From ef83e52b3249783a557896730708d037ea09e281 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=99=88=E6=98=8E=E5=87=BD?= <3084917167@qq.com> Date: Mon, 22 May 2023 14:20:42 +0000 Subject: [PATCH 1/3] =?UTF-8?q?=E6=96=B0=E5=BB=BA=2002=20=E9=99=88?= =?UTF-8?q?=E6=98=8E=E5=87=BD?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- "02 \351\231\210\346\230\216\345\207\275/.keep" | 0 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 "02 \351\231\210\346\230\216\345\207\275/.keep" diff --git "a/02 \351\231\210\346\230\216\345\207\275/.keep" "b/02 \351\231\210\346\230\216\345\207\275/.keep" new file mode 100644 index 0000000..e69de29 -- Gitee From d180d5f563c550a880496451d6ea5f412ba43980 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=99=88=E6=98=8E=E5=87=BD?= <3084917167@qq.com> Date: Mon, 22 May 2023 14:22:43 +0000 Subject: [PATCH 2/3] =?UTF-8?q?02=20=E9=99=88=E6=98=8E=E5=87=BD?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 陈明函 <3084917167@qq.com> --- .../20230519 jsp\344\275\234\344\270\232.md" | 0 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 "02 \351\231\210\346\230\216\345\207\275/20230519 jsp\344\275\234\344\270\232.md" diff --git "a/02 \351\231\210\346\230\216\345\207\275/20230519 jsp\344\275\234\344\270\232.md" "b/02 \351\231\210\346\230\216\345\207\275/20230519 jsp\344\275\234\344\270\232.md" new file mode 100644 index 0000000..e69de29 -- Gitee From 50dbe53fd2b46cdb997f4702334b41caec2073e4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=99=88=E6=98=8E=E5=87=BD?= <3084917167@qq.com> Date: Thu, 25 May 2023 02:18:27 +0000 Subject: [PATCH 3/3] =?UTF-8?q?02=20=E9=99=88=E6=98=8E=E5=87=BD?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 陈明函 <3084917167@qq.com> --- .../0525\344\275\234\344\270\232.md" | 199 ++++++++++++++++++ 1 file changed, 199 insertions(+) create mode 100644 "02 \351\231\210\346\230\216\345\207\275/0525\344\275\234\344\270\232.md" diff --git "a/02 \351\231\210\346\230\216\345\207\275/0525\344\275\234\344\270\232.md" "b/02 \351\231\210\346\230\216\345\207\275/0525\344\275\234\344\270\232.md" new file mode 100644 index 0000000..bb9c6fa --- /dev/null +++ "b/02 \351\231\210\346\230\216\345\207\275/0525\344\275\234\344\270\232.md" @@ -0,0 +1,199 @@ +````java +package servle; + +import until.Text; + +import javax.servlet.ServletException; +import javax.servlet.annotation.WebServlet; +import javax.servlet.http.HttpServlet; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; +import java.io.IOException; +import java.io.PrintWriter; +import java.sql.ResultSet; +import java.sql.SQLException; + +@WebServlet("/Text") + +public class SS extends HttpServlet { + + @Override + protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + System.out.println("这是我数出语句"); + resp.setContentType("Text/html;charset=utf-8"); + PrintWriter out = resp.getWriter(); + out.write("你接受到了一条消息"); + out.write(""); + out.write(""); + //查询 + String sql="select * from studnet"; + ResultSet qure = Text.qure(sql); + try { + while (qure.next()){ + int id = qure.getInt("id"); + String name = qure.getString("name"); + String sex = qure.getString("sex"); + out.write(""+""+""); + } + } catch (SQLException e) { + throw new RuntimeException(e); + } + out.write("
编号姓名性别
"+id+""+name+""+sex+"
"); + //增添 +// String sql1="insert into studnet value(10，'牛蚊疯','妖魔鬼怪大傻叉')"; +// try { +// int insert = Text.insert(sql1); +// out.write("添加成功！"); +// } catch (Exception e) { +// out.write("添加失败！"); +// } + //修改 +// String sql2="update studnet set name='刘文峰' where id=10"; +// try { +// int update = Text.insert(sql2); +// out.write("修改成功！"); +// } catch (Exception e) { +// out.write("修改失败！"); +// } + //删除 +// String sql3="delete from studnet where id=1"; +// try { +// int delete = Text.delete(sql3); +// out.write("删除成功"); +// } catch (Exception e) { +// out.write("删除成功"); +// } + } + + @Override + protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + super.doPost(req, resp); + } +} + +``` + +## Text + +``` java +package until; + +import java.sql.*; + +public class Text { + private static final String url="jdbc:mysql:///aaa?useSSL=false&useUnicode=true&characterEncoding=utf8"; + private static final String username="root"; + private static final String password="root"; + static{ + try { + Class.forName("com.mysql.jdbc.Driver"); + } catch (ClassNotFoundException e) { + System.out.println("驱动包异常请检查"); + } + } + public static Connection getcon() { + Connection con = null; + try { + con = DriverManager.getConnection(url, username, password); + } catch (SQLException e) { + System.out.println("连接异常'"); + } + return con; + } + public static Connection conget(){ + Connection con = null; + try { + con = DriverManager.getConnection(url, username, password); + } catch (SQLException e) { + System.out.println("连接异常"); + } + return con; + } + public static ResultSet qure(String sql, String...keys) {//查询 + ResultSet res = null; + try { + Connection con = conget(); + PreparedStatement pre = con.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pre.setString((i+1),keys[i]); + } + res = pre.executeQuery(); + } catch (SQLException e) { + throw new RuntimeException(e); + } + return res; + } + public static int insert(String sql,String...keys) {//添加 + int num = 0; + PreparedStatement pre = null; + try { + Connection con = conget(); + pre = con.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pre.setString((i + 1), keys[i]); + } + num = pre.executeUpdate(); + + } catch (SQLException e) { + throw new RuntimeException(e); + } finally { + try { + pre.close(); + conget().close(); + } catch (SQLException e) { + throw new RuntimeException(e); + } + } + return num; + } + public static int update(String sql,String...keys) {//修改 + int num = 0; + PreparedStatement pre = null; + try { + Connection con = conget(); + pre = con.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pre.setString((i + 1), keys[i]); + } + num = pre.executeUpdate(); + pre.close(); + conget().close(); + } catch (SQLException e) { + throw new RuntimeException(e); + } finally { + try { + pre.close(); + conget().close(); + } catch (SQLException e) { + throw new RuntimeException(e); + } + } + return num; + } + public static int delete(String sql,String...keys) {//删除 + int num = 0; + PreparedStatement pre = null; + try { + Connection con = conget(); + pre = con.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pre.setString((i + 1), keys[i]); + } + num = pre.executeUpdate(); + + } catch (SQLException e) { + throw new RuntimeException(e); + } finally { + try { + pre.close(); + conget().close(); + } catch (SQLException e) { + throw new RuntimeException(e); + } + } + + return num; + } +} +```` + -- Gitee