知识大全 Struts自定义标签--使用表格显示数据

Posted 2022-07-18 表格

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　　 app tld

　　 <?xml version= encoding= UTF ?><taglib> <tlib version> </tlib version> <jsp version> </jsp version> <tag> <name>display</name> <tagclass> test DisplayTag</tagclass> <bodycontent>empty</bodycontent> <attribute> <name>page</name> <required>true</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag></taglib>

　　 DisplayTag java

　　package test;

　　import java util List;

　　import javax servlet JspException;import javax servlet jsp JspTagException;import javax servlet jsp JspWriter;import javax servlet jsp tagext TagSupport;

　　import test Hibernate User;

　　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) this name = name;

　　public String getPage() return page;

　　public void setPage(String page) this page = page;

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

　　public void setTest(String test) this test = test;

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

　　public int doEndTag() throws JspException boolean valid = false; HttpSession session = pageContext getSession(); if (session != null && session getAttribute(name) != null) valid = true; else try pageContext forward(page); catch (Exception e) // TODO: handle exception throw new JspException(e toString()); JspWriter out = pageContext getOut(); try List users = (List) session getAttribute( alluser ); if (valid) out println( <table border=\\ \\ width= % height= % > ); out println( <tr> ); out println( <th>ID</th> ); out println( <th>Name</th> ); out println( <th>password</th> ); out println( </tr> ); for (int i = ; i < users size(); i++) User user = (User) users get(i); out println( <tr> ); out println( <td> + user getId() + </td> ); out println( <td> + user getUsername() + </td> ); out println( <td> + user getPassword() + </td> ); out println( </table> ); else out println( null ); catch (Exception e) // TODO Auto generated catch block throw new JspTagException( IOException: + e toString()); return SKIP_PAGE; @Override public void release() // TODO Auto generated method stub super release(); this name = alluser ; this page = login jsp ;

　　 LoginAction java

　　package test struts action;

　　import java util List;

　　import javax servlet HttpServletRequest;import javax servlet HttpServletResponse;

　　import apache struts action Action;import apache struts action ActionForm;import apache struts action ActionForward;import apache struts action ActionMapping;import apache struts validator DynaValidatorForm;

　　import test Hibernate UserDAO;

　　public class LoginAction extends Action

　　private UserDAO userDao;

　　public UserDAO getUserDao() return userDao;

　　public void setUserDao(UserDAO userDao) this userDao = userDao;

　　public ActionForward execute(ActionMapping mapping ActionForm form HttpServletRequest request HttpServletResponse response) throws Exception DynaValidatorForm loginForm = (DynaValidatorForm) form; String username = loginForm getString( username ); String password = loginForm getString( password ); if (userDao isValidUser(username password)) List users = userDao showAll();//在userDao中写操作数据库的方法其中 showAll()方法是取出数据库中说有数据 request setAttribute( user username); request getSession() setAttribute( alluser users); return mapping findForward( indexGo ); else return mapping getInputForward();

　　使用

　　<%@ taglib uri= /WEB INF/app tld prefix= app %>

　　<app:display page= login jsp />

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