Android HttpURLConnection上传图片至Servlet端指定目录

客户端（核心代码）：

/** * 文件上传 * * @param urlStr 接口路径 * @param filePath 本地图片路径 * @return */public static String formUpload(String urlStr, String filePath) {    String rsp = "";    HttpURLConnection conn = null;    String BOUNDARY = "|"; // request头和上传文件内容分隔符    try {        URL url = new URL(urlStr);        conn = (HttpURLConnection) url.openConnection();        conn.setConnectTimeout(5000);        conn.setReadTimeout(30000);        conn.setDoOutput(true);        conn.setDoInput(true);        conn.setUseCaches(false);        conn.setRequestMethod("POST");        conn.setRequestProperty("Connection", "Keep-Alive");        conn.setRequestProperty("User-Agent",                "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");        conn.setRequestProperty("Content-Type",                "multipart/form-data; boundary=" + BOUNDARY);        OutputStream out = new DataOutputStream(conn.getOutputStream());        File file = new File(filePath);        String filename = file.getName();        String contentType = "";        if (filename.endsWith(".png")) {            contentType = "image/png";        }        if (filename.endsWith(".jpg")) {            contentType = "image/jpg";        }        if (filename.endsWith(".gif")) {            contentType = "image/gif";        }        if (filename.endsWith(".bmp")) {            contentType = "image/bmp";        }        if (contentType == null || contentType.equals("")) {            contentType = "application/octet-stream";        }        StringBuffer strBuf = new StringBuffer();        strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");        strBuf.append("Content-Disposition: form-data; name=\"" + filePath                + "\"; filename=\"" + filename + "\"\r\n");        strBuf.append("Content-Type:" + contentType + "\r\n\r\n");        out.write(strBuf.toString().getBytes());        DataInputStream in = new DataInputStream(new FileInputStream(file));        int bytes = 0;        byte[] bufferOut = new byte[1024];        while ((bytes = in.read(bufferOut)) != -1) {            out.write(bufferOut, 0, bytes);        }        in.close();        byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();        out.write(endData);        out.flush();        out.close();        // 读取返回数据        StringBuffer buffer = new StringBuffer();        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));        String line = null;        while ((line = reader.readLine()) != null) {            buffer.append(line).append("\n");        }        rsp = buffer.toString();        reader.close();        reader = null;    } catch (Exception e) {        e.printStackTrace();    } finally {        if (conn != null) {            conn.disconnect();            conn = null;        }    }    return rsp;}

服务端（核心代码）：

public class upload extends HttpServlet {

public upload() {
super();
}

public void destroy() {
super.destroy();
}

/**
* The doGet method of the servlet.

* This method is called when a form has its tag value method equals to get.
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println(
"");
out.println("");
out.println(" A Servlet");
out.println(" ");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" ");
out.println("");
out.flush();
out.close();
}

/**
* The doPost method of the servlet.

* This method is called when a form has its tag value method equals to
* post.
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
@SuppressWarnings("deprecation")
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8"); // 设置编码
// 获得磁盘文件条目工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设定文件需要上传到的路径
File file = new File("E://WebSite");
if (!file.exists()) {
file.mkdirs();
}
factory.setRepository(file);
// 设置缓存的大小
factory.setSizeThreshold(1024 * 1024);
// 文件上传处理
ServletFileUpload upload = new ServletFileUpload(factory);
try {
// 可以上传多个文件
List list = (List) upload.parseRequest(request);
for (FileItem item : list) {
// 获取属性名字
String name = item.getFieldName();
// 如果获取的表单信息是普通的文本信息
if (item.isFormField()) {
// 获取用户具体输入的字符串,因为表单提交过来的是字符串类型的
String value = item.getString();
request.setAttribute(name, value);
} else {
// 获取路径名
String value = item.getName();
// 索引到最后一个反斜杠
int start = value.lastIndexOf("\\");
// 截取上传文件的字符串名字，加1是去掉反斜杠，
String filename = value.substring(start + 1);
request.setAttribute(name, filename);
// 写到磁盘上
item.write(new File("E://WebSite", filename));// 第三方提供的
System.out.println("上传成功：" + filename);
response.getWriter().print(filename);// 将路径返回给客户端
}
}
} catch (Exception e) {
System.out.println("上传失败");
e.printStackTrace();
}
}

/**
* Initialization of the servlet.

* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}

注对于commons-fileupload-1.4.jar和commons-io-1.4.jar而言，不仅仅需要在servlet工程中住进来，还要在本地的Tomcat/lib目录下面进行追加。

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