利用java反射机制实现自动调用类的简单方法
1.新建TestServlet类
packagecom.yanek.test;
importjava.io.IOException;
importjava.lang.reflect.Method;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassTestServletextendsHttpServlet{
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
//获取类的全路径以及名称
StringclassName=request.getParameter("className");
//获取方法名
StringmethodName=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
Methodmethod=t_class.getDeclaredMethod(methodName,
HttpServletRequest.class,HttpServletResponse.class);
method.invoke(t_class.newInstance(),request,response);//方法的实现
}catch(Exceptione){
e.printStackTrace();
}
}
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
doGet(request,response);
}
}
2.建立需要自动调用的类
packagecom.yanek.test;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassTest{
/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
System.out.println("helloworld!");
}
publicvoidtest(HttpServletRequestrequest,HttpServletResponseresponse){
System.out.println("hello");
System.out.println(request.getParameter("username"));
}
}
3.web.xml配置
<?xmlversion="1.0"encoding="UTF-8"?> <web-appversion="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/javaeehttp://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.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publicvoidtest(HttpServletRequestrequest,HttpServletResponseresponse)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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