在 Springmvc 和 Thymeleaf 中，出现“无法初始化模板解析器：尚未设置资源解析器]”错误答案

【问题标题】：In Springmvc and Thymeleaf, getting "Cannot initialize template resolver: a resource resolver has not been set]" error在 Springmvc 和 Thymeleaf 中，出现“无法初始化模板解析器：尚未设置资源解析器]”错误
【发布时间】：2017-09-10 07:31:39
【问题描述】：

接下来我会展示一些错误，但首先我会解释一下。根据我的一些输出，创建ViewResolver、SpringTemplateEngine、TemplateResolver bean是没有问题的，然后找到首页，视图名称是“home”，这里没有问题。

然后，根据 thymeleaf 模板，我会得到路径 "/WEB-INF/templates/home.html" 。但这里是错误的。出现以下错误

 Servlet.service() for servlet [dispatcher] in context with path [/Spittr] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.ConfigurationException: Cannot initialize template resolver: a resource resolver has not been set] with root cause
org.thymeleaf.exceptions.ConfigurationException: Cannot initialize template resolver: a resource resolver has not been set
    at org.thymeleaf.templateresolver.TemplateResolver.initializeSpecific(TemplateResolver.java:136)
    at org.thymeleaf.templateresolver.AbstractTemplateResolver.initialize(AbstractTemplateResolver.java:106)
    at org.thymeleaf.Configuration.initialize(Configuration.java:200)
    at org.thymeleaf.TemplateEngine.initialize(TemplateEngine.java:831)
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1122)
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1095)
    at org.thymeleaf.spring3.view.ThymeleafView.renderFragment(ThymeleafView.java:259)
    at org.thymeleaf.spring3.view.ThymeleafView.render(ThymeleafView.java:179)
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244)
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2508)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2497)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

不知道是什么意思，查了很多但不知道怎么解决。我会展示一些豆子：

@Bean
public ViewResolver viewResolver(SpringTemplateEngine templateEngine){
    ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
    viewResolver.setTemplateEngine(templateEngine);
    System.out.println("create:viewResolver");
    return viewResolver;
}

@Bean
public SpringTemplateEngine templateEngine(TemplateResolver templateResolver){
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();
    templateEngine.setTemplateResolver(templateResolver);
    System.out.println("create:templateEngine");
    return templateEngine;
}

@Bean
public TemplateResolver templateResolver(){
    TemplateResolver templateResolver = new TemplateResolver();
    templateResolver.setPrefix("/WEB-INF/templates/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode("HTML5");
    System.out.println("create:templateResolver");
    return templateResolver;
}

下面是我的控制器

@RequestMapping("/")
public class HomeController {
    @RequestMapping(method=GET)
    public String home(){
        System.out.println("control:home");
        return "home";        //view name：home
    }
}}

请帮我看看上面的问题。

【问题讨论】：

标签： java spring-mvc thymeleaf

【解决方案1】：

根据您提供的错误，templateEngine 上没有设置解析器。不要将templateResolver 作为参数传入，而只需在 Bean 方法中创建新实例，如下所示：

@Bean
public ViewResolver viewResolver(){
    ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
    viewResolver.setTemplateEngine(templateEngine());
    System.out.println("create:viewResolver");
    return viewResolver;
}

@Bean
public SpringTemplateEngine templateEngine(){
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();
    templateEngine.setTemplateResolver(templateResolver());
    System.out.println("create:templateEngine");
    return templateEngine;
}

@Bean
public TemplateResolver templateResolver(){
    TemplateResolver templateResolver = new ClassLoaderTemplateResolver();
    templateResolver.setPrefix("/WEB-INF/templates/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode("HTML5");
    System.out.println("create:templateResolver");
    return templateResolver;
}

祝你好运。

【讨论】：

首先感谢您回答我的问题。我根据您的建议修改了配置。但是还是和以前一样的问题。还有什么可能出错的地方吗？
@yjl ，我更新了答案，用ClassLoaderTemplateResolver 修改了你的templateResolver() 方法。或者，如果您使用的是 thymeleaf 3，您也可以尝试SpringResourceTemplateResolver。让我知道它是否适合你。

【解决方案2】：

你可以改变

@Bean
public TemplateResolver templateResolver(){
    TemplateResolver templateResolver = new TemplateResolver(); // This line
    templateResolver.setPrefix("/WEB-INF/templates/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode("HTML5");
    System.out.println("create:templateResolver");
    return templateResolver;
}

到

@Bean
public TemplateResolver templateResolver() {
    TemplateResolver templateResolver = new ServletContextTemplateResolver();
    templateResolver.setPrefix("/WEB-INF/templates/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode("HTML5");
    System.out.println("create:templateResolver");
    return templateResolver;
}

【讨论】：