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| 在web.xml中设置参数的范围 |
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// web.xml
/*
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
<context-param>
<param-name>name</param-name>
<param-value>Joe</param-value>
</context-param>
<context-param>
<param-name>password</param-name>
<param-value>password</param-value>
</context-param>
<servlet>
<servlet-name>ParameterServlet</servlet-name>
<servlet-class>ParameterServlet</servlet-class>
<init-param>
<param-name>name</param-name>
<param-value>Joe</param-value>
</init-param>
<init-param>
<param-name>password</param-name>
<param-value>password</param-value>
</init-param>
</servlet>
</web-app>
*/
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ParameterServlet extends HttpServlet {
private String dbName = "";
private String dbPassword = "";
public void init(ServletConfig config) throws ServletException {
super.init(config);
ServletContext context = getServletContext();
dbName = context.getInitParameter("name");
dbPassword = context.getInitParameter("password");
}
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException {
ServletOutputStream out = res.getOutputStream();
res.setContentType("text/html");
out.println("<html><head><title>Basic Servlet</title></head>");
out.println("<body>Database username is <b>" + dbName);
out.println("</b><br>Database password is <b>" + dbPassword + "</b>");
out.println("</body></html>");
}
}
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