问题描述

如果一个struts 2动作类有一个属性

If a struts 2 action class have a property of

列表<用户>用户列表.

并且用户类具有类似的属性

And the user class has properties like

用户名、密码、创建日期等

是否可以通过传递适当的 JSON 字符串来使 struts 填充列表，同时提交指向该操作的 jQuery ajax 请求.

Is it possible to make struts populate the list by passing the appropriate JSON string, while submitting a jQuery ajax request pointed at that action.

如果有可能怎么办?特别是 JSON 字符串的外观如何?

If it is possible how? Specially how will the JSON string have to look like?

请询问任何澄清.

如果我不够清楚，我很抱歉.我想要做的不是从 Action 获取数据到 JSP，或者提交表单来填充数据.我想提交一个带有 JSON 数据的 AJAX 请求，Struts 2 可以使用它来自动填充 Action 类中的 List.

EDIT : I'm sorry if I wasn't clear enough. What I want to do is not get data from Action to a JSP, or submit a form to populate the data. I want to submit a AJAX request with JSON data which Struts 2 can use to automatically populate the List in the Action class.

不使用 AJAX 提交表单.

Not submit the form with AJAX.

推荐答案

1. 您应该定义您的操作结果 type="json" 并检查您的类路径中是否有 json 插件，确保您有

1. you should define your action result type="json" and check you have json plugin on your classpath, make sure you have

<struts>
    <package name="your_package" extends="struts-default, json default" namespace="/">
    // your action here
    </pacakge>
    ...
</struts>

public class myAction extends ActionSupport {
    private List<User> userlist; // getter and setter
    public String execute() {
       // your moves
       return SUCCESS;
    }
}

<s:iterator list="userList">
  <s:property value="username"/>
  <s:property value="password"/>
  <s:property value="createdDate"/>
<s:iterator>

希望对你有帮助..

更新

如果你已经有一个 json 对象:

if you have already a json object:

{
   "userList" : [
      {"username" : "username", "password" : "afgasdfa", "createdDate" : "date-in-format"},
      {"username" : "username", "password" : "afgasdfa", "createdDate" : "date-in-format"},
      {"username" : "username", "password" : "afgasdfa", "createdDate" : "date-in-format"},
      {"username" : "username", "password" : "afgasdfa", "createdDate" : "date-in-format"}
   ]
}

这应该是格式.

那么你应该使用 List<User> 从你的动作类中获取这个对象.用户列表

只是尝试并反馈.

更新 2

也许您应该使用 String 获取您的 json 对象，然后使用以下方法将其转换为 Java 对象:

maybe you should get your json object using String, then convert it to Java Object using:

String stringObject; // which get your string from http
List<User> userList;

userList = (List<User>)JSON.deserialize(stringObject,List<User>.class);

请再次反馈.