WebServlet.Sqlite OkHttp實現賬戶管理系統的設計

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create user(name text,pwd text);

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package demo01;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.Statement;

import java.util.Scanner;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/login.do")

public class Login extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=UTF-8");

        PrintWriter   out=response.getWriter();

        String   name=request.getParameter("name");

        //String   pwd=request.getParameter("pwd");

        if(name!=null){

            name=new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");

        }

        out.println("歡迎您 !"+name);

        System.out.println(request.getRemoteAddr()+"-"+name);

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=UTF-8");

        PrintWriter   out=response.getWriter();

        request.setCharacterEncoding("UTF-8");

        String    name=request.getParameter("name");

        String   pwd=request.getParameter("pwd");

        String   type=request.getParameter("type");

        if(type.equals("login")){

        try {

            String   sql="select * from user where name=? and pwd=?";

            Class.forName("org.sqlite.JDBC");

            Connection   conn=DriverManager.getConnection("jdbc:sqlite:/c:/sqlite/db/my.db");

            PreparedStatement   stmt=conn.prepareStatement(sql);

            stmt.setString(1,name);

            stmt.setString(2,pwd);

            ResultSet   rs=stmt.executeQuery();

            if(rs.next()){

                out.println("登入成功!歡迎"+name);

            }else{

                out.println("使用者名稱或密碼錯誤!");

            }

            rs.close();

            stmt.close();

            conn.close();

            out.close();

        }   catch (Exception   e) {

            e.printStackTrace();

        }

    }else if(type.equals("A")){

        try {

            String   sql="select * from user";

            Class.forName("org.sqlite.JDBC");

            Connection   conn=DriverManager.getConnection("jdbc:sqlite:/c:/sqlite/db/my.db");

            PreparedStatement   stmt=conn.prepareStatement(sql);

            ResultSet   rs=stmt.executeQuery();

            while(rs.next()){

                out.println("姓名:"+rs.getString(1)+"----"+"密碼:"+rs.getString(2));

            }

            stmt.close();

            rs.close();

            conn.close();

            out.close();

        }   catch (Exception   e) {

            e.printStackTrace();

        }

    }else if(type.equals("B")){

        String   sql="insert into user values('"+name+"'"+","+"'"+pwd+"'"+")";

        try {

            Class.forName("org.sqlite.JDBC");

            Connection   conn=DriverManager.getConnection("jdbc:sqlite:/c:/sqlite/db/my.db");

            Statement   stmt=conn.createStatement();

            int rs=stmt.executeUpdate(sql);

            if(rs>0){

                out.println("新增成功!");

            }else{

                out.println("新增失敗！");

            }

            stmt.close();

            conn.close();

            out.close();

        }   catch (Exception   e) {

            e.printStackTrace();

        }

    }else if(type.equals("C")){

         String   sql="update user set pwd="+"'"+pwd+"'"+"where   name="+"'"+name+"'";

          try {

            Class.forName("org.sqlite.JDBC");

            Connection   conn=DriverManager.getConnection("jdbc:sqlite:/c:/sqlite/db/my.db");

            Statement   stmt=conn.createStatement();

            int rs=stmt.executeUpdate(sql);

            if(rs>0){

                  out.println("修改成功!");

            }else{

                  out.println("修改失敗 ！");

            }

            stmt.close();

            conn.close();

        }   catch (Exception   e) {

            e.printStackTrace();

        }

    }else if(type.equals("D")){

        String   sql="delete from User where name="+"'"+name+"'";

        try {

            Class.forName("org.sqlite.JDBC");

            Connection   conn=DriverManager.getConnection("jdbc:sqlite:/c:/sqlite/db/my.db");

            Statement   stmt=conn.createStatement();

            int rs=stmt.executeUpdate(sql);

            if(rs>0){

                 out.println("刪除成功!");

            }else{

                 out.println("刪除失敗!");

            }

            stmt.close();

            conn.close();

        }   catch (Exception   e) {

            e.printStackTrace();

        }

    }

    }

}

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package demo01;

import java.io.IOException;

import java.util.Scanner;

import okhttp3.FormBody;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.RequestBody;

import okhttp3.Response;

public class Oklogin   {

    public static void main(String[]   args) {

        boolean flag=false;

        Scanner   sc=new Scanner(System.in);

        System.out.println("歡迎進入學生管理系統的登入頁面！");

        System.out.println("請輸入使用者名稱:");

        String   name=sc.nextLine();

        System.out.println("請輸入密碼:");

        String   pwd=sc.nextLine();

        String   type="login";

        OkHttpClient   client=new OkHttpClient();

        RequestBody   body=new FormBody.Builder().add("name",name).add("pwd",pwd).add("type",type).build();

        Request   request=new Request.Builder().url("").post(body).build();

        try {

            Response   response=client.newCall(request).execute();

            if(response.isSuccessful()){

                System.out.println(response.body().string());

                flag=true;

            }

        }   catch (Exception   e) {

            e.printStackTrace();

        }

        if(flag){

            load();

        }

    }

    private static void load()   {

         while(true){

                System.out.println("歡迎來到學生賬號資訊管理系統:");

                System.out.println("--------------------------");

                System.out.println("1:增加使用者資訊");

                System.out.println("2:刪除使用者資訊");

                System.out.println("3:修改使用者資訊");

                System.out.println("4:檢視使用者資訊");

                System.out.println("5:退出系統!");

                System.out.println("----------------------------");

                System.out.println("請選擇:");

                Scanner   sc=new Scanner(System.in);

                int choose=0;

                while(true){

                    try {

                        choose   = sc.nextInt();

                        break;

                    }   catch (Exception   e) {

                        sc.next();//清除上次輸入的資訊

                        System.out.println("請輸入合法資訊:");

                    }

                }

                switch (choose) {

                    case 1:

                        addUser();

                        break;

                    case 2:

                        deleteUser();

                        break;

                    case 3:

                        modifyUser();

                        break;

                    case 4:

                        findAllUser();

                        break;

                    case 5:

                        System.out.println("退出成功!");

                        return;

                }

                 System.out.println("按任意鍵回到首頁:");

                 String   name=sc.next();

                }//while

    }

    private static void deleteUser()   {

        Scanner   sc=new Scanner(System.in);

        System.out.println("請輸入您刪除的使用者名稱:");

        String   name=sc.nextLine();

        String   type="D";

        OkHttpClient   client=new OkHttpClient();

        RequestBody   body=new FormBody.Builder().add("name",name).add("type",type).build();

        Request   request=new Request.Builder().url("").post(body).build();

        try {

            Response   response=client.newCall(request).execute();

            if(response.isSuccessful()){

                System.out.println(response.body().string());

            }

        }   catch (Exception   e) {

            e.printStackTrace();

        }

    }

    private static void modifyUser()   {

        Scanner   sc=new Scanner(System.in);

        System.out.println("請輸入您修改的使用者名稱:");

        String   name=sc.nextLine();

        System.out.println("請輸入您修改的密碼:");

        String   pwd=sc.nextLine();

        String   type="C";

        OkHttpClient   client=new OkHttpClient();

        RequestBody   body=new FormBody.Builder().add("name",name).add("pwd",pwd).add("type",type).build();

        Request   request=new Request.Builder().url("").post(body).build();

        try {

            Response   response=client.newCall(request).execute();

            if(response.isSuccessful()){

                System.out.println(response.body().string());

            }

        }   catch (Exception   e) {

            e.printStackTrace();

        }    

    }

    private static void addUser()   {

        Scanner   sc=new Scanner(System.in);

        System.out.println("請輸入新增的使用者名稱:");

        String   name=sc.nextLine();

        System.out.println("請輸入新增的密碼:");

        String   pwd=sc.nextLine();

        String   type="B";

        OkHttpClient   client=new OkHttpClient();

        RequestBody   body=new FormBody.Builder().add("name",name).add("pwd",pwd).add("type",type).build();

        Request   request=new Request.Builder().url("").post(body).build();

        try {

            Response   response=client.newCall(request).execute();

            if(response.isSuccessful()){

                System.out.println(response.body().string());

            }

        }   catch (Exception   e) {

            e.printStackTrace();

        }    

    }

    private static void findAllUser()   {

        String   type="A";

        OkHttpClient   client=new OkHttpClient();

        RequestBody   body=new FormBody.Builder().add("type",type).build();

        Request   request=new Request.Builder().url("").post(body).build();

        try {

            Response   response=client.newCall(request).execute();

            if(response.isSuccessful()){

                System.out.println(response.body().string());

            }

        }   catch (Exception   e) {

            e.printStackTrace();

        }    

    }

}