servlet获取初始化配置信息

继承HttpServlet

package me.lisen.JavaEEStudy;
import com.sun.xml.internal.ws.api.WSService;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet(name = "HelloServlet")
public class HelloServlet extends HttpServlet {
public String initParam;
public void init(ServletConfig config) throws ServletException{
initParam = config.getInitParameter("website");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter printWriter= response.getWriter();
response.setCharacterEncoding("UTF-8");
printWriter.println(initParam);
printWriter.close();
}
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>me.lisen.JavaEEStudy.HelloServlet</servlet-class>
<init-param>
<param-name>website</param-name>
<param-value>www.lisen.me</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>
</web-app>

HttpServlet 还有一个不带参数的init()，当两个方法同时实现时，将调用带参数的方法。

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