Detailed introduction to java Map to Object and Object to Map implementation codes

This article mainly introduces the relevant information about java Map to Object and Object to Map implementation code. Friends in need can refer to it

java Map to Object and Object to Map

1. Define an entity class:

package reflect;
 
public class User {
  
 private String name;
  
 private int age;
 
 public String getName() {
  return name;
 }
 
 public void setName(String name) {
  this.name = name;
 }
 
 public int getAge() {
  return age;
 }
 
 public void setAge(int age) {
  this.age = age;
 }
}

2. Map to Object conversion is as follows:

package reflect;
 
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
 
public class testMapToObject {
  
 public static void main(String[] args){
   
  //假设有一个Map存放了一个对象的姓名和年龄
  Map<string,object> map = new HashMap<string,object>();
  map.put("name", "Kobi");
  map.put("age", 39);
   
  User user = transferMapToUser(map,User.class);
   
  System.out.println(user.getName());
  System.out.println(user.getAge());
 }
  
 public static <t> T transferMapToUser(Map<string,object> map,Class<t> classT){
  try {
   return transfer(map,classT.newInstance());
  } catch (InstantiationException ex) {
   System.out.println("what the fuck?");
  } catch (IllegalAccessException ex) {
   System.out.println("what the fuck?");
  }
  return null;
 }
  
 public static <t> T transfer(Map<string,object> map,Object obj){
   
  try {
   BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
   PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
 
   for (PropertyDescriptor property : propertyDescriptors) {
    String key = property.getName();
    if (map.containsKey(key)) {
     Object value = map.get(key);
     // 得到property对应的setter方法
     Method setter = property.getWriteMethod();
     try {
      setter.invoke(obj, value);
     } catch (IllegalArgumentException ex) {
      System.out.println("what the fuck?");
     }
    }
   }
  } catch (Exception ex) {
   System.out.println("what the fuck?");
  }
 
  return (T) obj;
 }
  
}

Running results:

run:
Kobi
39
成功构建 (总时间: 0 秒)

3. Object to Map:

package reflect;
 
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.TreeMap;
 
public class testObjectToMap {
  
 public static void main(String[] args){
  User user = new User();
  user.setName("Kobi");
  user.setAge(39);
   
  Map<string, object=""> map = transBean2Map(user);
  System.out.println(map);
   
 }
 
 public static Map<string, object=""> transBean2Map(Object obj) {
 
  if (obj == null) {
   return null;
  }
  TreeMap<string, object=""> map = new TreeMap<>();
  try {
   BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
   PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
   for (PropertyDescriptor property : propertyDescriptors) {
    String key = property.getName();
    // 过滤class属性
    if (key.equals("class")) {
     continue;
    }
     
    // 得到property对应的getter方法
    Method getter = property.getReadMethod();
    Object value = getter.invoke(obj);
     
    map.put(key, value);
   }
  } catch (Exception e) {
   System.out.println("transBean2Map Error " + e);
  }
  return map;
 }
}

Running result:

run:
{age=39, name=Kobi}
成功构建 (总时间: 0 秒)

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