团队冲刺第二天--校园百晓生（STDeverything）

摘要：今天实现了安卓端使用http将用户注册信息存入云服务器mysql数据库。

遇到问题：安卓端注册请求http成功返回200，但是刷新数据库发现里面并没有数据。

原因：云服务器数据库相对于云服务器是本地，url地址应为URL="jdbc:mysql://localhost:3306，而我写入了服务器地址号（低级错误找了半天）

解决方法：URL="jdbc:mysql://localhost:3306

代码部分：

package Entity;

public class Users {

    public Users() {
        // TODO Auto-generated constructor stub
    }
    
    public String getUserid() {
        return userid;
    }

    public void setUserid(String userid) {
        this.userid = userid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    private String userid;
    private String username;
    private String pwd;
    private String date;

}

package Servlet;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

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 DBUtil.DBUtil;
import Entity.Users;

/**
 * Servlet implementation class login_servlet
 */
@WebServlet("/login_servlet")
public class login_servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public login_servlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
     */
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=UTF-8");
        String method=request.getParameter("method");
        System.out.println("执行service");
        if(method.equals("register"))
            registerUser(request, response);
        else if(method.equals("login"))
            checkLogin(request, response);
    }
    
    private void registerUser(HttpServletRequest request, HttpServletResponse response) throws IOException {   //用户注册
        Users users=new Users();
        users.setUsername(request.getParameter("name"));
        users.setPwd(request.getParameter("pwd"));
        DBUtil.registerUser(users);
    }
    
    private void checkLogin(HttpServletRequest request, HttpServletResponse response) throws IOException {  //用户登录
        String name=request.getParameter("name");
        String pwd=request.getParameter("pwd");
        response.getWriter().write(DBUtil.checklogin(name, pwd));
    }
    
    

}

public class DBUtil {

    private static String model="0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
    private static String URL="jdbc:mysql://localhost:3306/stdeverything?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC";
    private static String username="root";
    private static String password="password";
    public static Connection getConnection() {
        Connection connection=null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            connection=DriverManager.getConnection(URL, username, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return connection;
    }
    public DBUtil() {
        // TODO Auto-generated constructor stub
    }
    
    private static void closeDB(Connection connection,Statement statement,ResultSet resultSet) {  //关闭连接
        if(connection!=null)
            try {
                connection.close();
            } catch (SQLException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
        if(statement!=null)
            try {
                statement.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        if(resultSet!=null)
            try {
                resultSet.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }
    
    public static String getDateString(boolean type) {       //获取当前时间
        Date date=new Date();
        SimpleDateFormat sdf1=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        SimpleDateFormat sdf2=new SimpleDateFormat("yyyyMMddHHmmssSSS");
        return type?sdf1.format(date):sdf2.format(date);
    }
    
    public static String getIdentifier() {    //生成编码
        String str="";
        for(int i=0;i<10;i++)
            str+=model.charAt((int)(Math.random()*100)%62);
        return str+getDateString(false);
    }
    
    public static void registerUser(Users users) {   //用户注册
        String sql="insert into user values('"+getIdentifier()+"','"+users.getUsername()+"','"+users.getPwd()+"','"+getDateString(true)+"','')";
        Connection connection=getConnection();
        try {
            Statement statement=connection.createStatement();
            statement.executeUpdate(sql);
            closeDB(connection, statement, null);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("用户注册出错");
        }
    }
    
    public static String checklogin(String name,String pwd) {    //检查登录
        JSONObject jsonObject=new JSONObject();
        jsonObject.put("status", "0");
        String sql="select * from user where name='"+name+"'";
        String sql_id=null,sql_pwd=null;
        Connection connection=getConnection();
        ResultSet rs=null;
        try {
            Statement statement=connection.createStatement();
            rs=statement.executeQuery(sql);
            if(rs.next()) {
                sql_id=rs.getString("id");
                sql_pwd=rs.getString("pwd");
                jsonObject.put("id", sql_id);
                jsonObject.put("name", "yes");
            }else {
                jsonObject.put("id", "");
                jsonObject.put("name", "no");
                jsonObject.put("msg", "用户名不存在");
            }
            closeDB(connection, statement, rs);
            if(jsonObject.get("name").equals("yes")) {
                if(pwd.equals(sql_pwd)) {
                    jsonObject.put("msg", "登陆成功");
                    jsonObject.put("status", "1");
                }else {
                    jsonObject.put("msg", "密码不正确");                
                }
            }
            
            return jsonObject.toString();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("登陆时出错");
        }
        return null;
    }

打包放入服务器然后再android端请求服务器就ok了！

数据库：

明天尝试添加第三方登录（首先考虑腾讯）