java实现Object和Map之间的转换3种方式

利用commons.beanutils实现obj和map之间转换，这种是最简单，也是最经常用的

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);
  }

利用java reflect完成obj和map之间的相互转换

    public map<string,object> obj2map(object obj) throws exception{
      map<string,object> map=new hashmap<string, object>();
      field[] fields = obj.getclass().getdeclaredfields();
      for(field field:fields){
        field.setaccessible(true);
        map.put(field.getname(), field.get(obj));
      }
      return map;
    }
    public object map2obj(map<string,object> map,class<?> clz) throws exception{
      object obj = clz.newinstance();
      field[] declaredfields = obj.getclass().getdeclaredfields();
      for(field field:declaredfields){
        int mod = field.getmodifiers(); 
        if(modifier.isstatic(mod) || modifier.isfinal(mod)){
          continue;
        }
        field.setaccessible(true);
        field.set(obj, map.get(field.getname()));
      }
      return obj;
    }

利用introspector完成obj和map之间的相互转换

public map<string,object> obj2map(object obj) throws exception{
      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;
    }
    
    public object map2obj(map<string,object> map,class<?> clz) throws exception{
      if (map == null)  
        return null;  
      object obj = clz.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;
    }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。