map和java对象的转换方法

package com.xkeshi.payment.sdk.zhejunion;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

/**
* Created by jiangzw on 2017/10/17.
*/
public class MapDemo {

/*-----------使用org.apache.commons.beanutils进行转换-----------*/
public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {
if (map == null) {
return null;
}

Object obj = beanClass.newInstance();

org.apache.commons.beanutils.BeanUtils.populate(obj, map);

return obj;
}

public static Map<?, ?> objectToMap(Object obj) {
if (obj == null) {
return null;
}

return new org.apache.commons.beanutils.BeanMap(obj);
}
/*-----------------------------------------------------*/

/**********************使用Introspector进行转换**********************/
public static Object mapToObject2(Map<String, Object> map, Class<?> beanClass) throws Exception {
if (map == null)
return null;

Object obj = beanClass.newInstance();

BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
Method setter = property.getWriteMethod();
if (setter != null) {
setter.invoke(obj, map.get(property.getName()));
}
}

return obj;
}

public static Map<String, Object> objectToMap2(Object obj) throws Exception {
if(obj == null)
return null;

Map<String, Object> map = new HashMap<String, Object>();

BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName();
if (key.compareToIgnoreCase("class") == 0) {
continue;
}
Method getter = property.getReadMethod();
Object value = getter!=null ? getter.invoke(obj) : null;
map.put(key, value);
}

return map;
}
/********************************************/

/*#############################使用reflect进行转换#############################*/
public static Object mapToObject3(Map<String, Object> map, Class<?> beanClass) throws Exception {
if (map == null)
return null;

Object obj = beanClass.newInstance();

Field[] fields = obj.getClass().getDeclaredFields();
for (Field field : fields) {
int mod = field.getModifiers();
if(Modifier.isStatic(mod) || Modifier.isFinal(mod)){
continue;
}

field.setAccessible(true);
field.set(obj, map.get(field.getName()));
}

return obj;
}

public static Map<String, Object> objectToMap3(Object obj) throws Exception {
if(obj == null){
return null;
}
Map<String, Object> map = new HashMap<String, Object>();

Field[] declaredFields = obj.getClass().getDeclaredFields();
for (Field field : declaredFields) {
field.setAccessible(true);
map.put(field.getName(), field.get(obj));
}

return map;
}
/*##########################################################*/

public static class Person {
String id;
String name;

public Person() {
}

public Person(String id, String name) {
this.id = id;
this.name = name;
}

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}

public static void main(String[] args) {
Map<String, Object> map = new HashMap<String, Object>();
map.put("id", "1001");
map.put("name", "jzw");

Person person = new Person("1001", "jzw");

try {
Person person1 = (Person) mapToObject(map, Person.class);
System.out.println("person1.id= " + person1.getId());
System.out.println("person1.name= " + person1.getName());
Map<String, Object> map1 = (Map<String, Object>) objectToMap(person);
System.out.println("map1.id= " + map1.get("id"));
System.out.println("map1.name= " + map1.get("name"));
} catch (Exception e) {
e.printStackTrace();
}

try {
Person person2 = (Person) mapToObject2(map, Person.class);
System.out.println("person2.id= " + person2.getId());
System.out.println("person2.name= " + person2.getName());
Map<String, Object> map2 = (Map<String, Object>) objectToMap2(person);
System.out.println("map2.id= " + map2.get("id"));
System.out.println("map2.name= " + map2.get("name"));
} catch (Exception e) {
e.printStackTrace();
}

try {
Person person3 = (Person) mapToObject3(map, Person.class);
System.out.println("person3.id= " + person3.getId());
System.out.println("person3.name= " + person3.getName());
Map<String, Object> map3 = (Map<String, Object>) objectToMap3(person);
System.out.println("map3.id= " + map3.get("id"));
System.out.println("map3.name= " + map3.get("name"));
} catch (Exception e) {
e.printStackTrace();
}

}

}