The action path problem in form form, form form action path "JSP--->servlet Road" this and the previous "JSP--->servlet" article about

Action path problem in form form, form form action path

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Action path problem in form form, form form action path
Just touch the web today, when using JSP and servlet to do a simple landing in the form form the Action property and the method attribute some problems;


I encountered an issue with the form form submission to Servelet processing:
(1) <form name= "Login" action= "①? "Method=" ②? ">

Form content

Username:<input type = "text" name = "username" > <br>
Password:<input type = "password" name = "pwd" > <br>
<input type = "Submit" >
</form>

(2) The corresponding servlet class for processing user requests is Helloservlet.java;


(3) Configure the Web. xml file:
<servlet>
<servlet-name>③servlet</servlet-name>
<servlet-class>/HelloServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>③servlet</servlet-name>
<url-pattern>/①welcome</url-pattern>
</servlet-mapping>

Then in the login.jsp it should be:

<form action= "①welcome" method= "②? ">

In this case, the login.jsp URL is http://localhost:8080/jsp/login.jsp

And the URL of Helloservlet.java is Http://localhost:8080/jsp/welcome

Values can be taken in HelloServlet

String name = "";
String pwd = "";
Name = Req.getparameter ("username");
PWD = Req.getparameter ("pwd");

Note: The ③ corresponds to the two servlet-name in Web. XML, and the Url-pattern in ① is consistent with the Action property value in the form form; The ③method method defaults to the Get method, but this method exposes the value to the browser. So the general use of the Post method, hidden value content;

For the form form action path problem in Java

Path configuration for general action you should add a namespace to the package in Struts.xml.
Then let the namespace value match the name of the JSP folder.
So when you write the action path of the form, you can write the relative path directly. For example
<form method= "POST" action= "Add_emp.action" >
and see the landlord action request has _ should be in the Struts.xml action with a wildcard bar
<action name= "add_*" class= "slightly" method= "{1}" > This is the usual usage of the configuration
Hope the landlord can use the happy

How to get the file path of form form file type in action

<form action= "" method= "POST" >
<input type= "File" name= "File1"/>
</form>
Request.getparameter ("File1");

<form action= "" method= "Post" enctype= "Multipart/form-data" >
<input type= "File" name= "File1"/>
</form>
ServletInputStream sis = Request.getinputstream ();
With SIS read, one line of analysis.

The action path problem in form form, form form action path "JSP--->servlet Road" this and the previous "JSP--->servlet" article about