Struts自定義標簽--使用表格顯示數據

　　apptld

　　 <?xml version= encoding=UTF?>
<taglib>
 <tlibversion></tlibversion>
 <jspversion></jspversion>
 <tag>
  <name>display</name>
  <tagclass>comtestDisplayTag</tagclass>
  <bodycontent>empty</bodycontent>
  <attribute>
   <name>page</name>
   <required>true</required>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
 </tag>
</taglib>

　　DisplayTagjava

　　

　　package comtest;

　　import javautilList;

　　import javaxservletJspException;
import javaxservletjspJspTagException;
import javaxservletjspJspWriter;
import javaxservletjsptagextTagSupport;

　　import comtestHibernateUser;

　　public class DisplayTag extends TagSupport {

　　/**
  *
  */
 private static final long serialVersionUID = L;

　　private String name = alluser;
 
 private String page;
 
 public String getName() {
  return name;
 }

　　public void setName(String name) {
  thisname = name;
 }

　　public String getPage() {
  return page;
 }

　　public void setPage(String page) {
  thispage = page;
 }

　　private String test;
 
 public String getTest() {
  return test;
 }

　　public void setTest(String test) {
  thistest = test;
 }

　　@Override
 public int doStartTag() throws JspException {
  return SKIP_BODY;
 }

　　public int doEndTag() throws JspException {
  
  boolean valid = false;
  HttpSession session = pageContextgetSession();
  
  if (session != null && sessiongetAttribute(name) != null) {
   valid = true;
  } else {
   try {
    pageContextforward(page);
   } catch (Exception e) {
    // TODO: handle exception
    throw new JspException(etoString());
   }
  }
  
  JspWriter out = pageContextgetOut();
  try {
   List users = (List) sessiongetAttribute(alluser);
   if (valid) {
    outprintln(<table border=\\ width=% height=%>);
    outprintln(<tr>);
    outprintln(<th>ID</th>);
    outprintln(<th>Name</th>);
    outprintln(<th>password</th>);
    outprintln(</tr>);
    for (int i = ; i < userssize(); i++) {
     User user = (User) usersget(i);
     outprintln(<tr>);
     outprintln(<td> + usergetId() + </td>);
     outprintln(<td> + usergetUsername() + </td>);
     outprintln(<td> + usergetPassword() + </td>);
    }
    outprintln(</table>);
   } else {
    outprintln(null);
   }
  } catch (Exception e) {
   // TODO Autogenerated catch block
   throw new JspTagException(IOException: + etoString());
  }
  return SKIP_PAGE;
 }
 
 @Override
 public void release() {
  // TODO Autogenerated method stub
  superrelease();
  thisname = alluser;
  thispage = loginjsp;
 }
}

　　LoginActionjava

　　

　　package comteststrutsaction;

　　import javautilList;

　　import javaxservlethttpHttpServletRequest;
import javaxservlethttpHttpServletResponse;

　　import orgapachestrutsactionAction;
import orgapachestrutsactionActionForm;
import orgapachestrutsactionActionForward;
import orgapachestrutsactionActionMapping;
import orgapachestrutsvalidatorDynaValidatorForm;

　　import comtestHibernateUserDAO;

　　public class LoginAction extends Action {

　　private UserDAO userDao;

　　public UserDAO getUserDao() {
  return userDao;
 }

　　public void setUserDao(UserDAO userDao) {
  thisuserDao = userDao;
 }

　　public ActionForward execute(ActionMapping mapping ActionForm form HttpServletRequest request HttpServletResponse response) throws Exception {
  DynaValidatorForm loginForm = (DynaValidatorForm) form;
  String username = loginFormgetString(username);
  String password = loginFormgetString(password);
  if (userDaoisValidUser(username password)) {
   List users = userDaoshowAll();//在userDao中寫操作數據庫的方法其中showAll()方法是取出數據庫中說有數據
   requestsetAttribute(user username);
   requestgetSession()setAttribute(alluser users);
   return mappingfindForward(indexGo);
  } else {
   return mappinggetInputForward();
  }
 }
}

　　使用

　　

　　

　　<%@ taglib uri=/WEBINF/apptld prefix=app %>

　　

　　<app:display page=loginjsp/>

　　

From:http://tw.wingwit.com/Article/program/Java/ky/201311/28512.html