java.lang.NullPointerException

	at com.tchManage.dao.PostDAO.findAllPost(PostDAO.java:39)

	at com.tchManage.servlet.PostController.findAll(PostController.java:131)

	at com.tchManage.servlet.PostController.doPost(PostController.java:40)

	at com.tchManage.servlet.PostController.doGet(PostController.java:147)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)

	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)

	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)

	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)

	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)

	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

	at java.lang.Thread.run(Thread.java:619)

public List<Post> findAllPost(int currentPage) throws SQLException,ClassNotFoundException{

		try{

			ResultSet rs=pl.pageList(5,"userinfo",currentPage,"desc","id");（39）

			System.out.println(rs);

			rs.beforeFirst();

			List<Post> list=new ArrayList<Post>();

			

			while(rs.next()){

				Post u=new Post();

				u.setId(rs.getInt("id"));

				u.setTitle(rs.getString("title"));

				u.setContent(rs.getString("content"));

				u.setTime(rs.getString("time"));

				

				list.add(u);	

			}

			return list;

			

		}catch(Exception e){

			e.printStackTrace();

		}

//查找所有公告

	private void findAll(HttpServletRequest request,

			HttpServletResponse response) {

		try{

			//request.setAttribute("pageinfo",postdao.pageSize());

			//String currpage=request.getParameter("currentPage");

			

			int currentPage=1;

			//if(currpage!=null){

			//	currentPage=Integer.parseInt(currpage);

			//}	

			List<Post> list = new ArrayList<Post>();

			list = postdao.findAllPost(currentPage);

			request.setAttribute