Form for receiving arrays in struts and Ajax

We are too familiar with the form passing value in struts2. It is very easy to pass one or more values or attributes of an object.

But we wantUpload an array and expect struts to receive it correctlyWhat should I do?

 

The following describes how to use common forms and Ajax. First, we have an entity, an action, and a JSP.

 

Student. Java

Public class student
{
Private string name;
Private string num;
}

Studentaction. Java

Public class studentaction extends actionsupport
{
Private list <student>Lststu;
}

XY. jsp

<SCRIPT type = "text/JavaScript">
VaR stus = [];
Stus. Push ({num: "1", name: "xy1 "});
Stus. Push ({num: "2", name: "xy2 "});
Stus. Push ({num: "3", name: "xy3 "});
</SCRIPT>

 

The following code is written in the script area of xy. jsp.

 

Common form-traverse the array and construct a form hidden field

VaR htmlcontent = "";
For (VAR I = 0; I <stus. length; I ++ ){
Htmlcontent + = "<input type = 'den den 'name = 'lstu [" + I + "]. name 'value = '"+ stus [I]. name + "'/> ";
Htmlcontent + = "<input type = 'den den 'name = 'lstu [" + I + "]. num 'value = '"+ stus [I]. num + "'/> ";
}

Special Cases

<Input type = 'did' name = 'lstu. name' value = 'xy1'/>
<Input type = 'did' name = 'lstu. name' value = 'xy2'/>
<Input type = 'did' name = 'lstu. name' value = 'xy3'/>

Struts can recognize the attributes of leaflets, indicating three different student. However, uploading two attributes won't work because struts doesn't know the combination. Not recommended.

 

Ajax form -- traverse the array and construct a JSON object

VaR Param = {};
For (VAR I = 0; I <stus. length; I ++ ){
Param ["lststu [" + I + "]. Name"] = stus [I]. Name;
Param ["lststu [" + I + "]. Num"] = stus [I]. Num;
}

$. Ajax ({
Data: Param
});

In fact, we have constructed such a JSON object.

Data :{
Lststu [0]. Num: "1", lststu [0]. Name: "xy1 ",
Lststu [1]. Num: "2", lststu [1]. Name: "xy2 ",
Lststu [2]. Num: "3", lststu [0]. Name: "xy3"
}

Some people say that it is not convenient to directly upload the stus array as data to the action? The answer is that it cannot be passed in this way, so that the action cannot receive or struts does not know how to process the sent array.