android客户端向服务器端验证登陆方法的实现1

遇到的问题：一个条件查询与多个条件查询，所用到的方式不一样

参考文档： http://www.oschina.net/question/1160609_133366    mybatis多条件查询的一个错误

解决方案如下：

利用序列号的方式解决多个参数的查询问题。对象与数据库关系的映射层。我们也可以用hashmap实现。

层次结构如下：

首先定义model层里面的Userlist类，这是和我们后台mysql里面的表是一一对应的，然后定义UserlistMapper类，这个类主要是用来封装一些个方法，比如说增删改查等。其实现通过UserlistMapper.xml来实现，这个里面主要涉及一些sql语句。

做完上面这些以后，我们就需要和客户端交互，所以定义SrvUserlist类，主要与客户端进行交互。里面有dopost与doget等方法。当然先是响应service（）的方法，然后根据客户端的请求，选择不同的方法进行响应。比如说，客户端请求的是post方法，那么服务器端就需要执行dopost方法与之对应。

dao层代码：（Data access object）包含的数据的所有操作。数据访问层：

package zhuxuekui.data;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import zhuxuekui.model.Userlist;

public interface UserlistMapper {

    Userlist selectUserlist(@Param("username")String username,@Param("passward")String passward);

}

参见这篇帖子：http://zhuyuehua.iteye.com/blog/1721715

配置文件：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

    <mapper  namespace="zhuxuekui.data.UserlistMapper">

        <resultMap id="userResultMap"  type="Userlist">

            <result property="username" column="username"></result>

            <result property="passward" column="passward"></result>

        </resultMap>        

        <select id="selectUserlist"  parameterType="Map"

            resultMap="userResultMap">

            select  * from userlist     

            where username = #{username}  and passward = #{passward}

        </select>      

    </mapper>

Model层：

package zhuxuekui.model;

public class Userlist {

    public String username;

    public String passward;

}

Service层：

package zhuxuekui.service;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.ibatis.builder.annotation.MapperAnnotationBuilder;

import org.apache.ibatis.session.SqlSession;

import zhuxuekui.data.UserlistMapper;

import zhuxuekui.model.Userlist;

public class SrvUserlist extends HttpServlet {

    private static final long serialVersionUID = 1L;

    @Override

    protected void service(HttpServletRequest req, HttpServletResponse res)

            throws ServletException, IOException {

        res.getWriter().println("Hello World｜｜｜｜!");

        super.service(req, res);

    }

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse res)

            throws ServletException, IOException {

//         String resource = "/com/arthur/data/Configuration.xml";

//         Reader reader;

//         try {

//         reader = Resources.getResourceAsReader(resource);

//         Constants.SQL_FACTORY = new SqlSessionFactoryBuilder()

//         .build(reader);

//         } catch (Exception e) {

//         e.printStackTrace();

//         e.printStackTrace(res.getWriter());

//         }

        String username = req.getParameter("username");

        String passward = req.getParameter("passward");

//        

//        System.out.println("账号： "+username);

//        System.out.println("密码："+passward);

        SqlSession session = Constants.SQLFactory().openSession();

        //UserlistMapper  userMapper =session.getMapper(UserlistMapper.class);

      //  Userlist userlist = userMapper.selectUserlist(username);

        //加载映射 ，与 userlistMapper挂钩 ，就是一条sql语句

        UserlistMapper mapper = session.getMapper(UserlistMapper.class);

        //从数据库当中选择一条对的语句，进行比对。返回一条记录 

        Userlist userlist = mapper.selectUserlist(username,passward);

        if (userlist !=null) {

            //res.getWriter().println("there is no user with name" + username);

            String json = Constants.GSON.toJson(userlist);

            res.getWriter().println(json);

        }

        else {

            res.getWriter().println("there is new reader with name" + username);

        }

    }

    @Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp)

            throws ServletException, IOException {

        this.doGet(req, resp);

        //String userName = req.getParameter("username");

        String username = req.getParameter("username");

        String passward = req.getParameter("passward");

        System.out.println("账号： "+username);

        System.out.println("密码："+passward);

        SqlSession session = Constants.SQLFactory().openSession();

        UserlistMapper mapper = session.getMapper(UserlistMapper.class);

        Userlist userlist = mapper.selectUserlist(username,passward);

        if (userlist != null) {

            resp.setStatus(200);

        } else {

            resp.sendError(345, "用户名密码不正确！");

        }

    }

}

服务器端调试界面：

客户端代码：

package com.buu.play.aa;

import org.apache.http.Header;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.LinearLayout.LayoutParams;

import android.widget.Toast;

import com.buu.play.BMapApiDemoMain;

import com.buu.play.DemoApplication;

import com.loopj.android.http.AsyncHttpClient;

import com.loopj.android.http.BaseJsonHttpResponseHandler;

import com.loopj.android.http.RequestParams;

public class LoginActivity extends Activity implements OnClickListener {

    static final String TAG = "ahttp";

    private EditText etName, etPsw;

    private Button btnLogin;

    AsyncHttpClient httpClient;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        httpClient = DemoApplication.instance().asyncHttpClient;

        LinearLayout ll = new LinearLayout(this);

        ll.setOrientation(LinearLayout.VERTICAL);

        ll.setPadding(25, 25, 25, 25);

        setContentView(ll);

        etName = new EditText(this);

        etName.setHint("用户名");

        ll.addView(etName, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);

        etPsw = new EditText(this);

        etPsw.setHint("密码");

        ll.addView(etPsw, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);

        btnLogin = new Button(this);

        btnLogin.setText("登 录");

        btnLogin.setOnClickListener(this);

        ll.addView(btnLogin, LayoutParams.MATCH_PARENT,

                LayoutParams.WRAP_CONTENT);

    }

    @Override

    public void onClick(View v) {

        // Intent intent = new Intent(LoginActivity.this,

        // BMapApiDemoMain.class);

        // LoginActivity.this.startActivity(intent);

        if (!isValid()) {

            Toast.makeText(LoginActivity.this, "用户名密码没有填写", Toast.LENGTH_LONG)

                    .show();

            // 用户名密码没有填写

            return;

        }

        //

        // TODO do request

        RequestParams param = new RequestParams();

        param.put("username", etName.getText().toString());

        param.put("passward", etPsw.getText().toString());

        httpClient.post("http://192.168.1.106:8080/login", param,

                new BaseJsonHttpResponseHandler<Object>() {

                    @Override

                    public void onSuccess(int statusCode, Header[] headers,

                            String rawJsonResponse, Object response) {

                        Log.d(TAG, rawJsonResponse);

                        Intent intent = new Intent(LoginActivity.this,

                                BMapApiDemoMain.class);

                        LoginActivity.this.startActivity(intent);

                        finish();

                    }

                    @Override

                    public void onFailure(int statusCode, Header[] headers,

                            Throwable throwable, String rawJsonData,

                            Object errorResponse) {

                        // Intent intent = new Intent(LoginActivity.this,

                        // BMapApiDemoMain.class);

                        // LoginActivity.this.startActivity(intent);

                        // finish();

                        Toast.makeText(LoginActivity.this, "用户名密码错误",

                                Toast.LENGTH_LONG).show();

                    }

                    @Override

                    protected Object parseResponse(String rawJsonData,

                            boolean isFailure) throws Throwable {

                        Log.d(TAG, rawJsonData);

                        return rawJsonData;

                    }

                });

    }

    private boolean isValid() {

        return etName.getText().length() > 0 && etPsw.getText().length() > 0;

    }

}

改进：1）客户端：没有做注册，只做了一个登陆。后期可能需要优化。

2）服务器端：只尝试了序列号的方法，后期尝试hashmap方法。