简单的图片上传和下载
一.图片的上传
1.图片的来源无非是照相和图库的选择 将选择的图片进行封装到bean类中进行返回，之后通过上传的方式去上传
2.上传的方式也是两种方式，通过的字符串或者流的方式（先建立链接在通过流）
3.服务器返回的数据是上传成功与否的标识
4.使用框架进行上传。如：okhttp，xUtils，volley等等；
二.图片的下载
1.三级缓存（）
2.第三方框架
更多的了解：http://blog.sina.com.cn/s/blog_9ac333de0101gptn.html
http://blog.csdn.net/u011240877/article/details/45824855
补充：
图片上传的方法：
直接从项目中copy的，可以参考这块的思路
在gridView上进行展示上传的个数
public class GridAdapter extends BaseAdapter {
private LayoutInflater inflater; // 视图容器
private int selectedPosition = -1;// 选中的位置
private boolean shape;
public boolean isShape() {
return shape;
}
public void setShape(boolean shape) {
this.shape = shape;
}
public GridAdapter(Context context) {
inflater = LayoutInflater.from(context);
}
// 从新加载并且上传新的多余的图片
public void update1() {
loading1();
}
public int getCount() {
return (Bimp.bmp.size() + 1);
}
public Object getItem(int arg0) {
return null;
}
public long getItemId(int arg0) {
return arg0;
}
public void setSelectedPosition(int position) {
selectedPosition = position;
}
public int getSelectedPosition() {
return selectedPosition;
}
/**
* ListView Item设置
*/
public View getView(int position, View convertView, ViewGroup parent) {
// final int coord = position;
ViewHolder holder = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.item_published_grida,
parent, false);
holder = new ViewHolder();
holder.image = (ImageView) convertView
.findViewById(R.id.item_grida_image);
holder.customView = (CustomView6) convertView
.findViewById(R.id.customView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// customViewList.get(0).setVisibility(View.GONE);
holder.image.setVisibility(View.VISIBLE);
holder.customView.setProgress(0);
holder.customView.setVisibility(CustomView6.VISIBLE);
if (position == Bimp.bmp.size()) {
holder.image.setImageBitmap(BitmapFactory.decodeResource(
getResources(), R.drawable.icon_addpic_unfocused));
holder.customView.setVisibility(CustomView6.GONE);
} else {
holder.image.setImageBitmap(Bimp.bmp.get(position));
}
// 是否存在key(适用于拍照)
// 只要有选择照片的就会进来（包括第一次是选择照片）
if(Bimp.drr != null && Bimp.drr.size() > position){
if (Bimp.listtag != null && Bimp.listtag.size() > position) {
// 有上传成功的照片时会走
if (pictureTypeMap.containsKey(Bimp.drr.get(position).uuid)) {
if ("T".equals(pictureTypeMap.get(Bimp.drr.get(position).uuid))){
//角标越界
if (Bimp.listtag.size() > position) {
if (Bimp.listtag.get(position).equals(Bimp.drr.get(position).uuid)) {
holder.customView.setProgress(100);
}
}
}
}
}
}
if (position >= 9) {
holder.image.setVisibility(View.GONE);
cameraBtn.setVisibility(View.GONE);
if (Selected == 9) {
Toast.makeText(FieldInspecRegisterActivity.this,
"单次最大上传图片为9张", 0).show();
}
}
return convertView;
}
}
public class ViewHolder {
public ImageView image;
public CustomView6 customView;
}
//根据返回的集合的内容来展示图片
private void loading1() {
new Thread(new Runnable() {
public void run() {
while (true) {
if (Bimp.max == Bimp.drr.size()) {
Message message = new Message();
message.what = CHANGDATA;
handler.sendMessage(message);
break;
} else {
try {
String path = Bimp.drr.get(Bimp.max).path;
Bitmap bm = Bimp.revitionImageSize(path);
Bimp.bmp.add(bm);
String newStr = path.substring(
path.lastIndexOf("/") + 1,
path.lastIndexOf("."));
FileUtils.saveBitmap(bm, "" + newStr);
Bimp.max += 1;
Message message = new Message();
message.what = CHANGDATA;
handler.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}).start();
}
//监听物理返回键
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
if (Bimp.drr.size() > 0 && Selected < Bimp.drr.size()) {
//整在上传时进行对话框判断是否终止
showMyDialog();
} else {
if (attendance.getType().equals("back")) {
finish();
} else {
if (!(Bimp.drr.size() > Selected)) {
//上传的完成时
uploadPicStr();
}
}
}
}
return super.onKeyDown(keyCode, event);
}
//当界面返回时调用改方法，adapter适配
protected void onRestart() {
adapter2.update1();
super.onRestart();
}
// 界面销毁时，有数据需要清除
protected void onDestory() {
//广播注销
unregisterBroadcastReceiver();
if (Bimp.drr.size() > 0) {
Bimp.drr.clear();
}
if (Bimp.listtag.size() > 0) {
Bimp.listtag.clear();
}
if (Bimp.bmp.size() > 0) {
Bimp.bmp.clear();
}
FileUtils.deleteDir();
Bimp.max = 0;
Bimp.act_bool = false;
}
//
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// 拍照
if (resultCode == RESULT_OK && (requestCode == PHOTO_GRAPH )) {
PhotoSelect++;
//拿到路径再次请求上传
if (picture.getAbsolutePath().length() > 0) {
//每次拿到给定图片的对象
UUID randomUUID = UUID.randomUUID();
BeanPicUpload mbeanPicUpload = new BeanPicUpload();
mbeanPicUpload.path=picture.getAbsolutePath();
mbeanPicUpload.uuid = randomUUID+"";
mbeanPicUpload.isSussecs=true;
Bimp.drr.add(mbeanPicUpload);
}
}
}
/**
* 上传图片
* 在生命止周期的方法去做
* 每次返回到当前的界面时就会执行上传的方法
* 这个方法在子线程中去完成，只要这个所有图片的 只有未成功上传的图片，该方法就在一直执行，直到到上传完成；
* */
@Override
protected void onResume() {
super.onResume();
if (isNetworkAvailable(FieldInspecRegisterActivity.this)) {
if(Bimp.drr.size()>0){
//每次进界面时都会重新调用
uploadThreadTest(Bimp.drr);
L.e(TAG, "wode 每次必须执行的方法 且这里面现在没有要执行的方法: "+Bimp.drr.toString());
}
} else {
Toast.makeText(FieldInspecRegisterActivity.this, "请检查网络",
Toast.LENGTH_SHORT).show();
}
}
/**
* 上传图片的方法
* @param mBeandrr
*/
private void uploadThreadTest(final List<BeanPicUpload> mListBeandrr) {
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < mListBeandrr.size(); i++) {
if(!Bimp.listtag.contains(mListBeandrr.get(i).uuid)){
upload(mListBeandrr.get(i));
L.e(TAG, "Bimp.listtag集合中的元素 "+Bimp.listtag.toString());
L.e(TAG, "要上传的数据"+mListBeandrr.get(i));
}
}
}
}).start();
}
private boolean isnextone =false ;
/**
* 在子线程中操作集合
*/
private void upload(BeanPicUpload beanPicUpload) {
//传递过来drr
String url_ = "http://cserverupload.cserver.cn/fileupload.do";
int res = -1;
String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成
String PREFIX = "--";
String LINE_END = "\r\n";
String CONTENT_TYPE = "multipart/form-data"; // 内容类型
if (isNetworkAvailable(FieldInspecRegisterActivity.this)) {
if(Bimp.drr.size()>0){
//图片上传 已上传的就不要在上传(且开始时上传的集合是空)
//ture表示要上传的
L.e(TAG,"shenme 时候去执行了 :"+Bimp.listtag.size());
uploadPic(url_, BOUNDARY, PREFIX, LINE_END, CONTENT_TYPE,beanPicUpload);
}
} else {
Toast.makeText(FieldInspecRegisterActivity.this, "请检查网络", 0).show();
}
}
private void uploadPic(String url_, String BOUNDARY, String PREFIX,
String LINE_END, String CONTENT_TYPE,BeanPicUpload picbean) {
if(!isnextone){
isnextone=true;
Log.e(TAG, "传进来的数据 开始上传的数据 "+picbean.toString());
if((!picbean.path.equals(""))&&picbean.path!=null){
File perfile = new File(picbean.path);
int res = -1;
// 图片上传
if (perfile != null) {
HttpURLConnection conn;
URL url;
try {
url = new URL(url_);
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);
DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
L.e(TAG, "wode 数据输出流建立");
/**
* 当文件不为空时执行上传
* 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
*
*/
StringBuffer sb = new StringBuffer();
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINE_END);
L.e(TAG, "wode shangchuan de wenjian 名称："+perfile.getName());
sb.append("Content-Disposition: form-data; name=\"file\"; filename=\""+ perfile.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(perfile);
long total = perfile.length();
byte[] bytes = new byte[1024 * 10];
int len = 0;
int count = 0;
int progress = 0;
while ((len = is.read(bytes)) != -1) {
count += len;
progress = ((int) ((count / (float) total) * 100));
if (progress == 100) {
}
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
*/
res = conn.getResponseCode();
if (res == 200) {
InputStream input = conn.getInputStream();
StringBuffer sb1 = new StringBuffer();
int ss;
while ((ss = input.read()) != -1) {
sb1.append((char) ss);
}
String result = sb1.toString();
JSONObject jsonObject;
jsonObject = new JSONObject(result);
uploadStr.append(jsonObject.optString("downloadUrl"));
uploadStr.append(",");
uploadNewStr.append(jsonObject.optString("newdownloadUrl"));
uploadNewStr.append(",");
//上传成功时进行保存
Selected++;// 成功的第几张图片
if (!pictureTypeMap.containsKey(picbean.uuid)) {
// 为什么在这打不到phototselect的值
pictureTypeMap.put(picbean.uuid, "T");// 选择的
L.e(TAG, "集合中保存了数据 ："+picbean.uuid+""+" "+"T");
}
// 使用bean类来记录所有的图片
Bimp.listtag.add(picbean.uuid);
// 这个发送消息的时候是关键
handler.sendEmptyMessage(UPLOADSUCCESS);
isnextone = false;
Log.e(TAG, "上传成功就会发送消息 Bimp.listtag 集合"+Bimp.listtag.toString());
Log.e(TAG, "上传成功就会发送消息 Bimp.drr 集合 "+Bimp.drr.toString());
} else if (res == 404) {
Toast.makeText(FieldInspecRegisterActivity.this, "网页找不到", 0)
.show();
} else if (res == 500) {
Toast.makeText(FieldInspecRegisterActivity.this, "服务器有问题",
0).show();
}
} catch (Exception e) {
Log.e(TAG, "异常 " + e.toString());
e.printStackTrace();
}
}
}
}
}
