package com.test.classobject;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.test.pojo.Student;
/**
* Servlet implementation class TestServlet2
*/
@WebServlet("/TestServlet2")
public class TestServlet2 extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public TestServlet2() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//反射用法1
try {
Class clazz1=Class.forName("com.test.pojo.Student");
//根据参数列表获得指定的构造函数
Constructor constructor= clazz1.getDeclaredConstructor(String.class,int.class);
//根据构造函数创建对象
Student student=(Student) constructor.newInstance("zhangsan",23);
response.getWriter().println(student.getSname());
//获得所有的构造函数
Constructor[] arr= clazz1.getDeclaredConstructors();
for(Constructor constructor2 : arr)
{
//获得构造函数的参数类型
Class[] brr= constructor2.getParameterTypes();
for(Class clazz2:brr)
response.getWriter().print(clazz2.getName()+",");
response.getWriter().println();
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
javaee 反射应用之一,指定构造函数创建对象
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转载自blog.csdn.net/Rockandrollman/article/details/131737157
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