Android与Servlet的互联

手机本地向服务器上传图片

client

package net.onest.androidandservletpractice;import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;public class MainActivity extends AppCompatActivity {/****实例一、  向服务器上上传图片* 所以应该是Android先读取该文件然后使用输出流向服务器端进行输出，所以应该是网络输出流* 那么这个文件应该是Android上的，所以我们应该在data--》data-->code-cache-->创建文件夹--》引入图片* 由于上传图片是一个耗时任务，所以需要使用子线程来完成* 这里我们就是用handle+message的方法** 在说完客户端后我们就需要考虑服务器端了，首先服务器端应该的获取请求* 然后获取文件的输入流，并将其采用输出流输出到本地* @param savedInstanceState*/private Button btnDownPicture;//2.创建handler对象Handler handler = new Handler(Looper.getMainLooper()){@Overridepublic void handleMessage(@NonNull Message msg) {super.handleMessage(msg);switch (msg.what){case 1:Toast.makeText(getApplicationContext(),"上传图片成功",Toast.LENGTH_LONG);break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//1.获得控件idfindViews();//3.给按钮设置点击事件监听器btnDownPicture.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//上传图片upPicture();}});}上传图片private void upPicture() {//4.创建子线程new Thread(){@Overridepublic void run() {super.run();try {//a.获取网络输出流,地址是服务器的地址URL url = new URL("http://you/AndroidAndServlet/uploadimg");HttpURLConnection con = (HttpURLConnection)url.openConnection();//设置在服务器端的请求方式con.setRequestMethod("POST");OutputStream out = con.getOutputStream();//b.读取手机上的图片然后使用网络输出流输出到网络上//得到图片的绝对路径String file = getFilesDir().getAbsolutePath()+"bg.jpg";InputStream in = new FileInputStream(file);int len=0;while ((len=in.read())!=-1){out.write(len);out.flush();}in.close();out.close();//c.上传完成后，让handle处理ui界面Message msg = handler.obtainMessage();msg.what = 1;handler.sendMessage(msg);} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}.start();}//获得控件idprivate void findViews() {btnDownPicture = findViewById(R.id.btn_downpicture);}
}

<?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"tools:context=".MainActivity"android:orientation="vertical"><Buttonandroid:id="@+id/btn_downpicture"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="上传图片" /></LinearLayout>

servlet

 package net.onest.servlet;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** Servlet implementation class UploadImg*/
@WebServlet("/uploadimg")
public class UploadImg extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public UploadImg() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    //1.根据请求获得输入流InputStream in = request.getInputStream();//2.获得输出流，考虑将文件写到位置OutputStream out = new FileOutputStream("F:/copy.jpg");//3.循环写出int len = 0;while((len=in.read())!=-1) {out.write(len);out.flush();}out.close();in.close();}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

从服务器下载文件

client

package net.onest.androidandservletpractice;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;public class DownText extends AppCompatActivity {/*** 示例二、从服务器下载文本到手机并显示* 客户端：所以应该是输入流，将获得到的文本显示在text view框内** 服务器端：采用网络输出流将文件输出* @param savedInstanceState*/private TextView tvDownText;private Button btnDownText;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_down_text);//1.获得控件idfindViews();//2.创建异步类对象btnDownText.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Down down = new Down(getApplicationContext(),tvDownText);down.execute("http://192.168.1.100:8080/AndroidAndServlet/DownloadtextServlet");}});//3.调用方法}//获得控件idprivate void findViews() {tvDownText = findViewById(R.id.tv_dowmText);btnDownText = findViewById(R.id.btn_downText);}
}

package net.onest.androidandservletpractice;import android.content.Context;
import android.os.AsyncTask;
import android.widget.TextView;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;public class Down extends AsyncTask<String,Void,String> {private  Context context;private TextView tvDownText;private String result;public Down(Context context, TextView tvDownText) {this.context = context;this.tvDownText = tvDownText;}@Overrideprotected String doInBackground(String... strings) {/*** 在该方法内完成下载文件*/try {//1.获得网络输入流URL url = new URL(strings[0]);InputStream in = new FileInputStream(String.valueOf(url));String file = context.getFilesDir()+"/copy.txt";OutputStream out = new FileOutputStream(file);int str=-1;StringBuffer buf = new StringBuffer();while((str=in.read())!=-1){out.write(str);out.flush();buf.append(str+"\n");}in.close();out.close();result = buf.toString();} catch (MalformedURLException | FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return result;}
}

servlet

package net.onest.servlet;import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** Servlet implementation class DownloadtextServlet*/
@WebServlet("/downloadtext")
public class DownloadtextServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public DownloadtextServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1.获取本地输入流InputStream in = new FileInputStream("F:/3.txt");//2.获取本地输出流OutputStream out = response.getOutputStream(); //3.循环读写int len=0;while((len=in.read())!=-1) {out.write(len);out.flush();}in.close();out.close();}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

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Android和servlet的互联

文章目录

Android与Servlet的互联

手机本地向服务器上传图片

client

servlet

从服务器下载文件

client

servlet

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