Question

我想使用Spring MVC来构建RESTful应用程序。我使用POST方法时遇到404错误，但是没有使用GET。我相信在配置或控制器方法中肯定会有一些错误。

当我使用GET方法时，我将JSON数据返回给客户端，当我使用POST方法时，客户端将JSON数据发布到服务器，服务器应将收到的JSON数据发送回客户端。但是，GET方法会运行，但POST方法会出现404错误。

的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/javaee"            
           xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
           http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID"  
  version="3.0">
    <display-name>JiecaoServer</display-name>

    <servlet>
  <servlet-name>jiecaoServer</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
  <servlet-name>jiecaoServer</servlet-name>
  <url-pattern>/</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
     <welcome-file>index.html</welcome-file>
    </welcome-file-list>
 </web-app>

jiecaoServer-servlet.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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-3.1.xsd
           http://www.springframework.org/schema/mvc 
           http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
           http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context-3.1.xsd">  

<!-- mvc:annotation-driven /-->
  <context:component-scan base-package="jiecao.server.controller" />
  <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
  <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <ref bean="jsonConverter" />
        </list>
    </property>
  </bean>

  <bean id="jsonConverter" 
    class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    <property name="supportedMediaTypes" value="application/json" />    
  </bean>
</beans>

控制器类是RestfulTest.java

package jiecao.server.controller;

import java.util.HashMap;

import jiecao.server.dao.User;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
public class RestfulTest {

    @RequestMapping(method=RequestMethod.GET, value="/test/{id}")
    @ResponseBody
        public User getById(@PathVariable int id){
        User u = new User();
        u.setId(id);
        u.setNickname("asdawdawd");
        return u;
    }

    @RequestMapping(method=RequestMethod.POST, value="/test",
        headers="Accept=application/json")
        public @ResponseBody User addUser(@RequestBody HashMap msg){
        System.out.println("Hererererererere");
        //user.setName(user.getNickname());
        User user = new User();
        user.setId(Integer.parseInt((String)msg.get("id")));
        user.setNickname((String)msg.get("nickname"));
        return user;
    }
}

Answer 1

与Thiago所说的一致。你可能会删除headers =＆＃34; Accept = application / json＆＃34;完全只是为了验证这是不是你得到404的原因。

我唯一的另一个建议是下载spring源代码并开始调试。从org.springframework.web.servlet.DispatcherServlet类开始。

Answer 2

您的@ReqestMapping正在寻找包含此http标头的帖子：

headers="Accept=application/json"

您是否在请求中设置此标头？如果没有，你将获得404。

Spring MVC中的404错误

2 个答案: