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+```markdown
+# 作业，
+ * 1 数据库相关的操作，使用封装的工具类
+ * 2 编写四个servlet，使用注解指定相关的访问路径，分别对应查询，修改，删除，添加的操作
+ * 3 从浏览器中，访问这中个路径，显示响应的信息，查询显示结果，其它的显示成功或是失败
+ * 4 预习题：如何通过浏览器传送请求参数给servlet，servlet如何接收这些参数，并使用这些参数，去影响数据库的操作？
+
+```
+
+工具类
+
+```java
+import java.sql.*;
+public class DbJbdc {
+    private static final String url="jdbc:mysql:///student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+    private static final String user="root";
+    private static final String pass="root";
+    public static Connection link() throws ClassNotFoundException, SQLException {
+        Class.forName("com.mysql.cj.jdbc.Driver");
+        Connection conn = DriverManager.getConnection(url, user, pass);
+        return conn;
+    }
+    public static int currencyUpdate(String sql,String ...flop) throws SQLException, ClassNotFoundException {
+        Connection conn = link();
+        PreparedStatement prs = conn.prepareStatement(sql);
+        for (int i = 0; i < flop.length; i++) {
+            prs.setString((i+1),flop[i]);
+        }
+        int i = prs.executeUpdate();
+        return i;
+    }
+    public static int delete(String sql,String ...flop) throws SQLException, ClassNotFoundException {
+        int i = currencyUpdate(sql, flop);
+        return i;
+    }
+    public static int modify(String sql,String ...flop) throws SQLException, ClassNotFoundException {
+        int i = currencyUpdate(sql, flop);
+        return i;
+    }
+    public static int add(String sql,String ...flop) throws SQLException, ClassNotFoundException {
+        int i = currencyUpdate(sql, flop);
+        return i;
+    }
+    public static ResultSet Query(String sql,String ...flop) throws SQLException, ClassNotFoundException {
+        Connection conn = link();
+        PreparedStatement prs = conn.prepareStatement(sql);
+        for (int i = 0; i < flop.length; i++) {
+            prs.setString((i+1),flop[i]);
+        }
+        ResultSet rs = prs.executeQuery();
+        return rs;
+    }
+}
+```
+
+查找
+
+```java
+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.sql.ResultSet;
+import java.sql.SQLException;
+@WebServlet("/seek")
+public class Seek extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("text/html;charset=utf-8");
+        resp.setCharacterEncoding("utf-8");
+        try {
+            String sql ="select * from student";
+            ResultSet rs = DbJbdc.Query(sql);
+            while (rs.next()){
+                int id = rs.getInt("id");
+                String name = rs.getString("name");
+                String sex = rs.getString("sex");
+                resp.getWriter().write(id+" "+name+" "+sex+"<br/>");
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+![/](tomcat\seek.png)
+
+添加
+
+```java
+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.sql.SQLException;
+@WebServlet("/add")
+public class Add extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("text/html;charset=utf-8");
+        resp.setCharacterEncoding("utf-8");
+        try {
+            String sql ="insert into student values (?,?,?)";
+            int add = DbJbdc.add(sql, "0", "小明", "男");
+            if (add>0){
+                resp.getWriter().write("成功");
+            }else {
+                resp.getWriter().write("失败");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+![](tomcat\add.png)
+
+删除
+
+```java
+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.sql.SQLException;
+@WebServlet("/delete")
+public class Delete extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("text/html;charset=utf-8");
+        resp.setCharacterEncoding("utf-8");
+        try {
+            String sql ="delete from student where id=?";
+            int add = DbJbdc.add(sql, "1");
+            if (add>0){
+                resp.getWriter().write("成功");
+            }else {
+                resp.getWriter().write("失败");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+![](tomcat\delete.png)
+
+修改
+
+```java
+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.sql.SQLException;
+@WebServlet("/modify")
+public class Modify extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("text/html;charset=utf-8");
+        resp.setCharacterEncoding("utf-8");
+        try {
+            String sql ="update student set sex=? where id=?";
+            int add = DbJbdc.add(sql, "女","2");
+            if (add>0){
+                resp.getWriter().write("成功");
+            }else {
+                resp.getWriter().write("失败");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+![](tomcat\modify.png)
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