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+# 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？
+
+```java
+package servlet;
+
+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.*;
+
+@WebServlet("/stu")
+public class StudentServlet extends HttpServlet{
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        try {
+            resp.setContentType("text/html;charset=utf-8");// 设置网页的格式
+            resp.setCharacterEncoding("utf-8");// 设置网页的编码
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8","root","root");
+            String sql= "SELECT * FROM student";
+            PreparedStatement pst = conn.prepareStatement(sql);
+            ResultSet rs = pst.executeQuery();
+            while (rs.next()){
+                int id =rs.getInt("id");
+                String name= rs.getString("name");
+                String sex= rs.getString("sex");
+                System.out.println(id+name+sex);
+                resp.getWriter().write(id+name+sex);
+            }
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+```java
+package servlet;
+
+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.*;
+
+@WebServlet("/stui")
+public class Stu extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        try {
+            resp.setContentType("text/html;charset=utf-8");// 设置网页的格式
+            resp.setCharacterEncoding("utf-8");// 设置网页的编码
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8","root","root");
+            String sql= "INSERT  INTO student VALUES(1,'红','男')";
+            PreparedStatement pst = conn.prepareStatement(sql);
+            int i = pst.executeUpdate();
+            if(i>0){
+                System.out.println("成功");
+
+                resp.getWriter().write("成功");
+            }else {
+                System.out.println("失败");
+                resp.getWriter().write("失败");
+            }
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+```java
+package servlet;
+
+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.*;
+
+@WebServlet("/stui")
+public class Stu extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        try {
+            resp.setContentType("text/html;charset=utf-8");// 设置网页的格式
+            resp.setCharacterEncoding("utf-8");// 设置网页的编码
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8","root","root");
+            String sql= "UPDATE student set `name`='大红' WHERE id=1";
+            PreparedStatement pst = conn.prepareStatement(sql);
+            int i = pst.executeUpdate();
+            if(i>0){
+                System.out.println("成功");
+
+                resp.getWriter().write("成功");
+            }else {
+                System.out.println("失败");
+                resp.getWriter().write("失败");
+            }
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+```java
+package servlet;
+
+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.*;
+
+@WebServlet("/stui")
+public class Stu extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        try {
+            resp.setContentType("text/html;charset=utf-8");// 设置网页的格式
+            resp.setCharacterEncoding("utf-8");// 设置网页的编码
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8","root","root");
+            String sql= "DELETE FROM student WHERE id=2";
+            PreparedStatement pst = conn.prepareStatement(sql);
+            int i = pst.executeUpdate();
+            if(i>0){
+                System.out.println("成功");
+
+                resp.getWriter().write("成功");
+            }else {
+                System.out.println("失败");
+                resp.getWriter().write("失败");
+            }
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+}
+```
+
+```mysql
+CREATE DATABASE student_db charset utf8 ;
+use student_db;
+CREATE TABLE student(
+id int ,
+name VARCHAR(20),
+sex VARCHAR(20)
+);
+insert into student VALUES(1,"张三","男"),(2,"李四","女"),(3,"王五","男");
+SELECT * FROM student; 
+```
+