动态bean生成

来源：互联网发布：达内java简历模板编辑：程序博客网时间：2024/05/16 13:50

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.springframework.cglib.beans.BeanGenerator;
import org.springframework.cglib.beans.BeanMap;

/**
* 动态bean生成类
* @author manman
*
*/
public class DynamicBeanUtil {

/**
* 实体Object
*/
private Object object = null;

/**
* 属性map
*/
private BeanMap beanMap = null;

public DynamicBeanUtil() {
super();
}

public DynamicBeanUtil(Map<String, Object> propertyMap) {
this.object = generateBean(propertyMap);
this.beanMap = BeanMap.create(this.object);
}

/**
* 给bean属性赋值
*
* @param property 属性名
*
* @param value
* 值
*/
public void setValue(String property, Object value) {
beanMap.put(property, value);
}

/**
* 通过属性名得到属性值
*
* @param property 属性名
*
* @return 值
*/
public Object getValue(String property) {
return beanMap.get(property);
}

/**
* 得到该实体bean对象
* @return
*/
public Object getObject() {
return this.object;
}

/**
* @param propertyMap
* @return
*/
@SuppressWarnings("rawtypes")
private Object generateBean(Map<String, Object> propertyMap) {
BeanGenerator generator = new BeanGenerator();
Set<String> keySet = propertyMap.keySet();
for (Iterator<String> i = keySet.iterator(); i.hasNext();) {
String key = (String) i.next();
generator.addProperty(key, (Class) propertyMap.get(key));
}
return generator.create();
}

/**
* 根据xml属性来创建相应的bean集合
*
* @param list xml对应的属性集合
*
* @param dataList 需要生成bean集合的数据集合
*
* @return
* @throws Exception
*/
public static List<Object> xmlPropCreateBeanList(List<Map<String, Object>> list,List<Map<String, Object>> dataList) throws Exception{
/*
* 设置bean成员属性
*/
Map<String, Object> propertyMap = new LinkedHashMap<>();
for (Map<String, Object> map : list) {
String key = (String) map.get("key");
String value = (String) map.get("type");
propertyMap.put(key, Class.forName(value));
}

/*
* bean集合
*/
List<Object> objs = new ArrayList<>();
for (Map<String, Object> m : dataList) {
/*
* 生成动态 Bean
*/
DynamicBeanUtil bean = new DynamicBeanUtil(propertyMap);
Set<String> set = m.keySet();
for (String s : set) {
bean.setValue(s, m.get(s).toString());
}
/*
* 获得bean的实体
*/
Object object = bean.getObject();
objs.add(object);
}
return objs;
}

/**
* 测试类
* @param args
* @throws ClassNotFoundException
*/
@SuppressWarnings("rawtypes")
public static void main(String[] args) throws ClassNotFoundException {

// 设置类成员属性
Map<String, Object> propertyMap = new HashMap<>();

//从xml中读取属性名和属性类型

propertyMap.put("id", Class.forName("java.lang.Integer"));

propertyMap.put("name", Class.forName("java.lang.String"));

propertyMap.put("address", Class.forName("java.lang.String"));

// 生成动态 Bean
DynamicBeanUtil bean = new DynamicBeanUtil(propertyMap);

// 给 Bean 设置值
bean.setValue("id", new Integer(123));

bean.setValue("name", "454");

bean.setValue("address", "789");

// 从 Bean 中获取值，当然了获得值的类型是 Object

System.out.println(" >> id = " + bean.getValue("id"));

System.out.println(" >> name = " + bean.getValue("name"));

System.out.println(" >> address = " + bean.getValue("address"));

// 获得bean的实体
Object object = bean.getObject();

// 通过反射查看所有方法名
Class clazz = object.getClass();
Method[] methods = clazz.getDeclaredMethods();
for (int i = 0; i < methods.length; i++) {
System.out.println(methods[i].getName());
}
}

}

0 0