Android、IOS 图片上传接口（Java实现Servlet）。

1、java Servlet 实现图片上传代码。（返回结果格式为json格式）

package com.ninepoint.babystar.server.action;import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONObject;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.log4j.Logger;import com.ninepoint.babystar.server.bean.ResultBaseBean;/** *  * @Description 图片上传接口（Servlet实现）支持参数和多张图片的上传 * @author nier_ni * @date 2015-9-26 上午11:05:52  * @version */public class UploadFileServlet extends HttpServlet {  /** @Fields serialVersionUID: */  private static final long serialVersionUID = -4903483985922185852L;private final Logger logger = Logger.getLogger(UploadFileServlet.class); public void doGet(HttpServletRequest request, HttpServletResponse response)              throws ServletException, IOException {  String realPath = this.getServletContext().getRealPath("images");  //图片保存路径ResultBaseBean result = new ResultBaseBean();result.setResult(0);        boolean isMultipart = ServletFileUpload.isMultipartContent(request);          if(isMultipart){          /**         * 1、上传是否有数据；         * 2、图片存放路径；         * 3、图片是否保存成功。 result 1、上传成功，0、上传失败。         */            String msg = null;            HashMap<String,String> params = uploadImg(realPath,request);            responseOutWithJson(response,result);        }      }      public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {      this.doGet(request,response);    }    /**     *      * @Description 上传图片     * @param realPath     * @param request     */    public HashMap<String,String> uploadImg(String realPath, HttpServletRequest request){    HashMap<String,String> hashMap = new HashMap<String, String>();    int i = 0;    String fileName = null;    File dir = new File(realPath);        DiskFileItemFactory factory = new DiskFileItemFactory();          ServletFileUpload upload = new ServletFileUpload(factory);          upload.setSizeMax(1024*1024*5*9);        upload.setHeaderEncoding("utf-8");          try {              List<FileItem> items = upload.parseRequest(request);              for(FileItem item : items){                  if(item.isFormField()){ //username="username"                      String name = item.getFieldName();                      String value = item.getString("utf-8");                      //System.out.println(name + " = " + value);                      hashMap.put(name, value);                } else { //文件                      String name = item.getName();                    fileName = System.currentTimeMillis() + name.substring(name.lastIndexOf("."));                   // item.write(new File(dir, System.currentTimeMillis() + name.substring(name.lastIndexOf("."))));                    item.write(new File(dir, fileName));                      hashMap.put("imgs"+i,realPath.substring(realPath.lastIndexOf("\\")).substring(1) +"/"+ fileName);                }             }              hashMap.put("num",i+"");        } catch (Exception e) {              e.printStackTrace();              logger.error("图片上传失败。",e);        }         return hashMap;    }    /**      * 以JSON格式输出      * @param response      */      protected void responseOutWithJson(HttpServletResponse response,              Object responseObject) {          //将实体对象转换为JSON Object转换          JSONObject responseJSONObject = JSONObject.fromObject(responseObject);          response.setCharacterEncoding("UTF-8");          response.setContentType("application/json; charset=utf-8");          PrintWriter out = null;          try {              out = response.getWriter();              out.append(responseJSONObject.toString());              logger.debug("返回是\n");              logger.debug(responseJSONObject.toString());          } catch (IOException e) {              e.printStackTrace();          } finally {              if (out != null) {                  out.close();              }          }      }}

结果基类

package com.ninepoint.babystar.server.bean;import java.io.Serializable;import net.sf.json.JSONObject;/** * 请求返回结果基类。 * 返回结果的公共数据可以放在此类 * @author nier_ni * */public class ResultBaseBean implements Serializable{private static final long serialVersionUID = 7755697531438413626L;/** * 请求结果 1代表成功  0代表失败 * 默认为成功 */protected int result = 1;/** * 错误编码  * 只有当 result为0时才有 errorCode 和 errorMsg */protected String errorCode = "";/**错误信息*/protected String errorMsg = "";protected Object data = null;public Object getData() {return data;}public void setData(Object data) {this.data = data;}public int getResult() {return result;}public void setResult(int result) {this.result = result;}public String getErrorCode() {return errorCode;}public void setErrorCode(String errorCode) {this.errorCode = errorCode;}public String getErrorMsg() {return errorMsg;}public void setErrorMsg(String errorMsg) {this.errorMsg = errorMsg;}public JSONObject toJsonObject(){JSONObject jo = new JSONObject();jo.put("result", result);jo.put("errorCode", errorCode);jo.put("errorMsg", errorMsg);jo.put("data", data.toString());return jo;}@Overridepublic String toString() {return this.toJsonObject().toString();}}

web.xml配置

<servlet>  <span style="white-space:pre"></span><servlet-name>uploadFileServlet</servlet-name>  <span style="white-space:pre"></span><servlet-class>com.ninepoint.babystar.server.action.UploadFileServlet</servlet-class>  </servlet>  <servlet-mapping>  <servlet-name>uploadFileServlet</servlet-name>  <url-pattern>/uploadFileServlet</url-pattern>  </servlet-mapping>  

2、测试上传图片（模拟发送上传图片请求）。

package com.ninepoint.babystar.test.action;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;/** *  * @Description 图片上传模拟HTTP请求 * @author nier_ni * @date 2015-9-26 上午11:17:24  * @version */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://192.168.1.161:8080/uploadFileServlet";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=\"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) {return SUCCESS;}}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return FAILURE;}}