@JSP-From
The From object represents an HTML form, and each time it appears in an HTML document, the from object is created
1.From object collection
elements [] (elements) an array containing all the elements in the form
2.From object properties
| Serial number | Attributes | effect |
|---|---|---|
| 01 | acceptCharset | Acceptable character set of the server |
| 02 | raft | Set or return the frame or window name of the form submission result |
| 03 | action | Set or return the form's action attribute |
| 04 | name | Set or return the name of the form |
| 05 | id | Set or return the form id |
| 06 | method | Set or return the HTTP method to send data to the server |
| 07 | length | Returns the number of elements in the form |
| 08 | entype | Sets or returns the MIME type that the form uses to encode content |
| 09 | method | Form data will be attached to the URL through the method attribute (post and GET two transmission methods) |
### 3. Standard properties
| Serial number | Attributes | method |
|---|---|---|
| 01 | className | Set or return the element's class attribute |
| 02 | to you | Set or return the text direction |
| 03 | lang | Sets or returns the language code of an element |
| 04 | title | Sets or returns the element's title attribute |
@JSP-Input
### 1. Attribute value
input type = "attribute value" represents an input object from the From form
| Serial number | value | effect |
|---|---|---|
| 01 | button | Define clickable buttons |
| 02 | checkbox | Checkbox |
| 03 | file | Define input fields and "Browse" button for file upload |
| 04 | hidden | Define hidden input fields |
| 05 | image | Define the submit button in the form of an image |
| 06 | password | Define the password field, the characters in this field are masked |
| 07 | radio | Define radio buttons |
| 08 | reset | Define reset button |
| 09 | submit | Define the submit button. Submit button will send the form data to the server |
| 10 | text | Define a single-line input field, the user can enter text in it, the default width is 20 characters |
@JSP-request
Overview: request for data received html form submission
features:
- Encapsulate HTTP request parameter information
- Perform attribute value transfer
- Complete server jump
method
| Serial number | method | effect |
|---|---|---|
| 01 | getAttribute(String name) | Get the value specified by name, or return null if the specified attribute does not exist |
| 02 | setAttribute(String name,java.lang.Object obj) | Set the value of the request parameter of the name name to obj |
| 03 | getParameter(String name) | Get the parameter value passed from the client to the server |
| 04 | getQueryString () | Obtain the query string, which is transmitted to the server by the client GET method |
| 05 | getCookie() | Returns the client's cookie object, the result is a cookie array |
| 06 | getHeader(String name) | Or transfer the header information defined by the HTTP protocol |
| 07 | getHeaderName() | Return the names of all request headers and save the result in an instance of Enumeration class |
| 08 | getServerName(String name) | Get the name of the server |
| 09 | getServerPort(String name) | Get the server's port number |
| 10 | getRemoteAddr() | Obtain the client's IP address |
| 11 | getRemoteHost() | Get the client's computer name |
| 12 | getProtocol() | Obtain the protocol name for the client to transmit data to the server |
| 13 | getMethod() | Method for obtaining data transmitted from client to server |
| 14 | getServlePath () | Obtain the file path of the script file for the client lock Qingqiu |
| 15 | getCharacterEncoding() | Get the character encoding in the request |
| 16 | getSession(Boolean breate) | Return the session related to the request |
| 17 | getParameterNames() | Get all the parameters worth the name |
| 18 | getParameterValues() | Get the specified parameter value |
| 19 | getRequestURI() | Get the client address that sent the request string |
| 20 | getContentLength() | Get the length of the content |
