Android通过HttpURLConnection类进行网络通信，获取网络图片
2014-09-09 15:47
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Http通信中使用的最多的是Get和Post。Get请求可以获取静态页面，也可以把参数放在url字符串后面传递给服务器。Post与Get的不同之处在于Post的参数不是放在url字符串里面，而是放在http请求数据中。HttpURLConnection是Java的标准类，继承自URLConnection类，URLConnection与 HttpURLConnection都是抽象类，去、、无法直接实例化对象。其对象主要通过URL的openConnection方法获得。下面就两种方式分别提供示例：
其中有两个资源文件，两个jsp的内容分别如下：
http.jsp
[html] view
plaincopy
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<%
out.println("<h1>HTTP TEST<br/>http test</h1>");
%>
</body>
</html>
httpGet.jsp
[html] view
plaincopy
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<%
String type = request.getParameter("par");
String result = new String(type.getBytes("iso-8859-1"),"gb2312");
out.println("<h1>parameters:"+result+"</h1>");
%>
</body>
</html>
1、 HttpURLConnection 类通过Get方式获取网络资源：
[java] view
plaincopy
public class GetActivity extends Activity {
private String TAG = "GetActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.http);
TextView textView = (TextView)findViewById(R.id.text);
String urlString = "http://127.0.0.1:8080/test/httpGet.jsp?par=test";//http地址
String resultData = "";//获得的数据
URL url = null;
try {
url = new URL(urlString);//构造一个url对象
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException");
e.printStackTrace();
}
if(url!=null){
try {
HttpURLConnection urlConnection;//使用HttpURLConnection打开连接
urlConnection = (HttpURLConnection)url.openConnection();
InputStream stream = urlConnection.getInputStream();//得到读取的内容
InputStreamReader in = new InputStreamReader(stream);
BufferedReader buffere = new BufferedReader(in); //为输出创建BufferedReader
String line = null;
while((line = buffere.readLine()) != null){//使用while循环来取得获取的数据
resultData += line + "\n";//我们要在每一行的后面加上一个反斜杠来换行
}
if(resultData.equals("")){
textView.setText("没取到数据");
}else{
textView.setText(resultData);
}
in.close();//关闭InputStreamReader
urlConnection.disconnect();//关闭http连接
} catch (IOException e) {
Log.e(TAG, "IOException");
e.printStackTrace();
}
}else{
Log.e(TAG, "url null");
}
}
}
2、 HttpURLConnection 类通过Post方式获取网络资源：
[java] view
plaincopy
public class PostActivity extends Activity {
private String TAG="PostActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.http);
TextView textView = (TextView)findViewById(R.id.text);
String httpUrl = "http://127.0.0.1:8080/test/httpGet.jsp";
String resultData = "";
URL url = null;
try {
url = new URL(httpUrl);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
Log.e(TAG, "MalformedURLException");
e.printStackTrace();
}
if(url!=null){
//使用HttpURLConnection打开连接
HttpURLConnection urlConnection;
try {
urlConnection = (HttpURLConnection)url.openConnection();
//因为这个是post请求，需要设置为true
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
//设置以Post方法
urlConnection.setUseCaches(false);
urlConnection.setInstanceFollowRedirects(true);
//配置本次连接的Content-type
urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
//从url.openConnection()至此的配置必须在connect之前完成，要注意的是：
//connection.getOutputStream会隐含的进行connect
urlConnection.connect();
//DataOutputStream流
DataOutputStream outputStream = new DataOutputStream(urlConnection.getOutputStream());
//要上传的参数
String content = "par=" + URLEncoder.encode("ABCD", "gb2312");
//将要上传的内容写入流中
outputStream.writeBytes(content);
//刷新，关闭
outputStream.flush();
outputStream.close();
//取得数据
BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String line = null;
//使用循环体来获得数据
while((line = reader.readLine())!=null){
resultData += line + "\n";
}
if(!resultData.equals("")){
textView.setText(resultData);
}else{
textView.setText("读取的内容为null");
}
reader.close();
//关闭http连接
urlConnection.disconnect();
} catch (IOException e) {
// TODO Auto-generated catch block
Log.e(TAG, "IOException");
e.printStackTrace();
}
}else{
Log.e(TAG, "url null");
}
}
}
3、获取网络图片的代码：
[java] view
plaincopy
public class ImageActivity extends Activity {
private String TAG = "ImageActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.image);
ImageView imageView = (ImageView)findViewById(R.id.image);
Button button = (Button)findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(ImageActivity.this, MainActivity.class);
startActivity(intent);
}
});
String urlString = "http://www.eoeandroid.com/data/attachment/forum/201107/18/142935bbi8d3zpf3d0dd7z.jpg";
URL imageUrl = null;
Bitmap bitmap = null;
try{
imageUrl = new URL(urlString);
}catch (MalformedURLException e) {
// TODO: handle exception
Log.e(TAG, "MalformedURLException");
e.printStackTrace();
}
try{
HttpURLConnection connection = (HttpURLConnection)imageUrl.openConnection();
connection.setDoInput(true);
connection.connect();
//将得到的数据转换为InputStream
InputStream is = connection.getInputStream();
//将InputStream转换为Bitmap
bitmap = BitmapFactory.decodeStream(is);
is.close();
}catch (IOException e) {
// TODO: handle exception
Log.e(TAG, "IOException");
}
if(bitmap == null){
Log.i(TAG, "没取到数据");
}else{
imageView.setImageBitmap(bitmap);
}
}
}
注意：代码中的url地址中的ip：127.0.0.1需要修改成自己所需要的地址
其中有两个资源文件，两个jsp的内容分别如下：
http.jsp
[html] view
plaincopy
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<%
out.println("<h1>HTTP TEST<br/>http test</h1>");
%>
</body>
</html>
httpGet.jsp
[html] view
plaincopy
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<%
String type = request.getParameter("par");
String result = new String(type.getBytes("iso-8859-1"),"gb2312");
out.println("<h1>parameters:"+result+"</h1>");
%>
</body>
</html>
1、 HttpURLConnection 类通过Get方式获取网络资源：
[java] view
plaincopy
public class GetActivity extends Activity {
private String TAG = "GetActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.http);
TextView textView = (TextView)findViewById(R.id.text);
String urlString = "http://127.0.0.1:8080/test/httpGet.jsp?par=test";//http地址
String resultData = "";//获得的数据
URL url = null;
try {
url = new URL(urlString);//构造一个url对象
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException");
e.printStackTrace();
}
if(url!=null){
try {
HttpURLConnection urlConnection;//使用HttpURLConnection打开连接
urlConnection = (HttpURLConnection)url.openConnection();
InputStream stream = urlConnection.getInputStream();//得到读取的内容
InputStreamReader in = new InputStreamReader(stream);
BufferedReader buffere = new BufferedReader(in); //为输出创建BufferedReader
String line = null;
while((line = buffere.readLine()) != null){//使用while循环来取得获取的数据
resultData += line + "\n";//我们要在每一行的后面加上一个反斜杠来换行
}
if(resultData.equals("")){
textView.setText("没取到数据");
}else{
textView.setText(resultData);
}
in.close();//关闭InputStreamReader
urlConnection.disconnect();//关闭http连接
} catch (IOException e) {
Log.e(TAG, "IOException");
e.printStackTrace();
}
}else{
Log.e(TAG, "url null");
}
}
}
2、 HttpURLConnection 类通过Post方式获取网络资源：
[java] view
plaincopy
public class PostActivity extends Activity {
private String TAG="PostActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.http);
TextView textView = (TextView)findViewById(R.id.text);
String httpUrl = "http://127.0.0.1:8080/test/httpGet.jsp";
String resultData = "";
URL url = null;
try {
url = new URL(httpUrl);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
Log.e(TAG, "MalformedURLException");
e.printStackTrace();
}
if(url!=null){
//使用HttpURLConnection打开连接
HttpURLConnection urlConnection;
try {
urlConnection = (HttpURLConnection)url.openConnection();
//因为这个是post请求，需要设置为true
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
//设置以Post方法
urlConnection.setUseCaches(false);
urlConnection.setInstanceFollowRedirects(true);
//配置本次连接的Content-type
urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
//从url.openConnection()至此的配置必须在connect之前完成，要注意的是：
//connection.getOutputStream会隐含的进行connect
urlConnection.connect();
//DataOutputStream流
DataOutputStream outputStream = new DataOutputStream(urlConnection.getOutputStream());
//要上传的参数
String content = "par=" + URLEncoder.encode("ABCD", "gb2312");
//将要上传的内容写入流中
outputStream.writeBytes(content);
//刷新，关闭
outputStream.flush();
outputStream.close();
//取得数据
BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String line = null;
//使用循环体来获得数据
while((line = reader.readLine())!=null){
resultData += line + "\n";
}
if(!resultData.equals("")){
textView.setText(resultData);
}else{
textView.setText("读取的内容为null");
}
reader.close();
//关闭http连接
urlConnection.disconnect();
} catch (IOException e) {
// TODO Auto-generated catch block
Log.e(TAG, "IOException");
e.printStackTrace();
}
}else{
Log.e(TAG, "url null");
}
}
}
3、获取网络图片的代码：
[java] view
plaincopy
public class ImageActivity extends Activity {
private String TAG = "ImageActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.image);
ImageView imageView = (ImageView)findViewById(R.id.image);
Button button = (Button)findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(ImageActivity.this, MainActivity.class);
startActivity(intent);
}
});
String urlString = "http://www.eoeandroid.com/data/attachment/forum/201107/18/142935bbi8d3zpf3d0dd7z.jpg";
URL imageUrl = null;
Bitmap bitmap = null;
try{
imageUrl = new URL(urlString);
}catch (MalformedURLException e) {
// TODO: handle exception
Log.e(TAG, "MalformedURLException");
e.printStackTrace();
}
try{
HttpURLConnection connection = (HttpURLConnection)imageUrl.openConnection();
connection.setDoInput(true);
connection.connect();
//将得到的数据转换为InputStream
InputStream is = connection.getInputStream();
//将InputStream转换为Bitmap
bitmap = BitmapFactory.decodeStream(is);
is.close();
}catch (IOException e) {
// TODO: handle exception
Log.e(TAG, "IOException");
}
if(bitmap == null){
Log.i(TAG, "没取到数据");
}else{
imageView.setImageBitmap(bitmap);
}
}
}
注意：代码中的url地址中的ip：127.0.0.1需要修改成自己所需要的地址
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