基於jsp的新聞釋出系統
阿新 • • 發佈：2019-01-29
其他的操作分別為增刪改查的具體程式碼，分別對應Servlet中或jsp中需要例項化的程式碼，下面就是具體的DAO類程式碼：
（2）首頁展示頁面的編寫，命名為index.html,由於可能有網路的延遲，我們使用漸進的方式跳轉（漸進方式跳轉：window.location.href="newRealese_brief.jsp"，從index.html頁面跳轉到NewRealese_brief.jsp頁面,其實這裡的跳轉功能使用的是JavaScript中的window物件進行跳轉的），程式碼如下所示：package dao; import com.lut.beans.NewsRealese; import static java.lang.System.out; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; public class NewsRealeseDao { public ArrayList queryAllNews() throws Exception { Connection conn = null; ArrayList newsRealese = new ArrayList(); try { //獲取連線 Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@localhost:1521:orcl"; conn = DriverManager.getConnection(url, "scott", "wjk139"); //執行SQL語句 String sql = "select * from newmessage";//獲取 Statement stat = conn.createStatement(); ResultSet rs = stat.executeQuery(sql); while (rs.next()) { //例項化VO NewsRealese news = new NewsRealese(); news.setNewsId(rs.getString("newsid")); news.setClassId(rs.getString("CLASSID")); news.setKindId(rs.getString("KINDID")); news.setMyOther(rs.getString("MYOTHER")); news.setHeadTitle(rs.getString("HEADTITLE")); news.setContent(rs.getString("CONTENT")); news.setConnectRealtive(rs.getString("CONNECTREALTIVE")); news.setAuthor(rs.getString("AUTHOR")); news.setEditor(rs.getString("EDITOR")); news.setNewsFrom(rs.getString("NEWSFROM")); news.setTop(rs.getString("TOP")); news.setNewsTime(rs.getString("NEWSTIME")); news.setHits(rs.getString("HITS")); news.setState(rs.getString("STATE")); news.setTag(rs.getString("TAG")); newsRealese.add(news); } rs.close(); stat.close(); } catch (Exception e1) { e1.printStackTrace(); } finally { try {//關閉連線 if (conn != null) { conn.close(); conn = null; } } catch (Exception ex) { } return newsRealese; } } //查詢一個訊息 public ArrayList queryOneNews(int newsid) throws Exception { Connection conn = null; ArrayList newsRealese = new ArrayList(); int temp_id = newsid; try { //獲取連線 Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@localhost:1521:orcl"; conn = DriverManager.getConnection(url, "scott", "wjk139"); //執行SQL語句 Statement stat = conn.createStatement(); String sql = "select * from newmessage where newsid=?";//獲取newsid，使用？代替字串，是一種預編譯的提交方式 PreparedStatement ps = conn.prepareStatement(sql); ps.setInt(1, Integer.valueOf(newsid)); ResultSet rs = ps.executeQuery();// 之前已經給了sql字串，所以executeQuery是無參的。 while (rs.next()) { //例項化VO NewsRealese news = new NewsRealese(); news.setNewsId(rs.getString("newsid")); news.setClassId(rs.getString("CLASSID")); news.setKindId(rs.getString("KINDID")); news.setMyOther(rs.getString("MYOTHER")); news.setHeadTitle(rs.getString("HEADTITLE")); news.setContent(rs.getString("CONTENT")); news.setConnectRealtive(rs.getString("CONNECTREALTIVE")); news.setAuthor(rs.getString("AUTHOR")); news.setEditor(rs.getString("EDITOR")); news.setNewsFrom(rs.getString("NEWSFROM")); news.setTop(rs.getString("TOP")); news.setNewsTime(rs.getString("NEWSTIME")); news.setHits(rs.getString("HITS")); news.setState(rs.getString("STATE")); news.setTag(rs.getString("TAG")); newsRealese.add(news); } rs.close(); stat.close(); } catch (Exception e1) { e1.printStackTrace(); } finally { try {//關閉連線 if (conn != null) { conn.close(); conn = null; } } catch (Exception ex) { } return newsRealese; } } //刪除資料 public String deleteOneNews(int newsid) throws Exception { Connection conn = null; ArrayList newsRealese = new ArrayList(); int temp_id = newsid; try { //獲取連線 Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@localhost:1521:orcl"; conn = DriverManager.getConnection(url, "scott", "wjk139"); //執行SQL語句 Statement stat = conn.createStatement(); String sql = "DELETE FROM newmessage WHERE newsid =?";//獲取newsid，使用？代替字串，是一種預編譯的提交方式 PreparedStatement ps = conn.prepareStatement(sql); ps.setInt(1, Integer.valueOf(newsid)); ResultSet rs = ps.executeQuery();// 之前已經給了sql字串，所以executeQuery是無參的。 rs.close(); stat.close(); } catch (Exception e1) { e1.printStackTrace(); } finally { try {//關閉連線 if (conn != null) { conn.close(); conn = null; } } catch (Exception ex) { } return newsRealese.toString(); } } //插入資料 public String insertOneNews(ArrayList addnews_list) throws Exception { Connection conn = null; /* for(int i=0,j=1;i<addnews_list.size();i++,j++) { System.out.println("j:"+j+"值："+addnews_list.get(i).toString()); }*/ try { //獲取連線 Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@localhost:1521:orcl"; conn = DriverManager.getConnection(url, "scott", "wjk139"); //執行SQL語句 Statement stat = conn.createStatement(); String sql = "insert into newmessage(newsId,classId,kindId,myOther,headTitle,content,connectRealtive,author,editor,newsFrom" + ",top,newsTime,hits,state,tag) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"; PreparedStatement ps = conn.prepareStatement(sql); ps.setInt(1, Integer.valueOf(addnews_list.get(0).toString())); ps.setInt(2, Integer.valueOf(addnews_list.get(1).toString())); ps.setInt(3, Integer.valueOf(addnews_list.get(2).toString())); ps.setInt(4, Integer.valueOf(addnews_list.get(3).toString())); ps.setString(5, addnews_list.get(4).toString()); ps.setString(6, addnews_list.get(5).toString()); ps.setString(7, addnews_list.get(6).toString()); ps.setString(8, addnews_list.get(7).toString()); ps.setString(9, addnews_list.get(8).toString()); ps.setString(10, addnews_list.get(9).toString()); ps.setInt(11, Integer.valueOf(addnews_list.get(10).toString())); ps.setString(12, addnews_list.get(11).toString()); ps.setString(13, addnews_list.get(12).toString()); ps.setString(14, addnews_list.get(13).toString()); ps.setString(15, addnews_list.get(14).toString()); for (int i = 0, j = 1; i < addnews_list.size(); i++, j++) { System.out.println("j:" + j + "值：" + addnews_list.get(i).toString()); } int i = ps.executeUpdate(); conn.commit(); System.out.println("成功新增" + i + "行"); stat.close(); conn.close(); return i + "conn:" + conn; } catch (Exception e1) { e1.printStackTrace(); } finally { try {//關閉連線 if (conn != null) { conn.close(); conn = null; } } catch (Exception ex) { } } return conn.toString(); } //更新資料 public String updateOneNews(ArrayList addnews_list) throws Exception { Connection conn = null; /* for(int i=0,j=1;i<addnews_list.size();i++,j++) { System.out.println("j:"+j+"值："+addnews_list.get(i).toString()); }*/ try { //獲取連線 Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@localhost:1521:orcl"; conn = DriverManager.getConnection(url, "scott", "wjk139");//不安全 //執行SQL語句 Statement stat = conn.createStatement(); String sql = "UPDATE newmessage set classId=?,kindId=?,myOther=?,headTitle=?,content=?," + "connectRealtive=?,author=?,editor=?,newsFrom=?,top=?,newsTime=?,hits=?,state=?,tag=? where newsid=?"; PreparedStatement ps = conn.prepareStatement(sql); ps.setInt(1, Integer.valueOf(addnews_list.get(1).toString())); ps.setInt(2, Integer.valueOf(addnews_list.get(2).toString())); ps.setInt(3, Integer.valueOf(addnews_list.get(3).toString())); ps.setString(4, addnews_list.get(4).toString()); ps.setString(5, addnews_list.get(5).toString()); ps.setString(6, addnews_list.get(6).toString()); ps.setString(7, addnews_list.get(7).toString()); ps.setString(8, addnews_list.get(8).toString()); ps.setString(9, addnews_list.get(9).toString()); ps.setInt(10, Integer.valueOf(addnews_list.get(10).toString())); ps.setString(11, addnews_list.get(11).toString()); ps.setString(12, addnews_list.get(12).toString()); ps.setString(13, addnews_list.get(13).toString()); ps.setString(14, addnews_list.get(14).toString()); ps.setInt(15, Integer.valueOf(addnews_list.get(0).toString())); for (int i = 0, j = 1; i < addnews_list.size(); i++, j++) { System.out.println("j:" + j + "值：" + addnews_list.get(i).toString()); } int i = ps.executeUpdate(); conn.commit(); System.out.println("成功更新" + i + "行"); stat.close(); conn.close(); return i + "conn:" + conn; } catch (Exception e1) { e1.printStackTrace(); } finally { try {//關閉連線 if (conn != null) { conn.close(); conn = null; } } catch (Exception ex) { } } return conn.toString(); } public String ischecked(String user, String pass) throws Exception { Connection conn = null; //獲取連線 Class.forName("oracle.jdbc.driver.OracleDriver"); String url = "jdbc:oracle:thin:@localhost:1521:orcl"; try { conn = DriverManager.getConnection(url,user, pass);//不安全 //建立連線 return conn.toString(); } catch (SQLException e) { e.printStackTrace(); } finally { if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } return null; } }