我想从 spring Controller 返回 json 对象列表并在 View 中使用它，但它返回空列表! 我不明白这个问题。 我在 分钟 Controller 中创建 Activity 对象并将其作为 json 返回。但我无法使用 jquery 获取它的形式。 但当我尝试 localhost:8080/FitnessTracker5/activities.json 时，我可以在浏览器中看到正确的结果。 我的服务器是 glassfish
addMinutes.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<html>
<head>
<title>Add Minutes Page</title>
<script type="text/javascript" src="/WEB-INF/pages/jquery-3.1.0.js"></script>
<script type="text/javascript">
$(document).ready(
function(){
$.getJSON('localhost:8080/FitnessTracker5/activities.json' , {
ajax:'true'
}
,
function(data){
var html = '<option value="">please select one--</option>'
var len = data.length;
for(var i=0 ; i<len ;i++){
html += '<option value="' + data[i].desc + '">'
+data[i].desc+ '</option>' ;
}
html +='</option>';
$('#activities').html(html);
});
});
</script>
</head>
<body>
<h1>Add Minutes Excersisedddd:</h1>
Language:<a href="?language=en">English</a> | <a href="?language=fa">Persian</a>
<form:form commandName="exercise">
<table>
<tr>
<td><h1><spring:message code="goal.text"/> </h1> </td>
<td> <form:input path="minutes"/></td>
<td>
<form:select id="activities" path="activity"></form:select>
</td>
</tr>
</table>
</form:form>
</body>
</html>
Activity .java
public class Activity {
private String desc ;
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
}
MinutesController.java @ Controller
public class MinutesController {
@RequestMapping(value = "/addMinutes")
public String addMinutes(@ModelAttribute("exercise") Exercise exercise){
System.out.println("exercise" + exercise.getMinutes());
System.out.println("exerciseeeee" + exercise.getActivity());
return "addMinutes" ;
}
@RequestMapping(value = "/activities" , method = RequestMethod.GET)
public @ResponseBody List<Activity> findAllActivities(){
System.out.print("ACCCCCCCCCCCCCCCCCCCCc");
List<Activity> activities = new ArrayList<Activity>();
Activity run = new Activity();
run.setDesc("Run");
activities.add(run) ;
Activity bike = new Activity();
bike .setDesc("Bike");
activities.add(bike) ;
Activity swim = new Activity();
swim.setDesc("Swim");
activities.add(swim) ;
return activities;
}
@RequestMapping(method=RequestMethod.GET, value ="/test")
public @ResponseBody Activity getMovie( ){
Activity activity = new Activity();
activity.setDesc("aaaaa");
return activity;
}
}
最佳答案
从上面的评论看来，问题是无法加载 JQuery，这可能是由于调度程序 servlet 配置错误造成的。您可以尝试从 CDN 访问 jquery:
<script type="text/javascript" src="//code.jquery.com/jquery-3.1.0.min.js"></script>
如果您想从应用程序中提供 jquery，您应该在 google 中搜索“提供 Spring MVC 静态资源”:)
并将http://添加到url。
$.getJSON('http://localhost:8080/FitnessTracker5/activities.json' , {
关于java - 从 spring mvc Controller 返回 json 对象列表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39071986/