BeanUtils.copyProperty的用法问题

[xharry]

我想写一个类，把Database的ResultSet封装一下。用了BeanUtils.copyProperty方法，总是报如下错误：

USING CONVERTER org.apache.commons.beanutils.converters.IntegerConverter@1befab0
java.lang.reflect.InvocationTargetException: Cannot set id
at org.apache.commons.beanutils.BeanUtilsBean.copyProperty(BeanUtilsBean.java:449)
at org.apache.commons.beanutils.BeanUtils.copyProperty(BeanUtils.java:129)


Caused by: java.lang.NoSuchMethodException: Property 'id' has no setter method
at org.apache.commons.beanutils.PropertyUtilsBean.setSimpleProperty(PropertyUtilsBean.java:1746)
at org.apache.commons.beanutils.BeanUtilsBean.copyProperty(BeanUtilsBean.java:447)


可是，UserInfo这个bean里面明明有set方法，而且是public，eclipse总是报错说找不到set方法。

有知道为什么的么？


下面为代码：

/**
 * 
 * @author wcharry
 * 
 */
public class MyDataSet {
	private static Log log = LogFactory.getLog(MyDataSet.class);
	private List list = new ArrayList();

	public MyDataSet(ResultSet rs) {
		try {
			dumpResultSet(rs);
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public MyDataSet(ResultSet rs, Class clazz) {
		try {
			dumpResultSet(rs, clazz);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public int size() {
		return list.size();
	}

	public Object get(int i) {
		return list.get(i);
	}

	public Object get(int row, int col) {
		HashMap hm = (HashMap) list.get(row);

		Iterator iterator = hm.values().iterator();
		int iCol = 0;
		while (iterator.hasNext()) {
			if (iCol == col)
				return iterator.next();

			iCol++;
		}

		return null;
	}

	public Object get(int row, String key) {
		HashMap hm = (HashMap) list.get(row);

		return hm.get(key);
	}


	private void dumpResultSet(ResultSet rs, Class clazz) throws Exception {
		ResultSetMetaData metaData = (ResultSetMetaData) rs.getMetaData();
		int colCount = metaData.getColumnCount();

		Field[] fields = clazz.getDeclaredFields();

		while (rs.next()) {
			Object newInstance = clazz.newInstance();
			
			for (int i = 1; i <= colCount; i++) {
				try {
					Object value = rs.getObject(i);
					for (int j = 0; j < fields.length; j++) {
						Field f = fields[j];
						if (f.getName().equalsIgnoreCase(
								metaData.getColumnName(i).replaceAll("_", ""))) {

							log.info("f.getName:" + f.getName());

							// 这里总是报错
							BeanUtils.copyProperty(newInstance, f.getName(),
									value);

							log.info("value:" + value);
							break;
						}
					}
				} catch (Exception e) {
					e.printStackTrace();
				}

			}

			list.add(newInstance);
		}
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		String sql = "SELECT * FROM users";
		ResultSet rs = DatabaseFactory.getInstance("mysql").executeQuery(sql);

		MyDataSet ds2 = new MyDataSet(rs, UserInfo.class);

		for (int i = 0; i < ds2.size(); ++i) {
			UserInfo o = (UserInfo) ds2.get(i);
			System.out.println(o.getUser());
		}

		DatabaseFactory.getInstance("mysql").closeConnection();
	}
}



class UserInfo {
	private int id;
	private String user;
	private String password;

	public UserInfo() {
	}

	// public String toString() {
	// return "id:" + id + ", user:" + user;
	// }

	public String getUser() {
		return user;
	}

	public void setUser(String user) {
		this.user = user;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}
}

[xharry]

原因找到了

class UserInfo {

改为

public class UserInfo {

就可以了，WTF！！

[kokobox]

自问自答啊？

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