利用java反射机制实现自动调用类的简单方法

1. 新建TestServlet类

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 {
 // 获取类的全路径以及名称
 String className = request.getParameter("className");
 // 获取方法名
 String methodName = request.getParameter("method");
 try {
  // 获取class文件
  Class t_class = Class.forName(className);
  // 获取该类所需求的方法
  Method method = t_class.getDeclaredMethod(methodName,
   HttpServletRequest.class, HttpServletResponse.class);
  method.invoke(t_class.newInstance(), request, response);// 方法的实现
 } catch (Exception e) {
  e.printStackTrace();
 }
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 doGet(request, response);
 }

}

2. 建立需要自动调用的类

package com.yanek.test;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Test {

 
 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

 
 Test
 Test
 Test
 com.yanek.test.TestServlet
 1
 
 
 Test
 /Test
 
 
 index.jsp
 
 
 BASIC
 

4. 启动服务器访问:

http://127.0.0.1:8081/TestPrj/Test?className=com.yanek.test.Test&method=test&username=aspboy

控制台输出:

hello

aspboy

说明: 类com.yanek.test.Test类的 方法 public void test(HttpServletRequest request, HttpServletResponse response) 被执行了.

反射机制是java中的重要功能,在框架设计中大量使用.

测试环境: tomcat6.0

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