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一、完善学生信息显示

1、修改和删除的按钮在student_list.xml当中

2、添加表头的xml，创建list_header.xml

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

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

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

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