No mapping found for HTTP request with URI [...] in DispatcherServlet with name ‘DispatcherServlet‘
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2022-07-15 13:25:47
...
该错误出现在SpringMVC中，利用ajax和json获取集合类型参数时产生的。
代码
由jsp页面产生数据，并传递给Controller层。
<head>
<title>Title</title>
<script src="${pageContext.request.contextPath}/js/jquery-3.3.1.js"></script>
<script>
var userList = new Array();
userList.push({username:"zhangsan",age:18});
userList.push({username:"lisi",age:28});
$.ajax({
dataType:'json',
type:"POST",
url:"${pageContext.request.contextPath}/user/quick14",
data:JSON.stringify(userList),
contentType:"application/json;charset=UTF-8"
});
</script>
</head>
接收：
@Controller
public class UserController {
@RequestMapping("/quick2")
@ResponseBody
public void save2(@RequestBody List<User> userList){
System.out.println(userList);
}
}
spring-mvc.xml中：
<context:component-scan base-package="nuc.ss.Controller"/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- /jsp/success.jsp -->
<property name="prefix" value="/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<mvc:resources mapping="/js/**" location="/js/"/>
注意点
①如果在Controller层的对应方法上，没有写 @ResponseBody ，那么就会直接导致该错误。
②注意扫描注解时，对应的包一定要正确。
③一定要加载静态资源 <mvc:resources mapping="/js/**" location="/js/"/>
后来又出现了该问题，我把加载静态资源的配置语句 <mvc:resources mapping="/js/**" location="/js/"/>
去掉之后，竟然可以了，不知道什么情况。
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