android HTTP 登陆链接Mysql数据库实现登陆
android HTTP 链接Mysql数据库实现登陆
1.java web本地服务器，链接数据库实现数据库增、查功能
2.android端通过http访问web服务器
一、web端
1.myeclipse新建java web项目
工程目录
2.web.xml如下配置
HelloWeb
LogLet
com.servlet.LogLet
RegLet
com.servlet.RegLet
LogLet
/LogLet
RegLet
/RegLet
index.html
index.htm
index.jsp
default.html
default.htm
default.jsp
3.DBManager.java 链接数据库
package com.db;
import java.sql.*;
public class DBManager {
// 数据库连接常量
public static final String DRIVER = "com.mysql.jdbc.Driver";
public static final String USER = "root"; //用户名
public static final String PASS = "123456"; //密码
public static final String URL = "jdbc:mysql://localhost:3306/test"; //端口3306 数据库名test
// 静态成员，支持单态模式
private static DBManager per = null;
private Connection conn = null;
private Statement stmt = null;
// 单态模式-懒汉模式
private DBManager() {
}
public static DBManager createInstance() {
if (per == null) {
per = new DBManager();
per.initDB();
}
return per;
}
// 加载驱动
public void initDB() {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (Exception e) {
e.printStackTrace();
}
}
// 连接数据库，获取句柄+对象
public void connectDB() {
System.out.println("Connecting to database...");
try {
conn = DriverManager.getConnection(URL, USER, PASS);
stmt = conn.createStatement();
} catch (SQLException e) {
e.printStackTrace();
}
System.out.println("SqlManager:Connect to database successful.");
}
// 关闭数据库 关闭对象，释放句柄
public void closeDB() {
System.out.println("Close connection to database..");
try {
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
System.out.println("Close connection successful");
}
// 查询
public ResultSet executeQuery(String sql) {
ResultSet rs = null;
try {
rs = stmt.executeQuery(sql);
} catch (SQLException e) {
e.printStackTrace();
}
return rs;
}
// 增添/删除/修改
public int executeUpdate(String sql) {
int ret = 0;
try {
ret = stmt.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
}
return ret;
}
}
4.Service.java访问数据库功能实现数据库的增、查功能
package com.service;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.db.DBManager;
public class Service {
public Boolean login(String username, String password) {
// 获取Sql查询语句
String logSql = "select * from user where username ='" + username
+ "' and password ='" + password + "'";
// 获取DB对象
DBManager sql = DBManager.createInstance();
sql.connectDB();
// 操作DB对象
try {
ResultSet rs = sql.executeQuery(logSql);
if (rs.next()) {
sql.closeDB();
return true;
}
} catch (SQLException e) {
e.printStackTrace();
}
sql.closeDB();
return false;
}
public Boolean register(String username, String password) {
// 获取Sql查询语句
String regSql = "insert into user values('"+ username+ "','"+ password+ "') ";
// 获取DB对象
DBManager sql = DBManager.createInstance();
sql.connectDB();
int ret = sql.executeUpdate(regSql);
if (ret != 0) {
sql.closeDB();
return true;
}
sql.closeDB();
return false;
}
}
5.LogLet.java 实现登陆功能的servlet
package com.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.service.Service;
public class LogLet extends HttpServlet{
private static final long serialVersionUID = 9036889586892331384L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//接受客户端信息
String username = request.getParameter("username");
username = new String(username.getBytes("ISO-8859-1"),"UTF-8");
String password = request.getParameter("password");
password = new String(password.getBytes("ISO-8859-1"),"UTF-8");
System.out.println(username + ":" + password);
//新建服务对象
Service service = new Service();
//验证处理
boolean log = service.login(username, password);
if( log ){
System.out.println("log success");
//request.getSession().setAttribute("username", username);
}else{
System.out.println("log fail");
}
//返回信息到客户端
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
if( log ){
out.print("用户名：" + username);
out.print("密码： " + password);
}else{
out.print("false");
}
out.flush();
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO 自动生成的方法存根
}
}
6.RegLet.java 实现注册功能的servlet
package com.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.service.Service;
public class RegLet extends HttpServlet {
private static final long serialVersionUID = 9036889586892331384L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//接受客户端信息
String username = request.getParameter("username");
username = new String(username.getBytes("ISO-8859-1"),"UTF-8");
String password = request.getParameter("password");
password = new String(password.getBytes("ISO-8859-1"),"UTF-8");
System.out.println(username + ":" + password);
//新建服务对象
Service service = new Service();
//验证处理
boolean log = service.register(username, password);
if( log ){
System.out.println("log success");
//request.getSession().setAttribute("username", username);
}else{
System.out.println("log fail");
}
//返回信息到客户端
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
if( log ){
out.print("用户名：" + username);
out.print("密码： " + password);
}else{
out.print("false");
}
out.flush();
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO 自动生成的方法存根
}
}
到这里java web 端完成了
二、Mysql数据库
1.新建数据库test 数据库名test 与java web中的数据库名保持一致
2.建表 包含用户名username字段 和密码 password字段
sql语句
CREATE TABLE user(username VARCHAR(30) primary KEY,
PASSWORD VARCHAR(30) NOT NULL
);
这里数据库和web 服务器都完成了，然后运行web
双击index.jsp然后运行
1.再浏览器输入http://localhost:8080/HelloWeb/RegLet?username=aaa&password=123回车
如果显示
说明注册功能没问题
2.数据库新建查询 执行sql语句 SELECT * FROM user;
说明注册成功，并向数据库中插入数据成功
3.在浏览器中输入 http://localhost:8080/HelloWeb/LogLet?username=aaa&password=123回车
如果出现
说明登陆功能没问题
到这里服务端没问题并且可以成功运行了
三、Android端
1.工程目录 两个Activity Login登陆功能 Register注册功能
Login.java
注意:链接服务器web部分需要到线程中完成
import android.app.ProgressDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.accessibility.AccessibilityManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class Login extends AppCompatActivity implements View.OnClickListener{
private EditText username;
private EditText password;
private Button login;
private TextView info;
private TextView register;
//提示框
private ProgressDialog dialog;
//服务器返回的数据
private String infoString;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//初始化信息
username = (EditText)findViewById(R.id.username);
password = (EditText)findViewById(R.id.password);
login = (Button)findViewById(R.id.btn_login);
info = (TextView)findViewById(R.id.info);
register = (TextView)findViewById(R.id.register);
//设置按钮监听器
login.setOnClickListener(this);
register.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.btn_login:
//设置提示框
//设置子线程，分别进行Get和Post传输数据
new Thread() {
@Override
public void run() {
try {
String path = "http://10.0.2.2:8080/HelloWeb/LogLet" + "?username=" + username.getText() + "&password=" + password.getText();
URL url = new URL(path);
URLConnection urlConnection = url.openConnection();
InputStream in = urlConnection.getInputStream();
printInputStream(in);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
break;
case R.id.register:
//跳转注册页面
Intent intent = new Intent(Login.this,Register.class);
startActivity(intent);
break;
}
}
private void printInputStream(InputStream is){
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuffer sb = new StringBuffer();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
String rs = sb.toString();
Log.e("登陆信息",rs);
}
}
Register.java
注意:链接服务器web部分需要到线程中完成
import android.app.ProgressDialog;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class Register extends AppCompatActivity implements View.OnClickListener{
private EditText regUserName;
private EditText regPassWord;
private Button btn_reg;
ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
//修改标题栏title
ActionBar ac = getSupportActionBar();
ac.setTitle("注册");
//初始化
regUserName = (EditText)findViewById(R.id.regUserName);
regPassWord = (EditText)findViewById(R.id.regPassWord);
btn_reg = (Button)findViewById(R.id.btn_reg);
btn_reg.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.btn_reg:
new Thread() {
@Override
public void run() {
try {
String path = "http://10.0.2.2:8080/HelloWeb/RegLet" + "?username=" + regUserName.getText() + "&password=" + regPassWord.getText();
URL url = new URL(path);
URLConnection urlConnection = url.openConnection();
InputStream in = urlConnection.getInputStream();
printInputStream(in);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
break;
}
}
private void printInputStream(InputStream is){
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuffer sb = new StringBuffer();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
String rs = sb.toString();
Log.e("注册信息",rs);
}
}
布局文件很简单 这里不给出登陆注册
2.AndroidManifest.xml（重点）****
添加网络权限
主界面设为Login.java
在application中添加 android:usesCleartextTraffic=“true”（重点）
整个AndroidManifest.xml
好了android程序写完了，运行
到这里就结束了****实现了android模拟器链接web服务器再链接数据库
但是这里只是实现模拟器链接，如果需要真机链接pc web端服务器就需要内网穿透
（是公网ip请绕过）
四、实现真机访问pc服务器，实现注册、登陆功能
1.很多提供内网穿透服务，这里我们选择花生壳内网穿透
选择新增映射
内网主机填ip地址 控制台 ipconfig/all查看端口号填谢web服务器的端口
确定
将外网访问部分复制到android程序
替换掉里面的10.0.2.2:8080这样
无论哪里的手机，接入什么样的网络都可以链接你PC的web服务器了
最后运行android程序
**源码：**链接：https://pan.baidu.com/s/1RbCKBo7RHxCABOgckmx0Ng
提取码：h7rz
总结：mysql新建数据库，建立web服务器
android端通过http访问PC 机web服务器
重点## 在application中添加 android:usesCleartextTraffic=“true”（重点）
添加网络权限