JAVA“动态”为类添加属性

<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.3</version>
</dependency><dependency>
<groupId>cglib</groupId>
<artifactId>cglib-nodep</artifactId>
<version>3.2.4</version>
</dependency>

package com.frinder.util;import com.google.common.collect.Maps;
import com.kiktech.entity.LoggerEntity;
import net.sf.cglib.beans.BeanGenerator;
import net.sf.cglib.beans.BeanMap;
import org.apache.commons.beanutils.PropertyUtilsBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.beans.PropertyDescriptor;
import java.util.HashMap;
import java.util.Map;/**
* Created by frinder on 2017/7/18.
*/
public class ReflectUtil { static Logger logger = LoggerFactory.getLogger(ReflectUtil.class); public static Object getTarget(Object dest, Map<String, Object> addProperties) {
// get property map
PropertyUtilsBean propertyUtilsBean = new PropertyUtilsBean();
PropertyDescriptor[] descriptors = propertyUtilsBean.getPropertyDescriptors(dest);
Map<String, Class> propertyMap = Maps.newHashMap();
for (PropertyDescriptor d : descriptors) {
if (!"class".equalsIgnoreCase(d.getName())) {
propertyMap.put(d.getName(), d.getPropertyType());
}
}
// add extra properties
addProperties.forEach((k, v) -> propertyMap.put(k, v.getClass()));
// new dynamic bean
DynamicBean dynamicBean = new DynamicBean(dest.getClass(), propertyMap);
// add old value
propertyMap.forEach((k, v) -> {
try {
// filter extra properties
if (!addProperties.containsKey(k)) {
dynamicBean.setValue(k, propertyUtilsBean.getNestedProperty(dest, k));
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
}
});
// add extra value
addProperties.forEach((k, v) -> {
try {
dynamicBean.setValue(k, v);
} catch (Exception e) {
logger.error(e.getMessage(), e);
}
});
Object target = dynamicBean.getTarget();
return target;
} public static void main(String[] args) {
LoggerEntity entity = new LoggerEntity();
entity.setAppName("appname");
entity.setOperator("add");
entity.setResult("result");
entity.setUri("uri");
entity.setMethod("method");
Map<String, Object> addProperties = new HashMap() {{
put("hello", "world");
put("abc", "123");
}};
System.out.println(getTarget(entity, addProperties));
} public static class DynamicBean {
/**
* 目标对象
*/
private Object target; /**
* 属性集合
*/
private BeanMap beanMap; public DynamicBean(Class superclass, Map<String, Class> propertyMap) {
this.target = generateBean(superclass, propertyMap);
this.beanMap = BeanMap.create(this.target);
} /**
* bean 添加属性和值
*
* @param property
* @param value
*/
public void setValue(String property, Object value) {
beanMap.put(property, value);
} /**
* 获取属性值
*
* @param property
* @return
*/
public Object getValue(String property) {
return beanMap.get(property);
} /**
* 获取对象
*
* @return
*/
public Object getTarget() {
return this.target;
} /**
* 根据属性生成对象
*
* @param superclass
* @param propertyMap
* @return
*/
private Object generateBean(Class superclass, Map<String, Class> propertyMap) {
BeanGenerator generator = new BeanGenerator();
if (null != superclass) {
generator.setSuperclass(superclass);
}
BeanGenerator.addProperties(generator, propertyMap);
return generator.create();
}
}}

package com.frinder.entity;import net.logstash.logback.encoder.org.apache.commons.lang.builder.ReflectionToStringBuilder;/**
* Created by frinder on 2017/5/24.
*/
public class LoggerEntity { private String method;
private String uri;
private Object[] args;
private Object result;
private String operator;
private String appName; /**
* 获取当前对象
*
* @param method
* @param uri
* @param args
* @param result
* @return
*/
public LoggerEntity get(String method, String uri, Object[] args, Object result, String operator, String appName) {
setMethod(method);
setUri(uri);
setArgs(args);
setResult(result);
setOperator(operator);
setAppName(appName);
return this;
} public String getMethod() {
return method;
} public void setMethod(String method) {
this.method = method;
} public String getUri() {
return uri;
} public void setUri(String uri) {
this.uri = uri;
} public Object[] getArgs() {
return args;
} public void setArgs(Object[] args) {
this.args = args;
} public Object getResult() {
return result;
} public void setResult(Object result) {
this.result = result;
} public String getOperator() {
return operator;
} public void setOperator(String operator) {
this.operator = operator;
} public String getAppName() {
return appName;
} public void setAppName(String appName) {
this.appName = appName;
} @Override
public String toString() {
return ReflectionToStringBuilder.toString(this);
}
}