1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
| package com.xiaoguan.learn;
import jakarta.servlet.GenericServlet;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Objects;
public class ServletContext extends GenericServlet {
@Override
public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out=res.getWriter();
jakarta.servlet.ServletContext application=this.getServletContext();
Enumeration<String> strs=application.getInitParameterNames();
while (strs.hasMoreElements()){
String name= strs.nextElement();
String value=application.getInitParameter(name);
out.print(name+","+value+"<br>");
}
String contextPath= application.getContextPath();
out.print(contextPath+"<br>");
String realPath = application.getRealPath("/index.html");
out.print(realPath+"<br>");
application.log("大家好！");
int age=17;
if(age<18){
application.log("错误",new RuntimeException("go!"));
}
application.setAttribute("test0",12345);
application.removeAttribute("test0");
int test0 = (int) application.getAttribute("test0");
out.print(test0);
}
}
|