1.这次主要是针对portlet编程，首先建立java类TestDataPortlet extends GenericPortlet，重写doView、processAction、init和destroy。代码如下所示：
package com.tortrend.portlet;
import java.io.IOException;
import java.util.List;
import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.EventRequest;
import javax.portlet.EventResponse;
import javax.portlet.GenericPortlet;
import javax.portlet.PortletConfig;
import javax.portlet.PortletException;
import javax.portlet.PortletRequestDispatcher;
import javax.portlet.PortletSession;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.WindowState;
import com.tortrend.general.TestDataBean;
import com.tortrend.general.TestDataDAOImpl;
public class TestDataPortlet extends GenericPortlet {
private static final String NORMAL_VIEW = "/test/normal.jsp";
private static final String MAXIMIZED_VIEW = "/test/maximized.jsp";
private static final String HELP_VIEW = "/test/help.jsp";
private PortletRequestDispatcher normalView;
private PortletRequestDispatcher maximizedView;
private PortletRequestDispatcher helpView;
protected void doView(RenderRequest request, RenderResponse response)
throws PortletException, IOException {
System.out.println("testdataportlet doView ...");
PortletSession session = request.getPortletSession();
if ("delete".equals(request.getParameter("actionflag"))) {
int id = Integer.parseInt(request.getParameter("id"));
TestDataDAOImpl.delete(id);
System.out.println("testdataportlet doView delete");
} else if("adduser".equals(request.getParameter("actionflag"))) {
int id = TestDataDAOImpl.getCount() + 1;
TestDataBean tdb = new TestDataBean();
tdb.setId(id);
tdb.setName("wgj" + id);
tdb.setPassword("123");
TestDataDAOImpl.add(tdb);
System.out.println("testdataportlet doView add");
} else if("update".equals(request.getParameter("actionflag"))) {
int id = Integer.parseInt(request.getParameter("id"));
TestDataDAOImpl.update(id);
session.removeAttribute("test.list");
System.out.println("testdataportlet doView update");
}
int curp = request.getParameter("curp") != null ? Integer.parseInt(request.getParameter("curp")):1;
int pagesize = 5;
int totalNum = TestDataDAOImpl.getCount();
int totalPage = (totalNum + pagesize - 1 ) / pagesize;
List<TestDataBean> list = TestDataDAOImpl.getSome(curp, pagesize);
session.setAttribute("test.list", list);
session.setAttribute("test.curp", curp);
session.setAttribute("test.totalPage", totalPage);
if (WindowState.MINIMIZED.equals(request.getWindowState())) {
return;
}
if (WindowState.NORMAL.equals(request.getWindowState())) {
normalView.include(request, response);
} else {
maximizedView.include(request, response);
}
}
public void processAction(ActionRequest request, ActionResponse arg1)
throws PortletException, IOException {
if("Submit".equals(request.getParameter("actionflag"))) {
//System.out.println("testdataportlet processAction checklogin");
PortletSession session = request.getPortletSession();
String name = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("name=" + name);
System.out.println("password=" + password);
if(TestDataDAOImpl.checkLogin(name, password)) {
session.setAttribute("test.username", name);
List<TestDataBean> list = TestDataDAOImpl.getAll();
session.setAttribute("test.list", list);
//System.out.println("testdataportlet processAction checklogin success");
} else {
session.setAttribute("test.username", null);
//System.out.println("testdataportlet processAction checklogin failure");
}
} else if ("delete".equals(request.getParameter("actionflag"))) {
int id = Integer.parseInt(request.getParameter("id"));
TestDataDAOImpl.delete(id);
System.out.println("testdataportlet processAction delete");
}
}
public void init(PortletConfig config) throws PortletException {
super.init(config);
normalView = config.getPortletContext().getRequestDispatcher(
NORMAL_VIEW);
maximizedView = config.getPortletContext().getRequestDispatcher(
MAXIMIZED_VIEW);
helpView = config.getPortletContext().getRequestDispatcher(HELP_VIEW);
}
public void destroy() {
normalView = null;
maximizedView = null;
helpView = null;
super.destroy();
}
}
2.所对应的jsp代码如下：
<%@ page session="false" import="java.util.*,javax.portlet.*,com.tortrend.general.*" %>
<%@taglib uri="http://java.sun.com/portlet" prefix="portlet" %>
<portlet:defineObjects/>
<%
PortletSession session = renderRequest.getPortletSession();
String username = (String)session.getAttribute("test.username");
List<TestDataBean> list = (List<TestDataBean>)session.getAttribute("test.list");
int curp = (Integer)session.getAttribute("test.curp");
int totalPage = (Integer)session.getAttribute("test.totalPage");
int lastPage = curp - 1;
int nextPage = curp + 1;
//System.out.println("username=" + username);
%>
<DIV style="margin: 12px; margin-bottom: 36px">
<%
if (username != null) {
%>
Hello <%=username %>.<br><span><a href="<portlet:renderURL>
<portlet:param name="actionflag" value="adduser"/>
</portlet:renderURL>">add user</a></span>
<% if(list.size() > 0) { %>
<table border="1" width="80%">
<% for(TestDataBean tdb : list) { %>
<tr>
<td width="60%"><a href="#"><%=tdb.getName() %></a></td>
<td width="50px;"><a href="<portlet:renderURL>
<portlet:param name="actionflag" value="update"/>
<portlet:param name="id" value="<%=String.valueOf(tdb.getId()) %>" />
</portlet:renderURL>">EDIT</a></td>
<td width="50px;"><a href="<portlet:renderURL>
<portlet:param name="actionflag" value="delete"/>
<portlet:param name="id" value="<%=String.valueOf(tdb.getId()) %>" />
</portlet:renderURL>">DELETE</a></td>
</tr>
<% } %>
</table>
<% if(curp > 1) { %>
<span><a href="<portlet:renderURL>
<portlet:param name="curp" value="<%=String.valueOf(lastPage) %>"/>
</portlet:renderURL>">last page</a></span>
<% } else { %>
<span>last page</span>
<% } %>
<% if(curp < totalPage) { %>
<span><a href="<portlet:renderURL>
<portlet:param name="curp" value="<%=String.valueOf(nextPage) %>"/>
</portlet:renderURL>">next page</a></span>
<% } else { %>
<span>next page</span>
<% } %>
<% } %>
<%
}
%>
<FORM method="POST" action="<portlet:actionURL/>">
<INPUT name="username" type="text"/><br>
<INPUT name="password" type="password"/><br>
<INPUT name="actionflag" type="submit" value="Submit"/>
</FORM>
</DIV>
3.数据库处理文件
package com.tortrend.general;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class TestDataDAOImpl {
private static String DRIVER = "org.gjt.mm.mysql.Driver";
private static String URL = "jdbc:mysql://127.0.0.1:3307/protal";
private static String USERNAME = "root";
private static String PASSWORD = "root";
private static Connection conn = null;
private static PreparedStatement pst = null;
private static ResultSet rs = null;
static {
try {
Class.forName(DRIVER);
conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
public static List<TestDataBean> getAll() {
List<TestDataBean> list = new ArrayList<TestDataBean>();
String sql = "select * from test_data";
try {
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
while(rs.next()) {
TestDataBean tdb = new TestDataBean();
tdb.setId(rs.getInt("id"));
tdb.setName(rs.getString("name"));
tdb.setPassword(rs.getString("password"));
list.add(tdb);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
rs.close();
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
public static List<TestDataBean> getSome(int page, int pagesize) {
List<TestDataBean> list = new ArrayList<TestDataBean>();
String sql = "select * from test_data order by id limit ?,?";
try {
pst = conn.prepareStatement(sql);
pst.setInt(1, (page - 1) * pagesize);
pst.setInt(2, pagesize);
rs = pst.executeQuery();
while(rs.next()) {
TestDataBean tdb = new TestDataBean();
tdb.setId(rs.getInt("id"));
tdb.setName(rs.getString("name"));
tdb.setPassword(rs.getString("password"));
list.add(tdb);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
rs.close();
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
public static boolean checkLogin(String name, String password) {
boolean flag = false;
String sql = "select name from test_data where name = ? and password = ?";
try {
pst = conn.prepareStatement(sql);
pst.setString(1, name);
pst.setString(2, password);
rs = pst.executeQuery();
if(rs.next()) {
flag = true;
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
rs.close();
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return flag;
}
public static int getCount() {
String sql = "select count(*) num from test_data";
try {
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
if(rs.next()) {
return rs.getInt("num");
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
rs.close();
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return 0;
}
public static void add(TestDataBean tdb) {
String sql = "insert into test_data values(?, ?, ?)";
try {
pst = conn.prepareStatement(sql);
pst.setInt(1, tdb.getId());
pst.setString(2, tdb.getName());
pst.setString(3, tdb.getPassword());
pst.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void update(int id) {
String sql = "update test_data set name = ? where id = ?";
try {
pst = conn.prepareStatement(sql);
pst.setString(1, "wgj-update");
pst.setInt(2, id);
pst.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void delete(int id) {
String sql = "delete from test_data where id = ?";
try {
pst = conn.prepareStatement(sql);
pst.setInt(1, id);
pst.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
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