问题：

发送JSON到Spring MVC控制器

梅庆

2023-03-14

我试图将JSON发送到Spring MVC控制器。在Spring MVC方面，所有的配置都是正确的。

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>

你知道我哪里出错了吗？我对JSON是新手。我试图将JSON发送到Spring MVC控制器。

@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，我会得到一个JSON响应。但是，@RequestBody不能工作。

我还是没有运气。读过一些很多类似的问题。需求是服务器将只接受Application/JSON类型。我使用的是一个Spring MVC控制器。如前所述，代码通过@ResponseBody将响应作为JSON发送回来。我想通过Spring MVC控制器中的@RequestBody获得信息。我正在使用JSP将JSON发送到Spring MVC控制器。下面可以看到我的代码和Spring MVC：

我对JSON和JavaScript是新手。

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>

当运行这个时，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部分有什么问题吗？

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>

<?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>

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;
}
}

尉迟越

2023-03-14

这个问题有点难理解，因为似乎有几个不同的问题。

但是看看这个问题：

在Tomcat中，我得到以下错误：

defaultHandlere xceptionResolver handleNoSuchRequestHandlingMethod警告：没有为servlet请求找到匹配的处理程序方法：路径'/application/run'，方法'post'，参数映射['name'->array['my name']]

在发布的HTML中，有一个

，它被设置为 postto /application/run。

但是，在@controller类中，没有绑定到此URL的任何方法。

因为您已经用@requestmapping（“/run/*”）注释了该类，并且用@requestmapping（“save”）注释了该方法，所以save()方法实际上绑定到URL/run/save-这既不是您用$.ajax()发送数据的URL，也不是表单指向的URL。

我建议在org.springframework.web记录器中将日志显示为debug-当应用程序启动时，Spring将记录每个方法映射到的每个URL。

发送JSON到Spring MVC控制器

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