Android Studio 实现实现学生信息的查询 -源代码 三（Servlet + 连接MySql数据库） （JSON通信）
json
适用于现代 C++ 的 JSON。
项目地址：https://gitcode.com/gh_mirrors/js/json
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一、在数据库当中创建学生信息表
SQL语句：
/*
Navicat MySQL Data Transfer
Source Server : localhost_3306
Source Server Version : 50562
Source Host : localhost:3306
Source Database : test
Target Server Type : MYSQL
Target Server Version : 50562
File Encoding : 65001
Date: 2021-05-17 16:14:29
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `student`
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`age` int(11) NOT NULL,
`address` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES ('1', 'andy', '21', '北京');
INSERT INTO `student` VALUES ('2', 'aaa', '22', '上海');
INSERT INTO `student` VALUES ('3', 'asdc', '34', '大连');
INSERT INTO `student` VALUES ('4', '张三', '20', '北京');
-- ----------------------------
-- Table structure for `users`
-- ----------------------------
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (
`uid` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`username` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL,
`age` int(255) NOT NULL,
`phone` longblob NOT NULL,
PRIMARY KEY (`uid`)
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of users
-- ----------------------------
INSERT INTO `users` VALUES ('2', '123', 'HBV环保局', '123', '33', 0x3133333333333333333333);
INSERT INTO `users` VALUES ('3', '1233', '反复的', '1233', '12', 0x3132333333333333333333);
INSERT INTO `users` VALUES ('4', '1244', '第三代', '1244', '12', 0x3133333333333333333333);
INSERT INTO `users` VALUES ('5', '1255', 'SAS', '1255', '33', 0x3133333333333333333333);
INSERT INTO `users` VALUES ('6', '122', '但是ADS', '122', '12', 0x3132323232323232323232);
INSERT INTO `users` VALUES ('7', 'admin123', 'admin', '123', '45', 0x3132323232323232323232);
INSERT INTO `users` VALUES ('8', 'admin123', 'admin', '123', '45', 0x3132323232323232323232);
INSERT INTO `users` VALUES ('9', 'admin123', 'admin', '123', '45', 0x3132323232323232323232);
INSERT INTO `users` VALUES ('10', 'admin1232', 'admin', '123', '45', 0x3132323232323232323232);
INSERT INTO `users` VALUES ('11', 'admin222', '222', '2222', '222', 0x3232323232323232323232);
INSERT INTO `users` VALUES ('12', 'admin123', '123', '1212', '22', 0x32313231323232323232);
INSERT INTO `users` VALUES ('13', 'admin', 'admin', '2121', '33', 0x3333333333333333333333);
INSERT INTO `users` VALUES ('14', '123121212', '12321212', '123', '12', 0x3132333333333333333333);
二、Android端代码
1、引入JSON相关的驱动包
切换工程目录
添加jar
切换回Android工程
2、创建Student的实体类
package com.example.application01.entity;
public class Student {
private int id;
private String name;
private int age;
private String address;
public Student() {
}
public Student(int id, String name, int age, String address) {
this.id = id;
this.name = name;
this.age = age;
this.address = address;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
3、创建跳转显示学生信息的页面
点击Finish
完善页面信息布局
<?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=".Student_List">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:layout_editor_absoluteX="76dp"
tools:layout_editor_absoluteY="98dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:orientation="horizontal">
<EditText
android:id="@+id/stuname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPersonName"
/>
<Button
android:id="@+id/buttonStu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="查询" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:orientation="horizontal">
<ListView
android:id="@+id/stulist"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
4、修改MainActivity当中的登录成功方法，设置其跳转到上述创建的页面当中
全部代码
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.View;
import android.widget.EditText;
import android.widget.Toast;
import com.example.application01.dao.UserDao;
import com.example.application01.utils.PostUtil;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void reg(View view){
startActivity(new Intent(getApplicationContext(),RegisterActivity.class));
}
public void login(View view){
EditText EditTextname = (EditText)findViewById(R.id.name);
EditText EditTextpassword = (EditText)findViewById(R.id.password);
new Thread(){
@Override
public void run() {
String data="";
try {
data = "name="+ URLEncoder.encode(EditTextname.getText().toString(), "UTF-8")+
"&password="+ URLEncoder.encode(EditTextpassword.getText().toString(), "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
String request = PostUtil.Post("LoginServlet",data);
int msg = 0;
if(request.equals("成功")){
msg = 1;
}
hand1.sendEmptyMessage(msg);
}
}.start();
}
final Handler hand1 = new Handler()
{
@Override
public void handleMessage(Message msg) {
if(msg.what == 1)
{
//Toast.makeText(getApplicationContext(),"登录成功",Toast.LENGTH_LONG).show();
startActivity(new Intent(getApplicationContext(),Student_List.class));
}
else
{
Toast.makeText(getApplicationContext(),"登录失败",Toast.LENGTH_LONG).show();
}
}
};
}
5、创建一个XML页面用于显示ListView内部的东西
student_list.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="20dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="id" />
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
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_weight="1"
android:text="年龄" />
<TextView
android:id="@+id/address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="地址" />
</LinearLayout>
</LinearLayout>
5、创建StudentAdapter
package com.example.application01;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.example.application01.entity.Student;
import java.util.ArrayList;
public class StudentAdapter extends BaseAdapter {
ArrayList<Student> studatalist = new ArrayList<>();
private Context mContext;
public StudentAdapter(ArrayList<Student> sData, Context mContext) {
this.sData = sData;
this.mContext = mContext;
}
@Override
public int getCount() {
return sData.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.student_list,null);
TextView txt_id = (TextView) convertView.findViewById(R.id.id);
TextView txt_name = (TextView) convertView.findViewById(R.id.name);
TextView txt_age = (TextView) convertView.findViewById(R.id.age);
TextView txt_address = (TextView) convertView.findViewById(R.id.address);
txt_id.setText(sData.get(position).getId()+"");
txt_name.setText(sData.get(position).getName());
txt_age.setText(sData.get(position).getAge()+"");
txt_address.setText(sData.get(position).getAddress());
return convertView;
}
}
6、在Student_List当中实现点击搜索，并显示对应是学生列表
(1)修改activity_student_list.xnl当中的按钮
添加onClick
(2)在Student_List当中完善对应的方法
package com.example.application01;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import com.example.application01.entity.Student;
import com.example.application01.utils.PostUtil;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
public class Student_List extends AppCompatActivity {
EditText editTextname = null;
ArrayList<Student> studatalist = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student__list);
editTextname = findViewById(R.id.stuname);
}
public void findALLStudent(View view){
new Thread() {
public void run() {
if(studatalist != null){
studatalist.clear();
}
String data="";
try {
data = "name="+ URLEncoder.encode(editTextname.getText().toString(), "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
String stuJson= PostUtil.Post("studentServlet",data);
try {
JSONArray jsonArray = new JSONArray(stuJson);
for(int i = 0;i < jsonArray.length();i++){
JSONObject jsonObject = (JSONObject) jsonArray.get(i);
Student student = new Student();
student.setId(jsonObject.getInt("id"));
student.setName(jsonObject.getString("name"));
student.setAge(jsonObject.getInt("age"));
student.setAddress(jsonObject.getString("address"));
studatalist.add(student);
}
} catch (org.json.JSONException e) {
e.printStackTrace();
}
/*
*/
hand.sendEmptyMessage(1);
}
}.start();
}
Handler hand=new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.what == 1)
{
ListView stuList = (ListView) findViewById(R.id.stulist);
StudentAdapter adapter = new StudentAdapter( studatalist, Student_List.this);
stuList.setAdapter(adapter);
//startActivity(new Intent( getApplicationContext(), StuInfoActivity.class ) );
}
else
{
Toast.makeText(getApplicationContext(),"查询错误",Toast.LENGTH_LONG).show();
}
}
};
}
三、Web端代码
1、创建Student实体类直接Android的复制即可
package entity;
public class Student {
private int id;
private String name;
private int age;
private String address;
public Student() {
}
public Student(int id, String name, int age, String address) {
this.id = id;
this.name = name;
this.age = age;
this.address = address;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
2、创建对应的StudentDao查询
package dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import entity.Student;
public class StudentDao {
public ArrayList<Student> getStuByName(String name)
{
ArrayList<Student> stuList=new ArrayList<Student>();
String sql="select * from student where name like '%"+name+"%'";
Connection con=JDBCUtils.getConn();
try {
PreparedStatement pst=con.prepareStatement(sql);
ResultSet rs=pst.executeQuery();
while(rs.next())
{
Student stu=new Student();
stu.setId(rs.getInt(1));
stu.setName(rs.getString(2));
stu.setAge(rs.getInt(3));
stu.setAddress(rs.getString(4));
stuList.add(stu);
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
JDBCUtils.close(con);
}
return stuList;
}
}
3、在web工程当中引入JSON相关的jar
4、创建StudentServlet
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import dao.StudentDao;
import dao.UserDao;
import entity.Student;
public class StudentServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//获取请求名字
String name=request.getParameter("name");
//调用dao层
StudentDao studentDAO=new StudentDao();
ArrayList<Student> stuList=studentDAO.getStuByName(name);
response.setContentType("application/x-json");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
JSONArray jsonArray = JSONArray.fromObject(stuList);
out.print(jsonArray);
out.flush();
out.close();
}
}
四、运行测试
先启动web端代码
运行Android端代码
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