Java 我想下载web内容,但它不是';t工作不正常
我想下载一个网站并在日志中以字符串的形式显示内容,但首先应用程序需要几个小时才能加载,如果加载,我就得不到网站的源代码Java 我想下载web内容,但它不是';t工作不正常,java,android,download,Java,Android,Download,我想下载一个网站并在日志中以字符串的形式显示内容,但首先应用程序需要几个小时才能加载,如果加载,我就得不到网站的源代码 public class MainActivity extends AppCompatActivity { public class DownloadTask extends AsyncTask<String, Void, String> { @Override protected String doInBackgro
public class MainActivity extends AppCompatActivity {
public class DownloadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection)url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data!= -1) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
}
catch (Exception e){
e.printStackTrace();
return "Failed";
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DownloadTask task = new DownloadTask();
String result = null;
try {
result = task.execute("http://www.kicker.de/").get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
Log.i("Contents of URL", result);
}
}
public类MainActivity扩展了AppCompatActivity{
公共类DownloadTask扩展了AsyncTask{
@凌驾
受保护的字符串doInBackground(字符串…URL){
字符串结果=”;
网址;
HttpURLConnection-urlConnection=null;
试一试{
url=新url(url[0]);
urlConnection=(HttpURLConnection)url.openConnection();
InputStream in=urlConnection.getInputStream();
InputStreamReader reader=新的InputStreamReader(in);
int data=reader.read();
while(数据!=-1){
当前字符=(字符)数据;
结果+=电流;
data=reader.read();
}
返回结果;
}
捕获(例外e){
e、 printStackTrace();
返回“失败”;
}
}
}
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DownloadTask任务=新建DownloadTask();
字符串结果=null;
试一试{
结果=任务。执行(“http://www.kicker.de/).get();
}捕捉(中断异常e){
e、 printStackTrace();
}捕获(执行例外){
e、 printStackTrace();
}
Log.i(“URL内容”,结果);
}
}
您应该使用BufferedReader从InputStreamReader读取实际数据
public class DownloadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
StringBuilder html = new StringBuilder();
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection)url.openConnection();
InputStream in = urlConnection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
for (String line; (line = reader.readLine()) != null; ) {
html.append(line);
}
return html.toString();
}
catch (Exception e){
e.printStackTrace();
return "Failed";
}
finally{
in.close();
}
}
公共类下载任务扩展了异步任务{
@凌驾
受保护的字符串doInBackground(字符串…URL){
StringBuilder html=新的StringBuilder();
网址;
HttpURLConnection-urlConnection=null;
试一试{
url=新url(url[0]);
urlConnection=(HttpURLConnection)url.openConnection();
InputStream in=urlConnection.getInputStream();
BufferedReader reader=新的BufferedReader(新的InputStreamReader(in));
for(字符串行;(line=reader.readLine())!=null;){
html.append(行);
}
返回html.toString();
}
捕获(例外e){
e、 printStackTrace();
返回“失败”;
}
最后{
in.close();
}
}
}切勿使用
execute().get()
。它违背了异步任务的目的,您没有看到文档吗?