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Ajax asynchronous request method for JSON in SpringMVC environment

php中世界最好的语言Original: 2018-04-04 16:02:061549browse

This time I will bring you the method of Ajax asynchronous requesting JSON in the SpringMVC environment. What are the precautions for Ajax asynchronously requesting JSON in the SpringMVC environment. The following is a practical case, let's take a look.

First environment construction

The first is the conventional spring mvc environment construction. Needless to say, it needs to be noted that jackson related needs to be introduced here. jar package, and then add json parsing related configuration in the spring configuration file "springmvc-servlet.xml". My complete code here is as follows:

<?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:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 避免IE执行AJAX时,返回JSON出现下载文件 -->
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
<property name="objectMapper">
<bean class="org.codehaus.jackson.map.ObjectMapper">
<property name="dateFormat">
<bean class="java.text.SimpleDateFormat">
<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss"></constructor-arg>
</bean>
</property>
</bean>
</property>
</bean>
<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 -->
</list>
</property>
</bean>
<mvc:annotation-driven
content-negotiation-manager="contentNegotiationManager" />
<bean id="contentNegotiationManager"
class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<!-- true，开启扩展名支持，false关闭支持 -->
<property name="favorPathExtension" value="false" />
<!-- 用于开启 /userinfo/123?format=json的支持 -->
<property name="favorParameter" value="true" />
<!-- 设置为true以忽略对Accept Header的支持 -->
<property name="ignoreAcceptHeader" value="false" />
<property name="mediaTypes">
<value>
atom=application/atom+xml
html=text/html
json=application/json
xml=application/xml
*=*/*
</value>
</property>
</bean>
<context:annotation-config />
<!-- 启动自动扫描该包下所有的Bean(例如@Controller) -->
<context:component-scan base-package="cn.zifangsky.controller" />
<mvc:default-servlet-handler />
<!-- 定义视图解析器 -->
<bean id="jspViewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="requestContextAttribute" value="rc" />
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
<property name="order" value="1"></property>
</bean>
</beans>

Project structure:

Note: The complete jar package I used for testing here: http://pan.baidu.com/s/1dEUwdmL

Two test examples

(1) Create a new index.jsp file in the WEB-INF/jsp directory, which contains a simple jQuery ajax request. The format of the request data is JSON, the specific code is as follows:

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<base href="<%=basePath%>">
<script type="text/javascript" src="scripts/jquery/jquery-1.6.2.min.js"></script>
<script type="text/javascript" src="scripts/jquery/jquery.i18n.properties-min-1.0.9.js"></script>
<script type="text/javascript" src="scripts/jquery/jquery.autocomplete.js"></script>
<script type="text/javascript" src="scripts/jquery/jquery.loadmask.js"></script>
<script type="text/javascript" src="scripts/jquery/jquery.form.js"></script>
<script type="text/javascript" src="scripts/jquery/jquery.timers.js"></script>
<title>jQuery i18n</title>
<script type="text/javascript">
$().ready(
function() {
$("#sub").click(
function() {
var name = $("#username").val();
var age = 18;
var user = {"username":name,"age":age};
$.ajax({
url : 'hello.json',
type : 'POST',
data : JSON.stringify(user), // Request body 
contentType : 'application/json; charset=utf-8',
dataType : 'json',
success : function(response) {
//请求成功
alert("你好" + response.username + "[" + response.age + "]，当前时间是：" + response.time + "，欢迎访问：http://www.zifangsky.cn");
},
error : function(msg) {
alert(msg);
}
});
});
});
</script>
</head>
<body>
<input type="text" id="username"
style="width: 100px; height: 30px; font-size: 20px; font-weight: bold;">
<input type="button" id="sub" value="Go"
style="height: 40px; height: 30px;">
<br>
</body>
</html>

(2) A simple model class User, the code is as follows:

package cn.zifangsky.controller;
public class User {
private String username;
private int age;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}

(3) Controller class TestController.java:

package cn.zifangsky.controller;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
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.servlet.ModelAndView;
@Controller
@Scope("prototype")
public class TestController {
/**
* 转到页面
*/
@RequestMapping(value = "/hello.html")
public ModelAndView list() {
ModelAndView view = new ModelAndView("index");
return view;
}
/**
* ajax异步请求， 请求格式是json
*/
@RequestMapping(value = "/hello.json", method = { RequestMethod.POST })
@ResponseBody
public Map<String, String> hello(@RequestBody User user) {
// 返回数据的Map集合
Map<String, String> result = new HashMap<String, String>();
Format format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// 返回请求的username
result.put("username", user.getUsername());
// 返回年龄
result.put("age", String.valueOf(user.getAge()));
// 返回当前时间
result.put("time", format.format(new Date()));
return result;
}
}

About Let me briefly explain the specific execution steps:

i) After the project is started, visit: http://localhost:8089/SpringDemo/hello.html in the browser, and then go to the list in the execution controller method, and then go to /WEB-INF/jsp/index.jsp (PS: What is returned in the controller is the logical view, which is spliced with the path prefix and suffix defined in the springmvc-servlet.xml file to synthesize the real file. Path)

ii) Enter text on the index.jsp page and click the button, which will trigger an ajax request. This request will obtain the data in the input box and the default "age" parameter and splice it into a json format string. Submit the request to "hello.json", that is, execute the hello method in the controller

iii) After the hello method is executed, a series of data will be returned and finally displayed on the page

(4 ) The effect is as follows:

# I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Ajax asynchronous request method for JSON in SpringMVC environment

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