1. 新建TestServlet類
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package com.yanek.test;import java.io.IOException;import java.lang.reflect.Method;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 獲取類的全路徑以及名稱 String className = request.getParameter("className"); // 獲取方法名 String methodName = request.getParameter("method"); try { // 獲取class文件 Class<?> t_class = Class.forName(className); // 獲取該類所需求的方法 Method method = t_class.getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class); method.invoke(t_class.newInstance(), request, response);// 方法的實(shí)現(xiàn) } catch (Exception e) { e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }} |
2. 建立需要自動(dòng)調(diào)用的類
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package com.yanek.test;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Test { /** * @param args */ public static void main(String[] args) { System.out.println("hello world !"); } public void test(HttpServletRequest request, HttpServletResponse response) { System.out.println("hello"); System.out.println(request.getParameter("username")); }} |
3. web.xml配置
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<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <description>Test</description> <display-name>Test</display-name> <servlet-name>Test</servlet-name> <servlet-class>com.yanek.test.TestServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Test</servlet-name> <url-pattern>/Test</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <login-config> <auth-method>BASIC</auth-method> </login-config></web-app> |
4. 啟動(dòng)服務(wù)器訪問:
http://127.0.0.1:8081/TestPrj/Test?className=com.yanek.test.Test&method=test&username=aspboy
控制臺(tái)輸出:
hello
aspboy
說明: 類com.yanek.test.Test類的 方法 public void test(HttpServletRequest request, HttpServletResponse response) 被執(zhí)行了.
反射機(jī)制是java中的重要功能,在框架設(shè)計(jì)中大量使用.
測試環(huán)境: tomcat6.0
以上這篇利用java反射機(jī)制實(shí)現(xiàn)自動(dòng)調(diào)用類的簡單方法就是小編分享給大家的全部內(nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持服務(wù)器之家。
