android向web传输数据

妖狐艹你老母 2022-06-11 02:19 214阅读 0赞

这次分享的内容属于网络编程，android端向服务器提交数据。

下面给大家介绍三种提交的方式：GET、POST以及第三方的AsyncHttpClient提交

现在给大家上一些比较简单的示例代码：

web端：

<%@ page language="java" contentType="text/html; charset=UTf-8"
        pageEncoding="UTf-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTf-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<h1>登录页面</h1>
    	<form action="login.do" method="post">
    		用户名：<input type="text" name="uname"/><br/>
    		密码：<input type="password" name="upass"/><br/>
    		<input type="submit" value="登录"/><br/>
    	</form>
    </body>
    </html>

LoginServlet：

package com.zking.servlet;
    
    import java.awt.print.Printable;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    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 doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		//获取用户名和密码
    		String uname=req.getParameter("uname");
    		String upass=req.getParameter("upass");
    		System.out.println(uname+" "+upass);
    		String result=null;
    		//判断
    		if("admin".equals(uname) && "123".equals(upass)){
    			result="success";
    		}else{
    			result="fail";
    		}
    		PrintWriter pw=resp.getWriter();
    		pw.write(result);
    		pw.close();
    	}
    }

android端：

activity\_main.xml:

<?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:orientation="vertical"
        android:layout_height="match_parent">
    
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入用户名"
            android:id="@+id/et_main_uname"
            />
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入密码"
            android:id="@+id/et_main_upass"
            />
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="登录(GET)"
            android:onClick="loginGet"
            />
    <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="登录(Post)"
            android:onClick="loginPost"
            />
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="登录(AsyncHttpClient)"
            android:onClick="loginAsyncHttpClient"
            />
    </LinearLayout>

MainActivity:

package com.zking.administrator.g160628_android32_commitdata;
    
    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.TextHttpResponseHandler;
    
    import org.apache.http.Header;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    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_main_uname;
        private EditText et_main_upass;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            et_main_uname = (EditText) findViewById(R.id.et_main_uname);
            et_main_upass = (EditText) findViewById(R.id.et_main_upass);
        }
        public void loginGet(View view){
           String uname=et_main_uname.getText().toString();
           String upass=et_main_upass.getText().toString();
           String path="http://193.168.2.141:7788/G160628_Server/login.do";
          new MyGetTask().execute(uname,upass,path);
        }
        public void loginAsyncHttpClient(View view){
            String uname=et_main_uname.getText().toString();
            String upass=et_main_upass.getText().toString();
            String path="http://193.168.2.141:7788/G160628_Server/login.do";
    
            AsyncHttpClient ahc=new AsyncHttpClient();
            RequestParams params=new RequestParams();
            params.put("uname",uname);
            params.put("upass",upass);
            ahc.post(this,path,params,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_main_uname.getText().toString();
           String upass=et_main_upass.getText().toString();
           String path="http://193.168.2.141:7788/G160628_Server/login.do";
          new MyPostTask().execute(uname,upass,path);
        }
    
        class MyPostTask extends AsyncTask{
    
            @Override
            protected Object doInBackground(Object[] params) {
                String uname=params[0].toString();
                String upass=params[1].toString();
                String path=params[2].toString();
                try {
                    URL url=new URL(path);
                    HttpURLConnection conn= (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("POST");
                    conn.setConnectTimeout(5000);
    
                    //admin 123
                    //uname=admin&upass=123456
    
                    String s="uname="+uname+"&upass="+upass;
                     //添加请求头
                    conn.setRequestProperty("Content-Length",s.length()+"");
                    conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
    
                    conn.setDoOutput(true);//允许对外输出数据
    
                    OutputStream os=conn.getOutputStream();
                    os.write(s.getBytes());
    
                    if(conn.getResponseCode()==200){
                        InputStream is=conn.getInputStream();
                        BufferedReader br=new BufferedReader(new InputStreamReader(is));
                        String str=br.readLine();
                        return str;
                    }
    
    
    
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException 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();
    
            }
        }
    
    
    
    
    
    
    
    
    
        class MyGetTask extends AsyncTask{
            @Override
            protected Object doInBackground(Object[] params) {
                String uname=params[0].toString();
                String upass=params[1].toString();
                String path=params[2].toString();
    
                try {
                    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 (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException 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();
            }
        }
    
    
    
    }

还要加上网络权限：

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.zking.administrator.g160628_android32_commitdata">
    
        <uses-permission android:name="android.permission.INTERNET"></uses-permission>
        <application android:allowBackup="true" android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true" android:theme="@style/AppTheme">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>