Spring Boot Thymeleaf Ajax Example

This Spring Boot Thymeleaf Ajax Example will shows you how to create a simple web application based on Spring Boot and Thymeleaf template + jQuery.ajax. Here, we are using jQuery.ajax function to send a request to Spring REST API and return a JSON response.

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2 Spring Boot Thymeleaf Ajax Example

Project Structure
In the Spring Boot Thymeleaf Ajax Example, our project is with this structure below

Spring Boot Thymeleaf Ajax Example

Maven Dependency
In the Spring Boot Thymeleaf Ajax Example, we are using A normal Spring Boot Thymeleaf starter dependency and some webjars resources.

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.javabycode</groupId>
    <artifactId>spring-boot-thymeleaf-ajax-example</artifactId>
    <packaging>jar</packaging>
    <version>1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath></relativePath>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

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

        <!-- hot swapping, enable live reload -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>2.2.4</version>
        </dependency>

        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
            <version>3.3.7</version>
        </dependency>

    </dependencies>

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

</project>

<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/maven-v4_0_0.xsd">

<groupId>com.javabycode</groupId>

<artifactId>spring-boot-thymeleaf-ajax-example</artifactId>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>1.5.2.RELEASE</version>

</parent>

<java.version>1.8</java.version>

</properties>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-devtools</artifactId>

</dependency>

<groupId>org.webjars</groupId>

<artifactId>jquery</artifactId>

</dependency>

<groupId>org.webjars</groupId>

<artifactId>bootstrap</artifactId>

</dependency>

</dependencies>

<build>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>

</project>

Create Spring Controller
We create a simple controller to display login page

package com.javabycode.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class MyController {

    private final Logger logger = LoggerFactory.getLogger(MyController.class);

    @GetMapping("/")
    public String index() {
        return "login";
    }

}

package com.javabycode.controller;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

@Controller

public class MyController {

private final Logger logger = LoggerFactory.getLogger(MyController.class);

@GetMapping("/")

public String index() {

return "login";

}

Create Spring REST API
We create a REST API which accepts a submit request on the login form and return the result using ResponseEntity format.

package com.javabycode.controller;

import com.javabycode.model.AjaxResponseBody;
import com.javabycode.model.LoginForm;
import com.javabycode.model.User;
import com.javabycode.services.UserService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@RestController
public class MyRestController {

	UserService userService;

	@Autowired
	public void setUserService(UserService userService) {
		this.userService = userService;
	}

	@PostMapping("/api/login")
    public ResponseEntity<?> getSearchResultViaAjax(@Valid @RequestBody LoginForm loginForm, Errors errors) {

        AjaxResponseBody result = new AjaxResponseBody();

        //If error, just return a 400 bad request, along with the error message
        if (errors.hasErrors()) {

            result.setMsg(errors.getAllErrors()
                    .stream().map(x -> x.getDefaultMessage())
                    .collect(Collectors.joining(",")));
            return ResponseEntity.badRequest().body(result);

        }

        List<User> users = userService.login(loginForm);
        if (users.isEmpty()) {
            result.setMsg("no user found!");
        } else {
            result.setMsg("success");
        }
        result.setResult(users);

        return ResponseEntity.ok(result);

    }
}

package com.javabycode.controller;

import com.javabycode.model.AjaxResponseBody;

import com.javabycode.model.LoginForm;

import com.javabycode.model.User;

import com.javabycode.services.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.http.ResponseEntity;

import org.springframework.validation.Errors;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

import java.util.ArrayList;

import java.util.List;

import java.util.stream.Collectors;

@RestController

public class MyRestController {

UserService userService;

@Autowired

public void setUserService(UserService userService) {

this.userService = userService;

}

@PostMapping("/api/login")

public ResponseEntity<?> getSearchResultViaAjax(@Valid @RequestBody LoginForm loginForm, Errors errors) {

AjaxResponseBody result = new AjaxResponseBody();

//If error, just return a 400 bad request, along with the error message

if (errors.hasErrors()) {

result.setMsg(errors.getAllErrors()

.stream().map(x -> x.getDefaultMessage())

.collect(Collectors.joining(",")));

return ResponseEntity.badRequest().body(result);

}

List<User> users = userService.login(loginForm);

if (users.isEmpty()) {

result.setMsg("no user found!");

} else {

result.setMsg("success");

}

result.setResult(users);

return ResponseEntity.ok(result);

}

Create some POJO

AjaxResponseBody POJO

package com.javabycode.model;

import java.util.List;

public class AjaxResponseBody {

    String msg;
    List<User> result;

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public List<User> getResult() {
        return result;
    }

    public void setResult(List<User> result) {
        this.result = result;
    }

}

package com.javabycode.model;

import java.util.List;

public class AjaxResponseBody {

String msg;

List<User> result;

public String getMsg() {

return msg;

}

public void setMsg(String msg) {

this.msg = msg;

}

public List<User> getResult() {

return result;

}

public void setResult(List<User> result) {

this.result = result;

}

User POJO

package com.javabycode.model;

public class User {

    String username;
    String password;
    String email;

    public User(String username, String password, String email) {
        this.username = username;
        this.password = password;
        this.email = email;
    }

    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", email='" + email + '\'' +
                '}';
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

package com.javabycode.model;

public class User {

String username;

String password;

String email;

public User(String username, String password, String email) {

this.username = username;

this.password = password;

this.email = email;

}

@Override

public String toString() {

return "User{" +

"username='" + username + '\'' +

", password='" + password + '\'' +

", email='" + email + '\'' +

'}';

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

Form Validation
The form data will be validated by using JSR 303 validation

package com.javabycode.model;

import org.hibernate.validator.constraints.NotBlank;

public class LoginForm {

    @NotBlank(message = "username can't empty!")
    String username;

    @NotBlank(message = "password can't empty!")
    String password;

    
    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
    
    public void setPassword(String password) {
		this.password = password;
	}
    
    public String getPassword() {
		return password;
	}
    
}

package com.javabycode.model;

import org.hibernate.validator.constraints.NotBlank;

public class LoginForm {

@NotBlank(message = "username can't empty!")

String username;

@NotBlank(message = "password can't empty!")

String password;

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public void setPassword(String password) {

this.password = password;

}

public String getPassword() {

return password;

}

A service to validate a valid user
Our service will find user information from database or other resources

package com.javabycode.services;

import com.javabycode.model.User;
import com.javabycode.model.LoginForm;

import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class UserService {

    private List<User> users;

    public List<User> login(LoginForm loginForm) {

        //do stuffs
    	//dump user data
    	User user = new User(loginForm.getUsername(), loginForm.getPassword(), "email@javabycode.com");
    	
        return new ArrayList<User>(Arrays.asList(user));

    }

}

package com.javabycode.services;

import com.javabycode.model.User;

import com.javabycode.model.LoginForm;

import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.stream.Collectors;

@Service

public class UserService {

private List<User> users;

public List<User> login(LoginForm loginForm) {

//do stuffs

//dump user data

User user = new User(loginForm.getUsername(), loginForm.getPassword(), "email@javabycode.com");

return new ArrayList<User>(Arrays.asList(user));

}

Spring Boot Web Application
Don’t forget to create the Spring Boot Web Application and sometimes it is call to be Spring Boot Starter

package com.javabycode;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootWebApplication {

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

}

package com.javabycode;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class SpringBootWebApplication {

public static void main(String[] args) throws Exception {

SpringApplication.run(SpringBootWebApplication.class, args);

}

HTML form using Thymeleaf template
In our Spring Boot Thymeleaf Ajax Example, we create a simple HTML form uing the Thymeleaf template and bootstrap css.

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

<head>
    <title>Spring Boot Thymeleaf AJAX example</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>

    <link rel="stylesheet" type="text/css"
          href="webjars/bootstrap/3.3.7/css/bootstrap.min.css"/>
</head>
<body>

<div class="container" style="min-height: 500px">

    <div class="starter-template">
        <h1>Spring Boot Thymeleaf AJAX Example</h1>        

        <form class="form-horizontal" id="login-form">
            <div class="form-group form-group-lg">
                <label class="col-sm-2 control-label">Username</label>
                <div class="col-sm-6">
                    <input type="text" class="form-control" id="username"/>
                </div>
            </div>

			<div class="form-group form-group-lg">
                <label class="col-sm-2 control-label">Password</label>
                <div class="col-sm-6">
                    <input type="password" class="form-control" id="password"/>
                </div>
            </div>

            <div class="form-group">
                <div class="col-sm-offset-2 col-sm-6">
                    <button type="submit" id="bth-login"
                            class="btn btn-primary btn-lg">Login
                    </button>
                </div>
            </div>
        </form>

	<div id="feedback"></div>
    </div>

</div>

<script type="text/javascript"
        src="webjars/jquery/2.2.4/jquery.min.js"></script>

<script type="text/javascript" src="js/ajax_functions.js"></script>

</body>
</html>

<!DOCTYPE html>

<head>

<title>Spring Boot Thymeleaf AJAX example</title>

href="webjars/bootstrap/3.3.7/css/bootstrap.min.css"/>

</head>

<body>

<h1>Spring Boot Thymeleaf AJAX Example</h1>

<label class="col-sm-2 control-label">Username</label>

</div>

<label class="col-sm-2 control-label">Password</label>

</div>

<button type="submit" id="bth-login"

class="btn btn-primary btn-lg">Login

</button>

</div>

</form>

</div>

src="webjars/jquery/2.2.4/jquery.min.js"></script>

</body>

</html>

Ajax submit function
Gets HTML form then convert form data into JSON format via JSON.stringify, and send POST request using the jQuery.ajax function

$(document).ready(function () {

    $("#login-form").submit(function (event) {

        //stop submit the form event. Do this manually using ajax post function
        event.preventDefault();

        var loginForm = {}
        loginForm["username"] = $("#username").val();
        loginForm["password"] = $("#password").val();

        $("#btn-login").prop("disabled", true);
        
        $.ajax({
            type: "POST",
            contentType: "application/json",
            url: "/api/login",
            data: JSON.stringify(loginForm),
            dataType: 'json',
            cache: false,
            timeout: 600000,
            success: function (data) {

                var json = "<h4>Ajax Response</h4><pre>"
                    + JSON.stringify(data, null, 4) + "</pre>";
                $('#feedback').html(json);

                console.log("SUCCESS : ", data);
                $("#btn-login").prop("disabled", false);

            },
            error: function (e) {

                var json = "<h4>Ajax Response Error</h4><pre>"
                    + e.responseText + "</pre>";
                $('#feedback').html(json);

                console.log("ERROR : ", e);
                $("#btn-login").prop("disabled", false);

            }
        });
        
    });

});

$(document).ready(function () {

$("#login-form").submit(function (event) {

//stop submit the form event. Do this manually using ajax post function

event.preventDefault();

var loginForm = {}

loginForm["username"] = $("#username").val();

loginForm["password"] = $("#password").val();

$("#btn-login").prop("disabled", true);

$.ajax({

type: "POST",

contentType: "application/json",

url: "/api/login",

data: JSON.stringify(loginForm),

dataType: 'json',

cache: false,

timeout: 600000,

success: function (data) {

var json = "<h4>Ajax Response</h4><pre>"

+ JSON.stringify(data, null, 4) + "</pre>";

$('#feedback').html(json);

console.log("SUCCESS : ", data);

$("#btn-login").prop("disabled", false);

error: function (e) {

var json = "<h4>Ajax Response Error</h4><pre>"

+ e.responseText + "</pre>";

$('#feedback').html(json);

console.log("ERROR : ", e);

$("#btn-login").prop("disabled", false);

}

});

Demo Spring application
Go to the project directory and run the command line

mvn spring-boot:run

1	mvn spring-boot:run

Then the successful screen should be like this:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.2.RELEASE)

2017-04-07 23:06:32 INFO  c.j.SpringBootWebApplication - Starting SpringBootWebA
pplication
2017-04-07 23:06:32 DEBUG c.j.SpringBootWebApplication - Running with Spring Boo
t v1.5.2.RELEASE, Spring v4.3.7.RELEASE
2017-04-07 23:06:32 INFO  c.j.SpringBootWebApplication - No active profile set,
falling back to default profiles: default
2017-04-07 23:06:58 INFO  c.j.SpringBootWebApplication - Started SpringBootWebAp
plication in 27.88 seconds (JVM running for 30.686)

. ____ _ __ _ _

/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

\\/ ___)| |_)| | | | | || (_| | ) ) ) )

' |____| .__|_| |_|_| |_\__, | / / / /

=========|_|==============|___/=/_/_/_/

:: Spring Boot :: (v1.5.2.RELEASE)

2017-04-07 23:06:32 INFO c.j.SpringBootWebApplication - Starting SpringBootWebA

pplication

2017-04-07 23:06:32 DEBUG c.j.SpringBootWebApplication - Running with Spring Boo

t v1.5.2.RELEASE, Spring v4.3.7.RELEASE

2017-04-07 23:06:32 INFO c.j.SpringBootWebApplication - No active profile set,

falling back to default profiles: default

2017-04-07 23:06:58 INFO c.j.SpringBootWebApplication - Started SpringBootWebAp

plication in 27.88 seconds (JVM running for 30.686)

Now, let’s access the address http://localhost:8080/ and the login form looks like below

Spring Boot Thymeleaf Ajax Example

Submit the login form without data, the validation error should display

Spring Boot Thymeleaf Ajax Example

Enter username/password on the form

Spring Boot Thymeleaf Ajax Example

Then click submit button, the user information is displayed when the login is successful

Spring Boot Thymeleaf Ajax Example

That’s all on the Spring Boot Thymeleaf Ajax Example. You may be interested in Spring Boot Thymeleaf Hello World Example.

References
Spring IO – Building a RESTful Web Service
MDN – JSON.stringify()

Download complete source code, click link below

spring-boot-thymeleaf-ajax-example.zip (966 downloads)

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