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java - 将 JSON 发送到 Spring MVC Controller

转载 作者:行者123 更新时间:2023-11-30 09:32:50 27 4
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我正在尝试将 JSON 发送到 Spring MVC Controller 。在 Spring MVC 端,一切都已正确配置。

下面是代码,但似乎没有运行:

<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) {
e.preventDefault();
var frm = $("#myForm");
var dat = frm.serialize();
$.ajax({
type: 'POST',
url: $('#myForm').attr('action'),
data: dat,
contentType: 'application/json'
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="name" value="myName">
<input type="submit" value="Submit">
</form>

在 Tomcat 中我得到以下错误:

org.springframework.web.servlet.mvc.support.DefaultHandlerE xceptionResolver handleNoSuchRequestHandlingMethod WARNING: No matching handler method found for servlet request: path '/application/save', method 'POST', parameters map['name' -> array['myName']]

有什么地方出错了吗?我是 JSON 的新手。我正在尝试将 JSON 发送到 Spring MVC Controller 。

@Controller
@RequestMapping("/run/*")
public class HistoryController {

@RequestMapping(value = "save", method = RequestMethod.POST, headers = {"content-type=application/json"})
public @ResponseBody Response save(@RequestBody User user) throws Exception {
Response userResponse = new Response();
System.out.println("UserId :" + " " + user.getName());
return userResponse;
}
}

@RequestMapping(value = "find", method = RequestMethod.GET)
public @ResponseBody Response find() {
System.out.println("Run");
Response userResponse = new Response();
userResponse.setVersionNumber("1.0");
return userResponse;
}

当调用/application/run/save 时,我得到一个 JSON 响应。但是@RequestBody 不起作用。


我仍然没有运气。已经阅读了很多类似的问题。要求是服务器只接受 application/json 类型。我正在使用 Spring MVC Controller 。如前所述,代码通过@ResponseBody 将响应作为 JSON 发回。我想通过我的 Spring MVC Controller 中的@RequestBody 获取信息。我正在使用 JSP 将 JSON 发送到 Spring MVC Controller 。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>

运行时我没有得到任何输出。在 Chrome 中出现 404 Not found 错误,在 Tomcat 中出现以下错误:

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?

网络.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>-->
</beans>

Controller

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;
}
}

当调用/application/delete 时,我得到返回的 JSON。所以我知道我的 JacksonProcessor 配置正确。问题出在@RequestBody。

我哪里错了?请帮助我。

最佳答案

这个问题有点难理解,因为似乎有几个不同的问题。

但是只看这个问题:

In Tomcat I get the following error:

org.springframework.web.servlet.mvc.support.DefaultHandlerE xceptionResolver handleNoSuchRequestHandlingMethod WARNING: No matching handler method found for servlet request: path '/application/run', method 'POST', parameters map['name' -> array['myName']]

在您发布的 HTML 中,您有一个 <form>设置为 POST/application/run .

但是,在您的 @Controller类,您没有任何方法绑定(bind)到此 URL。

因为您已经用 @RequestMapping("/run/*") 注释了类并且该方法用 @RequestMapping("save") 注释, save()方法实际上绑定(bind)到 URL /run/save - 这既不是您使用 $.ajax() 向其发送数据的 URL也不是表单指向的 URL。

我建议打开 org.springframework.web 上的日志记录记录器到 DEBUG - 当您的应用程序启动时,Spring 将记录每个方法映射到的每个 URL。

关于java - 将 JSON 发送到 Spring MVC Controller ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12464586/

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