@liter
2015-10-05T00:01:01.000000Z
字数 5072
阅读 7035
litehttp2.x版本系列教程
官网: http://litesuits.com
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本系列文章面向android开发者,展示开源网络通信框架LiteHttp的主要用法,并讲解其关键功能的运作原理,同时传达了一些框架作者在日常开发中的一些最佳实践和经验。
本系列文章目录总览: https://zybuluo.com/liter/note/186513
先准备一张网络图片,比如:
public static final String picUrl = "http://pic.33.la/20140403sj/1638.jpg";
然后下载之
第一步:
liteHttp.executeAsync(new FileRequest(picUrl, "sdcard/aaa.jpg"));第二步:
不好意思,已经下载好了。
下载位图并监听进度
liteHttp.executeAsync(
new BitmapRequest(picUrl).setHttpListener(
new HttpListener<Bitmap>(true, true, false) {
@Override
public void onLoading(AbstractRequest<Bitmap> request, long total, long len) {
HttpLog.i(TAG, total + " total " + len + " len");
}
@Override
public void onSuccess(Bitmap bitmap, Response<Bitmap> response) {
downProgress.dismiss();
AlertDialog.Builder b = HttpUtil.dialogBuilder(activity, "LiteHttp2.0", "");
ImageView iv = new ImageView(activity);
iv.setImageBitmap(bitmap);
b.setView(iv);
b.show();
}
@Override
public void onFailure(HttpException e, Response<Bitmap> response) {
HttpUtil.showTips(activity, "LiteHttp2.0", e.toString());
}
}));
迅雷不及掩耳之势,别停,继续...
为方便测试,我在SD卡上放置一张名为aaa.jpg的图片,然后开撸:
// 替换自己的服务器地址
public static final String uploadUrl = "http://192.168.0.0:8080/upload";
HttpListener uploadListener = new HttpListener<String>(true, false, true) {
@Override
public void onSuccess(String s, Response<String> response) {
response.printInfo();
}
@Override
public void onFailure(HttpException e, Response<String> response) {
response.printInfo();
}
@Override
public void onUploading(AbstractRequest<String> request, long total, long len) {
}
};
final StringRequest upload = new StringRequest(uploadUrl)
.setMethod(HttpMethods.Post)
.setHttpListener(uploadListener)
.setHttpBody(new FileBody(new File("/sdcard/aaa.jpg")));
liteHttp.executeAsync(upload);
通过流上传:
// uploadListener上面已经定义,不在重复写
FileInputStream fis = null;
try {
fis = new FileInputStream(new File("/sdcard/aaa.jpg"));
} catch (Exception e) {
e.printStackTrace();
}
final StringRequest upload = new StringRequest(uploadUrl)
.setMethod(HttpMethods.Post)
.setHttpListener(uploadListener)
.setHttpBody(new InputStreamBody(fis));
liteHttp.executeAsync(upload);
服务器端 可以这样接收 单个文件 的上传:
private void processEntity(String dir, HttpServletRequest request) {
try {
File uploadFile = new File(dir + "a-upload");
InputStream input = request.getInputStream();
OutputStream output = new FileOutputStream(uploadFile);
byte[] buffer = new byte[4096];
int n = -1;
while ((n = input.read(buffer)) != -1) {
if (n > 0) {
output.write(buffer, 0, n);
}
}
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
如果是 Servlet ,那么在 doPost 中合适时机调用此方法即可,文件夹位置根据实际情况设置,比如测试时windows系统设置dir = "D:\Downloads", Mac系统设置dir = "/Users/.../Downloads"。由于MD文件的格式化可能导致斜杠不显示,注意斜杠方向和数量要正确。
另外,服务器需要apache提供的jar包支持接收文件,比如:commons-fileupload-1.3.1.jar 等。
上面就是单文件上传的两种方式,mimetype为application/octet-stream,还有一种文件、表单混合,并且可以传多文件的上传方式,mimetype为multipart/form-data,即:表单上传。
多文件上传,我又在SD卡下面又放了一个文本文件 litehttp.txt:
// litehttp.txt使用流上传;aaa.jpg使用文件式上传。
fis = null;
try {
fis = new FileInputStream(new File("/sdcard/litehttp.txt"));
} catch (Exception e) {
e.printStackTrace();
}
MultipartBody body = new MultipartBody();
body.addPart(new StringPart("key1", "hello"))
.addPart(new StringPart("key2", "很高兴见到你", "utf-8", null))
.addPart(new BytesPart("key3", new byte[]{1, 2, 3}))
.addPart(new FilePart("pic", new File("/sdcard/aaa.jpg"), "image/jpeg"))
.addPart(new InputStreamPart("litehttp", fis, "litehttp.txt", "text/plain"));
// uploadListener上面已经定义,不在重复写
final StringRequest upload = new StringRequest(uploadUrl)
.setMethod(HttpMethods.Post)
.setHttpListener(uploadListener)
.setHttpBody(body);
liteHttp.executeAsync(upload);
服务器端 可以这样接收 多个文件 的上传:
// String fileDir = "D:\\Downloads";
// 这是我的Mac笔记本上的位置,开发者设置为合适自己的文件夹,尤其windows系统。
String fileDir = "/Users/.../Downloads";
String contentType = request.getContentType();
if (contentType.startsWith("multipart")) {
//向客户端发送响应正文
try {
//创建一个基于硬盘的FileItem工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
//设置向硬盘写数据时所用的缓冲区的大小,此处为4K
factory.setSizeThreshold(4 * 1024);
//设置临时目录
factory.setRepository(new File(fileDir));
//创建一个文件上传处理器
ServletFileUpload upload = new ServletFileUpload(factory);
//设置允许上传的文件的最大尺寸,此处为100M
upload.setSizeMax(100 * 1024 * 1024);
Map<String, List<FileItem>> itemMap = upload.parseParameterMap(request);
for (List<FileItem> items : itemMap.values()) {
Iterator iter = items.iterator();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (item.isFormField()) {
processFormField(item, writer); //处理普通的表单域
} else {
processUploadedFile(fileDir, item, writer); //处理上传文件
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* 处理表单字符数据
*/
private void processFormField(FileItem item, PrintWriter writer) {
String name = item.getFieldName();
String value = item.getString();
writer.println("Form Part [" + name + "] value :" + value + "\r\n");
}
/**
* 处理表单文件
*/
private void processUploadedFile(String filePath, FileItem item, PrintWriter writer) throws Exception {
String filename = item.getName();
int index = filename.lastIndexOf("\\");
filename = filename.substring(index + 1, filename.length());
long fileSize = item.getSize();
if (filename.equals("") && fileSize == 0)
return;
File uploadFile = new File(filePath + "/" + filename);
item.write(uploadFile);
writer.println(
"File Part [" + filename + "] is saved." + " contentType: " + item
.getContentType() + " , size: " + fileSize + "\r\n");
}
好了,到此为止下载和上传都搞定了,喝杯水休息下...