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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="http://www.mamicode.com/styles.css">16 -->17 <script type="text/javascript" src ="http://www.mamicode.com/${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IE22 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="http://www.mamicode.com/员工导入" />73 <input id="ExputEmpbtn" type="button" value="http://www.mamicode.com/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 =http://www.mamicode.com/ 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 =http://www.mamicode.com/ 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 =http://www.mamicode.com/ 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Properties42 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=102 deptName=\u8D22\u52A1\u90E8
5.
1 empNo=95272 empName=\u5F20\u4E093 salary=10000
6.
动态反射
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