英文:
How to fix "noHandlerFound" in SpringMVC
问题
以下是 spring-mvc-demo-servlet.xml 文件的翻译：
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd"><!-- 步骤 3: 添加组件扫描支持 --><context:component-scan base-package="com.robert.springdemo" /><!-- 步骤 4: 添加支持转换、格式化和验证的支持 --><mvc:annotation-driven/><!-- 步骤 5: 定义 Spring MVC 视图解析器 --><beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/view/" /><property name="suffix" value=".jsp" /></bean></beans>
以下是 web.xml 文件的翻译：
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://xmlns.jcp.org/xml/ns/javaee"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"id="WebApp_ID" version="3.1"><display-name>spring-mvc-demo</display-name><absolute-ordering /><!-- Spring MVC 配置 --><!-- 步骤 1: 配置 Spring MVC Dispatcher Servlet --><servlet><servlet-name>dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/spring-mvc-demo-servlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><!-- 步骤 2: 设置 Spring MVC Dispatcher Servlet 的 URL 映射 --><servlet-mapping><servlet-name>dispatcher</servlet-name><url-pattern>/</url-pattern></servlet-mapping></web-app>
以下是控制器 Java 文件的翻译：
public class HelloWorldController {// 需要一个控制器方法来显示初始的 HTML 表单@RequestMapping("/showForm")public String showForm() {return "helloworld-form";}}
当我尝试在服务器上运行它时，我会得到以下错误：
org.springframework.web.servlet.DispatcherServlet noHandlerFoundWARNING: No mapping for GET /spring-mvc-demo/showForm
我是 Spring MVC 的新手，我认为这与组件扫描有关，但我已在 XML 文件中添加了组件扫描。
谢谢。
英文:
Here's the spring-mvc-demo-servlet.xml:
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd"><!-- Step 3: Add support for component scanning --><context:component-scan base-package="com.robert.springdemo" /><!-- Step 4: Add support for conversion, formatting and validation support --><mvc:annotation-driven/><!-- Step 5: Define Spring MVC view resolver --><beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/view/" /><property name="suffix" value=".jsp" /></bean></beans>
Here's the web.xml:
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://xmlns.jcp.org/xml/ns/javaee"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"id="WebApp_ID" version="3.1"><display-name>spring-mvc-demo</display-name><absolute-ordering /><!-- Spring MVC Configs --><!-- Step 1: Configure Spring MVC Dispatcher Servlet --><servlet><servlet-name>dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/spring-mvc-demo-servlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><!-- Step 2: Set up URL mapping for Spring MVC Dispatcher Servlet --><servlet-mapping><servlet-name>dispatcher</servlet-name><url-pattern>/</url-pattern></servlet-mapping></web-app>
Here's the Controller java file
public class HelloWorldController {// need a controller method to show the initial HTML form@RequestMapping("/showForm")public String showForm() {return "helloworld-form";}}
When I try to run it on the server I'll get this error:
org.springframework.web.servlet.DispatcherServlet noHandlerFoundWARNING: No mapping for GET /spring-mvc-demo/showForm
I'm new to SpringMVC, I thought it has something to do with component scanning but I've added component-scan in the xml file.
Thanks.
答案1
得分: 0
尝试这样做：
@RequestMapping("/spring-mvc-demo")public class HelloWorldController {// 需要一个控制器方法来显示初始的HTML表单@RequestMapping("/showForm")public String showForm() {return "helloworld-form";}}
使用当前的设置，您需要访问GET /showForm，然后它将起作用。
请还检查其他映射方式，如GetMapping、PostMapping、PutMapping、DeleteMapping、PatchMapping等等。
英文:
Try this:
@RequestMapping("/spring-mvc-demo")public class HelloWorldController {// need a controller method to show the initial HTML form@RequestMapping("/showForm")public String showForm() {return "helloworld-form";}}
With your current setup you need to hit GET /showForm then it will work.
Please also check other ways of mapping like, GetMapping, PostMapping, PutMapping, DeleteMapping, PatchMapping and others
答案2
得分: 0
将原始的JRE库更改为Eclipse中的JRE系统库。
英文:
Changing the original JRE library to JRE System Library in eclipse
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