JSON Jquery 到 Struts2 动作

2022-01-16 00:00:00 json jquery java struts2

我想将我的 JSON 对象从 Javscript 发送到 Struts2 Action.

I want to send my JSON object from Javscript to Struts2 Action.

示例 JSON 对象

  {
        "lists":["list1","list2","list3","list4","list5"],
        "maps": {  
            "key4":"value4","key3":"value3","key5":"value5","key2":"value2","key1":"value1"
        },
        "number1":123456789,
        "numberarray1":[1,2,3,4,5,6,7,8,9],
        "string1":"A",
        "stringarray1":["A1","B1"]
    }

我的 Jquery Ajax

My Jquery Ajax

$.ajax({
    type: 'POST', 
    url: 'json/JSON.action',
    data: JSON.stringify(data),
    dataType: 'json',
    async: false ,
    contentType: 'application/json; charset=utf-8',
    success: function(){window.alert('Done');}
});

Struts.xml 配置

Struts.xml config

<action name="JSON" class="com.actions.json.JsonAction" method="getJSON">
    <result type="json"/>
</action>

我的行动课

public class JsonAction extends ActionSupport {


    private String data;


    public String getJSON() {


        return ActionSupport.SUCCESS;
    }

    public String getData() {
        return data;
    }

    public void setData(String data) {
        this.data = data;
    }



}

我的问题是如何在动作类中接收 JSON 对象.

My Problem is how to receive the JSON Object in Action Class.

注意:POST OF JSON 对象是成功的.我只是不知道如何通过 Action Class 接收它.请帮助谢谢

NOTE: POST OF JSON object is successful.. I just don't know how to receive it via Action Class.. PLEASE HELP Thank you

推荐答案

  1. 您的 struts.xml 条目中有错字
  2. 您是否在 struts.xml 中定义了切片结果和拦截器.请查看此链接
  3. 您发送到服务器的 json，不包含任何 data 键.所以它将始终为空.由于 json 被表示为对象.您需要通过这种方式将 JSON 转换为 Java 对象.
  1. There is a typo in your struts.xml entry
  2. Have you defined tiles result and interceptor in struts.xml . Please see this link
  3. The json you are sending to the server, doesn't contain any data key. So it will be always null. Since json is denoted as objects. You need to convert JSON into Java objects in this way.

方法一.

为 lists,maps,number1,numberarray1,string1 等创建 setter.在这个链接的顶部，定义了这样做的方式.然后就可以通过这种方式访问​​所有的变量了.

Create setters for lists,maps,number1,numberarray1,string1 and so on. In the top of this link, is defined the way to do it. Then you can access all the variables in this way.

方法 2.在您的 javascript 中定义一个新对象.

Approach 2. In your javascript define a new object.

 var sentData ={};
 sentData ["sentData "] = data;
// And in your ajax call , 
data: JSON.stringify(sentData),

在你的 action 类中，为此创建 getter 和 setter.

And in your action class, create getters and setters for this.

Map<K.V> sentData = new HashMap<K,V>();

这将为您提供整个 json 对象作为地图.

This will give you whole json object as a Map.

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