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)
doget(request, response);
}
2. 建立需要自动调用的类
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
<?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>
<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. 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