Android 上传图片实例，java上传图片接口

1、完整上传图片代码方法：

private static final int TIME_OUT = 10*1000;   //超时时间
private static final String CHARSET = "utf-8"; //设置编码

    /*** android上传文件到服务器* @param file  需要上传的文件* @param RequestURL  请求的rul* @return  返回响应的内容*/public static String uploadFile(File file, String RequestURL){String result = null;String  BOUNDARY =  UUID.randomUUID().toString();  //边界标识   随机生成String PREFIX = "--" , LINE_END = "\r\n";String CONTENT_TYPE = "multipart/form-data";   //内容类型try {URL url = new URL(RequestURL);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestProperty("filename",file.getName());//添加头部参数，只有这个key 才可以得到对应的文件conn.setReadTimeout(TIME_OUT);conn.setConnectTimeout(TIME_OUT);conn.setDoInput(true);  //允许输入流conn.setDoOutput(true); //允许输出流conn.setUseCaches(false);  //不允许使用缓存conn.setRequestMethod("POST");  //请求方式conn.setRequestProperty("Charset", CHARSET);  //设置编码conn.setRequestProperty("connection", "keep-alive");conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);conn.setRequestProperty("action", "upload");conn.connect();Log.e("lgq", "re==uploadFile=====" + file.getPath()+"......."+file.getName());if(file!=null){/*** 当文件不为空，把文件包装并且上传*/DataOutputStream dos = new DataOutputStream( conn.getOutputStream());StringBuffer sb = new StringBuffer();
//                sb.append(PREFIX);
//                sb.append(BOUNDARY);
//                sb.append(LINE_END);/*** 这里重点注意：* name里面的值为服务器端需要key   只有这个key 才可以得到对应的文件* filename是文件的名字，包含后缀名的   比如:abc.png*///                sb.append("Content-Disposition: form-data; name=\"img\"; filename=\""+file.getName()+"\""+LINE_END);
//                sb.append("Content-Type: application/octet-stream; charset="+CHARSET+LINE_END);
//                sb.append(LINE_END);dos.write(sb.toString().getBytes());InputStream is = new FileInputStream(file);byte[] bytes = new byte[1024];int len = 0;while((len=is.read(bytes))!=-1){dos.write(bytes, 0, len);}is.close();dos.write(LINE_END.getBytes());byte[] end_data = (PREFIX+BOUNDARY+PREFIX+LINE_END).getBytes();dos.write(end_data);dos.flush();/*** 获取响应码  200=成功* 当响应成功，获取响应的流*/int res = conn.getResponseCode();if(res==200){InputStream input =  conn.getInputStream();
//                    StringBuffer sb1= new StringBuffer();int ss ;byte[] buffer = new byte[1024];StringBuilder builder =new StringBuilder();while((ss=input.read(buffer))!=-1){
//                        sb1.append((char)ss);builder.append(new String(buffer, 0, ss, "UTF-8"));}result = builder.toString();System.out.println(result);}}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return result;}

2、异步请求方法

public class Upload extends AsyncTask<String,Void,String> {File file;public Upload(File file){this.file = file;}@Overrideprotected String doInBackground(String... strings) {return uploadFile(file,strings[0]);}@Overrideprotected void onPostExecute(String s) {super.onPostExecute(s);Log.i("lgq", "re==onPostExecute=====" + s);if(s.contains("succedd")){Toast.makeText(getBaseContext(),"上传成功",Toast.LENGTH_SHORT).show();}else{Toast.makeText(getBaseContext(),"上传失败",Toast.LENGTH_SHORT).show();}}
}

3、选中图片，开始上传图片

String firestrUrl = "http://192.168.0.110:8080/servletDemo/testa?method=lgqservice";
private File compressedImage1File;

new  Upload(compressedImage1File).execute(firestrUrl);

4、手机上传图片到java后台效果

手机选择图片

java创建文件方法

上传成功！！

demo链接：https://download.csdn.net/download/meixi_android/10976495

https://download.csdn.net/download/meixi_android/11006216

在线回复bug:QQ1085220040

附java HttpServlet 上传图片主要方法完整代码实例：

   public void lgqservice(HttpServletRequest request,
           HttpServletResponse response) throws ServletException, IOException {
       String filename = request.getHeader("filename");
       System.out.println("===service进来了====="+ filename);

   List<String> msgList2 = new ArrayList<String>();
       if (request.getContentLength() > 0) {
           InputStream inputStream = null;
           FileOutputStream outputStream = null;
           try {
               inputStream = request.getInputStream();
               // 给新文件拼上时间毫秒，防止重名
               long now = System.currentTimeMillis();
               File file = new File("d:/", "file-" + now + ".png");
               file.createNewFile();

outputStream = new FileOutputStream(file);

               byte temp[] = new byte[1024];
               int size = -1;
               while ((size = inputStream.read(temp)) != -1) { // 每次读取1KB，直至读完
                   outputStream.write(temp, 0, size);
               }
               msgList2.add("succedd成功" );
               okreString = "上传成功";

           } catch (IOException e) {
               msgList2.add("defeated失败" );
               okreString = "上传失败";
           } finally {
               outputStream.close();
               inputStream.close();
           }
       }
       JSONObject result = new JSONObject();
result.put("success", true);
result.put("okstatus",okreString );
System.out.println("FileLoadServlet=====8888==="+result);
       response.getWriter().print(result);
//       response.getWriter().print(formatJsonData("msg", msgList2));
   }