
modify dispatcher-servlet as
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
Spring will resolve the view's name /hello as
When request for /hello comes to controller it will redirect to helloworld.jsp.
prefix + view name + suffix = /WEB-INF/pages/helloworld.jsp
I hope this solves your problem.
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