Android网络编程之——Android登录系统模块的实现(客户端+服务器端Servlet+MySQL)

我不是女神ヾ 2022-08-14 03:45 82阅读 0赞

原博客地址：http://www.cnblogs.com/moka/archive/2013/05/13/3075500.html

写完服务器端之后，开始完成客户端，客户端斜对比较简单，新建一个Android项目结构如下：

![13122221-d2b5a4bf6e2046be9d7e47b21cb93078.jpg][]

com.moka.activities放各种主UI操作界面，com.moka.util包中放工具类

布局文件这里省略了，非常简单，看起来像这样：

![13122728-add007d01af640b3bec4a07b9643f18a.jpg][]

先写工具类HttpUtil，此类封装了get与post方式发出请求与接受回应的各种方法

![ExpandedBlockStart.gif][]

![复制代码][copycode.gif]

public class HttpUtil {
        // 基础URL,注意此处若为模拟器实验，ip不可为localhost而需要为需要为10.0.2.2
        public static final String BASE_URL="http://10.0.2.2:8080/WirelessServer/";
        // 获得Get请求对象request
        public static HttpGet getHttpGet(String url){
            HttpGet request = new HttpGet(url);
             return request;
        }
        // 获得Post请求对象request
        public static HttpPost getHttpPost(String url){
             HttpPost request = new HttpPost(url);
             return request;
        }
        // 根据请求获得响应对象response
        public static HttpResponse getHttpResponse(HttpGet request) throws ClientProtocolException, IOException{
            HttpResponse response = new DefaultHttpClient().execute(request);
            return response;
        }
        // 根据请求获得响应对象response
        public static HttpResponse getHttpResponse(HttpPost request) throws ClientProtocolException, IOException{
            HttpResponse response = new DefaultHttpClient().execute(request);
            return response;
        }
        
        // 发送Post请求，获得响应查询结果
        public static String queryStringForPost(String url, String account, String password){
            // 根据url获得HttpPost对象
            HttpPost request = HttpUtil.getHttpPost(url);
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("account", account));
            params.add(new BasicNameValuePair("password", password));
            String result = null;
            try {
                request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
                // 获得响应对象
                HttpResponse response = HttpUtil.getHttpResponse(request);
                // 判断是否请求成功
                if(response.getStatusLine().getStatusCode()==200){
                    // 获得响应
                    result = EntityUtils.toString(response.getEntity());
    System.out.println("HttpUtil result: " + result);
                    return result;
                }
            } catch (ClientProtocolException e) {
                e.printStackTrace();
                result = "网络异常！";
                return result;
            } catch (IOException e) {
                e.printStackTrace();
                result = "网络异常！";
                return result;
            }
            return null;
        }
    
        // 发送Get请求，获得响应查询结果
        public static String queryStringForGet(String url){
            // 获得HttpGet对象
            HttpGet request = HttpUtil.getHttpGet(url);
            String result = null;
            try {
                // 获得响应对象
                HttpResponse response = HttpUtil.getHttpResponse(request);
                // 判断是否请求成功
                if(response.getStatusLine().getStatusCode()==200){
                    // 获得响应
                    result = EntityUtils.toString(response.getEntity());
                    return result;
                }
            } catch (ClientProtocolException e) {
                e.printStackTrace();
                result = "网络异常！";
                return result;
            } catch (IOException e) {
                e.printStackTrace();
                result = "网络异常！";
                return result;
            }
            return null;
        }
    }

![复制代码][copycode.gif]

然后写Activity:

准备组件和监听事件：

![ExpandedBlockStart.gif][]

![复制代码][copycode.gif]

public class LoginActivity extends Activity {
    
        private Button cancelBtn, loginBtn;
        private EditText userEditText, pwdEditText;
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setTitle("登录系统");
            setContentView(R.layout.activity_login);
            
            cancelBtn = (Button) findViewById(R.id.cancelButton);
            loginBtn = (Button) findViewById(R.id.loginButton);
            userEditText = (EditText) findViewById(R.id.userEditText);
            pwdEditText = (EditText) findViewById(R.id.pwdEditText);
    
            cancelBtn.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    finish();
                }
            });
    
            loginBtn.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    // 检查用户是否输入用户名密码
                    if (validate()) {
                        // 检查是否登陆成功
                        if (login()) {
                            Toast.makeText(LoginActivity.this, "成功",
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(LoginActivity.this, "用户名称或者密码错误，请重新输入！",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                }
            });
        }

![复制代码][copycode.gif]

验证用户是否输入用户名和密码的方法：

![ExpandedBlockStart.gif][]

![复制代码][copycode.gif]

// 验证用户名密码是否为空
        private boolean validate() {
            String username = userEditText.getText().toString();
            if (username.equals("")) {
                Toast.makeText(LoginActivity.this, "用户名称是必填项！", Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
            String pwd = pwdEditText.getText().toString();
            if (pwd.equals("")) {
                Toast.makeText(LoginActivity.this, "用户密码是必填项！", Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
            return true;
        }

![复制代码][copycode.gif]

验证登陆方法:

![ExpandedBlockStart.gif][]

![复制代码][copycode.gif]

// 登录方法
        private boolean login() {
            // 获得用户名称
            String username = userEditText.getText().toString().trim();
            // 获得密码
            String pwd = pwdEditText.getText().toString().trim();
            // 获得登录结果
            String result = query(username, pwd);
            if (result != null && result.equals("0")) {
                return false;
            } else {
    System.out.println("LoginActivity result: " + result);
                // 将此服务器返回的此用户信息保存起来
                saveUserMsg(result);
                return true;
            }
        }

![复制代码][copycode.gif]

![ContractedBlock.gif][]

保存用户信息的方法:

![ExpandedBlockStart.gif][]

![复制代码][copycode.gif]

// 将用户信息保存到配置文件
        private void saveUserMsg(String msg) {
            // 用户编号
            String id = "";
            // 用户名称
            String name = "";
            // 获得信息数组
            String[] msgs = msg.split(";");
            int idx = msgs[0].indexOf("=");
            id = msgs[0].substring(idx + 1);
            idx = msgs[1].indexOf("=");
            name = msgs[1].substring(idx + 1);
            // 共享信息
            SharedPreferences pre = getSharedPreferences("user_msg",
                    MODE_WORLD_WRITEABLE);
            SharedPreferences.Editor editor = pre.edit();
            editor.putString("id", id);
            editor.putString("name", name);
            editor.commit();
        }

![复制代码][copycode.gif]

记得在Manifest.xml中添加网络权限。

运行效果图：

![13125011-74ba1b97e3984fb9a7f99e5a7e0e52a5.jpg][]![13125028-f314ba5b616b4512a3dac712b8fd7d37.jpg][]

成功后用户信息文件生成位置(data/data文件夹下)与内容：

![13125100-1e9f853df48242a59376c6efc0d104c9.jpg][]

![13125115-d8ca6c1908e048e28a2eda299a8a7390.jpg][]

至此，android与服务器登录通信模块成功实现

[13122221-d2b5a4bf6e2046be9d7e47b21cb93078.jpg]: /images/20220810/e801e72b128a41e4b8d828101303e995.png
[13122728-add007d01af640b3bec4a07b9643f18a.jpg]: /images/20220810/a4052c791fff4ea3b1e211985736931e.png
[ExpandedBlockStart.gif]: /images/20220810/f2ebe4c1ea784d9fba017bb332c6d612.png
[copycode.gif]: /images/20220810/90124983ed174121a1ab3817387f00a1.png
[ContractedBlock.gif]: /images/20220810/3318b51197154ea3a99c5719b55566ee.png
[13125011-74ba1b97e3984fb9a7f99e5a7e0e52a5.jpg]: http://images.cnitblog.com/blog/506703/201305/13125011-74ba1b97e3984fb9a7f99e5a7e0e52a5.jpg
[13125028-f314ba5b616b4512a3dac712b8fd7d37.jpg]: /images/20220810/54e1e0db90cf42d786a7ef390a650e34.png
[13125100-1e9f853df48242a59376c6efc0d104c9.jpg]: /images/20220810/ac98c12cb5b144b38aefef67c3e28d0d.png
[13125115-d8ca6c1908e048e28a2eda299a8a7390.jpg]: /images/20220810/81f8de59b8374f1e86e53c2d619026d9.png