Common Methods in ServletContext

1. Obtain the initialization parameters of Tomcat Context.
1. Obtain the initialization parameters of Context in Tomcat server. xml.
For example:

Copy codeThe Code is as follows: <Context path = "/testcontext" docBase = "/context"
Privileged = "true" antiResourceLocking = "false" antiJARLocking = "false"
Debug = "0" reloadable = "true">
<Parameter name = "name" value = "yangqisheng"/>
</Context>

Method: getServletContext (). getInitParameter (String name)
2. Obtain the initialization parameters for setting Context in the web. xml file of the project.
For example:Copy codeThe Code is as follows: <context-param>
<Param-name> age </param-name>
<Param-value> 24 </param-value>
</Context-param>

Method: getServletContext (). getInitParameter (String name)

Ii. Record Tomcat logs
1. Set the log file
In the server. xml file, use the logger element to set the log file.

Copy codeThe Code is as follows: <Logger className = "org. apache. catalina. logger. FileLogger"
Prefix = "localhost_log." suffix = ". txt" timestamp = "true"/>

Write log: this. getServletContext (). log ("test ")

3. Access resource files
3.1 getResource (String parh) method: path must start with/, representing the root directory of the current web application. Returns a URL object that represents a resource.
3.2 getResoutceAsStream (String parh) returns the file stream. This advantage is that you can access all files in the web directory using the path relative to the root directory without having to know the absolute path.
For example, creating a file me. properties in a WEB-INF with the content:
Name = yangqisheng
Age = 25

Copy codeThe Code is as follows: this. getServletContext (). getResourceAsStream ("/WEB-INF/me. properties ");
Properties me = new Properties ();
Me. load (is );
Out. write (me. getProperty ("name "));
Out. write (me. getProperty ("age "));

Then execute:
Yangqisheng25 will be printed