从app上传图片到php，再上传到java后端服务器的方法一条龙服务

　　在现在的网络开发中，上传图片类的需求实在是太普通不过了，但是对于怎么样做到上传图片，对于刚开始建立项目的时候，还是有点不知所措的。也许有幸，我们做的项目是之前已经有人写过类似的用例了，那么我们只需要依葫芦画瓢就行了。

　　好好了解下图片上传（文件上传）的方式，对于认知的提升还是有好处的。而且说不定哪天你就有个这样的需求呢，这里是一条龙上传。

　　本文就一个从app到PHP层，再到java层的流程，演译下整个上传图片的流程吧。

一、app端获取用户选择的图片，转化为输入流，上传至PHP前端接口：

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

/**

上传文件到服务器类
/
public class UploadUtil {
private static final String TAG = "uploadFile";
private static final int TIME_OUT = 10 1000; // 超时时间
private static final String CHARSET = "utf-8"; // 设置编码
/**
- Android上传文件到服务端
- @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.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);
 if (file != null) {
 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=\"uploadfile\"; 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();
 InputStream input = conn.getInputStream();
 StringBuffer sb1 = new StringBuffer();
 int ss;
 while ((ss = input.read()) != -1) {
 sb1.append((char) ss);
 }
 result = sb1.toString();
 }
 } catch (MalformedURLException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 }
 return result;
 }
 /**
- 通过拼接的方式构造请求内容，实现参数传输以及文件传输
- @param url Service net address
- @param params text content
- @param files pictures
- @return String result of Service response
- @throws IOException
 /
 public static String post(String url,Map<String,String> params,File> files)
 throws IOException {
 String BOUNDARY = UUID.randomUUID().toString();
 String PREFIX = "--",LINEND = "\r\n";
 String MULTIPART_FROM_DATA = "multipart/form-data";
 String CHARSET = "UTF-8";
 URL uri = new URL(url);
 HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
 conn.setReadTimeout(10 1000); // 缓存的最长时间
 conn.setDoInput(true); // 允许输入
 conn.setDoOutput(true); // 允许输出
 conn.setUseCaches(false); // 不允许使用缓存
 conn.setRequestMethod("POST");
 conn.setRequestProperty("connection","keep-alive");
 conn.setRequestProperty("Charsert","UTF-8");
 conn.setRequestProperty("Content-Type",MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);
 // 首先组拼文本类型的参数
 StringBuilder sb = new StringBuilder();
 for (Map.Entry<String,String> entry : params.entrySet()) {
 sb.append(PREFIX);
 sb.append(BOUNDARY);
 sb.append(LINEND);
 sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
 sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
 sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
 sb.append(LINEND);
 sb.append(entry.getValue());
 sb.append(LINEND);
 }
 DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
 outStream.write(sb.toString().getBytes());
 // 发送文件数据
 if (files != null)
 for (Map.Entry<String,File> file : files.entrySet()) {
 StringBuilder sb1 = new StringBuilder();
 sb1.append(PREFIX);
 sb1.append(BOUNDARY);
 sb1.append(LINEND);
 sb1.append("Content-Disposition: form-data; name=\"uploadfile\"; filename=\""
 - file.getValue().getName() + "\"" + LINEND);
 sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
 sb1.append(LINEND);
 outStream.write(sb1.toString().getBytes());
 InputStream is = new FileInputStream(file.getValue());
 byte[] buffer = new byte[1024];
 int len = 0;
 while ((len = is.read(buffer)) != -1) {
 outStream.write(buffer,len);
 }
 is.close();
 outStream.write(LINEND.getBytes());
 }
 byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
 outStream.write(end_data);
 outStream.flush();
 int res = conn.getResponseCode();
 InputStream in = conn.getInputStream();
 StringBuilder sb2 = new StringBuilder();
 if (res == 200) {
 int ch;
 while ((ch = in.read()) != -1) {
 sb2.append((char) ch);
 }
 }
 outStream.close();
 conn.disconnect();
 return sb2.toString();
 }
 // 测试
 public static void main(String[] args) throws IOException {
 String requestURL = "sss";
 final Map<String,String> params = new HashMap<String,String>();
 params.put("send_userId",String.valueOf(1));
 params.put("send_email","ss@ss.com");
 final Map<String,File> files = new HashMap<String,File>();
 files.put("uploadfile",new File("/var/data/de.jpg"));
 final String result = UploadUtil.post(requestURL,params,files);
 System.out.println("result is: " + result);
 }
 }

二、PHP服务端接收文件，临时保存并继续上传至java后端：

　　1. 接收文件类

PHP namespace App\Controller;

use Action\RestAction;
use Api\UploadApi;

class UserController extends RestAction
{
/

用户头像上传
*/
public function set_avatar_post($code)
{
$uploadApi = new UploadApi();
$res = $uploadApi->uploads('avatar');
$filename = $res['data'];

$result = $uploadApi->uploadAvatar($code,$filename);
@unlink($filename); //删除图片
if (!$result['status']) {
$this->response($result);
}
$avatar = A("Personal","Api")->getAvatar($code);
$this->response($avatar);
}
}

　　2. 上传类

PHP namespace Api\Action;

class UploadApi
{
public function __construct()
{
//...
 }

</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;function</span> curlGet(<span style="color: #800080"&gt;$url</span>,<span style="color: #800080"&gt;$param</span> = <span style="color: #0000ff"&gt;array</span>(),<span style="color: #800080"&gt;$timeout</span> = 30,<span style="color: #800080"&gt;$ajaxResponseImmediately</span> = <span style="color: #0000ff"&gt;true</span><span style="color: #000000"&gt;)
{
    </span><span style="color: #800080"&gt;$opts</span> = <span style="color: #0000ff"&gt;array</span><span style="color: #000000"&gt;(
        CURLOPT_TIMEOUT </span>=> <span style="color: #800080"&gt;$timeout</span>,<span style="color: #000000"&gt;
        CURLOPT_RETURNTRANSFER </span>=> 1,<span style="color: #000000"&gt;
        CURLOPT_SSL_VERIFYPEER </span>=> <span style="color: #0000ff"&gt;false</span>,<span style="color: #000000"&gt;
        CURLOPT_SSL_VERIFYHOST </span>=> <span style="color: #0000ff"&gt;false</span>,<span style="color: #000000"&gt;
        CURLOPT_HTTPHEADER </span>=> <span style="color: #800080"&gt;$header</span><span style="color: #000000"&gt;
    );
    </span><span style="color: #0000ff"&gt;switch</span> (<span style="color: #008080"&gt;strtoupper</span>(<span style="color: #800080"&gt;$method</span><span style="color: #000000"&gt;)) {
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; case 'POST':
            // $opts[CURLOPT_URL] = $url;
            // $opts[CURLOPT_POST] = 1;
            // $opts[CURLOPT_POSTFIELDS] = $param;
            // break;</span>
        <span style="color: #0000ff"&gt;default</span>:
            <span style="color: #800080"&gt;$opts</span>[CURLOPT_URL] = <span style="color: #800080"&gt;$url</span> . '?' . <span style="color: #008080"&gt;http_build_query</span>(<span style="color: #800080"&gt;$param</span><span style="color: #000000"&gt;);
            </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
    }

    </span><span style="color: #800080"&gt;$ch</span> =<span style="color: #000000"&gt; curl_init();
    curl_setopt_array(</span><span style="color: #800080"&gt;$ch</span>,<span style="color: #800080"&gt;$opts</span><span style="color: #000000"&gt;);
    </span><span style="color: #800080"&gt;$result</span> = curl_exec(<span style="color: #800080"&gt;$ch</span><span style="color: #000000"&gt;);

    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt;记录请求日志</span>
    curl_close(<span style="color: #800080"&gt;$ch</span><span style="color: #000000"&gt;);
    </span><span style="color: #0000ff"&gt;return</span> <span style="color: #800080"&gt;$result</span><span style="color: #000000"&gt;;
}

</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;function</span> curlPost(<span style="color: #800080"&gt;$url</span>,<span style="color: #000000"&gt;
        CURLOPT_HTTPHEADER </span>=> <span style="color: #800080"&gt;$header</span><span style="color: #000000"&gt;
    );
    </span><span style="color: #0000ff"&gt;switch</span> (<span style="color: #008080"&gt;strtoupper</span>(<span style="color: #800080"&gt;$method</span><span style="color: #000000"&gt;)) {
        </span><span style="color: #0000ff"&gt;case</span> 'POST':
        <span style="color: #0000ff"&gt;default</span>:
            <span style="color: #800080"&gt;$opts</span>[CURLOPT_URL] = <span style="color: #800080"&gt;$url</span><span style="color: #000000"&gt;;
            </span><span style="color: #800080"&gt;$opts</span>[CURLOPT_POST] = 1<span style="color: #000000"&gt;;
            </span><span style="color: #800080"&gt;$opts</span>[CURLOPT_POSTFIELDS] = <span style="color: #800080"&gt;$param</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; $opts[CURLOPT_URL] = $url . '?' . http_build_query($param);
            // break;</span>

}

    </span><span style="color: #800080"&gt;$ch</span> =<span style="color: #000000"&gt; curl_init();
    curl_setopt_array(</span><span style="color: #800080"&gt;$ch</span>,<span style="color: #800080"&gt;$opts</span><span style="color: #000000"&gt;);
    </span><span style="color: #800080"&gt;$result</span> = curl_exec(<span style="color: #800080"&gt;$ch</span><span style="color: #000000"&gt;);

    </span><span style="color: #800080"&gt;$log_data</span>['result'] = <span style="color: #800080"&gt;$result</span><span style="color: #000000"&gt;;
    </span><span style="color: #0000ff"&gt;if</span> (!<span style="color: #0000ff"&gt;empty</span>(<span style="color: #800080"&gt;$param</span>)) <span style="color: #800080"&gt;$log_data</span>['param'] = <span style="color: #800080"&gt;$param</span><span style="color: #000000"&gt;;
    curl_close(</span><span style="color: #800080"&gt;$ch</span><span style="color: #000000"&gt;);
    </span><span style="color: #0000ff"&gt;return</span> <span style="color: #800080"&gt;$result</span><span style="color: #000000"&gt;;
}

</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;function</span> uploads(<span style="color: #800080"&gt;$param</span> = ''<span style="color: #000000"&gt;)
{
    </span><span style="color: #0000ff"&gt;if</span> (<span style="color: #800080"&gt;$param</span> == ''<span style="color: #000000"&gt;) {
        </span><span style="color: #800080"&gt;$param</span> = 'imgFile'<span style="color: #000000"&gt;;
    }
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; <a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>保存目录路径</span>
    <span style="color: #800080"&gt;$save_url</span> = <span style="color: #008080"&gt;dirname</span>(<span style="color: #008080"&gt;dirname</span>(<span style="color: #008080"&gt;dirname</span>(<span style="color: #ff00ff"&gt;__FILE__</span>))) . DIRECTORY_SEPARATOR . "Uploads" .<span style="color: #000000"&gt; DIRECTORY_SEPARATOR;
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 定义允许<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a>的<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>扩展名</span>
    <span style="color: #800080"&gt;$ext_arr</span> = <span style="color: #0000ff"&gt;array</span><span style="color: #000000"&gt;(
        </span>'image' => <span style="color: #0000ff"&gt;array</span>('gif','jpg','jpeg','png','bmp'),<span style="color: #000000"&gt;
    );
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 最大<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>大小</span>
    <span style="color: #800080"&gt;$max_size</span> = 20 * 1024<span style="color: #000000"&gt;;
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; <a href="https://www.jb51.cc/tag/PHP/" target="_blank" class="keywords">PHP</a><a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a>失败</span>
    <span style="color: #0000ff"&gt;if</span> (!<span style="color: #0000ff"&gt;empty</span> (<span style="color: #800080"&gt;$_FILES</span> [<span style="color: #800080"&gt;$param</span>] ['error'<span style="color: #000000"&gt;])) {
        </span><span style="color: #0000ff"&gt;switch</span> (<span style="color: #800080"&gt;$_FILES</span> [<span style="color: #800080"&gt;$param</span>] ['error'<span style="color: #000000"&gt;]) {
            </span><span style="color: #0000ff"&gt;case</span> '1' :
                <span style="color: #800080"&gt;$error</span> = '超过<a href="https://www.jb51.cc/tag/PHP/" target="_blank" class="keywords">PHP</a>.ini允许的大小。'<span style="color: #000000"&gt;;
                </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;case</span> '2' :
                <span style="color: #800080"&gt;$error</span> = '超过表单允许的大小。'<span style="color: #000000"&gt;;
                </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;case</span> '3' :
                <span style="color: #800080"&gt;$error</span> = '<a href="https://www.jb51.cc/tag/tupian/" target="_blank" class="keywords">图片</a>只有部分被<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a>。'<span style="color: #000000"&gt;;
                </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;case</span> '4' :
                <span style="color: #800080"&gt;$error</span> = '请选择<a href="https://www.jb51.cc/tag/tupian/" target="_blank" class="keywords">图片</a>。'<span style="color: #000000"&gt;;
                </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;case</span> '6' :
                <span style="color: #800080"&gt;$error</span> = '找不到临时目录。'<span style="color: #000000"&gt;;
                </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;case</span> '7' :
                <span style="color: #800080"&gt;$error</span> = '写<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>到硬盘出错。'<span style="color: #000000"&gt;;
                </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;case</span> '8' :
                <span style="color: #800080"&gt;$error</span> = 'File upload stopped by extension。'<span style="color: #000000"&gt;;
                </span><span style="color: #0000ff"&gt;break</span><span style="color: #000000"&gt;;
            </span><span style="color: #0000ff"&gt;case</span> '999' :
            <span style="color: #0000ff"&gt;default</span> :
                <span style="color: #800080"&gt;$error</span> = '未知<a href="https://www.jb51.cc/tag/cuowu/" target="_blank" class="keywords">错误</a>。'<span style="color: #000000"&gt;;
        }
        </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '0','error' => '111111','msg' => <span style="color: #800080"&gt;$error</span><span style="color: #000000"&gt;);

    }
    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 有<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a><a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>时</span>
    <span style="color: #0000ff"&gt;if</span> (<span style="color: #0000ff"&gt;empty</span> (<span style="color: #800080"&gt;$_FILES</span>) === <span style="color: #0000ff"&gt;false</span><span style="color: #000000"&gt;) {
        </span><span style="color: #800080"&gt;$file_name</span> = <span style="color: #800080"&gt;$_FILES</span> [<span style="color: #800080"&gt;$param</span>] ['name'];<span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 原<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>名</span>
        <span style="color: #800080"&gt;$tmp_name</span> = <span style="color: #800080"&gt;$_FILES</span> [<span style="color: #800080"&gt;$param</span>] ['tmp_name'];<span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 服务器上临时<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>名</span>
        <span style="color: #800080"&gt;$file_size</span> = <span style="color: #800080"&gt;$_FILES</span> [<span style="color: #800080"&gt;$param</span>] ['size'];<span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; <a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>大小
        // 检查<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>名</span>
        <span style="color: #0000ff"&gt;if</span> (!<span style="color: #800080"&gt;$file_name</span><span style="color: #000000"&gt;) {
            </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '0','msg' => '请选择<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>'<span style="color: #000000"&gt;);
        }
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 检查是否已<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a></span>
        <span style="color: #0000ff"&gt;if</span> (@<span style="color: #008080"&gt;is_uploaded_file</span>(<span style="color: #800080"&gt;$tmp_name</span>) === <span style="color: #0000ff"&gt;false</span><span style="color: #000000"&gt;) {
            </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '0','msg' => '<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a>失败'<span style="color: #000000"&gt;);
        }
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 检查<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>大小</span>
        <span style="color: #0000ff"&gt;if</span> (<span style="color: #800080"&gt;$file_size</span> > <span style="color: #800080"&gt;$max_size</span><span style="color: #000000"&gt;) {
            </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '0','msg' => ''<span style="color: #000000"&gt;);
        }
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 检查目录名</span>
        <span style="color: #800080"&gt;$dir_name</span> = <span style="color: #0000ff"&gt;empty</span> (<span style="color: #800080"&gt;$_GET</span> ['dir']) ? 'image' : <span style="color: #008080"&gt;trim</span>(<span style="color: #800080"&gt;$_GET</span> ['dir'<span style="color: #000000"&gt;]);
        </span><span style="color: #0000ff"&gt;if</span> (<span style="color: #0000ff"&gt;empty</span> (<span style="color: #800080"&gt;$ext_arr</span> [<span style="color: #800080"&gt;$dir_name</span><span style="color: #000000"&gt;])) {
            </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '0','msg' => '目录名不正确'<span style="color: #000000"&gt;);
        }
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 获得<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>扩展名</span>
        <span style="color: #800080"&gt;$temp_arr</span> = <span style="color: #008080"&gt;explode</span>('.',<span style="color: #800080"&gt;$file_name</span><span style="color: #000000"&gt;);
        </span><span style="color: #800080"&gt;$file_ext</span> = <span style="color: #008080"&gt;array_pop</span>(<span style="color: #800080"&gt;$temp_arr</span><span style="color: #000000"&gt;);
        </span><span style="color: #800080"&gt;$file_ext</span> = <span style="color: #008080"&gt;trim</span>(<span style="color: #800080"&gt;$file_ext</span><span style="color: #000000"&gt;);
        </span><span style="color: #800080"&gt;$file_ext</span> = <span style="color: #008080"&gt;strtolower</span>(<span style="color: #800080"&gt;$file_ext</span><span style="color: #000000"&gt;);
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 检查扩展名</span>
        <span style="color: #0000ff"&gt;if</span> (<span style="color: #008080"&gt;in_array</span>(<span style="color: #800080"&gt;$file_ext</span>,<span style="color: #800080"&gt;$ext_arr</span> [<span style="color: #800080"&gt;$dir_name</span>]) === <span style="color: #0000ff"&gt;false</span><span style="color: #000000"&gt;) {
            </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '0','msg' => '<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a><a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>扩展名是不允许的扩展名'<span style="color: #000000"&gt;);
        }
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 创建<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>夹</span>
        <span style="color: #0000ff"&gt;if</span> (<span style="color: #800080"&gt;$dir_name</span> !== ''<span style="color: #000000"&gt;) {
            </span><span style="color: #0000ff"&gt;if</span> (!<span style="color: #008080"&gt;file_exists</span>(<span style="color: #800080"&gt;$save_url</span><span style="color: #000000"&gt;)) {
                </span><span style="color: #008080"&gt;mkdir</span>(<span style="color: #800080"&gt;$save_url</span><span style="color: #000000"&gt;);
            }
        }
        </span><span style="color: #800080"&gt;$new_file_name</span> = <span style="color: #008080"&gt;date</span>('YmdHis') . '_' . <span style="color: #008080"&gt;rand</span>(10000,99999) . '.' . <span style="color: #800080"&gt;$file_ext</span><span style="color: #000000"&gt;;
        </span><span style="color: #800080"&gt;$file_path</span> = <span style="color: #800080"&gt;$save_url</span> . <span style="color: #800080"&gt;$new_file_name</span><span style="color: #000000"&gt;;
        </span><span style="color: #0000ff"&gt;if</span> (<span style="color: #008080"&gt;move_uploaded_file</span>(<span style="color: #800080"&gt;$tmp_name</span>,<span style="color: #800080"&gt;$file_path</span>) === <span style="color: #0000ff"&gt;false</span><span style="color: #000000"&gt;) {
            </span><span style="color: #800080"&gt;$result</span>['msg'] = '<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a><a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>失败'<span style="color: #000000"&gt;;
            </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '0','msg' => '<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a><a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>失败'<span style="color: #000000"&gt;);
        } </span><span style="color: #0000ff"&gt;else</span><span style="color: #000000"&gt; {
            </span><span style="color: #800080"&gt;$result</span> = <span style="color: #0000ff"&gt;array</span>('status' => '1','error' => '000000','data' => <span style="color: #800080"&gt;$file_path</span><span style="color: #000000"&gt;);
        }
        @</span><span style="color: #008080"&gt;chmod</span>(<span style="color: #800080"&gt;$file_path</span>,0644<span style="color: #000000"&gt;);
        </span><span style="color: #0000ff"&gt;return</span> <span style="color: #800080"&gt;$result</span><span style="color: #000000"&gt;;
    }
}

</span><span style="color: #0000ff"&gt;public</span> <span style="color: #0000ff"&gt;function</span> uploadAvatar(<span style="color: #800080"&gt;$code</span>,<span style="color: #800080"&gt;$avatarImageName</span><span style="color: #000000"&gt;) {
    </span><span style="color: #800080"&gt;$url</span> = <span style="color: #800080"&gt;$this</span>->getApiUrl(<span style="color: #ff00ff"&gt;__METHOD__</span><span style="color: #000000"&gt;);
    </span><span style="color: #800080"&gt;$data</span> = <span style="color: #0000ff"&gt;array</span><span style="color: #000000"&gt;(
        </span>"code" => <span style="color: #800080"&gt;$code</span>,"ip" => <span style="color: #800080"&gt;$this</span>->params['ip'],"avatar" => !<span style="color: #0000ff"&gt;empty</span>(<span style="color: #800080"&gt;$avatarImageName</span>) ? '@' . <span style="color: #800080"&gt;$avatarImageName</span> : '',<span style="color: #000000"&gt;
    );
    </span><span style="color: #800080"&gt;$result</span> = <span style="color: #800080"&gt;$this</span>->curlPost(<span style="color: #800080"&gt;$url</span>,<span style="color: #800080"&gt;$data</span><span style="color: #000000"&gt;);
    </span><span style="color: #0000ff"&gt;return</span> <span style="color: #800080"&gt;$result</span><span style="color: #000000"&gt;;
}

}

　　这样，PHP就已经接收到了来自客户端的图片上传了，并且已经上传到java后端服务器。

　　注意：这里有个坑，即PHP版本大于5.6以后，直接使用 @ 符号无法上传文件了，需要加上一个安全选项：CURLOPT_SAFE_UPLOAD => false 才可以，或者使用5.6以的高级上传类上传文件：

,CURLOPT_POSTFIELDS,'file' => CURLFile(('image.png')),

三、java后端接收PHP 上传的图片

import com.xx.core.pojo.Constants;
import com.xx.core.pojo.MicroException;
import com.xx.core.pojo.ResponseEntity;
import com.xx.core.web.spring.bind.annotation.ClientIP;
import com.xx.core.web.spring.bind.annotation.SessionUserId;
import com.xx.c.pojo.user.UpFileUrlBean;
import com.xx.c.service.user.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.Iterator;

@Controller
@RequestMapping(value = "upload")
public class UploadAction {

@Resource(name </span>= "userService"<span style="color: #000000"&gt;)
</span><span style="color: #0000ff"&gt;private</span><span style="color: #000000"&gt; UserService userService;

@RequestMapping(value </span>= "/uploadAvatar",method = RequestMethod.POST,produces = "application/json"<span style="color: #000000"&gt;)
@ResponseBody
</span><span style="color: #0000ff"&gt;public</span><span style="color: #000000"&gt; Object uploadAvatar(@RequestParam String code,@ClientIP String addIp,@SessionUserId Long userId,<a href="https://www.jb51.cc/tag/modelattribute/" target="_blank" class="keywords">@modelattribute</a> UpFileUrlBean bean,HttpServletRequest request) </span><span style="color: #0000ff"&gt;throws</span><span style="color: #000000"&gt; MicroException {
    bean.setAddIp(addIp);
    bean.setUserId(userId);

    </span><span style="color: #0000ff"&gt;try</span><span style="color: #000000"&gt; {
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 转型为MultipartHttpRequest：</span>
        MultipartHttpServletRequest multipartRequest =<span style="color: #000000"&gt; (MultipartHttpServletRequest) request;
        </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt; 从其中取出一个<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a> 后续可使用spring <a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a><a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a><a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>：file.transferTo(destFile);</span>
        MultipartFile file = <span style="color: #0000ff"&gt;null</span><span style="color: #000000"&gt;;
        </span><span style="color: #0000ff"&gt;for</span> (Iterator<String> it =<span style="color: #000000"&gt; multipartRequest.getFileNames(); it.hasNext();) {
            file </span>=<span style="color: #000000"&gt; multipartRequest.getFile((String) it.next());
        }
        userService.uploadAvatar(file,bean);
    } </span><span style="color: #0000ff"&gt;catch</span><span style="color: #000000"&gt; (Exception e) {
        </span><span style="color: #0000ff"&gt;throw</span> <span style="color: #0000ff"&gt;new</span><span style="color: #000000"&gt; MicroException(Constants.ErrCode.UPLOAD_AVATAR_TO_SERVER_<a href="https://www.jb51.cc/tag/Failed/" target="_blank" class="keywords">Failed</a>,Constants.ErrMsg.UPLOAD_AVATAR_TO_SERVER_<a href="https://www.jb51.cc/tag/Failed/" target="_blank" class="keywords">Failed</a>,e);
    }

    ResponseEntity ret </span>= <span style="color: #0000ff"&gt;new</span><span style="color: #000000"&gt; ResponseEntity(Constants.System.OK);
    </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; ret;
}

}

　　至此，上传流程已经完成了。（当然，后续还可能使用其他上传，比如dubbo调用文件系统上传文件，调用第三方sdk上传到文件服务器。。。，原理大抵一样，使用字节流进行传输，然后读取出来存储到文件）

　　一般为app写的接口中，都会涉及到加解密问题，此时，文件不应该算作加密的范畴，而应单独给一个字段。

原文链接：https://www.f2er.com/php/74357.html

从app上传图片到php，再上传到java后端服务器的方法一条龙服务

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