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=\u8D22\u52A1\u90E8
5.
1 empNo=9527 2 empName=\u5F20\u4E09 3 salary=10000
6.
时间： 2024-10-08 10:04:55