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:
用到的包:
cglib-nodep-2.2.jar从附件里下载
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: [email protected] * </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: [email protected] * </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: [email protected] * </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