Request. getattribute (): the value of the variable set during request. Use request. setattribute ("name", "your own value"); To set the value,
Request. getparameter (): extract the sent parameters, for example, request. getparameter.
Is used to accept parameters from the get or POST method
<Form method = post>
<Form method = get>
<A href = "1.jsp? Id = 1 "> OK </a>
Only java. Lang. string can be accepted.
That is, string parameter _id = request. getparameter ("parameter _id ");
Request. getattribute
Is used to accept variables or actions from servlet (in fact, action is a special servlet)
In action, request. setattribute ("RET", RET );
Only java. Lang. object can be accepted.
That is, list ret = (list) request. getattribute ("RET ");
If you only use JSP, request is not used at all. getattribute () request. getattribute () and request. the difference between getparameter () is request. getattribute () obtains the object type, while request. getparameter () obtains the string type.
