首先Android开发需要两个权限
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />其次，先看服务器是怎么写的 var http = require("http"); var fs = require("fs"); var queryString = require('querystring'); var url = require('url'); var util = require('util'); http.createServer(function (request, response) { // 定义了一个post变量，用于暂存请求体的信息 var post = ''; request.on('data', function (chunk) { post += chunk; }); // 在end事件触发后，通过querystring.parse将post解析为真正的POST请求格式，然后向客户端返回。 request.on('end', function () { post = queryString.parse(post); var base64Data = post.body; var dataBuffer = new Buffer(base64Data, 'base64'); fs.writeFile("D:/"+post.name, dataBuffer, function (err) { if (err) { console.log(err); } else { console.log("保存成功！"); } }); console.log("请求结束" + post.body); response.writeHead(200, {"Content-Type": "text/plain;charset=utf8"}); response.write("请求成功"); response.end(); }); }).listen(8888); console.log("服务器启动"); 然后新建了一个图片转编码的类
package com.example.a5.myapplication; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import sun.misc.BASE64Encoder; public class Imgtest { public String GetImageStr(String path) { String imgFile = path; InputStream in = null; byte[] data = null; try { in = new FileInputStream(imgFile); data = new byte[in.available()]; in.read(data); in.close(); } catch (IOException e) { e.printStackTrace(); } BASE64Encoder encoder = new BASE64Encoder(); return encoder.encode(data); } }其中需要引用这个包BASE64.jar
然后是Android的主要代码，在上一篇的基础上写的
package com.example.a5.myapplication; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.ProtocolException; import java.net.URL; import java.net.URLEncoder; public class MainActivity extends AppCompatActivity { private TextView textView; private String img; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView= (TextView) findViewById(R.id.textview); Button button= (Button) findViewById(R.id.button); String mipath= Environment.getExternalStorageDirectory().getAbsolutePath().toString()+ File.separator+"123.jpg"; img=new Imgtest().GetImageStr(mipath); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { textView.setText("开始请求"); new Thread(new Runnable() { @Override public void run() { HttpURLConnection connection = null; URL url = null; try { url = new URL("http://192.168.50.214:8888"); connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("POST"); connection.setConnectTimeout(8000); connection.setReadTimeout(8000); connection.setRequestProperty("Content-Type","application/json"); OutputStream outputStream=connection.getOutputStream(); BufferedWriter requestBody=new BufferedWriter(new OutputStreamWriter(outputStream)); String str = URLEncoder.encode(img, "UTF-8"); requestBody.write("name=123.jpg&body="+str); requestBody.flush(); requestBody.close(); getResponseJava(connection); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ProtocolException e) { e.printStackTrace(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }).start(); } }); } private void getResponseJava(HttpURLConnection urlConnection) { InputStream in = null; try { in = urlConnection.getInputStream();//响应 } catch (IOException e) { urlConnection.disconnect(); //textView.setText(e.getMessage()); return; } BufferedReader reader = null; try { reader = new BufferedReader(new InputStreamReader(in,"UTF-8")); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } final StringBuilder result = new StringBuilder(); String tmp = null; try { while((tmp = reader.readLine()) != null){ result.append(tmp); } } catch (IOException e) { //textView.setText(e.getMessage()); return; } finally { try { reader.close(); urlConnection.disconnect(); } catch (IOException e) { } } runOnUiThread(new Runnable() { @Override public void run() { textView.setText(result); } }); } } 服务器给出的图是
