Android HttpUrlconnection使用总结

/* 上传文件至Server的方法 */  
    private void uploadFile() {  
        String end = "\r\n";  
        String twoHyphens = "--";  
        String boundary = "*****";  
        String newName = "image.jpg";  
        String uploadFile = "storage/sdcard1/bagPictures/102.jpg";  
        ;  
        String actionUrl = "http://192.168.1.123:8080/upload/servlet/UploadServlet";  
        try {  
            URL url = new URL(actionUrl);  
            HttpURLConnection con = (HttpURLConnection) url.openConnection();  
            /* 允许Input、Output，不使用Cache */  
            con.setDoInput(true);  
            con.setDoOutput(true);  
            con.setUseCaches(false);  
            /* 设置传送的method=POST */  
            con.setRequestMethod("POST");  
            /* setRequestProperty */  
            con.setRequestProperty("Connection", "Keep-Alive");  
            con.setRequestProperty("Charset", "UTF-8");  
            con.setRequestProperty("Content-Type",  
                    "multipart/form-data;boundary=" + boundary);  
            /* 设置DataOutputStream */  
            DataOutputStream ds = new DataOutputStream(con.getOutputStream());  
            ds.writeBytes(twoHyphens + boundary + end);  
            ds.writeBytes("Content-Disposition: form-data; "  
                    + "name=\"file1\";filename=\"" + newName + "\"" + end);  
            ds.writeBytes(end);  
            /* 取得文件的FileInputStream */  
            FileInputStream fStream = new FileInputStream(uploadFile);  
            /* 设置每次写入1024bytes */  
            int bufferSize = 1024;  
            byte[] buffer = new byte[bufferSize];  
            int length = -1;  
            /* 从文件读取数据至缓冲区 */  
            while ((length = fStream.read(buffer)) != -1) {  
                /* 将资料写入DataOutputStream中 */  
                ds.write(buffer, 0, length);  
            }  
            ds.writeBytes(end);  
            ds.writeBytes(twoHyphens + boundary + twoHyphens + end);  
            /* close streams */  
            fStream.close();  
            ds.flush();  
            /* 取得Response内容 */  
            InputStream is = con.getInputStream();  
            int ch;  
            StringBuffer b = new StringBuffer();  
            while ((ch = is.read()) != -1) {  
                b.append((char) ch);  
            }  
            /* 将Response显示于Dialog */  
            showDialog("上传成功" + b.toString().trim());  
            /* 关闭DataOutputStream */  
            ds.close();  
        } catch (Exception e) {  
            showDialog("上传失败" + e);  
        }  
    }  

public class UploadServlet extends HttpServlet {  
  
    public void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
        try {  
            System.out.println("IP:" + request.getRemoteAddr());  
            // 1、创建工厂类：DiskFileItemFactory  
            DiskFileItemFactory facotry = new DiskFileItemFactory();  
            String tempDir = getServletContext().getRealPath("/WEB-INF/temp");  
            facotry.setRepository(new File(tempDir));//设置临时文件存放目录  
            // 2、创建核心解析类：ServletFileUpload  
            ServletFileUpload upload = new ServletFileUpload(facotry);  
            upload.setHeaderEncoding("UTF-8");// 解决上传的文件名乱码  
            upload.setFileSizeMax(1024 * 1024 * 1024);// 单个文件上传最大值是1M  
            upload.setSizeMax(2048 * 1024 * 1024);//文件上传的总大小限制  
  
            // 3、判断用户的表单提交方式是不是multipart/form-data  
            boolean bb = upload.isMultipartContent(request);  
            if (!bb) {  
                return;  
            }  
            // 4、是：解析request对象的正文内容List<FileItem>  
            List<FileItem> items = upload.parseRequest(request);  
            String storePath = getServletContext().getRealPath(  
                    "/WEB-INF/upload");// 上传的文件的存放目录  
            for (FileItem item : items) {  
                if (item.isFormField()) {  
                    // 5、判断是否是普通表单：打印看看  
                    String fieldName = item.getFieldName();// 请求参数名  
                    String fieldValue = item.getString("UTF-8");// 请求参数值  
                    System.out.println(fieldName + "=" + fieldValue);  
                } else {  
                    // 6、上传表单：得到输入流，处理上传：保存到服务器的某个目录中，保存时的文件名是啥？  
                    String fileName = item.getName();// 得到上传文件的名称 C:\Documents  
                                                        // and  
                                                        // Settings\shc\桌面\a.txt  
                                                        // a.txt  
                    //解决用户没有选择文件上传的情况  
                    if(fileName==null||fileName.trim().equals("")){  
                        continue;  
                    }  
                    fileName = fileName  
                            .substring(fileName.lastIndexOf("\\") + 1);  
                    String newFileName = UUIDUtil.getUUID() + "_" + fileName;  
                    System.out.println("上传的文件名是：" + fileName);  
                    InputStream in = item.getInputStream();  
                    String savePath = makeDir(storePath, fileName) + "\\"  
                            + newFileName;  
                    OutputStream out = new FileOutputStream(savePath);  
                    byte b[] = new byte[1024];  
                    int len = -1;  
                    while ((len = in.read(b)) != -1) {  
                        out.write(b, 0, len);  
                    }  
                    in.close();  
                    out.close();  
                    item.delete();//删除临时文件  
                }  
            }  
        }catch(FileUploadBase.FileSizeLimitExceededException e){  
            request.setAttribute("message", "单个文件大小不能超出5M");  
            request.getRequestDispatcher("/message.jsp").forward(request,  
                    response);  
        }catch(FileUploadBase.SizeLimitExceededException e){  
            request.setAttribute("message", "总文件大小不能超出7M");  
            request.getRequestDispatcher("/message.jsp").forward(request,  
                    response);  
    }catch (Exception e) {  
            e.printStackTrace();  
            request.setAttribute("message", "上传失败");  
            request.getRequestDispatcher("/message.jsp").forward(request,  
                    response);  
        }  
    }  
  
    // WEB-INF/upload/1/3 打散存储目录  
    private String makeDir(String storePath, String fileName) {  
        int hashCode = fileName.hashCode();// 得到文件名的hashcode码  
        int dir1 = hashCode & 0xf;// 取hashCode的低4位 0~15  
        int dir2 = (hashCode & 0xf0) >> 4;// 取hashCode的高4位 0~15  
        String path = storePath + "\\" + dir1 + "\\" + dir2;  
        File file = new File(path);  
        if (!file.exists())  
            file.mkdirs();  
        System.out.println("存储路径是"+path);  
        return path;  
    }  
  
    public void doPost(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
        doGet(request, response);  
    }  
  
}