反射为单级属性赋值

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。

package com.apple.demo;

import java.lang.reflect.Field;
import java.lang.reflect.Method;;;

class ClassInstanceFactory{
    private ClassInstanceFactory() {}
    public static <T> T create(Class<?> clazz,String value) {
        try {
            Object obj = clazz.getDeclaredConstructor().newInstance();
            BeanUtils.setValue(obj, value);
            return (T) obj;
        } catch (Exception e) {
            return null;
        }       
    }
}

class BeanUtils{
    private BeanUtils() {}
    public static void setValue(Object obj, String value) {
        String results[] = value.split("\|");
        for(int x=0;x<results.length;x++) {
            String attval[] = results[x].split(":");
            try {
                Field field = obj.getClass().getDeclaredField(attval[0]);
                Method setMethod = obj.getClass().getDeclaredMethod("set"+StringUtils.initcap(attval[0]), field.getType());
                setMethod.invoke(obj, attval[1]);
            } catch (Exception e) {
                e.printStackTrace();
            } 
        }
    }
}

class StringUtils{
    public static String initcap(String str) {
        if(str == null || "".equals(str)) {
            return str;
        }
        if(str.length() == 1) {
            return str.toUpperCase();
        }else {
            return str.substring(0,1).toUpperCase()+str.substring(1);
        }
    }
}

class Emp{
    private String ename;
    private String job;
    public String getEname() {
        return this.ename;
    }
    public void setEname(String ename) {
        this.ename = ename;
    }
    public String getJob() {
        return this.job;
    }
    public void setJob(String job) {
        this.job = job;
    }
}

public class JavaReflectDemo {
    public static void main(String[] args) throws Exception{
        String value = "ename:Smith|job:Clerk";
        Emp emp = ClassInstanceFactory.create(Emp.class, value);
        System.out.println("姓名："+emp.getEname()+"、职位："+emp.getJob());
    }
}

运行结果：

姓名：Smith、职位：Clerk