From b162941efd59456b8b2c0af4bd7c8707663d2891 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E5=BF=97=E4=BC=9F?= <2152890632@qq.com>
Date: Thu, 25 May 2023 13:20:08 +0800
Subject: [PATCH] =?UTF-8?q?tomcat=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...0230524 tomcat\344\275\234\344\270\232.md" | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 "06 \351\231\210\345\277\227\344\274\237/20230524 tomcat\344\275\234\344\270\232.md"

diff --git "a/06 \351\231\210\345\277\227\344\274\237/20230524 tomcat\344\275\234\344\270\232.md" "b/06 \351\231\210\345\277\227\344\274\237/20230524 tomcat\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..a410811
--- /dev/null
+++ "b/06 \351\231\210\345\277\227\344\274\237/20230524 tomcat\344\275\234\344\270\232.md"	
@@ -0,0 +1,99 @@
+```java
+package Allt;
+
+import java.sql.*;
+
+public class All {
+    private static final String url = "jdbc:mysql:///user?useSSL=false&useUnicode=true&characterEncoding=utf8";
+    private static final String user = "root";
+    private static final String password = "root";
+
+    static {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动注册异常");
+            e.printStackTrace();
+        }
+    }
+
+    public static Connection getConn() {
+        Connection conn = null;
+        try {
+            conn = DriverManager.getConnection(url, user, password);
+        } catch (SQLException e) {
+            System.out.println("获取连接对象失败");
+            e.printStackTrace();
+        }
+        return conn;
+    }
+
+    public static ResultSet query(String sql, String... keys) {
+        ResultSet rs = null;
+        try {
+            Connection conn = getConn();
+            PreparedStatement pst = conn.prepareStatement(sql);
+            for (int i = 0; i < keys.length; i++) {
+                pst.setString((i + 1), keys[i]);
+            }
+            rs = pst.executeQuery();
+        } catch (SQLException e) {
+            System.out.println("执行查询异常");
+            e.printStackTrace();
+        }
+        return rs;
+    }
+}
+```
+
+```java
+package servlet;
+
+import Allt.All;
+
+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("/test")
+public class StudentServlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("text/html;charset=utf-8");
+        resp.setCharacterEncoding("utf-8");
+        System.out.println("发送值");
+        PrintWriter out = resp.getWriter();
+        out.write("输出了一个值");
+        String sql = "select * from biao";
+        ResultSet rst = All.query(sql);
+        out.write("<table border=1>");
+        out.write("<tr>" +
+                "<th>编号</th><th>姓名</th><th>性别</th>" +
+                "</tr>");
+        try {
+            while (rst.next()) {
+                int id = rst.getInt("id");
+                String name = rst.getString("name");
+                String sex = rst.getString("sex");
+                out.write("<tr><td>" + id + "</td><td>" + name + "</td><td>" + sex + "</td></tr>");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        out.write("</table>");
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+
+```
+
-- 
Gitee