java Map转Object与Object转Map实现代码

java map转object与 object转map

1、定义一个实体类：

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转object转换如下：

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;
 }
  
}

运行结果：

run:
kobi
39
成功构建 (总时间: 0 秒)

3、object转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;
 }
}

运行结果： 

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

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