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 // 1.创建一个xmlHttpRequest对象
20 var xmlHttpRequest = null;
21 // 2.判断浏览器类型
22 function getXmlHttpRequest() {
23 // 如果非IE
24 if(window.XMLHttpRequest) {
25 xmlHttpRequest = new XMLHttpRequest();
26 } else if(window.ActiveXObject){
27 xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
28 }
29 }
30 //ajax请求
31 function ajaxRequest(url, cb, clz, fileName) {
32 // 3.获得浏览器类型
33 getXmlHttpRequest();
34 if(xmlHttpRequest) {
35 //4. 设置提交方式
36 xmlHttpRequest.open("post", url, true);
37 //5. 设置回调函数
38 xmlHttpRequest.onreadystatechange = cb;
39 // 用POST方式请求，必须加上头文件
40 xmlHttpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
41 //6. 正式发送请求（发送多个值（"clz=" + clz + "&fileName=" + fileName）用‘+’号连接，第二个键前加‘&’符）
42 xmlHttpRequest.send("clz=" + clz + "&fileName=" + fileName);
43 }
44 }
45 //回调函数
46 function cb1 () {
47 if(xmlHttpRequest.readyState == 4 &&
48 xmlHttpRequest.status == 200) {
49 // 7.获取响应返回的结果
50 var result = xmlHttpRequest.responseText;
51 alert(result);
52 }
53 }
54
55 function cb2 () {
56 if(xmlHttpRequest.readyState == 4 &&
57 xmlHttpRequest.status == 200) {
58 // 7.获取响应返回的结果
59 var result = xmlHttpRequest.responseText;
60 alert(result);
61 // 8.通过eval("")函数将返回结果进行装载（注意eval("")的用法，里面必须用（）括起来result = eval("("+result+")");）
62 result = eval("("+result+")");
63 for(var v in result) { //Js中的foreach,v为索引
64 alert(result[v]);
65 }
66 }
67 }
68 $(function(){
69 $("#InputEmpbtn").click(function(){
70 // ( url,回调函数，反射需要的包类驱动，要加载的配置文件)
71 ajaxRequest("../Jxl02Servlet",cb1,"entity.Emp","/user.properties");
72 });
73 $("#ExputEmpbtn").click(function(){
74 ajaxRequest("../OJxl01Servlet",cb2,"entity.Emp");
75 });
76 })
77 </script>
78 </head>
79
80 <body>
81 <input id="InputEmpbtn" type="button" value="员工导入" />
82 <input id="ExputEmpbtn" type="button" value="员工导出" />
83 </body>
84 </html>
servlet
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 // 获得‘包类驱动’
8 String clzStr = request.getParameter("clz");
9 // 获得配置文件信息
10 String fileName = request.getParameter("fileName");
11 /*********************************************反射开始***********************************************/
12 //1. 根据’包类驱动‘创建一个类
13 Class<?> c = Class.forName(clzStr);
14 //2. 根据1类创建一个对象
15 Object obj = c.newInstance();
16 //3. 创建一个集合得到2对象的所有属性
17 Field[] fields = obj.getClass().getDeclaredFields();
18 //4. 创建配置文件信息的对象
19 ReaderProperties reader = new ReaderProperties();
20 for (Field field : fields) {
21 field.setAccessible(true);
22 String name = field.getName();
23 // 配置文件-----
24 Properties properties =reader.loadProperties(fileName);
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 if(name.equals(key)) {
31 // 判断字段类型并赋值
32 if(field.getType().toString().equals("double")) {
33 field.set(obj, Double.valueOf(value.toString()));
34 } else {
35 field.set(obj, value.toString());
36 }
37 }
38 }
39 }
40 reflectObj(obj);
41 } catch(Exception e){
42 e.printStackTrace();
43 }
44
45 }
46
47 private void reflectObj(Object obj) throws Exception {
48 File file = new File("d:/obj.xls");
49 WritableWorkbook book = Workbook.createWorkbook(file);
50 WritableSheet sheet = book.createSheet("第一个", 0);
51 Field[] fields = obj.getClass().getDeclaredFields();
52 for (int i = 0; i < fields.length; i++) {
53 Field field = fields[i];
54 field.setAccessible(true);
55 String name = field.getName();
56 String v = field.get(obj) == null ? "" : field.get(obj).toString();
57 Label label1 = new Label(i,0,name);
58 Label label2 = new Label(i,1,v);
59 sheet.addCell(label1);
60 sheet.addCell(label2);
61 }
62 book.write();
63 book.close();
64 }
配置文件
1.user.properties (注意：后缀名一定要写正确 .properties)
1 empNo=9527 2 empName=\u5F20\u4E09 3 salary=10000
2.dept.properties
1 deptNo=10 2 deptName=\u8D22\u52A1\u90E8
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 }
时间： 2024-12-11 17:30:17