MVC开发用户模块一

MVC.jpg

简单介绍下流程：浏览器发出请求，交给servlet，servlet收到请求后调用service组件进行处理，处理产生数据，数据从哪儿来，这里就调用dao,dao专门与数据库进行交互，数据一定要封装，在javabean组件中， servlet不适合作输出，转交给jsp,会把javabean存在域（request）里，jsp从request域里取出javabean的数据进行显示，将结果打给浏览器。

为了将来层与层之间进行维护，会在层与层之间定义接口，dao接口和service接口，service层对dao接口进行调用，dao层对dao接口进行实现，将来dao层换了，不影响service层。servlet接口也是一样的原理。

一、规划

>搭建开发环境
    1.1 导入开发包

    dom4j开发包
    jstl开发包
    beanUtils开发包
    log4j开发包    

    1.2 创建组织程序的包
        com.bird.domain
        com.bird.dao
        com.bird.dao.impl
        com.bird.service
        com.bird.service.impl
        com.bird.web.controller
        com.bird.web.ui
        com.bird.utils
        junit.test  
        WEB-INF/jsp保存所有jsp
    1.3 创建代表数据库的XML文件
        在类目录下创建一个代表数据库的XML文件     

二、充当数据库的user.xml

<?xml version="1.0" encoding="UTF-8"?>
<users>
    <user id="234343434" username="aaa" password="123" email="aa@sina.com" birthday="1900-09-18" nickname="强子" />
</users>

三、工具类的Dom4j用来解析XML文档

package cn.itcast.utils;

import java.io.File;
import java.io.FileOutputStream;

import org.dom4j.Document;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

//3
public class XmlUtils {
    private static String filePath;

    static {
        filePath = XmlUtils.class.getClassLoader().getResource("users.xml").getPath();
        filePath = filePath.replace("%20", " ");
    }

    public static Document getDocument() throws Exception {
        SAXReader reader = new SAXReader();
        Document document = reader.read(new File(filePath));
        return document;
    }

    public static void write2Xml(Document document) throws Exception {
        OutputFormat format = OutputFormat.createPrettyPrint();
        format.setEncoding("UTF-8");
        XMLWriter writer = new XMLWriter(new FileOutputStream(filePath), format);
        writer.write(document);
        writer.close();
    }

}

四、封装数据的JavaBean

package cn.itcast.domain;

import java.util.Date;

//1
public class User {

    private String id;
    private String username;
    private String password;
    private String email;
    private Date birthday;
    private String nickname;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }
}

五、Dao层实现的开发

package cn.itcast.dao.impl;

import java.text.SimpleDateFormat;

import org.dom4j.Document;
import org.dom4j.Element;

import cn.itcast.dao.UserDao;
import cn.itcast.domain.User;
import cn.itcast.utils.XmlUtils;

//2
public class UserDaoImpl implements UserDao {
    public void add(User user) {
        try {
            Document document = XmlUtils.getDocument();
            Element root = document.getRootElement();
            Element user_tag = root.addElement("user");
            user_tag.setAttributeValue("id", user.getId());
            user_tag.setAttributeValue("username", user.getUsername());
            user_tag.setAttributeValue("password", user.getPassword());
            user_tag.setAttributeValue("email", user.getEmail());
            user_tag.setAttributeValue("nickname", user.getNickname());
            user_tag.setAttributeValue("birthday", user.getBirthday() == null ? "" : user.getBirthday().toLocaleString());
            XmlUtils.write2Xml(document);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public User find(String username, String password) {

        try {
            Document document = XmlUtils.getDocument();
            Element e = (Element) document.selectSingleNode("//user[@username='" + username + "' and @password='" + password + "']");
            if (e == null)
                return null;
            User user = new User();
            user.setUsername(e.attributeValue("username"));
            user.setNickname(e.attributeValue("nickname"));
            user.setPassword(e.attributeValue("password"));
            user.setEmail(e.attributeValue("email"));
            user.setId(e.attributeValue("id"));
            String date = e.attributeValue("birthday");
            if (date == null || date.equals("")) {
                user.setBirthday(null);
            } else {
                SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
                user.setBirthday(df.parse(date));
            }
            return user;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    //查找注册的用户是否在数据库中存在
    public boolean find(String username) {
        try {
            Document document = XmlUtils.getDocument();
            Element e = (Element) document.selectSingleNode("//user[@username='" + username + "']");
            if (e == null)
                return false;
            return true;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

六、测试类

package junit.test;

import cn.itcast.dao.impl.UserDaoImpl;
import cn.itcast.domain.User;
import org.junit.Test;

import java.util.Date;

public class UserDaoTest {
    @Test
    public void testAdd() {
        User user = new User();
        user.setBirthday(new Date());
        user.setEmail("chenx@163.com");
        user.setId("333333333");
        user.setNickName("小静");
        user.setPasswWord("cxjcxj");
        user.setUserName("陈小镜");
        UserDaoImpl userDao = new UserDaoImpl();
        userDao.addUser(user);
    }

    @Test
    public void testFind() {
        User user = new User();
        UserDaoImpl userDao = new UserDaoImpl();
        userDao.findUser("陈小镜", "cxjcxj");
    }

    @Test
    public void testFindName() {
        UserDaoImpl dao = new UserDaoImpl();
        dao.findUser("陈小镜");
    }

}

biubiu

连下篇：http://www.jianshu.com/p/2121014cbaef
后面将会持续更新，敬请期待吧！！！