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What we will do:

  • Lets use a command bean for Todo
  • Add Validations
  • The JSR 303 and JSR 349 defines specification for the Bean Validation API (version 1.0 and 1.1, respectively), and Hibernate Validator is the reference implementation.
  • org.hibernate:hibernate-validator

Useful Snippets

		<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>

		<form:form method="post" commandName="todo">
			<fieldset class="form-group">
				<form:label path="desc">Description</form:label>
				<form:input path="desc" type="text" class="form-control" required="required"/>
			</fieldset>
		</form:form>

		@Size(min = 10, message = "Enter atleast 10 Characters.")
		
		@Valid Todo todo, BindingResult result

		if (result.hasErrors())
			return "todo";
		
		<form:errors path="desc" cssClass="text-warning" />

Files List

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.in28minutes.springboot.web</groupId>
	<artifactId>spring-boot-first-web-application</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>spring-boot-first-web-application</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.4.3.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
		</dependency>
		
		<dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>3.3.6</version>
        </dependency>
        
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>1.9.1</version>
        </dependency>

		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

src/main/java/com/in28minutes/springboot/web/controller/LoginController.java

package com.in28minutes.springboot.web.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;

import com.in28minutes.springboot.web.service.LoginService;

@Controller
@SessionAttributes("name")
public class LoginController {
	
	@Autowired
	LoginService service;
	
	@RequestMapping(value="/login", method = RequestMethod.GET)
	public String showLoginPage(ModelMap model){
		return "login";
	}
	
	@RequestMapping(value="/login", method = RequestMethod.POST)
	public String showWelcomePage(ModelMap model, @RequestParam String name, @RequestParam String password){
		
		boolean isValidUser = service.validateUser(name, password);
		
		if (!isValidUser) {
			model.put("errorMessage", "Invalid Credentials");
			return "login";
		}
		
		model.put("name", name);
		model.put("password", password);
		
		return "welcome";
	}

}

src/main/java/com/in28minutes/springboot/web/controller/TodoController.java

package com.in28minutes.springboot.web.controller;

import java.util.Date;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;

import com.in28minutes.springboot.web.model.Todo;
import com.in28minutes.springboot.web.service.LoginService;
import com.in28minutes.springboot.web.service.TodoService;

@Controller
@SessionAttributes("name")
public class TodoController {

	@Autowired
	TodoService service;

	@RequestMapping(value = "/list-todos", method = RequestMethod.GET)
	public String showTodos(ModelMap model) {
		String name = (String) model.get("name");
		model.put("todos", service.retrieveTodos(name));
		return "list-todos";
	}

	@RequestMapping(value = "/add-todo", method = RequestMethod.GET)
	public String showAddTodoPage(ModelMap model) {
		model.addAttribute("todo", new Todo(0, (String) model.get("name"), "Default Desc",
				new Date(), false));
		return "todo";
	}

	@RequestMapping(value = "/delete-todo", method = RequestMethod.GET)
	public String deleteTodo(@RequestParam int id) {
		service.deleteTodo(id);
		return "redirect:/list-todos";
	}

	@RequestMapping(value = "/add-todo", method = RequestMethod.POST)
	public String addTodo(ModelMap model, @Valid Todo todo, BindingResult result) {
		
		if(result.hasErrors()){
			return "todo";
		}
		
		service.addTodo((String) model.get("name"), todo.getDesc(), new Date(),
				false);
		return "redirect:/list-todos";
	}
}

src/main/java/com/in28minutes/springboot/web/model/Todo.java

package com.in28minutes.springboot.web.model;

import java.util.Date;

import javax.validation.constraints.Size;

public class Todo {
    private int id;
    private String user;
    
    @Size(min=10, message="Enter at least 10 Characters...")
    private String desc;

    private Date targetDate;
    private boolean isDone;

    public Todo() {
    		super();
    }
    
    public Todo(int id, String user, String desc, Date targetDate,
            boolean isDone) {
        super();
        this.id = id;
        this.user = user;
        this.desc = desc;
        this.targetDate = targetDate;
        this.isDone = isDone;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public Date getTargetDate() {
        return targetDate;
    }

    public void setTargetDate(Date targetDate) {
        this.targetDate = targetDate;
    }

    public boolean isDone() {
        return isDone;
    }

    public void setDone(boolean isDone) {
        this.isDone = isDone;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + id;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        Todo other = (Todo) obj;
        if (id != other.id) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return String.format(
                "Todo [id=%s, user=%s, desc=%s, targetDate=%s, isDone=%s]", id,
                user, desc, targetDate, isDone);
    }

}

src/main/java/com/in28minutes/springboot/web/service/LoginService.java

package com.in28minutes.springboot.web.service;

import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

@Service
public class LoginService {

	public boolean validateUser(String userid, String password) {
		// in28minutes, dummy
		return userid.equalsIgnoreCase("in28minutes")
				&& password.equalsIgnoreCase("dummy");
	}

}

src/main/java/com/in28minutes/springboot/web/service/TodoService.java

package com.in28minutes.springboot.web.service;

import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

import org.springframework.stereotype.Service;

import com.in28minutes.springboot.web.model.Todo;

@Service
public class TodoService {
    private static List<Todo> todos = new ArrayList<Todo>();
    private static int todoCount = 3;

    static {
        todos.add(new Todo(1, "in28Minutes", "Learn Spring MVC", new Date(),
                false));
        todos.add(new Todo(2, "in28Minutes", "Learn Struts", new Date(), false));
        todos.add(new Todo(3, "in28Minutes", "Learn Hibernate", new Date(),
                false));
    }

    public List<Todo> retrieveTodos(String user) {
        List<Todo> filteredTodos = new ArrayList<Todo>();
        for (Todo todo : todos) {
            if (todo.getUser().equals(user)) {
                filteredTodos.add(todo);
            }
        }
        return filteredTodos;
    }

    public void addTodo(String name, String desc, Date targetDate,
            boolean isDone) {
        todos.add(new Todo(++todoCount, name, desc, targetDate, isDone));
    }

    public void deleteTodo(int id) {
        Iterator<Todo> iterator = todos.iterator();
        while (iterator.hasNext()) {
            Todo todo = iterator.next();
            if (todo.getId() == id) {
                iterator.remove();
            }
        }
    }
}

src/main/java/com/in28minutes/springboot/web/SpringBootFirstWebApplication.java

package com.in28minutes.springboot.web;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan("com.in28minutes.springboot.web")
public class SpringBootFirstWebApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringBootFirstWebApplication.class, args);
	}
}

src/main/resources/application.properties

spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
logging.level.org.springframework.web=INFO

src/main/webapp/WEB-INF/jsp/list-todos.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<html>

<head>
<title>Todo's for ${name}</title>
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
	rel="stylesheet">
</head>

<body>
	<div class="container">
		<table class="table table-striped">
			<caption>Your todos are</caption>
			<thead>
				<tr>
					<th>Description</th>
					<th>Target Date</th>
					<th>Is it Done?</th>
					<th></th>
				</tr>
			</thead>
			<tbody>
				<c:forEach items="${todos}" var="todo">
					<tr>
						<td>${todo.desc}</td>
						<td>${todo.targetDate}</td>
						<td>${todo.done}</td>
						<td><a type="button" class="btn btn-warning"
							href="/delete-todo?id=${todo.id}">Delete</a></td>
					</tr>
				</c:forEach>
			</tbody>
		</table>
		<div>
			<a class="button" href="/add-todo">Add a Todo</a>
		</div>
	</div>
	
	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>

</body>

</html>

src/main/webapp/WEB-INF/jsp/login.jsp

<html>

<head>
<title>First Web Application</title>
</head>

<body>
	<font color="red">${errorMessage}</font>
	<form method="post">
		Name : <input type="text" name="name" />
		Password : <input type="password" name="password" /> 
		<input type="submit" />
	</form>
</body>

</html>

src/main/webapp/WEB-INF/jsp/todo.jsp

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>

<head>
<title>First Web Application</title>
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
	rel="stylesheet">

</head>

<body>
	<div class="container">
		<form:form method="post" modelAttribute="todo">
			<fieldset class="form-group">
				<form:label path="desc">Description</form:label> 
				<form:input path="desc" type="text"
					class="form-control" required="required"/>
				<form:errors path="desc" cssClass="text-warning"/>
			</fieldset>

			<button type="submit" class="btn btn-success">Add</button>
		</form:form>
	</div>

	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>

</body>

</html>

src/main/webapp/WEB-INF/jsp/welcome.jsp

<html>

<head>
<title>First Web Application</title>
</head>

<body>
	Welcome ${name}!! <a href="/list-todos">Click here</a> to manage your todo's.
</body>

</html>

src/test/java/com/in28minutes/springboot/web/SpringBootFirstWebApplicationTests.java

package com.in28minutes.springboot.web;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootFirstWebApplicationTests {

	@Test
	public void contextLoads() {
	}

}

todo.txt

Implementing Server Side Validation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Command Bean or Form Backing Bean

Add Validation
Use Validation on Controller
Display Errors in View

Command Bean
~~~~~~~~~~~~
Controller
View - Spring Form Tags



LoginController -> adds name to model
welcome.jsp -> shows ${name}

TodoController -> redirects to list-todos.jsp
${name} is empty 


Component, Service, Repository, Controller
Autowired
ComponentScan

Field dummyService in com.in28minutes.springboot.web.controller.LoginController 
required a bean of type 'com.in28minutes.dummy.DummyService' 
that could not be found.

Spring Boot Starter Parent
Spring Boot Starter Web
@SpringBootApplication
Auto Configuration

Dispatcher Servlet

/login => "login"

"login" => src/main/webapp/WEB-INF/jsp/login.jsp 


Search for a view named "login"



/login => LoginController