标签：mvc java javascript jsp servet
第1步：安装Oracle数据库，安装过程不赘述了；
第2步：新建一个账号zwp_test
//创建临时表空间 create temporary tablespace zwp_test_temp tempfile 'F:\app\Administrator\oradata\zwp_test_temp.dbf' size 50m autoextend on next 50m maxsize 20480m extent management local; //创建数据表空间 create tablespace zwp_test_data logging datafile 'F:\app\Administrator\oradata\zwp_test_data.dbf' size 50m autoextend on next 50m maxsize 20480m extent management local; //创建用户 create user zwp_test identified by zwp_test default tablespace zwp_test_data temporary tablespace zwp_test_temp; //授予权限 grant connect,resource,dba to zwp_test;
第3步：新建一个users表
create table users ( userid varchar2(8) not null primary key , username varchar2(10) not null, password varchar2(20) default '' not null , age int default '' not null , sex varchar2(20) not null ) tablespace zwp_test_data;
第4步：插入数据
insert into users(userid,username,password,age,sex) values('001','zhouwp','123',25,'man');
第5步：搭建环境，我就不赘述了，可以百度、谷歌
功能说明：
做一个用户查询的功能
资源结构如下图：
第6步：显示界面JSP
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%@ page import="com.web.zwp.*" %>
<%@ page import="java.util.*" %>
<html>
<head>
<script type="text/javascript">
function checkAll(ifAll) {
//alert(ifAll.checked);
var selectFlags = document.getElementsByName("selectFlag");
for(var i=0;i<selectFlags.length;i++){
//selectFlag[i].checked=document.getElementById("ifAll").checked;
selectFlags[i].checked=ifAll.checked;
}
}
</script>
</head>
<body>
<form action="ShowUsers">
<table width="95%" border="1" cellspacing="0" cellpadding="0" align="center">
<input type="text" name="userid" id="userid" value=""/>
<input type="submit" value="查询">
<input name="btnAdd" type="button" class="button1" id="btnAdd" value="添加" onClick="addUser()">
<input name="btnModify" class="button1" type="button" id="btnModify" value="修改" onClick="modifyUser()">
<input name="btnDelete" class="button1" type="button" id="btnDelete" value="删除" onClick="deleteUser()">
<tr>
<td width="55" class="rd6">
<input type="checkbox" name="ifAll" id="ifAll" onClick="checkAll(this)">
</td>
<td>姓名</td>
<td>密码</td>
<td>年龄</td>
<td>性别</td>
</tr>
<%
User user = new User();
List<User> userList=(List<User>)request.getAttribute("userList");
if(userList != null && userList.size() > 0){
for(Iterator iter=userList.iterator();iter.hasNext();){
user=(User)iter.next();
}
%>
<tr>
<td width="55" class="rd6">
<input type="checkbox" name="ifAll" id="ifAll" onClick="checkAll(this)">
</td>
<td><%=user.getUserName()%></td>
<td><%=user.getPassWord()%></td>
<td><%=user.getAge()%></td>
<td><%=user.getSex()%></td>
</tr>
<%
}
%>
</table>
</form>
</body>
</html>
第7步：链接数据库
package com.web.db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DB {
private DB() {}
/**
* 取得Connection
* @return
*/
public static Connection getConnection() {
Connection conn = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:drp","zwp_test","zwp_test");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public static void close(PreparedStatement pstmt) {
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static void close(Connection conn) {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static void close(ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static void main(String[] args) {
DB.getConnection();
}
}
第8步：创建User对象类
package com.web.zwp;
public class User {
private String UserId;
private String UserName;
private String PassWord;
private int Age;
private String Sex;
public String getUserName() {
return UserName;
}
public void setUserName(String userName) {
UserName = userName;
}
public String getPassWord() {
return PassWord;
}
public void setPassWord(String passWord) {
PassWord = passWord;
}
public int getAge() {
return Age;
}
public void setAge(int age) {
Age = age;
}
public String getSex() {
return Sex;
}
public void setSex(String sex) {
Sex = sex;
}
public String getUserId() {
return UserId;
}
public void setUserId(String userId) {
UserId = userId;
}
}
第9步：新建一个用户管理类UserManager，类中实现查询方法
package com.web.zwp;
import java.sql.*;
import com.web.db.DB;
import com.web.zwp.User;
public class UserManager {
private static UserManager instance = new UserManager();
UserManager() {}
public static UserManager getInstance() {
return instance;
}
/*
*
* 查询所有
*/
public User findAllUser() {
String sql = "select * from users";
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
User user = null;
try {
conn = DB.getConnection();
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
if (rs.next()) {
user = new User();
user.setUserId(rs.getString("userid"));
user.setUserName(rs.getString("username"));
user.setPassWord(rs.getString("password"));
user.setAge(rs.getInt("age"));
user.setSex(rs.getString("sex"));
}
}catch(SQLException e) {
e.printStackTrace();
}finally {
DB.close(rs);
DB.close(pstmt);
DB.close(conn);
}
return user;
}
/*
* 按照ID查询
*/
public User findAllUserById(String userId) {
String sql = "select * from users where userid=?";
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
User user = null;
try {
conn = DB.getConnection();
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, userId);
rs = pstmt.executeQuery();
if (rs.next()) {
user = new User();
user.setUserId(rs.getString("userid"));
user.setUserName(rs.getString("username"));
user.setPassWord(rs.getString("password"));
user.setAge(rs.getInt("age"));
user.setSex(rs.getString("sex"));
}
}catch(SQLException e) {
e.printStackTrace();
}finally {
DB.close(rs);
DB.close(pstmt);
DB.close(conn);
}
return user;
}
}
第10步：通过HttpServet实现控制部分M
package com.web.zwp;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ShowUsers extends HttpServlet {
/**
*
*/
//private static final long serialVersionUID = 3434710866509057630L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String userid=request.getParameter("userid");
if(userid==null || userid.trim().length()==0)
{
User user=UserManager.getInstance().findAllUser();
List<User> userList = new ArrayList<User>();
userList.add(user);
request.setAttribute("userList", userList);
request.getRequestDispatcher("/ShowUsers.jsp").forward(request, response);
}
else
{
User user=UserManager.getInstance().findAllUserById(userid);
List<User> userList = new ArrayList<User>();
userList.add(user);
//从数据库中获取数据传给request对象中的userList属性，并转发到前台jsp
request.setAttribute("userList", userList);
request.getRequestDispatcher("/ShowUsers.jsp").forward(request, response);
}
}
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
}
最终显示界面样式：
标签：mvc java javascript jsp servet
原文地址：http://blog.csdn.net/davis_chou/article/details/41551479
