Android端实现用户登录

系统管理员 2022-08-04 12:45 159阅读 0赞

首先是web端，新建一个servlet：Sign.java

和web端登录的servlet相似

package cn.edu.hpu.android;
    
    import java.io.IOException;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import cn.edu.service.impl.CompetitorManager;
    import cn.edu.service.impl.CompetitorManagerImpl;
    
    public class Login 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 {
    		
    		response.setContentType("text/plain");
    		response.setCharacterEncoding("UTF-8");
    		
    		CompetitorManager cm = new CompetitorManagerImpl();
    		//得到Android端传来的数据
    		String username = request.getParameter("username");
    		String password = request.getParameter("password");
    		//调用登录方法，判断用户名、密码是否匹配
    		int flag = cm.checkLogin(username, password);
    		if(flag != 0){
    			response.getOutputStream().write("success".getBytes());
    		}
    	}
    }

Android端，新建一个class：

package cn.edu.hpu.utils;
    
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    
    public class LoginService {
    	
    	public static int LoginConnectWeb(String username,String password) throws Exception {
    		//String path = "http://10.48.57.119:8080/tennis_game/Login?username="+username+"&&password="+password;
    		String path = "http://192.168.0.21:8080/tennis_game/Login?username="+username+"&&password="+password;
    		//将path包装成一个URL对象
    		URL url = new URL(path);
    		//System.out.println(url);
    		HttpURLConnection conn = (HttpURLConnection)url.openConnection();
    		//设置超时时间
    		conn.setReadTimeout(5000);
    		//设置请求方式
    		conn.setRequestMethod("GET");
    		//判断请求是否成功
    		if(conn.getResponseCode() == 200) {
    			//流的工具类，专门从流中读取数据（返回的是二进制数据）
    			InputStream inStream = conn.getInputStream();
    			//返回json解析数据
    			return parseJSON(inStream);
    		}		
    		return 0;		
    	}
    
    	private static int parseJSON(InputStream inStream) throws Exception {
    		//StreamTool一个输入输出流类
    		byte[] data = StreamTool.read(inStream);
    		String json = new String(data);	
    		if(json.equals("success")) {
    			return 1;
    		}
    		else{
    			return 0;
    		}
    	}
    }

MainActivity.java

package com.example.login;
    
    import cn.edu.hpu.utils.LoginService;
    import android.os.Bundle;
    import android.os.StrictMode;
    import android.annotation.SuppressLint;
    import android.app.Activity;
    import android.content.Intent;
    import android.content.SharedPreferences;
    import android.content.SharedPreferences.Editor;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.Window;
    import android.widget.Button;
    import android.widget.CheckBox;
    import android.widget.EditText;
    import android.widget.Toast;
    
    @SuppressLint("NewApi")
    public class MainActivity extends Activity {
    	
    	private Button login;
    	private Button register;
    	private EditText name,pwd;
    	private CheckBox remember, login_auto;
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		this.requestWindowFeature(Window.FEATURE_NO_TITLE);//去除标题栏
    		super.onCreate(savedInstanceState);
    		
    		StrictMode.setThreadPolicy(new 
    				StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());
    				StrictMode.setVmPolicy(
    				new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedClosableObjects().penaltyLog().penaltyDeath().build());
    
    		setContentView(R.layout.activity_main);
    		
    		name = (EditText) findViewById(R.id.username);
    		pwd = (EditText) findViewById(R.id.password);
    		remember = (CheckBox) findViewById(R.id.remember);
    		login_auto = (CheckBox) findViewById(R.id.login_auto);
    		
    		login = (Button) findViewById(R.id.login);
    		login.setOnClickListener(new OnClickListener() {
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				
    				String username = name.getText().toString();
    				String password = pwd.getText().toString();
    				
    				//利用SharedPreferences 保存用户的登录信息
    				SharedPreferences sp =getSharedPreferences("FILE", MODE_PRIVATE);
    				Editor editor = sp.edit();
    				editor.putString("username", username);
    				editor.commit();
    			
    				int s = 0;
    				try{
    					s = LoginService.LoginConnectWeb(username, password);	
    					if(s == 1) {
    						Intent intent = new Intent(MainActivity.this,ZhuYeActivity.class);
    						startActivity(intent);
    					    Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_SHORT).show();
    				    }else {
    					    Toast.makeText(getApplicationContext(), "账号或密码错误请重新输入！", Toast.LENGTH_SHORT).show();
    				    }
    				} catch (Exception e) {
    							// TODO Auto-generated catch block
    							e.printStackTrace();
    				}
    			}
    		});
    		
    		register = (Button) findViewById(R.id.register);
    		register.setOnClickListener(new OnClickListener() {		
    			@Override
    			public void onClick(View v) {
    				Intent intent = new Intent(MainActivity.this,RegisterActivity.class);
    				startActivity(intent);			
    			}
    		});
    	}
    }

activity\_main.xml中代码较长且比较简单，故省略