JAVA中map转换成实体对象

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/**

• @ClassName:QueryVOToBeanUtil

• @author: 短笛吟风

• @description:TODO

• @createDate: 2020/2/18

• @version: 1.0
  */
  public class QueryVOToBeanUtil {

  /**

  • 将JavaBean转换成Map

  • @param obj

  • @return

  • @throws SecurityException

  • @throws NoSuchMethodException

  • @throws InvocationTargetException

  • @throws IllegalArgumentException

  • @throws IllegalAccessException
    */
    public static Map beanToMap(Object obj) throws NoSuchMethodException, SecurityException, IllegalAccessException,
    IllegalArgumentException, InvocationTargetException {
    // 创建map集合
    Map map = new HashMap();
    // 获取JavaBean中所有属性
    Field[] fields = obj.getClass().getDeclaredFields();

    for (Field fie : fields) {

     // 将属性第一个字母转换成大写
     String frist = fie.getName().substring(0, 1).toUpperCase();
     // 获取属性的类型
     Class<?> type = fie.getType();
     // 封装属性的get
     String getter = "";
     if ("boolean".equals(type.getName())) {
         getter = "is" + frist + fie.getName().substring(1);
     } else {
         getter = "get" + frist + fie.getName().substring(1);
     }
     // 获取JavaBean的方法
     Method method = obj.getClass().getMethod(getter, new Class[] {});
     // 调用方法,并接收返回值
     Object objec = method.invoke(obj, new Object[] {});
    
     // 判断返回值不为空
     if (objec != null) {
         map.put(fie.getName(), objec);
     } else {
         map.put(fie.getName(), "");
     }
    

    }

    return map;
    }

  /**

  • 将Map转换为JavaBean

  • @param map

  • @param obj

  • @return

  • @throws SecurityException

  • @throws NoSuchMethodException

  • @throws InvocationTargetException

  • @throws IllegalArgumentException

  • @throws IllegalAccessException
    */
    public static Object mapToBean(Map<String, Object> map, Object obj) throws NoSuchMethodException, SecurityException,
    IllegalAccessException, IllegalArgumentException, InvocationTargetException {

    // 获取JavaBean中的所有属性
    Field[] field = obj.getClass().getDeclaredFields();

    for (Field fi : field) {
    // 判断key值是否存在
    String fildname=addStringXhx(fi.getName());
    if (map.containsKey(fildname)) {
    // 获取key的value值

         String value = map.get(fildname).toString();
         // 将属性的第一个字母转换为大写
         String frist = fi.getName().substring(0, 1).toUpperCase();
         // 属性封装set方法
         String setter = "set" + frist + fi.getName().substring(1);
         // 获取当前属性类型
         Class<?> type = fi.getType();
         // 获取JavaBean的方法,并设置类型
         Method method = obj.getClass().getMethod(setter, type);
    
         // 判断属性为double类型
         if ("java.lang.String".equals(type.getName())) {
    
             // 调用当前Javabean中set方法，并传入指定类型参数
             method.invoke(obj, value);
    
         } else if ("int".equals(type.getName())) {
    
             method.invoke(obj, Integer.parseInt(value));
    
         }else if ("double".equals(type.getName())) {
    
             method.invoke(obj, Double.valueOf(value));
    
    
         } else if ("char".equals(type.getName())) {
    
             method.invoke(obj, value);
    
         }
     }
    

    }

    return obj;
    }

  private static String addStringXhx(String name) {

   StringBuilder stringBuilder=new StringBuilder(name.length()+5);
   int len=name.length();
   for(int i=0;i<len;i++){
       char c = name.charAt(i);
       if(Character.isUpperCase(c)){
           stringBuilder.append("_"+Character.toLowerCase(c));
       }else{
           stringBuilder.append(c);
       }
  
   }
   return stringBuilder.toString();
  

  }

  /**

  • 将List<Map<String,Object>>转换成List

  • @param listm

  • @param obj

  • @return

  • @throws InvocationTargetException

  • @throws IllegalArgumentException

  • @throws IllegalAccessException

  • @throws SecurityException

  • @throws NoSuchMethodException
    */
    public static List ListMapToListBean(List<Map<String, Object>> listm, Object obj)
    throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException,
    InvocationTargetException {

    List list = new ArrayList();
    // 循环遍历出map对象
    for (Map<String, Object> m : listm) {
    // 调用将map转换为JavaBean的方法
    Object objs = mapToBean(m, obj);
    // 添加进list集合
    list.add(objs);
    }

    return list;
    }

  /**

  • 将list转换为List

  • @param list

  • @return

  • @throws NoSuchMethodException

  • @throws SecurityException

  • @throws IllegalAccessException

  • @throws IllegalArgumentException

  • @throws InvocationTargetException
    */
    public static List<Map<String, Object>> ListBeanToListMap(List list) throws NoSuchMethodException,
    SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {

    List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>();

    for (Object ob : list) {

     listmap.add(beanToMap(ob));
    

    }

    return listmap;
    }

}

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