java – Spring mvc控制器问题

2019年8月3日 109次阅读

我正在努力学习
Spring MVC,到目前为止一直很好,但我现在有点困惑了.我正在尝试学习如何创建json并使用javascript(jquery)来获取它.

但出于测试目的,我试图创建一些东西,所以我可以看到通过http请求正确显示,然后我将尝试创建json并获得它,但到目前为止,我甚至无法得到请求工作.这是我的控制器：

@Controller
@RequestMapping(value="/")
public class IndexController {

@RequestMapping(method=RequestMethod.GET)
    public String index() {
          return "index";
    }

Map<Long,Item> itemMap = createItemMap();

@RequestMapping(value="item/{itemId}", method=RequestMethod.GET)
    public @ResponseBody Item get(@PathVariable Long itemId) {
        Item item = itemMap.get(itemId);
        if (status == null) {
            throw new ResourceNotFoundException(itemId);
        }
        return item;
    }

private Map<Long,Item> createItemMap(){
//omitted because its irrelevant
//I created 2 item objects , with id 1 and 2 for testing purposes
}

}

这是我的servlet-context.xml的内容：

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xsi:schemaLocation="
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>

    <!-- Imports user-defined @Controller beans that process client requests -->
    <beans:import resource="controllers.xml" />

</beans:beans>

和controllers.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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- Scans within the base package of the application for @Components to configure as beans -->
    <context:component-scan base-package="com.testing.mvc.controller" />

        <!-- Application Message Bundle -->
    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="/WEB-INF/messages/messages" />
        <property name="cacheSeconds" value="0" />
    </bean>

</beans>

我的战争叫做Test.war,当我尝试localhost：8080 / Test我得到索引视图就可以了.但无论我尝试什么：

localhost:8080/Test/item/1
 localhost:8080/Test/item?itemId=1
 localhost:8080/item?itemId=1

我最终得到了一些错误,最有趣的是这一个：

The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers ().

我用google搜索了很多有趣的东西：

http://blog.springsource.com/2010/01/25/ajax-simplifications-in-spring-3-0/
https://src.springframework.org/svn/spring-samples/mvc-ajax/trunk/
Mapping restful ajax requests to spring
Spring’s Json not being resolved with appropriate response

到目前为止没有任何帮助,任何我想念的东西.很抱歉提供了太多信息.

最佳答案 据我所知,你在调度员serlet中错过了这样的解析器：

<bean name="jsonViewResolver" class="org.springframework.web.servlet.view.XmlViewResolver">
    <property name="order" value="1"/>
 </bean>

看看这个：
http://spring-json.sourceforge.net/quick_simpleform.html

您必须使用以下内容在yoru WEB-INF目录中创建文件views.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
      "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
    <bean name="jsonView" class="org.springframework.web.servlet.view.json.JsonView"/>
</beans>
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