Spring Boot form validation

Author: giaunv

springboot-examples/springboot-freemarker-form-validation/.gitignore

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+target
+out
+.settings
+.classpath
+.project
+.idea
+*.iml

springboot-examples/springboot-freemarker-form-validation/pom.xml

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+<?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.hellokoding.springboot</groupId>
+    <artifactId>freemarker.form.validation</artifactId>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.4.RELEASE</version>
+    </parent>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-freemarker</artifactId>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

springboot-examples/springboot-freemarker-form-validation/src/main/java/com/hellokoding/springboot/FormController.java

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+package com.hellokoding.springboot;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+
+import javax.validation.Valid;
+
+@Controller
+public class FormController {
+    @GetMapping("/")
+    public String index() {
+        return "redirect:/form";
+    }
+
+    @GetMapping("/form")
+    public String formGet(Model model) {
+        model.addAttribute("user", new User());
+        return "form";
+    }
+
+    @PostMapping("/form")
+    public String formPost(@Valid User user, BindingResult bindingResult, Model model) {
+        if (!bindingResult.hasErrors()) {
+            model.addAttribute("noErrors", true);
+        }
+        model.addAttribute("user", user);
+        return "form";
+    }
+}

springboot-examples/springboot-freemarker-form-validation/src/main/java/com/hellokoding/springboot/User.java

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+package com.hellokoding.springboot;
+
+import javax.validation.constraints.Email;
+import javax.validation.constraints.NotEmpty;
+
+public class User {
+    @NotEmpty
+    private String firstName;
+
+    @NotEmpty
+    private String lastName;
+
+    @NotEmpty
+    @Email
+    private String email;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+}

springboot-examples/springboot-freemarker-form-validation/src/main/java/com/hellokoding/springboot/WebApplication.java

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+package com.hellokoding.springboot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class WebApplication {
+    public static void main(String[] args) throws Exception {
+        SpringApplication.run(WebApplication.class, args);
+    }
+}
+

springboot-examples/springboot-freemarker-form-validation/src/main/resources/application.properties

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+spring.freemarker.template-loader-path: classpath:/templates
+spring.freemarker.suffix: .ftl

springboot-examples/springboot-freemarker-form-validation/src/main/resources/static/css/main.css

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+h2 {
+  color: darkgreen;
+}
+
+form b {
+  color: red;
+}

springboot-examples/springboot-freemarker-form-validation/src/main/resources/static/js/main.js

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+(function(){
+  console.log("Hello World!");
+})();

springboot-examples/springboot-freemarker-form-validation/src/main/resources/templates/form.ftl

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+<#import "/spring.ftl" as spring />
+
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <title>Form Data Binding and Validation</title>
+        <link href="/css/main.css" rel="stylesheet">
+    </head>
+    <body>
+        <h2>Form Data Binding and Validation</h2>
+
+        <@spring.bind "user"/>
+        <#if user?? && noErrors??>
+            Your submitted data<br>
+            First name: ${user.firstName}<br>
+            Last name: ${user.lastName}<br>
+            Email: ${user.email}<br>
+        <#else>
+            <form action="/form" method="post">
+                First name:<br>
+                <@spring.formInput "user.firstName"/>
+                <@spring.showErrors "<br>"/>
+                <br><br>
+                Last name:<br>
+                <@spring.formInput "user.lastName"/>
+                <@spring.showErrors "<br>"/>
+                <br><br>
+                Email:<br>
+                <@spring.formInput "user.email"/>
+                <@spring.showErrors "<br>"/>
+                <br><br>
+                <input type="submit" value="Submit">
+            </form>
+        </#if>
+
+        <script src="/js/main.js"></script>
+    </body>
+</html>