Go语言视频零基础入门到精通

yy1020

使用http传图片时,真机(包括2.2包刷的平板还有htc的一部2.2的手机)有时能读到图片有时读不到(读不到的概率大于读的到,但貌似排除图片大过头了的情况下,越大的图片越容易读到)，而且服务器端和客户端都不报错,我打印过服务端从数据库取到的byte[]，总是能取到的,但就是不知道为什么传到客户端时有事就是空的。另外在模拟器上就总是能读到图片,试了N次没出现过读到空的,请问这是什么原因造成的。

//服务端代码

public void map() {

ServletOutputStream out = null;

int mapId = 0;

byte[] is = null;

try {

String content = IOUtils.toString(getRequest().getInputStream());

JSONObject json = new JSONObject(content);

mapId = json.getInt("mapId");

} catch (Exception e) {

log.error("读取参数错误", e);

return;

}



try {

SystemInterface msi = SystemInterface.getInstance();

// 从数据库读取图品的io流并转为byte[]

is = msi.mapMap(mapId);

} catch (Exception e) {

log.error("读取失败", e);

return;

}



if(is != null){

try {

out = getResponse().getOutputStream();

out.write(is);

out.flush();

out.close();

} catch (IOException e) {

e.printStackTrace();

}



}



}
[/code]//获取图片

public static Bitmap getImageResult(String actionUrl, String request,int mapSize) {

Bitmap bm = null;

try {

URL url = new URL("http://" + host + ":" + port + actionUrl);

Log.d(TAG, String.format("Request (url: %s; Extra: %s)", url.toString(), request));



HttpURLConnection connect = (HttpURLConnection) url.openConnection();

connect.setDoOutput(true);

connect.setDoInput(true);

connect.setRequestMethod(&quotOST");

connect.setRequestProperty("Content-Type", "text/HTML");

connect.setRequestProperty("Accept", "*/*");

connect.setRequestProperty("Connection", "keep-alive");

connect.setConnectTimeout(15 * 1000);

connect.setRequestProperty("Accept-Language", "en-us");

connect.setRequestProperty("Accept-Encoding", "gzip, deflate");



OutputStreamWriter wr = new OutputStreamWriter(connect.getOutputStream());

wr.write(request);

wr.flush();

InputStream is = connect.getInputStream();

//图片

if(is != null){

BitmapFactory.Options options = new BitmapFactory.Options();

options.inJustDecodeBounds = false;

options.inSampleSize = mapSize;

bm = BitmapFactory.decodeStream(is, null, options);

}

is.close();

} catch (Exception e) {

e.printStackTrace();

}

return bm;

}
[/code]