Tuesday, 27 February 2018

13.0 MVC SPRING FIRST PROGRAM


Controller Creation demo (download)




















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TestController.java
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package com.spring.demo;

 import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

 @Controller
public class TestController {
@RequestMapping("/")
public String displayForm(){
return "home";
}
}


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home.jsp
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<html>
<body>
<h1>SPRING CONFIG TEST FIRST PROGRAM</h1>
</body>
</html>


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web.xml
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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">

<display-name>spring-mvc-demo</display-name>

<!-- Spring MVC Configs -->

<!-- Step 1: Configure Spring MVC Dispatcher Servlet -->
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-mvc-demo-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<!-- Step 2: Set up URL mapping for Spring MVC Dispatcher Servlet -->
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>


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spring-mvc-demo-servlet.xml
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!-- Step 3: Add support for component scanning -->
<context:component-scan base-package="com.spring.demo" />

<!-- Step 4: Add support for conversion, formatting and validation support -->
<mvc:annotation-driven/>

<!-- Step 5: Define Spring MVC view resolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>

</beans>



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spring-mvc-demo-servlet.xml
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Example 2 : How to catch form data




















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form.jsp
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<html>
<body>
<H2>Welcome to Spring form testing</H2>
<form method="GET" action ="formProcess">
<input type="text" name="uname" placeholder="What is your name ?">
<input type="submit" value="Login">
</form>
</body>
</html>

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home.jsp
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<html>
<body>
<h1>SPRING CONFIG TEST FIRST PROGRAM</h1>
<hr>
<h3><a href="form">User Form</a></h3>
</body>
</html>

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output.jsp
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<html>
<body>
<h2>Welcome to the final result page</h2>
<h3>Hello ${param.uname}</h3>
</body>
</html>

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TestController
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package com.spring.demo;

 import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

 @Controller
public class TestController {
@RequestMapping("/")
public String displayForm(){
return "home";
}

@RequestMapping("/form")
public String showForm(){
return "form";
}

@RequestMapping("/formProcess")
public String Process(){
return "output";
}
}



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OUTPUT
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Example 2 : How to catch form data using request dispatcher


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TestController.java
-----------------------------------------------------------------------------------
package com.spring.demo;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class TestController {
@RequestMapping("/")
public String displayForm(){
return "home";
}
@RequestMapping("/form")
public String showForm(){
return "form";
}
@RequestMapping("/formProcess")
public String Process(){
return "output";
}
@RequestMapping("/formProcessFirstMethod")
public String processFirstMethod(HttpServletRequest request,Model model)
{
String name=request.getParameter("uname");
name=name.toUpperCase();
String result="UPPER CASE : "+name;
model.addAttribute("message",result);
return "output";
}
@RequestMapping("/formProcessSecondMethod")
public String processSecondMethod(@RequestParam("uname") String name,Model model)
{
name=name.toUpperCase();
String result="UPPER CASE : "+name;
model.addAttribute("message",result);
return "output";
}
}


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form.jsp
-----------------------------------------------------------------------------------

<html>
<body>
<H2>Welcome to Spring form testing</H2>
<form method="GET" action ="formProcess">
<input type="text" name="uname" placeholder="What is your name ?">
<input type="submit" value="Login">
</form>
<hr>
<H2>Welcome to Spring form testing Request parameter</H2>
<form method="GET" action ="formProcessFirstMethod">
<input type="text" name="uname" placeholder="What is your name ?">
<input type="submit" value="Login">
</form>
<hr>
<H2>Welcome to Spring form testing Request parameter Second method</H2>
<form method="GET" action ="formProcessSecondMethod">
<input type="text" name="uname" placeholder="What is your name ?">
<input type="submit" value="Login">
</form>
</body>
</html>

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output.jsp
-----------------------------------------------------------------------------------
<html>
<body>
<h2>Welcome to the final result page</h2>
<h3>Hello ${param.uname}</h3>
<h3>${message}</h3>
<h3>${message}</h3>
</body>
</html>

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OUTPUT
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