Struts 2：使用JQuery ajax submit发送JSON字符串以映射到复杂类型列表

问题描述

如果struts 2动作类的属性为

List< User>用户列表。

用户类的属性类似于

用户名，密码，createdDate 等。

是否可以通过传递适当的JSON字符串使struts填充列表，同时提交指向该操作的jQuery ajax请求。 / p>

如果有可能如何？特别是JSON字符串将如何显示？

请询问任何说明。

编辑：我'对不起，如果我不够清楚的话。我想要做的不是从Action获取数据到JSP，或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。

不使用AJAX提交表单。

解决方案

1. 您应该定义您的行动结果 type =json并检查你的类路径上是否有json插件，确保你有

    < struts> 
   < package name =your_packageextends =struts-default，json defaultnamespace =/> 
    //您的行动
   < / pacakge> 
    ... 
   < / struts> 
     




2. 像这样编辑你的行动类

    公共类myAction扩展ActionSupport {
    private List< User>用户列表; // getter和setter 
    public String execute（）{
    //你的动作
   返回SUCCESS; 
   } 
   } 
     




3. 然后你可以在你的jsp上做点什么页面显示结果如：

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

我希望这可以帮助你..

更新

如果你已经有一个json对象：

  {
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。

然后你应该使用 List< User>来从你的动作类中获取这个对象。 userList

只需尝试并反馈。

UPDATE 2

也许您应该使用 String 获取您的json对象，然后使用以下命令将其转换为Java Object： / p>

  String stringObject; //从http 
获取你的字符串列表<用户>用户列表; 
 
 userList =（List< User>）JSON.deserialize（stringObject，List< User> .class）; 
  

请再次反馈。

If a struts 2 action class have a property of

List<User> userList.

And the user class has properties like

username, password, createdDate etc.

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.

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

Please ask any clarifications.

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.

Not submit the form with AJAX.

解决方案

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>
   

2. edit your action class like this

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

3. then you can do some on your jsp page to show the result like:

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

I hope this can help you..

UPDATE

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"}
   ]
}

this should be the format.

then you should get this object from your action class with List<User> userList

just try it and feedback.

UPDATE 2

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);

Please feedback again.

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