调用Spring开发的Rest API时获取404

Question

调节器

package com.example;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/ws")
public class Controller {
    @RequestMapping(value="/req", method = RequestMethod.GET,produces="application/json")
    TestBean readBookmarks() {
    TestBean bean = new TestBean("Test", 25);
    return bean;
}
}

在web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" 
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd 
http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" id="WebApp_ID" version="2.4">
<display-name>Spring MVC Application</display-name>
  <servlet>
    <servlet-name>App</servlet-name>
    <servlet-class>  org.springframework.web.servlet.DispatcherServlet</servlet-class
<load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
    <servlet-name>App</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

APP-servlet.xml中

<?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:p="http://www.springframework.org/schema/p"
   xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="
      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-
 context.xsd">

<context:component-scan base-package="com.example"/>
</beans>

当我尝试在浏览器上访问http：// localhost：8080 / ws / req时 ，它显示HTTP状态404。

URL已按照日志中的记录进行注册：

Jun 07, 2017 10:35:39 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:MathWebApp' did not find a matching property.
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version:        Apache Tomcat/8.0.44
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built:          May 10 2017 17:21:09 UTC
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number:         8.0.44.0
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name:               Mac OS X
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version:            10.12.4
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture:          x86_64
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home:             /Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home/jre
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version:           1.8.0_111-b14
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor:            Oracle Corporation
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE:         /Users/kegupta/Documents/Framework/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME:         /Users/kegupta/Desktop/apache-tomcat-8.0.44
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=/Users/kegupta/Documents/Framework/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=/Users/kegupta/Desktop/apache-tomcat-8.0.44
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=/Users/kegupta/Documents/Framework/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=/Users/kegupta/Desktop/apache-tomcat-8.0.44/endorsed
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=UTF-8
Jun 07, 2017 10:35:39 AM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/kegupta/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
Jun 07, 2017 10:35:39 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
Jun 07, 2017 10:35:39 AM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Jun 07, 2017 10:35:39 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-8009"]
Jun 07, 2017 10:35:39 AM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Jun 07, 2017 10:35:39 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 480 ms
Jun 07, 2017 10:35:39 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Jun 07, 2017 10:35:39 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/8.0.44
Jun 07, 2017 10:35:40 AM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Jun 07, 2017 10:35:40 AM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Jun 07, 2017 10:35:40 AM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'App'
Jun 07, 2017 10:35:40 AM org.springframework.web.servlet.DispatcherServlet initServletBean
INFO: FrameworkServlet 'App': initialization started
Jun 07, 2017 10:35:40 AM org.springframework.web.context.support.XmlWebApplicationContext prepareRefresh
INFO: Refreshing WebApplicationContext for namespace 'App-servlet': startup date [Wed Jun 07 10:35:40 IST 2017]; root of context hierarchy
Jun 07, 2017 10:35:40 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/App-servlet.xml]
Jun 07, 2017 10:35:40 AM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/ws/req] onto handler 'controller'
Jun 07, 2017 10:35:40 AM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/ws/req.*] onto handler 'controller'
Jun 07, 2017 10:35:40 AM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/ws/req/] onto handler 'controller'
Jun 07, 2017 10:35:40 AM org.springframework.web.servlet.DispatcherServlet initServletBean
INFO: FrameworkServlet 'App': initialization completed in 617 ms
Jun 07, 2017 10:35:40 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
Jun 07, 2017 10:35:40 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-nio-8009"]
Jun 07, 2017 10:35:40 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1514 ms

很久以来我一直被困住。 任何帮助将不胜感激。

Answer 1

从日志中，我可以看到一个战争名称App正在部署中。 尝试使用以下网址：

http://localhost:8080/App/ws/req 

Or

http://localhost:8080/<deployed tomcat war name>/ws/req 

Answer 2

TestBean readBookmarks() {
TestBean bean = new TestBean("Test", 25);
return bean;

这个函数似乎缺少@ResponseBody，而且TestBean（也许是一个自定义类）不是Spring可序列化的东西。 您能尝试发送String而不是TestBean吗？

此外，部署目录可能与您的web.xml配置不同（即App以外的其他配置）。 您可以尝试加载http：// localhost：8080 / {Dir} / ws / req，其中Dir ==部署目录（！='App'）。

以上两件事可能应该可以解决您的问题。