数据库中float类型字段，转化到前端显示，统一保留两位小数

public class TwoDecimalFloatTypeHander implements  TypeHandler<String> {
	private static DecimalFormat decimalFormat=new DecimalFormat(".00");
	
	public String getResult(ResultSet resultSet, String columnName) throws SQLException {
		return decimalFormat.format(Double.parseDouble(resultSet.getString(columnName)));
		
	}

	public String getResult(ResultSet resultSet, int i) throws SQLException {
		return decimalFormat.format(Double.parseDouble(resultSet.getString(i)));
	}

	public String getResult(CallableStatement callableStatement, int columnIndex)
			throws SQLException {
		return  decimalFormat.format(Double.parseDouble(callableStatement.getString(columnIndex)));  
	}

	public void setParameter(PreparedStatement ps, int i, String str,
			JdbcType jdbcType) throws SQLException {
		ps.setFloat(i,Float.parseFloat(str));
	}
}