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第一步:找到它:
D:\apache-tomcat-9.0.11\conf
第二步:
在context加上它:
<Context>
<Environment name="mytest" value="hello world I am coming" type="java.lang.String"/>
</Context>
第三步写代码:
jsp文件
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.naming.InitialContext" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
try {
Context con = new InitialContext();
String test = (String) con.lookup("java:comp/env/mytest");
out.print(test);
} catch (Exception e) {
e.printStackTrace();
}
%>
</body>
</html>
然后成功。