annotation (DWR 六)

官網連結
也就是不寫dwr.xml，用annotation的方式一樣可以
以前端取資料庫的 method為例，改成annotation

※web.xml

<servlet>
    <servlet-name>dwr-invoker</servlet-name>
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
    <init-param>
        <param-name>debug</param-name>
        <param-value>true</param-value>
    </init-param>
    
    <init-param>
        <param-name>classes</param-name>
        <param-value>
            dao.impl.DaoImpl,
            vo.Chess
        </param-value>
    </init-param>
</servlet>
    
<servlet-mapping>
    <servlet-name>dwr-invoker</servlet-name>
    <url-pattern>/dwr/*</url-pattern>
</servlet-mapping>

※只有增加classes的init-param部分

※這裡增加impl和java bean，如果不寫會在執行時出「DefaultConverterManager convertOutbound」的錯

※impl

@RemoteProxy(name="dao")
public class DaoImpl implements Idao {
    @Override
    @RemoteMethod
    public boolean save(Chess chess) {
        System.out.println("新增成功！");
        return true;
    }
    
    @Override
    @RemoteMethod
    public Chess getChess(Long id) {
        Chess chess = new Chess();
        chess.setId(id);
        chess.setName("象棋");
        chess.setDate(new Date());
        return chess;
    }
    
    @Override
    @RemoteMethod
    public List<Chess> getAllChess() {
        List<Chess> chList = new ArrayList<>();
        for (long i = 1; i < 4; i++) {
            Chess chess = new Chess();
            chess.setId(i);
            if (i == 1) {
                chess.setName("象棋");
            } else if (i == 2) {
                chess.setName("跳棋");
            } else if (i == 3) {
                chess.setName("五子棋");
            }
            try {
                chess.setDate(new SimpleDateFormat("yyyyMMdd").parse("2010061" + i));
            } catch (ParseException e) {
                e.printStackTrace();
            }
            chList.add(chess);
        }
        return chList;
    }
}

※class上多個@RemoteProxy，其他方法上面都是@RemoteMethod

※vo

@DataTransferObject
public class Chess{
    @RemoteProperty
    private Long id;
    
    @RemoteProperty
    private String name;
    
    @RemoteProperty
    private Date date;
    
    // setter/getter...
}

※java bean要轉換要使用@DataTransferObject，而欄位用@RemoteProperty