Android将图上以base64编码的格式上传到node.js服务器并保存

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