Android(安卓)Studio 实现实现学生信息的增删改查 -源代码 四（Servlet + 连接MySql数据库）
16lz
2022-01-08
| Android Studio 实现登录注册-源代码 （连接MySql数据库） | |
|---|---|
| Android Studio 实现登录注册-源代码 二（Servlet + 连接MySql数据库） | |
| [Android Studio 实现登录注册-源代码 三（Servlet + 连接MySql数据库）实现学生信息的查询 （JSON通信）] | |
| Android Studio 实现实现学生信息的增删改查 -源代码 四（Servlet + 连接MySql数据库） |
一、完善学生信息显示
1、修改和删除的按钮在student_list.xml当中
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="10dp" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal"> <TextView android:id="@+id/id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="id" /> <TextView android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="姓名" /> <TextView android:id="@+id/age" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="年龄" /> <TextView android:id="@+id/address" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="地址" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_weight="1" android:layout_gravity="right" android:orientation="horizontal"> <Button android:id="@+id/button" android:layout_width="70dp" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_gravity="right" android:layout_weight="1" android:textSize="15sp" android:text="修改" /> <Button android:id="@+id/button4" android:layout_width="70dp" android:layout_height="wrap_content" android:layout_gravity="right" android:layout_weight="1" android:textSize="15sp" android:text="删除" /> LinearLayout> LinearLayout>LinearLayout>2、添加表头的xml，创建list_header.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="10dp" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal"> <TextView android:id="@+id/id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="id" /> <TextView android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="姓名" /> <TextView android:id="@+id/age" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="年龄" /> <TextView android:id="@+id/address" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_weight="1" android:text="地址" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_weight="1" android:layout_gravity="right" android:orientation="horizontal"> <TextView android:id="@+id/button" android:layout_width="70dp" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_gravity="right" android:layout_weight="1" android:textSize="15sp" android:text="修改" /> <TextView android:id="@+id/button4" android:layout_width="70dp" android:layout_height="wrap_content" android:layout_gravity="right" android:layout_weight="1" android:textSize="15sp" android:text="删除" /> LinearLayout> LinearLayout>LinearLayout>3、在adapter当中动态加载表头
final LayoutInflater inflater = LayoutInflater.from(getApplicationContext()); View headView = inflater.inflate(R.layout.list_header, null); if(stuList.getHeaderViewsCount()==0) { stuList.addHeaderView(headView); }二、实现修改学生信息的操作
（一）安卓端
1、创建显示学生信息的页面
<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".StudentUpdate"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:layout_editor_absoluteX="219dp" tools:layout_editor_absoluteY="207dp" android:padding="50dp" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="ID:" /> <TextView android:id="@+id/id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" /> LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="昵称:" /> <EditText android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" android:inputType="textPersonName" /> LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="年龄:" /> <EditText android:id="@+id/age" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" /> LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="地址:" /> <EditText android:id="@+id/address" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" android:inputType="phone" /> LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> LinearLayout> <Button android:layout_marginTop="50dp" android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="提交" android:onClick="updatestudent" /> <Button android:id="@+id/button3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="重置" /> LinearLayout>androidx.constraintlayout.widget.ConstraintLayout>2、在student_list.xml页面上的按钮上添加onClick
3、完善Student_List当中的update方法
public void update(View view){ LinearLayout linearLayout = (LinearLayout)(view.getParent().getParent()); TextView idEd = linearLayout.findViewById(R.id.id); TextView nameEd = linearLayout.findViewById(R.id.name); TextView ageEd = linearLayout.findViewById(R.id.age); TextView addressEd = linearLayout.findViewById(R.id.address); Intent intent=new Intent(); intent.putExtra("id", idEd.getText().toString()); intent.putExtra("name", nameEd.getText().toString()); intent.putExtra("age", ageEd.getText().toString()); intent.putExtra("address", addressEd.getText().toString()); intent.setClass(this, StudentUpdate.class); startActivity(intent ); Toast.makeText(getApplicationContext(),"修改",Toast.LENGTH_LONG).show(); }4、StudentUpdate当中获取对应Intent 对象当中的值并放入到页面当中的修改框当中
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_student_update); Intent intent = getIntent(); String id = intent.getStringExtra("id"); String name = intent.getStringExtra("name"); String age = intent.getStringExtra("age"); String address = intent.getStringExtra("address"); TextView idtv = findViewById(R.id.id); EditText nameet = findViewById(R.id.name); EditText ageet = findViewById(R.id.age); EditText addresset = findViewById(R.id.address); idtv.setText(id); nameet.setText(name); ageet.setText(age); addresset.setText(address); }运行测试
（二）web端
1、创建更新学生信息的dao
public boolean update(Student stu){ String sql="update student set name=?,age=?,address=? where id=?"; Connection con = JDBCUtils.getConn(); try { PreparedStatement pst=con.prepareStatement(sql); pst.setString(1,stu.getName()); pst.setInt(2,stu.getAge()); pst.setString(3,stu.getAddress() ); pst.setInt(4,stu.getId() ); int value = pst.executeUpdate(); if(value>0){ return true; } } catch (SQLException throwables) { throwables.printStackTrace(); }finally { JDBCUtils.close(con); } return false; }2、创建对应更新学生信息的Servlet
完善StudentUpdateServlet
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { System.out.println("-----------------");request.setCharacterEncoding("utf-8");response.setCharacterEncoding("UTF-8");int id = Integer.parseInt(request.getParameter("id"));String name = request.getParameter("name");int age = Integer.parseInt(request.getParameter("age"));String address = request.getParameter("address");Student student = new Student();student.setId(id);student.setName(name);student.setAge(age);student.setAddress(address); String msg = ""; StudentDao studentDao = new StudentDao(); boolean flag = studentDao.update(student); if(flag){ msg = "成功"; }else{ msg = "失败"; } PrintWriter out = response.getWriter();out.println(msg);out.flush();out.close();}（三）安卓端
1、在StudentUpdate当中创建updatestudent实现向studentUpdateServlet发送更新信息的请求
package com.example.application01;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.View;import android.widget.EditText;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.example.application01.utils.PostUtil;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;public class StudentUpdate extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_student_update); Intent intent = getIntent(); String id = intent.getStringExtra("id"); String name = intent.getStringExtra("name"); String age = intent.getStringExtra("age"); String address = intent.getStringExtra("address"); TextView idtv = findViewById(R.id.id); EditText nameet = findViewById(R.id.name); EditText ageet = findViewById(R.id.age); EditText addresset = findViewById(R.id.address); idtv.setText(id); nameet.setText(name); ageet.setText(age); addresset.setText(address); } public void updatestudent(View view){ TextView idtv = findViewById(R.id.id); EditText nameet = findViewById(R.id.name); EditText ageet = findViewById(R.id.age); EditText addresset = findViewById(R.id.address); String id = idtv.getText().toString(); String name = nameet.getText().toString(); String age = ageet.getText().toString(); String address = addresset.getText().toString(); new Thread(){ @Override public void run() { String data=""; try { data = "&id="+ URLEncoder.encode(id, "UTF-8")+ "&name="+ URLEncoder.encode(name, "UTF-8")+ "&age="+ URLEncoder.encode(age, "UTF-8")+ "&address="+ URLEncoder.encode(address, "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } String request = PostUtil.Post("studentUpdateServlet",data); int msg = 0; if(request.equals("成功")){ msg = 1; } hand.sendEmptyMessage(msg); } }.start(); } Handler hand=new Handler(){ @Override public void handleMessage(Message msg) { if(msg.what == 1) { startActivity(new Intent( getApplicationContext(), Student_List.class ) ); //startActivity(new Intent( getApplicationContext(), StuInfoActivity.class ) ); } else { Toast.makeText(getApplicationContext(),"更新失败",Toast.LENGTH_LONG).show(); } } };}2、运行测试
| Android Studio 实现登录注册-源代码 （连接MySql数据库） | |
|---|---|
| Android Studio 实现登录注册-源代码 二（Servlet + 连接MySql数据库） | |
| [Android Studio 实现登录注册-源代码 三（Servlet + 连接MySql数据库）实现学生信息的查询 （JSON通信）] | |
| Android Studio 实现实现学生信息的增删改查 -源代码 四（Servlet + 连接MySql数据库） |
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