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ThymeleafのDiarectサンプル：TextAreaに入力された改行つきテキストを HTMLのbreakをつけて出力する
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| <!DOCTYPE html> | |
| <html xmlns:th="http://www.thymeleaf.org"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" | |
| content="width=device-width, initial-scale=1, shrink-to-fit=no" /> | |
| <title>Title</title> | |
| <link rel="stylesheet" th:href="@{/webjars/bootstrap/{version}/css/bootstrap.min.css(version=${@webjarsConfig.bootstrap})}" /> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <form th:action="@{/textarea}" method="post"> | |
| <textarea name="sample" cols="30" rows="3" th:text="${sample}"></textarea> | |
| <input type="submit" value="送信" class="btn btn-primary"> | |
| </form> | |
| <th:block th:utext="${#textarea.convertBreak(sample)}" /> | |
| </div> | |
| <script th:src="@{/webjars/jquery/{version}/jquery.min.js(version=${@webjarsConfig.jquery})}"></script> | |
| <script th:src="@{/webjars/bootstrap/{version}/js/bootstrap.min.js(version=${@webjarsConfig.bootstrap})}"></script> | |
| </body> | |
| </html> |
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| package com.github.apz.config; | |
| import java.util.Arrays; | |
| import java.util.stream.Collectors; | |
| import org.springframework.util.StringUtils; | |
| public class TextArea { | |
| final static String LINE_SEPARATOR = "\r\n"; | |
| public String convertBreak(final Object object) { | |
| if (object == null) { | |
| return null; | |
| } | |
| String value = object.toString(); | |
| if (StringUtils.isEmpty(value)) { | |
| return value; | |
| } | |
| return Arrays.stream(value.split(LINE_SEPARATOR)).map(v -> v + "<br />").collect(Collectors.joining()); | |
| } | |
| } |
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| package com.github.apz.controller; | |
| import org.springframework.stereotype.Controller; | |
| import org.springframework.web.bind.annotation.GetMapping; | |
| import org.springframework.web.bind.annotation.PostMapping; | |
| import org.springframework.web.bind.annotation.RequestMapping; | |
| import org.springframework.web.bind.annotation.RequestParam; | |
| import org.springframework.web.servlet.ModelAndView; | |
| @RequestMapping("/textarea") | |
| @Controller | |
| public class TextAreaController { | |
| @GetMapping("") | |
| public ModelAndView display(ModelAndView mnv) { | |
| mnv.setViewName("textarea"); | |
| return mnv; | |
| } | |
| @PostMapping("") | |
| public ModelAndView post(ModelAndView mnv, @RequestParam String sample) { | |
| mnv.addObject("sample", sample); | |
| mnv.setViewName("textarea"); | |
| return mnv; | |
| } | |
| } |
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| package com.github.apz.config; | |
| import java.util.HashSet; | |
| import java.util.Set; | |
| import org.thymeleaf.context.IExpressionContext; | |
| import org.thymeleaf.dialect.IExpressionObjectDialect; | |
| import org.thymeleaf.expression.IExpressionObjectFactory; | |
| public class TextAreaDiarect implements IExpressionObjectDialect { | |
| static final String name = "textarea"; | |
| HashSet<String> names = new HashSet<String>() { | |
| {add(name);} | |
| }; | |
| @Override | |
| public String getName() { | |
| return "textAreaDiarect"; | |
| } | |
| @Override | |
| public IExpressionObjectFactory getExpressionObjectFactory() { | |
| return new IExpressionObjectFactory() { | |
| @Override | |
| public Set<String> getAllExpressionObjectNames() { | |
| return names; | |
| } | |
| @Override | |
| public Object buildObject(IExpressionContext context, String expressionObjectName) { | |
| if (name.equals(expressionObjectName)) return new TextArea(); | |
| return null; | |
| } | |
| @Override | |
| public boolean isCacheable(String expressionObjectName) { | |
| return true; | |
| } | |
| }; | |
| } | |
| } |
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| package com.github.apz.config; | |
| import org.springframework.context.annotation.Bean; | |
| import org.springframework.context.annotation.Configuration; | |
| @Configuration | |
| public class ThymeleafConfig { | |
| @Bean | |
| public TextAreaDiarect textAreaDiarect() { | |
| return new TextAreaDiarect(); | |
| } | |
| } |
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