java用Cglib自动生成类，自动生成get/set方法

费话少说，直接上代码:

示例:

package com.iaiai.test;

import java.util.HashMap;
import java.util.Map;

import net.sf.cglib.asm.ClassVisitor;
import net.sf.cglib.asm.Type;
import net.sf.cglib.beans.BeanGenerator;
import net.sf.cglib.core.ClassEmitter;
import net.sf.cglib.core.Constants;
import net.sf.cglib.core.EmitUtils;

/**
 * 
 * <p>
 * Title: BeanGeneratorObj.java
 * </p>
 * <p>
 * E-Mail: [e-mail]
 * </p>
 * <p>
 * QQ: 176291935
 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2011-11-2
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class BeanGeneratorObj extends BeanGenerator {
	
	public BeanGeneratorObj() {
        super();
    }

	private Map props = new HashMap();

	public void addProperty(String name, Class type) {
		super.addProperty(name, type);
		if (props.containsKey(name)) {
			throw new IllegalArgumentException("Duplicate property name \"" + name + "\"");
		}
		props.put(name, Type.getType(type));
	}

	public void generateClass(ClassVisitor v) throws Exception {
		int size = props.size();
		String[] names = (String[]) props.keySet().toArray(new String[size]);
		Type[] types = new Type[size];
		for (int i = 0; i < size; i++) {
			types[i] = (Type) props.get(names[i]);
		}
		ClassEmitter ce = new ClassEmitter(v);
		ce.begin_class(Constants.V1_2, Constants.ACC_PUBLIC, getClassName(),
				getDefaultClassLoader() != null ? Type.getType(getDefaultClassLoader().getClass())
						: Constants.TYPE_OBJECT, null, null);
		EmitUtils.null_constructor(ce);
		add_properties(ce, names, types);
		ce.end_class();
	}
	
	private void add_properties(ClassEmitter ce, String[] names, Type[] types) {
        for (int i = 0; i < names.length; i++) {
            String fieldName = names[i];
            ce.declare_field(Constants.ACC_PRIVATE, fieldName, types[i], null);
            EmitUtils.add_property(ce, names[i], types[i], fieldName);
        }
    }

}

package com.iaiai.test;

import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import net.sf.cglib.beans.BeanGenerator;
import net.sf.cglib.beans.BeanMap;

/**
 * 
 * <p>
 * Title: CglibBean.java
 * </p>
 * <p>
 * E-Mail: [e-mail]
 * </p>
 * <p>
 * QQ: 176291935
 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2011-11-16
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class CglibBean {

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

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

	public CglibBean() {
		super();
	}

	@SuppressWarnings("unchecked")
	public CglibBean(Map propertyMap) {
		this.object = generateBean(propertyMap);
		this.beanMap = BeanMap.create(this.object);
	}
	
	public CglibBean(String className,Map propertyMap) {
		this.object = generateBean(className,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;
	}

	private Object generateBean(Map propertyMap) {
		BeanGenerator generator = new BeanGenerator();
		Set keySet = propertyMap.keySet();
		for (Iterator i = keySet.iterator(); i.hasNext();) {
			String key = (String) i.next();
			generator.addProperty(key, (Class) propertyMap.get(key));
		}
		return generator.create();
	}
	
	private Object generateBean(final String className,Map propertyMap) {
		BeanGeneratorObj generator = new BeanGeneratorObj();
		
		generator.setNamingPolicy(new NamingPolicy() {
			@Override
			public String getClassName(String prefix, String source, Object key, Predicate names) {
				return className;
			}
		});
		Set keySet = propertyMap.keySet();
		for (Iterator i = keySet.iterator(); i.hasNext();) {
			String key = (String) i.next();
			generator.addProperty(key, (Class) propertyMap.get(key));
		}
		return generator.create();
	}

}

package com.iaiai.test;

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

/**
 * 
 * <p>
 * Title: CglibTest.java
 * </p>
 * <p>
 * E-Mail: [e-mail]
 * </p>
 * <p>
 * QQ: 176291935
 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2011-11-16
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class CglibTest {

	public static void main(String[] args) throws Exception {
		List<String> list = new ArrayList<String>();
		list.add("测试1");
		list.add("测试2");

		Map<String, Object> map = new HashMap<String, Object>();
		map.put("test1", "map value1");
		map.put("test2", "map value2");

		// 设置类成员属性
		Map propertyMap = new HashMap();
		propertyMap.put("id", Class.forName("java.lang.Integer"));
		propertyMap.put("name", Class.forName("java.lang.String"));
		propertyMap.put("address", Class.forName("java.lang.String"));
		propertyMap.put("age", Class.forName("java.lang.Long"));
		propertyMap.put("list", Class.forName("java.util.List"));
		propertyMap.put("map", Class.forName("java.util.Map"));

		// 生成动态 Bean
		CglibBean bean = new CglibBean("com.iaiai.BaseObject",propertyMap);

		// 给 Bean 设置值
		bean.setValue("id", new Integer(123));
		bean.setValue("name", "454");
		bean.setValue("address", "789");
		bean.setValue("age", new Long(321));
		bean.setValue("list", list);
		bean.setValue("map", map);

		// 从 Bean 中获取值，当然了获得值的类型是 Object
		System.out.println("  >> class      = " + bean.getObject().getClass());
		System.out.println("  >> id      = " + bean.getValue("id"));
		System.out.println("  >> name    = " + bean.getValue("name"));
		System.out.println("  >> address = " + bean.getValue("address"));
		System.out.println("  >> age = " + bean.getValue("age"));
		System.out.println("  >> list instanceof = " + (bean.getValue("list") instanceof List));
		System.out.println("  >> list.size = " + ((List) bean.getValue("list")).size());
		System.out.println("  >> list[0] = " + ((List) bean.getValue("list")).get(0));
		System.out.println("  >> map instanceof = " + (bean.getValue("map") instanceof Map));
		System.out.println("  >> map.size = " + ((Map) bean.getValue("map")).size());
		System.out.println("  >> map.value = " + ((Map) bean.getValue("map")).get("test1"));

		// 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());
		}

		System.out.println("********************");
		test(object);
	}

	private static void test(Object obj) throws Exception {
		// 设置类成员属性
		HashMap propertyMap = new HashMap();
		propertyMap.put("id", Class.forName("java.lang.Integer"));
		propertyMap.put("name", Class.forName("java.lang.String"));
		propertyMap.put("address", Class.forName("java.lang.String"));
		propertyMap.put("object", obj.getClass());

		// 生成动态 Bean
		CglibBean bean = new CglibBean("com.iaiai.BaseObject1",propertyMap);

		// 给 Bean 设置值
		bean.setValue("id", new Integer(1232));
		bean.setValue("name", "4542");
		bean.setValue("address", "7892");
		bean.setValue("object", obj);

		// 从 Bean 中获取值，当然了获得值的类型是 Object
		System.out.println("  >> class      = " + bean.getObject().getClass());
		System.out.println("  >> id      = " + bean.getValue("id"));
		System.out.println("  >> name    = " + bean.getValue("name"));
		System.out.println("  >> address = " + bean.getValue("address"));
		System.out.println("  >> object = " + bean.getValue("object"));
		System.out.println("  >> object instanceof String = " + (bean.getValue("object") instanceof String));
		System.out.println("  >> object instanceof Object= " + (bean.getValue("object") instanceof Object));

		Class cls = bean.getObject().getClass();

		System.out.println("&&&&&&&&&&&&&&&&&&&&&&&&&&&&");
		Field[] fields = cls.getDeclaredFields();
		for(Field field:fields){
			System.out.println(field.getName());
		}
	}

}

用到的包:
cglib-nodep-2.2.jar从附件里下载

评论

1 楼 huyuancai1010 2013-12-24  

Field[] fields = cls.getDeclaredFields(); 
for(Field field:fields){ 
    System.out.println(field.getName()); 
}

这一步走完打印出来的值不是id,name,address