基于Java反射的map自动装配JavaBean工具类设计示例代码

public List<Role> findRoles(Map<String,Object> param);
<select id="dindRoles" parameterType="map" resultType="role">
  select id,role_name as roleName,note form t_role
  where role_name = #{roleName}
  and note = #{note}
</select>

//我们常常需要手打这些字段名
Map<String,Object> map = new HashMap<>();
map.put("roleName","xiaoming");
map.put("note","10");
List<Role> roles = roleMapper.findRoles(map);

public class Test {
  //实现效果
  public static void main(String[] args) {
    HashMap<String, Object> map = new HashMap<>();
    Person person1 = new Person();
    person1.setAge(2);
    person1.setName("foonsu");
    //调用写好的mapBuild自动装配
    mapBuild(person1, map);
    //输出效果
    for (Map.Entry entry : map.entrySet()) {
      System.out.println(entry.getKey() + ":" + entry.getValue());
    }
  }
  public static void mapBuild(Object javaBean, Map map) {
    Class clazz = javaBean.getClass();
    //反射获取
    Field[] name = clazz.getDeclaredFields();
    for (Field field : name) {
      //将非null的javaBean属性值装配到map中
      if (getGetMethod(javaBean,field.getName())!=null)
        map.put(field.getName(), getGetMethod(javaBean,field.getName()));
    }
  }
  /**
   * 根据属性，获取get方法
   */
  public static Object getGetMethod(Object ob, String name) {
    Method[] m = ob.getClass().getMethods();
    try {
      for (int i = 0; i < m.length; i++) {
        if (("get" + name).toLowerCase().equals(m[i].getName().toLowerCase())) {
          return m[i].invoke(ob);
        }
      }
    } catch (Exception e) {
    }
    return null;
  }
}
class Person{
  int age;
  String name;
  String personId;

  public String getPersonId() {
    return personId;
  }

  public void setPersonId(String personId) {
    this.personId = personId;
  }

  public int getAge() {
    return age;
  }

  public void setAge(int age) {
    this.age = age;
  }

  public String getName() {
    return name;
  }

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