jsp基础--登录注册建立
搞了一个周，总算成功了，现分享给大家，请多指教！
所需软件：
myeclipse mysql数据库, Navicat for MySQL（sqlyog可视化软件可替换Navicat for MySQL） Tomact7.x
①：首先创建一个WebService project，我命名是zuoye2
如图：
②：将驱动（我用的是mysql-connector-java-5.0.8-bin）复制到创建的WebService project中WebRoot--WEB-INF-lib目录下，如图：
③：新建包xxxx.model，，，，，，新建类，如user（在user类中写需要的方法，并同时写set与get方法）
代码如下：
<span style="font-size:18px;">package zuoye2.model;
public class user {
private int username;
private String password;
private String code;
public int getUsername()
{
return username;
}
public void setUsername(int username)
{
this.username = username;
}
public String getPassword()
{
return password;
}
public void setPassword(String password)
{
this.password = password;
}
public String getCode()
{
return code;
}
public void setCode()
{
this.code = code;
}
}</span>
④：新建包名 xxxx.util，，，，，新建类 如DBO(用于连接数据库)
代码如下：
package zuoye2.util;
import java.sql.Connection;
import java.sql.DriverManager;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.ResultSet;
import com.mysql.jdbc.Statement;
public class DBO {
protected final static String driver = "com.mysql.jdbc.Driver";
protected final static String url = "jdbc:mysql://localhost:3306/建立数据库的名称" ;
static {
try{
Class.forName(driver);//加载驱动程序
}catch(Exception e)
{
e.printStackTrace();
}
}
public static Connection getConnection ()
{
Connection conn = null;
try{
String password;
conn = (Connection)DriverManager.getConnection(url, “数据库用户名”，“数据库密码”);
}catch(Exception e)
{
e.printStackTrace();
}
return conn;
}
public static void close (Statement st,ResultSet rs,Connection conn)
{
try
{
if(st!=null)
{
st.close();
}
if(rs!=null)
{
rs.close();
}
if(conn!=null)
{
conn.close();
}
}catch(Exception e)
{
e.printStackTrace();
}
}
public static void close(PreparedStatement pst,Connection conn)
{
try{
if(pst!=null)
{
pst.close();
}
if(conn!=null)
{
conn.close();
}
}catch(Exception e)
{
e.printStackTrace();
}
}
}⑤：新建包名 xxxx.service(用于写操作接口与实现接口的方法)，，，，新建接口，如userManager
（注意此处建的是接口Interface不是class），右击service包，点开新建，找到Interface，点击建立，命名userManager，代码如下：
package zuoye2.service;
import zuoye2.model.user;
public interface userManger {
public boolean add(user u);
public boolean addm(int username,String password);
}⑥：在
xxxx.service包中新建类，如userManagerImpl(此类用于实现userManager接口中定义的方法)。
代码如下：
package zuoye2.service;
import java.sql.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.ResultSet;
import com.mysql.jdbc.Statement;
import com.sun.tools.xjc.reader.xmlschema.bindinfo.BIConversion.User;
import zuoye2.model.user;
import zuoye2.util.DBO;
public class userMangerImpl implements userManger{
public boolean add(user u){
boolean flag = false;
Connection conn = null;
PreparedStatement pst = null;
try{
conn = DBO.getConnection();
String sql = "insert into a (username,password,code) value(1,22,333)";
pst=(PreparedStatement )conn.prepareStatement(sql);
pst.setInt(1, u.getUsername());
pst.setString(2,u.getPassword());
pst.setString(3, u.getCode());
int row = pst.executeUpdate();
if(row>0)
{
flag = true;
}
}
catch(Exception e)
{
e.printStackTrace();
}finally{
DBO.close(pst,conn);
}
return false;
}
public boolean addm (int username,String password)
{
boolean flag = false;
Connection conn = null;
Statement st = null;
ResultSet rs = null;
try{
conn = DBO.getConnection();
String sql = "select * from a where username="+username;
st = (Statement) conn.createStatement();
rs = (ResultSet) st.executeQuery(sql);
while(rs.next())
{
if(rs.getString("password").equals(password));
{
flag = true;
}
}
}catch(Exception e)
{
e.printStackTrace();
}finally{
DBO.close(st,rs,conn);
}
return false;
}
}
⑦：建立JSP页面,右点击WebRoot，新建JSP（Advaanced Templates）
（PS :软件在新建工程时默认第一个JSP页面是index.jsp，),注意：在JSP页面中登录页面代码：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<from action="addm" method="post" align="center">
<center><h1>网页登陆</h1></center>
<center><b>用户名:</b><input type ="password" name="Username" style="width: 193px; "><br>
<p></p>
<b>密 码:</b><input type="password" name="Password" style="width: 193px; "><br>
<br/>
<font size="+1">
<p>
<input name="submit" type="submit" class="button" style="width:200px; height:35px " value="登录" />
</p>
<p>
<font size="-1" color="#000099"><a href="zhuce.jsp">注册</a> </font> </p>
</font>
</center>
</from>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'zhuce.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<h1 align="center">新用户注册</h1>
<hr/>
<from action="add method="post" ><center>
<b>用户名:</b><input name="Username" type="text" style="width: 193px"><br/>
<p></p>
<b>密 码:</b><input name="Password" type="password" style="width: 193px; "/><br/>
<p></p>
<b>验证码:</b><input name="Code" type="text" style="width:193px;"><br/>
<p></p>
<input type="submit" style="width:180px; height:35px "value="注册" target="0"/> <br/>
</form>
<br/>
<a href="index.jsp">返回 </a>
</center>
</body>
</html>
⑧：在JSP页面中，可在<body></body>中写form表单
<form action="xxxx"method="post" >，可参考步骤⑦中代码，
附xxx是对应的后台程序的servlet，名字要相同，否则表单数据无法提交到servlet中。
⑨：新建包xxx.servlet，，，，，新建与操作相对应的servlet如添加add，addm，
注意此处新建的文件名字是 servlet 不是class，servlet用于接收from表单中传来的数据。
建立方法：右点击包xxx.servlet，新建目录下，点击Servlet，可建立两个，一个命名add，一个命名addm,
add代码：
package zuoye2.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import zuoye2.model.user;
import zuoye2.service.userManger;
import zuoye2.service.userMangerImpl;
public class add extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
int username = Integer.parseInt(request.getParameter("Username"));
String pswd = request.getParameter("Password");
String code = request.getParameter("Code");
userManger um =new userMangerImpl();
user u = new user();
u.setUsername(username);
u.setPassword(pswd);
u.setCode();
boolean flag= false;
try {
flag = um.add(u);
if(flag==true){
response.sendRedirect("index.jsp");
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
addm代码：
package zuoye2.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import zuoye2.model.user;
import zuoye2.service.userMangerImpl;
public class addm extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
int un = Integer.parseInt(request.getParameter("Username"));
String pswd = request.getParameter("Password");
String checkcode = request.getParameter("Checkcode");
String pickcode = (String) request.getSession().getAttribute("piccode");
userMangerImpl um = new userMangerImpl();
user u = new user();
boolean flag= false;
try {
flag = um.addm(un, pswd);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
if(flag&&checkcode.equals(pickcode)){
response.sendRedirect("logchegngong.jsp");
}
}
}
⑩：到此所有代码结束，接下来是运行，右点击创建的
WebService project，在此目录下找到Run As--MyEclipse Server Application，会弹出这个出口
选择Tomcat7.x，点击OK，运行！
另外，数据库连接代码，及测试类代码，博客空间里有，在这里就不多陈述了
最后，给大家分享一点体会，做这个一定要有耐心，也要足够的细心，我在写的时候，好几次导入包的时候，都导错了，造成很大麻烦，还好有人指导，