Thymeleaf 错误以及thymeleafMVC配置，前端代码例子

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springMVC java配置文件配置使用 thymeleaf 的时候一直报这个错：

The type org.thymeleaf.ITemplateEngine cannot be resolved. It is indirectly referenced from required .class files

还以为是引用的JRE版本太低或者太高试了很久也没用，后来发现是由于缺少jar包引起的

缺少：thymeleaf-3.0.3.RELEASE，使用thymeleaf 需要thymeleaf-3.0.3.RELEASE 和thymeleaf-spring4-3.0.3.RELEASE.jar 两个jar包

可见：不只classNotFound 错误是可能缺少jar包，错误引用也可能是缺少jar包

看spring4 in action 根本没说需要什么bean，碰了很多钉子最终得出需要的thyleaf jar 包为：

thymeleaf-3.0.3.RELEASE 、thymeleaf-spring4-3.0.3.RELEASE.jar、attoparser-2.0.0.RELEASE.jar、unbescape-1.0.jar

mvc java 配置代码：

package config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.web.context.ContextLoader;import org.springframework.web.context.WebApplicationContext;import org.springframework.web.servlet.ViewResolver;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import org.thymeleaf.TemplateEngine;import org.thymeleaf.spring4.SpringTemplateEngine;import org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver;import org.thymeleaf.spring4.view.ThymeleafViewResolver;import org.thymeleaf.templatemode.TemplateMode;import org.thymeleaf.templateresolver.ITemplateResolver;import org.thymeleaf.templateresolver.ServletContextTemplateResolver;@EnableWebMvc@ComponentScan(basePackages="controller")@Configurationpublic class MvcConfig extends WebMvcConfigurerAdapter { @Bean      public ITemplateResolver  templateResolver() {           SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();          templateResolver.setTemplateMode("HTML5");          templateResolver.setPrefix("/WEB-INF/thymeleaf/");          templateResolver.setSuffix(".html");          templateResolver.setCharacterEncoding("utf-8");          templateResolver.setOrder(1);            templateResolver.setCacheable(false);          return templateResolver;      }          @Bean      public SpringTemplateEngine templateEngine(ITemplateResolver  templateResolver) {             SpringTemplateEngine templateEngine = new SpringTemplateEngine();              templateEngine.setTemplateResolver(templateResolver);              return templateEngine;      }          @Bean  //    public ViewResolver  viewResolver() {      public ThymeleafViewResolver  viewResolver(TemplateEngine templateEngine) {            ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();          viewResolver.setTemplateEngine(templateEngine);          viewResolver.setCharacterEncoding("utf-8");          return viewResolver;      }   }

前端例子代码：

<!DOCTYPE html>  <html xmlns:th="http://www.thymeleaf.org">  <head>  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  <style type="text/css">label.error{color:red;}input.error{background:yellow}</style></head>  <body>    //th:object 代表命令对象也就是表单要绑定的对象，跟spring form表单绑定标签中commandName 绑定对象类似 //当请求跳转到该页面需要相应的传一个带有key为user的对象，key默认为该对象类型的小写字母开头 //th:action 代表要提交的表单链接, url格式为 @{}   <form th:object="${user}" method="POST" th:action="@{/register}">   //th:if 用来判断表单是否验证有误，有错误则显示出来无错则不显示   <div th:if="${#fields.hasErrors('*')}">   <ul>      //th:each遍历错误并通过ul列表显示出来                   <li th:each="err:${#fields.errors('*')}" th:text="${err}">输入有误</li>   </ul>      </div>//判断该字段是否验证有误，有错误则显示相应的css，该css可自定义  <label th:class="${#fields.hasErrors('username')}?'error'">用户名</label>  <input type="text" th:field="*{username}" th:class="${#fields.hasErrors('username')}?'error'">//th:if 判断如果该字段验证错误，则展示span标签及错误信息，如果无错则不展现  <span th:if="${#fields.hasErrors('username')}" th:text="${#fields.errors('username')}"></span>  <label th:class="${#fields.hasErrors('password')}?'error'">用户名</label>  <input type="text" th:field="*{password}" th:class="${#fields.hasErrors('password')}?'error'">  <input type="submit" value="提交"/>      </form>    </body>  </html>

后台代码controller：

@Controllerpublic class ThyController {@RequestMapping("/toleaf")public String tleaf(Model model){//向前台添加一个命令对象                //默认key为该类型User->小写字母user                //也就是表单中th:object=${user}model.addAttribute(new User());return "tleaf";}@RequestMapping("/register")public String register(@Valid  User user,Errors errors){System.out.println(user.getUsername());if(errors.hasErrors()){return "tleaf";}return "success";}}

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Thymeleaf 错误 以及thymeleafMVC配置，前端代码例子

Thymeleaf 错误以及thymeleafMVC配置，前端代码例子