android上传图片到javaweb服务端，android+和struts2

客户端代码：

HttpAssist.java

package com.sevnce.apps.phone.modelall.actionall;import java.io.BufferedReader;  import java.io.DataOutputStream;  import java.io.File;  import java.io.FileInputStream;  import java.io.IOException;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.io.OutputStream;  import java.net.HttpURLConnection;  import java.net.MalformedURLException;  import java.net.URL;  import java.util.UUID;  import org.apache.http.HttpVersion;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.FileEntity;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.params.CoreProtocolPNames;    public class HttpAssist {      private static final String TAG = "uploadFile";      private static final int TIME_OUT = 10 * 10000000; // 超时时间      private static final String CHARSET = "utf-8"; // 设置编码      public static final String SUCCESS = "1";      public static final String FAILURE = "0";        public static String uploadFile(File file) {          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          String RequestURL = "http://localhost:8080/phone/phone_account!updateUserInfo.do?userId=7&updateType=headPhoto";          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) {                  /**                  * 当文件不为空，把文件包装并且上传                  */                  OutputStream outputSteam = conn.getOutputStream();                    DataOutputStream dos = new DataOutputStream(outputSteam);                  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=\"headPhotoUrl\"; 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) {                      return SUCCESS;                  }              }          } catch (MalformedURLException e) {              e.printStackTrace();          } catch (IOException e) {              e.printStackTrace();          }          return FAILURE;      }              public static void main(String[] args) {File file = new File("C:/Users/sevnce/Desktop/QQ图片20170206211126.png");if(!file.exists()){System.out.println( "图片不存在");}HttpAssist.uploadFile(file);}     }  

Javaweb服务端代码：

@Overridepublic String uploadHeadPhoto(HttpServletRequest request) {// 文件保存目录路径String savePath = request.getSession().getServletContext().getRealPath("/") + "images/headPhoto/";// 文件保存目录URLString saveUrl = request.getContextPath() + "/images/headPhoto/";// 最大文件大小long maxSize = 1000000;// Struts2 请求 包装过滤器MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) request;// 获取上传文件名String fileName = wrapper.getFileNames("headPhotoUrl")[0];// 获得文件过滤器File file = wrapper.getFiles("headPhotoUrl")[0];// 得到上传文件的扩展名String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();// 检查文件大小if (file.length() > maxSize) {return null;}// 检查目录File uploadDir = new File(savePath);if (!uploadDir.isDirectory()) {//ajaxPri(getError("上传目录不存在。"));//return null;uploadDir.mkdirs();}// 检查目录写入权限if (!uploadDir.canWrite()) {return null;}// 重构上传图片的名称SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");String newImgName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;// 设置 KE 中的图片文件地址String newFileName = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + saveUrl + newImgName;byte[] buffer = new byte[1024];FileOutputStream fos = null;InputStream in = null;try {// 获取文件输出流fos = new FileOutputStream(savePath + newImgName);// 获取内存中当前文件输入流in = new FileInputStream(file);int num = 0;while ((num = in.read(buffer)) > 0) {fos.write(buffer, 0, num);}} catch (Exception e) {e.printStackTrace();return null;} finally {try {in.close();fos.close();} catch (Exception e) {e.printStackTrace();}}return "/images/headPhoto/" + newImgName;}

调用直接传个request过来就行了