Android_Android与Web端的数据交互

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WEB登录逻辑处理：

package com.zking.Servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet{
   @Override
   protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       // TODO Auto-generated method stub
   //   super.service(arg0, arg1);
       String uname=req.getParameter("uname");
       String upass=req.getParameter("upass");
       String result="";
       if ("admin".equals(uname) && "123".equals(upass)) {
           result="success";
       }else{
           result="fail";
       }
       resp.getWriter().write(result);
   }

}

Web.xml配置Servler:

<servlet>
   <servlet-name>loginServlet</servlet-name>
   <servlet-class>com.zking.Servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
   <servlet-name>loginServlet</servlet-name>
   <url-pattern>/login.do</url-pattern>
</servlet-mapping>

Android登录布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.android_webandandroid.MainActivity">    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="请输入帐号"        android:id="@+id/et_mian_uname"/>    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="请输入密码"        android:id="@+id/et_mian_upass"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="通过get方式提交"        android:onClick="loginGet"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="通过post方式提交"        android:onClick="loginPost"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="通过AsyncHttpClient方式提交"        android:onClick="loginAsyncHttpClient"/></LinearLayout>

Activity代码：

package com.example.android_webandandroid;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.RequestParams;import com.loopj.android.http.ResponseHandlerInterface;import com.loopj.android.http.TextHttpResponseHandler;import org.apache.http.Header;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;public class MainActivity extends AppCompatActivity {    private EditText et_mian_uname;    private EditText et_mian_upass;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        et_mian_uname = (EditText) findViewById(R.id.et_mian_uname);        et_mian_upass = (EditText) findViewById(R.id.et_mian_upass);    }//通过谷歌的第三方//需要导入jar包：android-async-http-1.4.4.jar//以及类库：useLibrary 'org.apache.http.legacy'


 public void loginAsyncHttpClient(View view){        String uname=et_mian_uname.getText().toString();        String upass=et_mian_upass.getText().toString();        String path="http://193.168.3.53:8080/G160628_ServletForAndroid/login.do";        AsyncHttpClient ahc=new AsyncHttpClient();        RequestParams rp=new RequestParams();        rp.put("uname",uname);        rp.put("upass",upass);        ahc.post(MainActivity.this, path, rp, new TextHttpResponseHandler() {            @Override            public void onFailure(int statusCode, Header[] headers, String responseBody, Throwable error) {                super.onFailure(statusCode, headers, responseBody, error);            }            @Override            public void onSuccess(int statusCode, Header[] headers, String responseBody) {                super.onSuccess(statusCode, headers, responseBody);                Toast.makeText(MainActivity.this, responseBody, Toast.LENGTH_SHORT).show();            }        });    }    public void loginPost(View view){        String uname=et_mian_uname.getText().toString();        String upass=et_mian_upass.getText().toString();

        //path为网络中逻辑层的路径，需要在局域网中，可以在控制面板中输入ipconfig获取IPv4 地址
       String path="http://193.168.3.53:8080/G160628_ServletForAndroid/login.do";

      new MyPostTask().execute(uname,upass,path);    }    class MyPostTask extends AsyncTask{        @Override        protected Object doInBackground(Object[] objects) {            String uname=objects[0].toString();            String upass=objects[1].toString();            String path=objects[2].toString();            try {                URL url=new URL(path);                HttpURLConnection coon= (HttpURLConnection) url.openConnection();                coon.setRequestMethod("POST");                coon.setConnectTimeout(5000);                //uname与upass的名称必须与web端保持一致
                String s="uname="+uname+"&upass="+upass;                //添加请求头                coon.setRequestProperty("Content-Length",s.length()+"");                coon.setRequestProperty("Content-Type","application/x-www-form-urlencoded");                coon.setDoOutput(true);//允许对外输出数据                OutputStream os=coon.getOutputStream();                os.write(s.getBytes());                if (coon.getResponseCode()==200){                    InputStream is=coon.getInputStream();                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    String str=br.readLine();                    return str;                }            } catch (Exception e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            String s= (String) o;            Toast.makeText(MainActivity.this,s, Toast.LENGTH_SHORT).show();        }    }    public void loginGet(View view){        String uname=et_mian_uname.getText().toString();        String upass=et_mian_upass.getText().toString();        String path="http://193.168.3.53:8080/G160628_ServletForAndroid/login.do";        new MyGetTask().execute(uname,upass,path);    }    class MyGetTask extends AsyncTask{        @Override        protected Object doInBackground(Object[] objects) {            String uname=objects[0].toString();            String upass=objects[1].toString();            String path=objects[2].toString();            try {
                //uname与upass的名称必须与web端保持一致              
               URL url=new URL(path+"?uname="+uname+"&upass="+upass);                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                connection.setRequestMethod("GET");                connection.setConnectTimeout(5000);                if (connection.getResponseCode()==200){                    InputStream is=connection.getInputStream();                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    String s=br.readLine();                    return s;                }            } catch (Exception e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            String s= (String) o;            Toast.makeText(MainActivity.this,s, Toast.LENGTH_SHORT).show();        }    }}

Android网络权限：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

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