007_ServletConfig

1. ServletConfig: 可以获取servlet的一些配置信息。

2. 新建一个UseServletConfig的Web工程

3. 在WebContent下新建一个index.html

4. 编写index.html

<!DOCTYPE html>
<html><head><meta charset="UTF-8" /><title>Use Servlet Config</title></head><body><h1>Use Servlet Config</h1></body>
</html>

5. 新建一个UseServletConfig.java

6. 编写UseServletConfig.java

package com.lywgames.myservlet;import java.io.IOException;
import java.util.Enumeration;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UseServletConfig extends HttpServlet {private static final long serialVersionUID = 1L;@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// ServletConfig: 可以获取servlet的一些配置信息。//1. 得到servlet配置对象, 专门用于获取配置在servlet的信息ServletConfig servletConfig = getServletConfig();//2. 获取到的是配置servlet里面servlet-name的文本内容String servletName = servletConfig.getServletName();System.out.println("servletName = " + servletName);//3. 可以获取具体的某一个参数。String address = servletConfig.getInitParameter("address");System.out.println("address = " + address);//4. 获取所有的参数名称Enumeration<String> names = servletConfig.getInitParameterNames();//5. 遍历取出所有的参数名称while (names.hasMoreElements()) {String key = (String) names.nextElement();String value = servletConfig.getInitParameter(key);System.out.println("key = " + key + ", value = "+value);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}
}

7. 在web.xml里配置servlet, 并且配置一些初始化信息

8. 在浏览器地址栏中输入:

http://localhost:8080/UseServletConfig/USC.action访问一下

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