Question

当我运行TomCat时，映射似乎正确完成了。

控制台的信息：

信息：映射 “{[/ cervejas /从头]}” 到公共java.lang.String中com.algaworks.brewer.controller.CervejasController.novo（）

然而，当我尝试做调用以下网址：本地主机：8080 /啤酒/ cervejas /从头错误HTTP状态404返回

我得到在控制台上的Tomcat如下警告，当我试图访问浏览器映射网址：

警告：没有映射找到HTTP请求与URI [/啤酒/ cervejas / cerveja / CadastroCerveja]在DispatcherServlet的名为 '调度'

还有一个 “目录”（cervejas）的URI。

WebConfig.java文件：

package com.algaworks.brewer.config;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
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 com.algaworks.brewer.controller.CervejasController;

@Configuration
@ComponentScan(basePackageClasses = { CervejasController.class } )
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter implements ApplicationContextAware {

    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public ViewResolver viewResolver() {
        ThymeleafViewResolver resolver = new ThymeleafViewResolver();
        resolver.setTemplateEngine(templateEngine());
        resolver.setCharacterEncoding("UTF-8");
        return resolver;
    }

    @Bean
    public TemplateEngine templateEngine() {
        SpringTemplateEngine engine = new SpringTemplateEngine();
        engine.setEnableSpringELCompiler(true);
        engine.setTemplateResolver(templateResolver());
        return engine;
    }

    private ITemplateResolver templateResolver() {
        SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
        resolver.setApplicationContext(applicationContext);
        resolver.setPrefix("classpath:/templates/");
        resolver.setSuffix(".html");
        resolver.setTemplateMode(TemplateMode.HTML);
        return resolver;
    }

}

CervejasController.java文件：

package com.algaworks.brewer.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class CervejasController {

    @RequestMapping("/cervejas/novo")
    public String novo() {
        return "cerveja/CadastroCerveja";
    }

}

CadastroCerveja.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

<body>
    <h1>Olá ! Thymeleaf configurado.</h1>
</body>

</html>

WebConfig.java文件：

package com.algaworks.brewer.config;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
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 com.algaworks.brewer.controller.CervejasController;

@Configuration
@ComponentScan(basePackageClasses = { CervejasController.class } )
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter implements ApplicationContextAware {

    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public ViewResolver viewResolver() {
        ThymeleafViewResolver resolver = new ThymeleafViewResolver();
        resolver.setTemplateEngine(templateEngine());
        resolver.setCharacterEncoding("UTF-8");
        return resolver;
    }

    @Bean
    public TemplateEngine templateEngine() {
        SpringTemplateEngine engine = new SpringTemplateEngine();
        engine.setEnableSpringELCompiler(true);
        engine.setTemplateResolver(templateResolver());
        return engine;
    }

    private ITemplateResolver templateResolver() {
        SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
        resolver.setApplicationContext(applicationContext);
        resolver.setPrefix("classpath:/templates/");
        resolver.setSuffix(".html");
        resolver.setTemplateMode(TemplateMode.HTML);
        return resolver;
    }

}

Package Explorer：

我无法找到该错误。感谢您的帮助。

Answer 1

您正在尝试访问未在控制器中定义的URL： / brewer / cervejas / novo

如果未在application.properties或某个Configuration Class中为应用程序配置 ContextPath ，则应通过选择以下选项之一：

通过放置application.properties属性在server.servlet.context-path=/brewer文件中定义上下文路径

使您的Controller基本映射点指向/brewer，如下所示：

package com.algaworks.brewer.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/brewer")
public class CervejasController {

    @RequestMapping("/cervejas/novo")
    public String novo() {
        return "cerveja/CadastroCerveja";
    }

}

Answer 2

请尝试将您的请求类型（GET，POST等）添加到控制器方法中，如下所示：

注意：我不知道您要尝试访问URI的请求方法，但我假设它是GET请求。您应该根据需要更改请求类型。

package com.algaworks.brewer.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/brewer")
public class CervejasController {

    @RequestMapping("/cervejas/novo", method = RequestMethod.GET)
    public String novo() {
        return "cerveja/CadastroCerveja";
    }
}

@RequestMapping注解返回错误的URL

2 个答案: