简单Java类中的组成较为单一,在赋值中只需要通过反射考虑获取相应的Field与Method实例就可以实现赋值处理,课程主要讲解对于单个VO类实例化对象实现的属性赋值处理操作。
1 package com.apple.demo; 2 3 import java.lang.reflect.Field; 4 import java.lang.reflect.Method;;; 5 6 class ClassInstanceFactory{ 7 private ClassInstanceFactory() {} 8 public static <T> T create(Class<?> clazz,String value) { 9 try { 10 Object obj = clazz.getDeclaredConstructor().newInstance(); 11 BeanUtils.setValue(obj, value); 12 return (T) obj; 13 } catch (Exception e) { 14 return null; 15 } 16 17 } 18 } 19 20 class BeanUtils{ 21 private BeanUtils() {} 22 public static void setValue(Object obj, String value) { 23 String results[] = value.split("\\|"); 24 for(int x=0;x<results.length;x++) { 25 String attval[] = results[x].split(":"); 26 try { 27 Field field = obj.getClass().getDeclaredField(attval[0]); 28 Method setMethod = obj.getClass().getDeclaredMethod("set"+StringUtils.initcap(attval[0]), field.getType()); 29 setMethod.invoke(obj, attval[1]); 30 } catch (Exception e) { 31 // TODO Auto-generated catch block 32 e.printStackTrace(); 33 } 34 } 35 } 36 } 37 38 class StringUtils{ 39 public static String initcap(String str) { 40 if(str == null || "".equals(str)) { 41 return str; 42 } 43 if(str.length() == 1) { 44 return str.toUpperCase(); 45 }else { 46 return str.substring(0,1).toUpperCase()+str.substring(1); 47 } 48 } 49 } 50 51 class Emp{ 52 private String ename; 53 private String job; 54 public String getEname() { 55 return this.ename; 56 } 57 public void setEname(String ename) { 58 this.ename = ename; 59 } 60 public String getJob() { 61 return this.job; 62 } 63 public void setJob(String job) { 64 this.job = job; 65 } 66 } 67 68 public class JavaReflectDemo { 69 public static void main(String[] args) throws Exception{ 70 String value = "ename:Smith|job:Clerk"; 71 Emp emp = ClassInstanceFactory.create(Emp.class, value); 72 System.out.println("姓名:"+emp.getEname()+"、职位:"+emp.getJob()); 73 } 74 }
运行结果:
姓名:Smith、职位:Clerk