我是spring mvc的初学者,并在一些在线教程后创建了我自己的应用程序。我按照在线教程在java应用程序中使用jackson mapper,它运行良好。然后我进一步尝试修改它并将其更改为spring mvc项目,以便在用户从Web调用url时发送json数据。
如果我通过与eclipse集成的tomcat服务器运行应用程序,它可以正常工作。但是,当我手动将war文件复制/粘贴到tomcat / webapps文件夹并从bin / tomcat7.exe启动tomcat时,它会给我一个404错误。为什么它会给我404错误,我该如何解决?
请告诉我这里可能做错了什么,这将有助于我了解更多有关spring mvc的信息,谢谢。
PS:我知道stackoverflow关于这个问题有类似的问题,我试着按照它们来解决这个问题,但是没有成功这是我的代码:
的web.xml
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<display-name>Sample Spring Maven Project</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
弹簧-config.xml中
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:component-scan base-package="com.tutorialspoint" />
<mvc:annotation-driven/>
</beans>
HelloController.java
package com.tutorialspoint;
import java.io.IOException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
@Controller
@RequestMapping("/hello")
public class HelloController{
@RequestMapping(method = RequestMethod.GET)
public String printHello() throws JsonGenerationException, JsonMappingException, IOException {
JsonDemo jsonDemo = new JsonDemo();
return jsonDemo.objectToJson();
}
}
的pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>HelloWorld</groupId>
<artifactId>HelloworldProject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>HelloworldProject</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
</dependencies>
</project>
答案 0 :(得分:0)
我想提及您在项目中遇到的几个问题:
1)请使用这个:https://www.springframework.org/schema/beans/spring-beans-4.0.xsd。
可以使用<context:component-scan base-package="com.tutorialspoint" />
和<mvc:annotation-driven/>
,但您使用的是Spring 4.2.0,但您的配置文件使用的是旧的3.0 xsd。
为了帮助您处理Spring配置,我将在此处发布:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.tutorialspoint" />
<mvc:annotation-driven/>
</beans>
2)我强烈建议您迁移到servlet 3.0 / 3.1。基本上它意味着更改web.xml标题:
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<display-name>Sample Spring Maven Project</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-config.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
请注意一些重要的变化:
3)在pom.xml中添加一些其他依赖项:
<!-- Spring dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
这可以帮助你处理mvc。
如果您可以测试所有这些并提供完整的catalina日志,包括部署,这将有助于解决问题。
4)控制器类:
package com.tutorialspoint;
import java.io.IOException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
@RestController
public class HelloController{
@RequestMapping(value = "/hello", method = RequestMethod.GET)
public String printHello() throws JsonGenerationException, JsonMappingException, IOException {
JsonDemo jsonDemo = new JsonDemo();
return jsonDemo.objectToJson();
}
}