"Javaweb" Learning note five JSP built-in objects (top)

1. Common JSP built-in objects

2.out objects

An Out object is an instance of the JspWriter class and is an object commonly used to output content to the client

Number	Method	Description
1	void Clear ()	Clears the contents of the buffer
2	void Clearbuffer ()	Clears the current contents of the buffer
3	void Flush ()	Emptying the stream
4	int GetBufferSize ()	Returns the size of the buffer as a number of bytes, or 0 if no buffer is set
5	int getremaining ()	Returns how much of the buffer is remaining available
6	Boolean Isautoflush ()	Automatically empties or throws an exception when the buffer full is returned
7	void Close ()	Turn off the output stream
8	void println ()	To print a string to the client

The difference between 3.get&post methods

4.request objects

The client's request information is encapsulated in the requests object

It is the ability to understand the needs of the customer and then respond. It is an instance of the HttpServletRequest class.

Number	Method	Description
1	Object GetAttribute (String name)	Returns the property value of the specified property
2	Enumeration Getattributenames ()	Returns an enumeration of all available property names
3	String getcharacterencoding ()	Returns the character encoding method
4	int Getcontentlength ()	Returns the length (in bytes) of the request body
5	String getContentType ()	Get the MIME type of the request body
6	ServletInputStream getInputStream ()	Gets the binary stream of a row in the request body
7	String GetParameter (string name)	Returns the parameter value of the parameter specified by name
8	Enumeration Getparameternames ()	Returns an enumeration of the available parameter names
9	String[] Getparametervalues (String name)	Returns an array that contains all the values of the parameter name
10	String Getprotocol ()	Returns the protocol type and version number of the request
11	String Getscheme ()	Returns the name of the plan used for the request, such as HTTP HTTPS and FTP
12	int Getserverport ()	Returns the port number used by the server to accept this request
13	String getServerName ()	Returns the host name of the server that accepted the request
14	BufferedReader Getreader ()	Returns the requested body that has been decoded
15	String getremoteaddr ()	Returns the IP address of the client sending this request
16	String Getremotehost ()	Returns the host name of the client that sent this request
17	void SetAttribute (String key Object obj)	Setting property values for a property
18	String Getrealpath (String path)	Returns the true path of a virtual path
19	void Setcharacterencoding ("gb2312")	Set the character set that accepts parameters

"Javaweb" Learning note five JSP built-in objects (top)