我已经阅读了许多类似的问题，包括：JQuery、Spring MVC @RequestBody 和 JSON - 使其 与 JSON 请求与 JQuery/Ajax 和 Spring一起工作
要求是服务器只接受 application/json 类型。我正在使用 Spring MVC 控制器。代码通过@ResponseBody 将响应以 JSON 形式发回。我想通过我的 Spring MVC 控制器中的 @RequestBody 获取信息。我正在使用 JSP 将 JSON 发送到 Spring MVC 控制器。我的代码和 Spring MVC 如下所示：
我是 JSON 和 Javascript 的新手。
JSP - index.jsp
<%@page language="java" contentType="text/html"%>
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
$('#myForm').on('submit', function(e) {
var frm = $("#myForm");
var dat = JSON.stringify(frm.serializeArray());
$.ajax({
type: 'POST',
url: $('#myForm').attr('action'),
data: dat,
contentType: 'application/json',
dataType: 'json',
error: function() {
alert('failure');
}
success: function(hxr) {
alert("Success: " + xhr);
}
});
);
};
</script>
</head>
<body>
<h2>Application</h2>
<form id="myForm" action="/application/save" method="POST" accept="application/json" onclick="i()">
<input type="text" name="userId" value="User">
<input type="submit" value="Submit">
</form>
</body>
</html>
运行此程序时，我没有得到任何输出。在 Chrome 中我得到 404 Not found 错误，在 Tomcat 中我得到以下错误：
org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver handleNoSuchRequestHandlingMethod
WARNING: No matching handler method found for servlet request: path '/application/sa
ve', method 'POST', parameters map['userId' -> array<String>['User']]
JSP 部分有问题吗？
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd"
version="2.5">
<display-name>WebApp</display-name>
<context-param>
<!-- Specifies the list of Spring Configuration files in comma separated format.-->
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/service.xml</param-value>
</context-param>
<listener>
<!-- Loads your Configuration Files-->
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>application</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>application</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
服务.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:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
<context:component-scan base-package="com.web"/>
<mvc:annotation-driven/>
<context:annotation-config/>
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
<bean id="jacksonMessageChanger" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes" value="application/json"/>
</bean>
<!-- <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="jacksonMessageChanger"/>
</list>
</property>
</bean>-->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<util:list id="beanList">
<ref bean="jacksonMessageChanger"/>
</util:list>
</property>
</bean>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="mediaTypes">
<map>
<entry key="json" value="application/json"/>
</map>
</property>
</bean>-->
控制器
package com.web;
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.ResponseBody;
import org.springframework.web.bind.annotation.RequestBody;
import com.webchannel.domain.User;
import com.webchannel.domain.UserResponse;
@Controller
@RequestMapping("/application/*")
public class SaveController {
@RequestMapping(value = "save", method = RequestMethod.POST, headers = {"content-type=application/json"})
public @ResponseBody UserResponse save(@RequestBody User user) throws Exception {
UserResponse userResponse = new UserResponse();
System.out.println("UserId :" + " " + user.getUserId());
return userResponse;
}
@RequestMapping(value = "delete", method = RequestMethod.GET)
public @ResponseBody UserResponse delete() {
System.out.println("Delete");
UserResponse userResponse = new UserResponse();
userResponse.setSuccess(true);
userResponse.setVersionNumber("1.0");
return userResponse;
} }
调用 /application/delete 时，我会返回 JSON。所以我知道我的 JacksonProcessor 配置正确。问题出在@RequestBody 中。
我哪里错了？
如果我删除下面代码中的标题，我会收到 415 错误。
@RequestMapping(value = "save", method = RequestMethod.POST)
public @ResponseBody UserResponse save(@RequestBody User user) throws Exception {
UserResponse userResponse = new UserResponse();
System.out.println("UserId :" + " " + user.getUserId());
return userResponse;
}
我几乎接近了，但我们将不胜感激。