9.指导学习

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Java 粗浅

create table NEWS
(
  ID         INTEGER not null,
  TITLE      VARCHAR2(50),
  AUTHOR     VARCHAR2(12),
  CREATETIME DATE,
  CONTENT    VARCHAR2(2000)
)

insert into NEWS (ID, TITLE, AUTHOR, CREATETIME, CONTENT)
values (1, 'title1', 'author1', to_date('14-06-2010', 'dd-mm-yyyy'), 'content1');
insert into NEWS (ID, TITLE, AUTHOR, CREATETIME, CONTENT)
values (2, 'title2', 'author2', to_date('21-06-2010', 'dd-mm-yyyy'), 'content2');
insert into NEWS (ID, TITLE, AUTHOR, CREATETIME, CONTENT)
values (3, 'title3', 'author3', to_date('23-06-2010', 'dd-mm-yyyy'), '内容3');
commit;

entity:

package cn.jbit.entity;

import java.util.Date;

public class News {
	// 新闻标识符
	private int id; 
	// 新闻标题
	private String title;
	// 新闻作者
	private String author; 
	// 新闻创建时间
	private Date createTime; 
	// 新闻内容
	private String content; 

	/**
	 * 构造方法
	 */
	public News() {
	}
	public News(int id, String title, String author, Date createTime,
			String content) {
		this.setId(id);
		this.setTitle(title);
		this.setAuthor(author);
		this.setCreateTime(createTime);
		this.setContent(content);
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public String getAuthor() {
		return author;
	}
	public void setAuthor(String author) {
		this.author = author;
	}
	public Date getCreateTime() {
		return createTime;
	}
	public void setCreateTime(Date createTime) {
		this.createTime = createTime;
	}
	public String getContent() {
		return content;
	}
	public void setContent(String content) {
		this.content = content;
	}
}

dao:

package cn.jbit.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class BaseDao {
	// 数据库驱动字符串
	private static String driver = "oracle.jdbc.driver.OracleDriver";
	// 连接URL字符串
	private static String url = "jdbc:oracle:thin:@localhost:1521:oracle10";
	// 数据库用户名
	private static String user = "news";
	// 用户密码
	private static String password = "accp";

	/**
	 * 获取数据库连接对象
	 */
	public Connection getConnection() {
		Connection conn = null; // 数据连接对象

		// 获取连接并捕获异常
		try {
			// 加载驱动
			Class.forName(driver);
			// 获取数据库连接
			conn = DriverManager.getConnection(url, user, password);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn; // 返回数据连接对象
	}

	/**
	 * 关闭数据库连接
	 */
	public void closeAll(Connection conn, PreparedStatement pstmt, ResultSet rs) {
		// 若结果集对象不为空，则关闭
		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

		// 若PreparedStatement对象不为空，则关闭
		if (pstmt != null) {
			try {
				pstmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

		// 若数据库连接对象不为空，则关闭
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 执行更新、删除、插入SQL语句命令
	 */
	public int executeUpdate(String sql, Object[] pars) {
		int rowCount = 0;
		Connection conn = null;
		PreparedStatement pstmt = null;
		try {
			// 连接数据库
			conn = this.getConnection();
			// 创建数据库命令对象
			pstmt = conn.prepareStatement(sql);
			if (pars != null) {
				for (int i = 0; i < pars.length; i++) {
					pstmt.setObject(i + 1, pars[i]);
				}
			}
			// 执行数据库命令
			rowCount = pstmt.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return rowCount;
	}
}

package cn.jbit.dao;

import java.util.List;

import cn.jbit.entity.News;

public interface NewsDao {
	/**
	 * 对News进行查询操作
	 */
	List<News> executeQuery(String sql, Object[] pars);

	/**
	 * 对News进行增、删、改操作
	 */
	int executeUpdate(String sql, Object[] pars);
}

实现dao:

package cn.jbit.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import cn.jbit.dao.BaseDao;
import cn.jbit.dao.NewsDao;
import cn.jbit.entity.News;

public class NewsDaoOraleImpl extends BaseDao implements NewsDao {
	Connection conn = null; 
	PreparedStatement pstmt = null;
	ResultSet rs = null; 

	/**
	 * 查询所有新闻信息
	 */
	public List<News> executeQuery(String sql, Object[] param) {
		// 创建一个泛型集合对象
		List<News> newLists = new ArrayList<News>();
		try {
			// 获取数据库连接对象
			conn = super.getConnection();
			// 创建数据库命令对象
			pstmt = conn.prepareStatement(sql);
			if (param != null) {
				for (int i = 0; i < param.length; i++) {
					pstmt.setObject((i + 1), param[i]);
				}
			}
			// 执行数据库命令
			rs = pstmt.executeQuery();
			// 处理结果
			while (rs.next()) {
				// 创建一个新闻对象
				News news = new News();
				news.setId(rs.getInt(1));
				news.setTitle(rs.getString(2));
				news.setAuthor(rs.getString(3));
				news.setCreateTime(rs.getDate(4));
				news.setContent(rs.getString(5));
				// 把数据添加到集合中
				newLists.add(news);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			// 调用关闭数据库连接
			super.closeAll(conn, pstmt, rs);
		}

		return newLists;
	}
}

mondel:

package cn.jbit.mondel;

import java.util.List;

import cn.jbit.dao.NewsDao;
import cn.jbit.dao.impl.NewsDaoOraleImpl;
import cn.jbit.entity.News;
import cn.jbit.tool.FileIO;



/**
 * 使用数据库内容替换模板文件，生成HTML文件
 * */
public class NewsManager {
	public void toHtml() {
		// 读取模板文件内容
		FileIO fileIO = new FileIO();
		String templates = fileIO.readFile("contentCMS.template");
		// 读取数据库表
		NewsDao newsDao = new NewsDaoOraleImpl();
		String sql = "select * from news";
		List<News> list = newsDao.executeQuery(sql, null);
		// 替换模板文件
		for (int i = 0; i < list.size(); i++) {
			// 获取一条新闻
			News news = list.get(i);
			// 使用该条新闻信息替换对应占位符
			String replace = new String();
			replace = templates;
			replace = replace.replace("{title}", news.getTitle())
					.replace("{author}", news.getAuthor())
					.replace("{createTime}", news.getCreateTime().toString())
					.replace("{content}", news.getContent());
			String path = "news" + i + ".html";
			fileIO.writeFile(path, replace);
		}
	}
}

tool:

package cn.jbit.tool;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;

/**
 * 文件流
 * */
public class FileIO {
	/**
	 * 读取文件
	 * */
	public String readFile(String path) {
		StringBuffer sbf = new StringBuffer();
		Reader reader = null;
		char[] ch = new char[1024];
		// 读取模板文件内空到StringBuffer中
		try {
			reader = new InputStreamReader(new FileInputStream(path),
					Charset.forName("UTF-8"));
			while (reader.read(ch) != -1) {
				sbf.append(ch);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {// 关闭读取器
				if (reader != null) {
					reader.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return sbf.toString();
	}

	/**
	 * 写入文件
	 */
	public void writeFile(String path, String content) {
		Writer writer = null; // 写入流
		try {
			writer = new OutputStreamWriter(new FileOutputStream(path),
					Charset.forName("UTF-8"));
			writer.write(content);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {// 关闭写入流
				if (writer != null) {
					writer.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}
}

test:

package cn.jbit.test;

import cn.jbit.mondel.NewsManager;

public class Test {
	public static void main(String[] args) {
		//创建对象
		NewsManager newsMan=new NewsManager();
		// 调用方法
		newsMan.toHtml();
	}
}