安卓开发网络数据请求

最新推荐文章于 2023-05-21 16:25:53 发布
原创最新推荐文章于 2023-05-21 16:25:53 发布 · 733 阅读
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1将访问的路径转换成URL。

URL url = new URL(path);

2，通过URL获取连接。

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

3，设置请求方式
conn.setRequestMethod("GET");
4，设置连接超时时间
conn.setConnectTimeout(5000);
5，设置读取时间
conn.setConnectTimeout(5000);
6，设置请求头的信息。
conn.setRequestProperty(User-Agent, Mozilla/5.0 (compatible;
 MSIE 9.0; Windows NT 6.1;
 Trident/5.0));
7，获取响应码
if (conn.getResponseCode()
 == HttpURLConnection.HTTP_OK) {

             InputStream  is = conn.getInputStream();

            }
8，请求码200，表明请求成功，获取返回内容的输入流
/**     * 将输入流转换成字符串
     *
     * @param
 is
     *           
 从网络获取的输入流
     * @return
     */
    public static String
 streamToString(InputStream is) {
        try {
            ByteArrayOutputStream
 baos = new ByteArrayOutputStream();
            byte[]
 buffer = new byte[1024];
            int len
 = 0;
            while ((len
 = is.read(buffer)) != -1) {
                baos.write(buffer, 0,
 len);
            }
            baos.close();
            is.close();
            byte[]
 byteArray = baos.toByteArray();
            return new String(byteArray);
        } catch (Exception
 e) {
            Log.e(tag,
 e.toString());
            return null;
        }
    }
　　HttpUrlConnection
/**
     * 通过HttpUrlConnection发送GET请求
     *
     * @param
 username
     * @param
 password
     * @return
     */
    public static String
 loginByGet(String username, String password) {
        String path =
 http://192.168.0.107:8080/WebTest/LoginServerlet?username= + username + &password= + password;
        try {
            URL url
 = new URL(path);
            HttpURLConnection
 conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setRequestMethod(GET);
            int code
 = conn.getResponseCode();
            if (code
 == 200) {
                InputStream
 is = conn.getInputStream(); // 字节流转换成字符串
                return StreamTools.streamToString(is);
            } else {
                return 网络访问失败;
            }
        } catch (Exception
 e) {
            e.printStackTrace();
            return 网络访问失败;
        }
/**
     * 通过HttpUrlConnection发送POST请求
     *
     * @param
 username
     * @param
 password
     * @return
     */
    public static String
 loginByPost(String username, String password) {
        String path =
 http://192.168.0.107:8080/WebTest/LoginServerlet;
        try {
            URL url
 = new URL(path);
            HttpURLConnection
 conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setRequestMethod(POST);
            conn.setRequestProperty(Content-Type,
 application/x-www-form-urlencoded);
            String
 data = username= + username + &password= + password;
            conn.setRequestProperty(Content-Length,
 data.length() + );
            // POST方式，其实就是浏览器把数据写给服务器
            conn.setDoOutput(true); //
 设置可输出流
            OutputStream
 os = conn.getOutputStream(); // 获取输出流
            os.write(data.getBytes()); //
 将数据写给服务器
            int code
 = conn.getResponseCode();
            if (code
 == 200) {
                InputStream
 is = conn.getInputStream();
                return StreamTools.streamToString(is);
            } else {
                return 网络访问失败;
            }
        } catch (Exception
 e) {
            e.printStackTrace();
            return 网络访问失败;
        }
    }

HttpClient
/**
     * 通过HttpClient发送GET请求
     *
     * @param
 username
     * @param
 password
     * @return
     */
    public static String
 loginByHttpClientGet(String username, String password) {
        String path =
 http://192.168.0.107:8080/WebTest/LoginServerlet?username=
                + username
 + &password= + password;
        HttpClient
 client = new DefaultHttpClient(); //
 开启网络访问客户端
        HttpGet httpGet
 = new HttpGet(path); //
 包装一个GET请求
        try {
            HttpResponse
 response = client.execute(httpGet); // 客户端执行请求
            int code
 = response.getStatusLine().getStatusCode(); // 获取响应码
            if (code
 == 200) {
                InputStream
 is = response.getEntity().getContent(); // 获取实体内容
                String
 result = StreamTools.streamToString(is); // 字节流转字符串
                return result;
            } else {
                return 网络访问失败;
            }
        } catch (Exception
 e) {
            e.printStackTrace();
            return 网络访问失败;
        }
    }
/**
     * 通过HttpClient发送POST请求
     *
     * @param
 username
     * @param
 password
     * @return
     */
    public static String
 loginByHttpClientPOST(String username, String password) {
        String path =
 http://192.168.0.107:8080/WebTest/LoginServerlet;
        try {
            HttpClient
 client = new DefaultHttpClient(); //
 建立一个客户端
            HttpPost
 httpPost = new HttpPost(path); //
 包装POST请求
            // 设置发送的实体参数
            List<namevaluepair>
 parameters = new ArrayList<namevaluepair>();
            parameters.add(new BasicNameValuePair(username,
 username));
            parameters.add(new BasicNameValuePair(password,
 password));
            httpPost.setEntity(new UrlEncodedFormEntity(parameters,
 UTF-8));
            HttpResponse
 response = client.execute(httpPost); // 执行POST请求
            int code
 = response.getStatusLine().getStatusCode();
            if (code
 == 200) {
                InputStream
 is = response.getEntity().getContent();
                String
 result = StreamTools.streamToString(is);
                return result;
            } else {
                return 网络访问失败;
            }
        } catch (Exception
 e) {
            e.printStackTrace();
            return 访问网络失败;
        }
    }</namevaluepair></namevaluepair>