javaee 反射应用之一，获得对象的字段信息-Toy模板网

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package com.test.classobject;

import java.io.IOException;
import java.lang.reflect.Field;

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 AddStudentServlet
 */
@WebServlet("/AddStudentServlet")
public class AddStudentServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public AddStudentServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
				//response.getWriter().append("Served at: ").append(request.getContextPath());
			    Class clazz=Student.class;
			    
			    Field[] arr= clazz.getDeclaredFields();
			    
			    Student student=new Student();
			    
			    //遍历student对象中的所有的字段
			    for(Field field:arr)
			    {
			    	String name= field.getName();//获得当前字段的名称  依次获得sid sname age 
			    	String value=request.getParameter(name);//根据字段名称获取表单中对应元素的值
			    	
			    	//response.getWriter().println(field.getGenericType().toString());
			    	
			    	try {
			    		field.setAccessible(true);//设置当前字段可以访问	    		
			    		//将值存入student对象中对应的字段
			    		if(field.getGenericType().toString().equals("int"))
			    		    field.set(student, Integer.parseInt(value));
			    		else if(field.getGenericType().toString().equals("class java.lang.String"))
			    			field.set(student, value);
			    		
					} catch (IllegalArgumentException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IllegalAccessException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
			    }
			    
			    response.getWriter().println(student.getSid()+","+student.getSname()+","+student.getAge());
	}

	/**
	 * @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);
	}

}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="AddStudentServlet" method="post">
<Pre>
   学号:<input type='text' name='sid' />
   学生名称:<input type='text' name='sname' />
  年龄:<input type='text' name='age' />
  <input type='submit' name='sub' value='添加' />
</Pre>
</form>
</body>
</html>