El expression in JSP gets data _java

JSP Tags:

<jsp:include>
<jsp:forward> Implementation Request Forwarding
<jsp:param> to add parameters to the above

El expression:

1. Get Variable data

<%
String name= "Taoshan";
Pagecontext.setattribute ("name", name);
%>

Hello, ${name}

2. Get Array data

<%
string[] names={"Taoshan", "John"};
Pagecontext.setattribute ("names", names);
%>

Hello, ${names[0]}

3. Get Collection data

<%
list<string> names=new arraylist<string> ();
Names.add ("Taoshan");
Names.add ("John");
Pagecontext.setattribute ("names", names);
%>

Hello, ${names[1]}

<%
map<string,string> names=new hashmap<string,string> ();
Names.put ("name", "Taoshan");
Pagecontext.setattribute ("names", names);
%>

Hello, ${names[' name ']} ${names.name}

4. Get JavaBean Data

Note to guide the package, the expression automatically adjust Get method

<% person
person=new person ();
Person.setname ("Taoshihan");
Pagecontext.setattribute ("person", person);
%>

Hello, ${person.name}

Path: ${pagecontext.request.contextpath} = = <%=request.getcontextpath ()%>