• 动态反射


    1.页面

     1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
     2 
     3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
     4 <html>
     5   <head>
     6     
     7     <title>利用反射的io-1</title>
     8     
     9     <meta http-equiv="pragma" content="no-cache">
    10     <meta http-equiv="cache-control" content="no-cache">
    11     <meta http-equiv="expires" content="0">    
    12     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    13     <meta http-equiv="description" content="This is my page">
    14     <!--
    15     <link rel="stylesheet" type="text/css" href="styles.css">
    16     -->
    17     <script type="text/javascript" src ="${pageContext.request.contextPath }/js/jquery-1.11.1.js"></script>
    18     <script type="text/javascript">
    19         var xmlHttpRequest = null;
    20         function getXmlHttpRequest() {
    21             // 如果非IE
    22             if(window.XMLHttpRequest) {
    23                 xmlHttpRequest = new XMLHttpRequest();
    24             } else if(window.ActiveXObject){
    25                 xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
    26             } 
    27         }
    28         
    29         function ajaxRequest(url, cb, clz, fileName) {
    30             getXmlHttpRequest();
    31             if(xmlHttpRequest) {
    32                 // 初始化设置的动作
    33                 xmlHttpRequest.open("post", url, true);
    34                 xmlHttpRequest.onreadystatechange = cb;
    35                 xmlHttpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    36                 // 正式发送请求
    37                 xmlHttpRequest.send("clz=" + clz + "&fileName=" + fileName);
    38             }
    39         }
    40         
    41         function cb1 () {
    42             if(xmlHttpRequest.readyState == 4 && 
    43                 xmlHttpRequest.status == 200) {
    44                 var result = xmlHttpRequest.responseText;
    45                 alert(result);
    46             }
    47         }
    48         
    49         function cb2 () {
    50             if(xmlHttpRequest.readyState == 4 && 
    51                 xmlHttpRequest.status == 200) {
    52                 var result = xmlHttpRequest.responseText;
    53                 alert(result);
    54                 result = eval("("+result+")");
    55                 for(var v in result) {
    56                     alert(result[v]);
    57                 }
    58             }
    59         }
    60         $(function(){
    61             $("#InputEmpbtn").click(function(){
    62                 ajaxRequest("../Jxl02Servlet",cb1,"entity.Emp","/user.properties");
    63             });
    64             $("#ExputEmpbtn").click(function(){
    65                 ajaxRequest("../OJxl01Servlet",cb2,"entity.Emp");
    66             });
    67         })
    68     </script>
    69   </head>
    70   
    71   <body>
    72       <input id="InputEmpbtn" type="button" value="员工导入" />
    73     <input id="ExputEmpbtn" type="button" value="员工导出" />
    74   </body>
    75 </html>


    反射

    2.

     1 public void doPost(HttpServletRequest request, HttpServletResponse response)
     2             throws ServletException, IOException {
     3 
     4         try{
     5             response.setContentType("text/html");
     6             PrintWriter out = response.getWriter();
     7             
     8             String clzStr = request.getParameter("clz");
     9             String fileName = request.getParameter("fileName");
    10             Class<?> c = Class.forName(clzStr);
    11             Object obj = c.newInstance();
    12             Field[] fields = obj.getClass().getDeclaredFields();
    13             ReaderProperties reader = new ReaderProperties();
    14             for (Field field : fields) {
    15                 field.setAccessible(true);
    16                 String name = field.getName();
    17                 Properties properties =reader.loadProperties(fileName);
    18                 Iterator<Entry<Object, Object>> it = properties.entrySet().iterator();  
    19                 while (it.hasNext()) {  
    20                     Entry<Object, Object> entry = it.next();  
    21                     Object key = entry.getKey();  
    22                     Object value = entry.getValue();  
    23                     if(name.equals(key)) {
    24                         if(field.getType().toString().equals("double")) {
    25                             field.set(obj, Double.valueOf(value.toString()));
    26                         } else {
    27                             field.set(obj, value.toString());
    28                         }
    29                     }
    30                 }  
    31             }
    32             reflectObj(obj);
    33         } catch(Exception e){
    34             e.printStackTrace();
    35         }
    36         
    37     }
    38 
    39     private void reflectObj(Object obj) throws Exception {
    40         File file = new File("d:/obj.xls");
    41         WritableWorkbook book = Workbook.createWorkbook(file);
    42         WritableSheet sheet = book.createSheet("第一个", 0);
    43         Field[] fields = obj.getClass().getDeclaredFields();
    44         for (int i = 0; i < fields.length; i++) {
    45             Field field = fields[i];
    46             field.setAccessible(true);
    47             String name = field.getName();
    48             String v = field.get(obj) == null ? "" : field.get(obj).toString();
    49             Label label1 = new Label(i,0,name);
    50             Label label2 = new Label(i,1,v);
    51             sheet.addCell(label1);
    52             sheet.addCell(label2);
    53         }
    54         book.write();
    55         book.close();
    56     }


    加载配置文件

    3.

     1 package test;
     2 
     3 import java.io.IOException;
     4 import java.io.InputStream;
     5 import java.util.Enumeration;
     6 import java.util.Iterator;
     7 import java.util.Properties;
     8 import java.util.Map.Entry;
     9 
    10 public class ReaderProperties {
    11 
    12     public static void main(String[] args) {
    13         Properties properties = new ReaderProperties().loadProperties("/jdbc.properties");
    14         Enumeration<?> enu = properties.propertyNames();  
    15         while (enu.hasMoreElements()) {  
    16             Object key = enu.nextElement();  
    17             System.out.println(key);  
    18         }  
    19         Enumeration<Object> enu2 = properties.elements();  
    20         while (enu2.hasMoreElements()) {  
    21             Object value = enu2.nextElement();  
    22             System.out.println(value);  
    23         }
    24         
    25         Iterator<Entry<Object, Object>> it = properties.entrySet().iterator();  
    26         while (it.hasNext()) {  
    27             Entry<Object, Object> entry = it.next();  
    28             Object key = entry.getKey();  
    29             Object value = entry.getValue();  
    30             System.out.println("key   :" + key);  
    31             System.out.println("value :" + value);  
    32             System.out.println("---------------");  
    33         }  
    34     }
    35 
    36     
    37     public Properties loadProperties(String resources) {
    38         // 使用InputStream得到一个资源文件
    39         InputStream inputstream = this.getClass()
    40         .getResourceAsStream(resources);
    41         // new 一个Properties
    42         Properties properties = new Properties();
    43         try {
    44             // 加载配置文件
    45             properties.load(inputstream);
    46             return properties;
    47         } catch (IOException e) {
    48             throw new RuntimeException(e);
    49         } finally {
    50             try {
    51                 inputstream.close();
    52             } catch (IOException e) {
    53                 throw new RuntimeException(e);
    54             }
    55         }
    56 
    57     }
    58 }


    配置文件

    4.

    1 deptNo=10
    2 deptName=u8D22u52A1u90E8

    5.

    1 empNo=9527
    2 empName=u5F20u4E09
    3 salary=10000

    6.

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  • 原文地址:https://www.cnblogs.com/cfb513142804/p/4209013.html
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