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tapankavasthiKevinGilmore
tapankavasthi
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KevinGilmore
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BAEL-3284: Guide to Flash Attributes in a Spring Web Application (eugenp#8070)
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‎spring-mvc-simple-2/src/main/java/com/baeldung/flash_attributes/Application.java

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package com.baeldung.flash_attributes;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
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@SpringBootApplication
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public class Application extends SpringBootServletInitializer {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}

‎spring-mvc-simple-2/src/main/java/com/baeldung/flash_attributes/controllers/PoemSubmission.java

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package com.baeldung.flash_attributes.controllers;
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import com.baeldung.flash_attributes.model.Poem;
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import org.springframework.stereotype.Controller;
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import org.springframework.ui.Model;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.ModelAttribute;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.servlet.mvc.support.RedirectAttributes;
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import org.springframework.web.servlet.support.RequestContextUtils;
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import org.springframework.web.servlet.view.RedirectView;
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import java.util.Map;
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import javax.servlet.http.HttpServletRequest;
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@Controller
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public class PoemSubmission {
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@GetMapping("/poem/success")
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public String getSuccess(HttpServletRequest request) {
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Map<String, ?> inputFlashMap = RequestContextUtils.getInputFlashMap(request);
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if (inputFlashMap != null) {
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Poem poem = (Poem) inputFlashMap.get("poem");
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return "success";
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} else {
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return "redirect:/poem/submit";
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}
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}
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@PostMapping("/poem/submit")
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public RedirectView submitPost(
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HttpServletRequest request,
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@ModelAttribute Poem poem,
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RedirectAttributes redirectAttributes) {
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if (Poem.isValidPoem(poem)) {
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redirectAttributes.addFlashAttribute("poem", poem);
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return new RedirectView("/poem/success", true);
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} else {
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return new RedirectView("/poem/submit", true);
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}
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}
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@GetMapping("/poem/submit")
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public String submitGet(Model model) {
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model.addAttribute("poem", new Poem());
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return "submit";
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}
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}

‎spring-mvc-simple-2/src/main/java/com/baeldung/flash_attributes/model/Poem.java

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package com.baeldung.flash_attributes.model;
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import org.apache.logging.log4j.util.Strings;
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public class Poem {
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private String title;
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private String author;
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private String body;
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public static boolean isValidPoem(Poem poem) {
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return poem != null && Strings.isNotBlank(poem.getAuthor()) && Strings.isNotBlank(poem.getBody())
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&& Strings.isNotBlank(poem.getTitle());
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}
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public String getTitle() {
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return this.title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public String getBody() {
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return this.body;
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}
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public void setBody(String body) {
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this.body = body;
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}
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public String getAuthor() {
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return this.author;
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}
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public void setAuthor(String author) {
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this.author = author;
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}
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}

‎spring-mvc-simple-2/src/main/resources/application.properties

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spring.main.allow-bean-definition-overriding=true
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spring.mail.host=localhost
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spring.mail.port=8025
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spring.mail.port=8025
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spring.thymeleaf.cache=false
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spring.thymeleaf.enabled=true
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spring.thymeleaf.prefix=classpath:/templates/
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spring.thymeleaf.suffix=.html

‎spring-mvc-simple-2/src/main/resources/templates/submit.html

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<!DOCTYPE HTML>
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<title>Poetry Contest: Submission</title>
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</head>
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<body>
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<form action="#" method="post" th:action="@{/poem/submit}" th:object="${poem}">
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<table border='0' cellpadding='2' cellspacing='2' width='480px'>
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<tr>
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<td align='center'>
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<label for="author">Author:</label>
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</td>
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<td>
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<input th:field="*{author}" type="text"/>
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</td>
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</tr>
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<tr>
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<td align='center'>
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<label for="title">Poem Title:</label>
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</td>
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<td>
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<input th:field="*{title}" type="text"/>
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</td>
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</tr>
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<tr>
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<td align='center'>
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<label for="body">Poem:</label>
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</td>
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<td>
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<textarea cols="30" rows="30" th:field="*{body}"/>
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</td>
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</tr>
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<tr>
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<td align='center'>
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<input type="submit" value="Submit Poem">
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</td>
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</tr>
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</table>
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</form>
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</body>
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</html>

‎spring-mvc-simple-2/src/main/resources/templates/success.html

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<!DOCTYPE HTML>
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<title>Poetry Contest: Thank You</title>
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</head>
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<body>
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<h1 th:if="${poem}">
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<p th:text="${'You have successfully submitted poem titled - '+ poem?.title}"/>
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Click <a th:href="@{/poem/submit}"> here</a> to submit more.
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</h1>
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<h1 th:unless="${poem}">
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Click <a th:href="@{/poem/submit}"> here</a> to submit a poem.
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</h1>
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</body>
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</html>

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