Android Http通信

Android 当中涉及到网络编程的部分经常会用到http通信，同时android也为我么您提供了HttpUrlConnection接口和HttpClient接口，大大的方便了开发。Http通信又分为两种方式：get和post，get可以uoqu静态页面，传入参数可以放在url当中，而post方法的传入参数则是放在httprequest（请求）当中。前面提到的HttpUrlConnection接口是Java当中的通信接口，而HttpClient则是java当中自带的通信接口。

android解析一个图片:

public class MainActivity extends AppCompatActivity {private WebView webView;private ImageView imageView;private Handler handler = new Handler();@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    webView = (WebView) findViewById(R.id.webview);    imageView = (ImageView) findViewById(R.id.imageview);    new HttpThread("http://h.hiphotos.baidu.com/image/pic/item/6c224f4a20a446239e8d311c9b22720e0cf3d70d.jpg", imageView, handler).start();}}public class HttpThread extends Thread {private String url;private WebView webView;private ImageView imageView;private Handler handler;/*public HttpThread(String url, WebView webView, Handler handler) {    this.url = url;    this.webView = webView;    this.handler = handler;}*/public HttpThread(String url, ImageView imageView, Handler handler) {    this.url = url;    this.imageView = imageView;    this.handler = handler;}@Overridepublic void run() {    try {         URL httpUrl = new URL(url);        try {            HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();            conn.setConnectTimeout(5000);            conn.setRequestMethod("GET");            conn.setDoInput(true);            /*final StringBuffer sb = new StringBuffer();            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));            String str;            while ((str = reader.readLine()) != null) {                sb.append(str);            }            handler.post(new Runnable() {                @Override                public void run() {                    webView.loadData(sb.toString(), "text/html;charset=utf-8", null);                }            });*/            InputStream is = conn.getInputStream();            FileOutputStream out = null;            File downloadFile = null;            String fileName = String.valueOf(System.currentTimeMillis());            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){                File parent = Environment.getExternalStorageDirectory();                downloadFile = new File(parent,fileName);                out = new FileOutputStream(downloadFile);            }            byte[] b = new byte[2*1024];            int len;            if (out != null){                while ((len = is.read(b))!=-1){                    out.write(b,0,len);                }            }            final Bitmap bitmap = BitmapFactory.decodeFile(downloadFile.getAbsolutePath());            handler.post(new Runnable() {                @Override                public void run() {                   imageView.setImageBitmap(bitmap);                }            });       } catch (IOException e) {            e.printStackTrace();        }        } catch (MalformedURLException e) {        e.printStackTrace();    } }}

与服务器之间的交互:

public class RegistActivity extends AppCompatActivity {private EditText  nameET,ageET;private Button    submitBT;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.layout_regist);    nameET = (EditText)findViewById(R.id.name_edit);    ageET = (EditText)findViewById(R.id.age_edit);    submitBT = (Button)findViewById(R.id.button);    submitBT.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            String url = "http://192.168.16.126:8080/HelloWorld/MyServlet";            String name = nameET.getText().toString();            String age = ageET.getText().toString();           new HttpThread1(url, name, age).start();                     }    });} }public class HttpThread1 extends Thread {private String url;private String name;private String age;public HttpThread1(String url, String name, String age) {    this.url = url;    this.name = name;    this.age = age;}@Overridepublic void run() {   // doGet();    doPost(); }private void doPost() {    try {        Properties properties = System.getProperties();        properties.list(System.out);        URL httpUrl = new URL(url);        HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();        conn.setRequestMethod("POST");        conn.setReadTimeout(5000);        OutputStream out = conn.getOutputStream();        String content = "name="+name+"&age="+age;        out.write(content.getBytes());        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));        StringBuffer sb = new StringBuffer();        String str;        while ((str=reader.readLine())!=null){            sb.append(str);        }        System.out.println(sb.toString());    } catch (MalformedURLException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }}public void doGet(){    try {        url = url + "?name=" + URLEncoder.encode(name,"utf-8") + "&age=" + age;    } catch (UnsupportedEncodingException e) {        e.printStackTrace();    }    try {        URL httpUrl = new URL(url);        HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();        conn.setRequestMethod("GET");        conn.setReadTimeout(5000);        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));        String  str = null;        StringBuffer sb = new StringBuffer();        while ((str = reader.readLine())!=null){            sb.append(str);        }        System.out.println("result:" + sb.toString());    } catch (MalformedURLException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }} }

使用HttpClient的方式交互:

public class RegistActivity extends AppCompatActivity {private EditText  nameET,ageET;private Button    submitBT;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.layout_regist);    nameET = (EditText)findViewById(R.id.name_edit);    ageET = (EditText)findViewById(R.id.age_edit);    submitBT = (Button)findViewById(R.id.button);    submitBT.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            String url = "http://192.168.16.126:8080/HelloWorld/MyServlet";            String name = nameET.getText().toString();            String age = ageET.getText().toString();           // url = url + "?name=" + name + "&age=" + age;            new HttpClientThread(url,name,age).start();        }    });}}public class HttpClientThread extends Thread {private String url;private String name;private String age;/*public HttpClientThread(String url){    this.url = url;}*/public HttpClientThread(String url, String name, String age) {    this.url = url;    this.name = name;    this.age = age;}@Overridepublic void run() {   // doHttpClientGet();    doHttpClientPost(); }private void doHttpClientPost() {    HttpClient client = new DefaultHttpClient();    HttpPost post = new HttpPost(url);    ArrayList list = new ArrayList<>();    list.add(new BasicNameValuePair("name",name));    list.add(new BasicNameValuePair("age",age));    try {        post.setEntity(new UrlEncodedFormEntity(list));        HttpResponse response = client.execute(post);        if (response.getStatusLine().getStatusCode()==HttpStatus.SC_OK){            String content = EntityUtils.toString(response.getEntity());        }    } catch (IOException e) {        e.printStackTrace();    }}public void doHttpClientGet(){    try {        HttpGet httpget = new HttpGet(url);        HttpClient client = new DefaultHttpClient();        HttpResponse response = client.execute(httpget);        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){            String content = EntityUtils.toString(response.getEntity());            System.out.println("content---------->" + content);        }    } catch (ClientProtocolException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }}}

由此可以得出结论: get与post的区别?

1.get通常是从服务器上获取数据，post通常是向服务器传送数据。
2.get是把参数数据队列加到表单的 ACTION属性所指的URL中，值和表单内各个字段一一对应，在URL中可以看到，实际上就是URL拼接方式。post是通过HTTPpost机制，将表单内各个字段与其内容放置在HTML HEADER内一起传送到ACTION属性所指的URL地址。
3.对于get方式，服务器端用 Request.QueryString获取变量的值，对于post方式，服务器端用Request.Form获取提交的数据。
4.get 传送的数据量较小，不能大于1KB[IE,Oher:4]。post传送的数据量较大，一般被默认为不受限制。但理论上，IIS4中最大量为80KB，IIS5中为100KB。
5.get安全性非常低，post安全性较高。

更多相关文章

随机推荐