本系列學(xué)習(xí)筆記第10章
前言
打算把android基本知識點寫一個系列，旨在把android基礎(chǔ)書，例如《Android 第一行代碼 第2版》、《愛上android》、《瘋狂android講義》等書的一些知識點記錄一下，會持續(xù)更新內(nèi)容，為了方便自己復(fù)習(xí)，也希望可以幫助到大家！
1、HTTP協(xié)議
1.1 URL簡介
URL的全稱是統(tǒng)一資源定位符，通過一個URL能找到互聯(lián)網(wǎng)上唯一 的一個資源，URL就是資源的地址、位置。
URL的基本格式 = 協(xié)議://主機地址/路徑
協(xié)議：不同的協(xié)議，代表不同資源的查找方式、資源傳輸方式
主機地址：存放資源的主機IP地址或者域名
路徑：資源在主機中的具體位置
URL中常見的協(xié)議如下：
HTTP:超文本傳輸協(xié)議，訪問的是遠程網(wǎng)絡(luò)資源，格式是http://
file:訪問的是本機的文件資源，格式是file://
mailto:訪問的是電子郵件地址，格式是mailto:
FTP:訪問的是共享主機的文件資源，格式是ftp://
1.2 HTTP簡介
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1.3 GET與POST對比
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2、WebView的用法
2.1 加載網(wǎng)絡(luò)頁面的用法
public class MainActivity extends AppCompatActivity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.web_view);
WebSettings settings = webView.getSettings();
//支持JavaScript腳本
settings.setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient());
webView.loadUrl("http://www.baidu.com");
}
}
2.2 加載本地靜態(tài)頁面的用法
首先先把html等文件放在如下的文件夾中
image.png
webView.loadUrl("file:///android_asset/apply_notice.html");
2.3 WebView的設(shè)置用法
//支持獲取手勢焦點，輸入用戶名、密碼或其他
webView.requestFocusFromTouch();
//支持js,這樣有潛在的安全隱患,無需要,建議關(guān)閉
webSettings.setJavaScriptEnabled(true);
//提高渲染的優(yōu)先級，高版本廢棄了。
webSettings.setRenderPriority(WebSettings.RenderPriority.HIGH);
// 設(shè)置自適應(yīng)屏幕，兩者合用
webSettings.setUseWideViewPort(true); //將圖片調(diào)整到適合webview的大小
webSettings.setLoadWithOverviewMode(true); // 縮放至屏幕的大小
webSettings.setSupportZoom(true); //支持縮放，默認為true。是下面那個的前提。
//若下面是false，則該WebView不可縮放，這個不管設(shè)置什么都不能縮放。
webSettings.setBuiltInZoomControls(true); //設(shè)置內(nèi)置的縮放控件。
webSettings.setDisplayZoomControls(false); //隱藏原生的縮放控件
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN); //支持內(nèi)容重新布局
webSettings.supportMultipleWindows(); //支持多窗口
webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); //關(guān)閉webview中緩存
webSettings.setAllowFileAccess(true); //設(shè)置可以訪問文件
webSettings.setNeedInitialFocus(true); //當webview調(diào)用requestFocus時為webview設(shè)置節(jié)點
webSettings.setJavaScriptCanOpenWindowsAutomatically(true); //支持通過JS打開新窗口
webSettings.setLoadsImagesAutomatically(true); //支持自動加載圖片
webSettings.setDefaultTextEncodingName("utf-8");//設(shè)置編碼格式
//----緩存
//根據(jù)網(wǎng)頁中cache-control決定是否從網(wǎng)絡(luò)上取數(shù)據(jù)。
webSettings.setCacheMode(WebSettings.LOAD_DEFAULT);
webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);//沒網(wǎng)，則從本地獲取，即離線加載
webSettings.setDomStorageEnabled(true); // 開啟 DOM storage API 功能
webSettings.setDatabaseEnabled(true); //開啟 database storage API 功能
webSettings.setAppCacheEnabled(true);//開啟 Application Caches 功能
String cacheDirPath = getCacheDir().getAbsolutePath();
//設(shè)置 Application Caches 緩存目錄
//每個 Application 只調(diào)用一次 WebSettings.setAppCachePath()
webSettings.setAppCachePath(cacheDirPath);
//Android 5.0上 Webview 默認不允許加載 Http 與 Https 混合內(nèi)容,加下下面的配置就解決了.
webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
2.4 WebViewClient的介紹
WebViewClient就是幫助WebView 處理各種通知，請求事件的。
WebViewClient mWebViewClient = new WebViewClient() {
//在網(wǎng)頁上的所有加載都經(jīng)過這個方法,這個函數(shù)我們可以做很多操作。
//比如獲取url，查看url.contains(“add”)，進行添加操作
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
// 21版本引入 同上
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
view.loadUrl(request.getUrl().toString());
return true;
}
//這個事件就是開始載入頁面調(diào)用的，我們可以設(shè)定一個loading的頁面，告訴用戶程序在等待網(wǎng)絡(luò)響應(yīng)。
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
//在頁面加載結(jié)束時調(diào)用。同樣道理，我們可以關(guān)閉loading 條，切換程序動作。
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
// 在加載頁面資源時會調(diào)用，每一個資源（比如圖片）的加載都會調(diào)用一次。
@Override
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
}
// 攔截替換網(wǎng)絡(luò)請求數(shù)據(jù), API 11開始引入，API 21棄用
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
return super.shouldInterceptRequest(view, url);
}
// 攔截替換網(wǎng)絡(luò)請求數(shù)據(jù), 從API 21開始引入
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
return super.shouldInterceptRequest(view, request);
}
//報告錯誤信息 API 21 廢棄
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
}
//報告錯誤信息 API 21 引用
@Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
super.onReceivedError(view, request, error);
}
//接收http 錯誤信息
@Override
public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
super.onReceivedHttpError(view, request, errorResponse);
}
//應(yīng)用程序重新請求網(wǎng)頁數(shù)據(jù)
@Override
public void onFormResubmission(WebView view, Message dontResend, Message resend) {
super.onFormResubmission(view, dontResend, resend);
}
//更新歷史記錄
@Override
public void doUpdateVisitedHistory(WebView view, String url, boolean isReload) {
super.doUpdateVisitedHistory(view, url, isReload);
}
//重寫此方法可以讓webview處理https請求。
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
super.onReceivedSslError(view, handler, error);
}
//獲取返回信息授權(quán)請求
@Override
public void onReceivedHttpAuthRequest(WebView view, HttpAuthHandler handler, String host, String realm) {
super.onReceivedHttpAuthRequest(view, handler, host, realm);
}
@Override
public boolean shouldOverrideKeyEvent(WebView view, KeyEvent event) {
return super.shouldOverrideKeyEvent(view, event);
}
//Key事件未被加載時調(diào)用
@Override
public void onUnhandledKeyEvent(WebView view, KeyEvent event) {
super.onUnhandledKeyEvent(view, event);
}
// WebView發(fā)生改變時調(diào)用
@Override
public void onScaleChanged(WebView view, float oldScale, float newScale) {
super.onScaleChanged(view, oldScale, newScale);
}
};
webView.setWebViewClient(mWebViewClient);
2.5 WebChromeClient 的介紹
WebChromeClient 是輔助WebView處理JavaScript對話框、網(wǎng)站圖標、網(wǎng)站標題、加載進度等，下面方法中的代碼都是android端自己處理。
WebChromeClient mWebChromeClient = new WebChromeClient() {
//獲得網(wǎng)頁的加載進度
@Override
public void onProgressChanged(WebView view, int newProgress) {
}
//獲取Web頁中的title用來設(shè)置自己界面中的title
//當加載出錯的時候，比如無網(wǎng)絡(luò)，這時onReceiveTitle中獲取的標題為 找不到該網(wǎng)頁,
//因此建議當觸發(fā)onReceiveError時，不要使用獲取到的title
@Override
public void onReceivedTitle(WebView view, String title) {
}
//獲取Web頁icon
@Override
public void onReceivedIcon(WebView view, Bitmap icon) {
//
}
//創(chuàng)建窗口
@Override
public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, Message resultMsg) {
//
return true;
}
//關(guān)閉窗口
@Override
public void onCloseWindow(WebView window) {
}
//處理alert彈出框，html 彈框的一種方式
@Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
//
return true;
}
//處理confirm彈出框
@Override
public boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult
result) {
//
return true;
}
//處理prompt彈出框
@Override
public boolean onJsConfirm(WebView view, String url, String message, JsResult result) {
//
return true;
}
};
mWebView.setWebChromeClient (mWebChromeClient );
2.6 WebView常用的方法
2.6.1 前進、后退
webView.goBack();//后退
webView.goForward();//前進
//以當前的index為起始點前進或者后退到歷史記錄中指定的steps， 如果steps為負數(shù)則為后退，正數(shù)則為前進
// webView.goBackOrForward(intsteps);
webView.canGoForward();//判斷是否可以前進
webView.canGoBack(); //判斷是否可以后退
//按鍵事件
public boolean onKeyDown(int keyCode, KeyEvent event) {
//當點擊的返回鍵 && webView可以回退
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack(); //回退界面
return true;
}
//沒有點擊返回鍵或者webView不能回退就處理默認的事件
return super.onKeyDown(keyCode, event);
}
2.6.2 清除緩存數(shù)據(jù)
webView.clearCache(true);//清除網(wǎng)頁訪問留下的緩存，由于內(nèi)核緩存是全局的因此這個方法不僅僅針對webview而是針對整個應(yīng)用程序.
webView.clearHistory();//清除當前webview訪問的歷史記錄，只會webview訪問歷史記錄里的所有記錄除了當前訪問記錄.
webView.clearFormData();//這個api僅僅清除自動完成填充的表單數(shù)據(jù)，并不會清除WebView存儲到本地的數(shù)據(jù)。
2.6.3 WebView的狀態(tài)
webView.onResume(); //激活WebView為活躍狀態(tài)，能正常執(zhí)行網(wǎng)頁的響應(yīng)
webView.onPause();//當頁面被失去焦點被切換到后臺不可見狀態(tài)，需要執(zhí)行onPause動過， onPause動作通知內(nèi)核暫停所有的動作，比如DOM的解析、plugin的執(zhí)行、JavaScript執(zhí)行。
webView.pauseTimers();//當應(yīng)用程序被切換到后臺我們使用了webview， 這個方法不僅僅針對當前的webview而是全局的全應(yīng)用程序的webview，它會暫停所有webview的layout，parsing，javascripttimer。降低CPU功耗。
webView.resumeTimers();//恢復(fù)pauseTimers時的動作。
webView.destroy();//銷毀，關(guān)閉了Activity時，音樂或視頻，還在播放。就必須銷毀
注意點，當destroy調(diào)用destroy方法時，destroy仍然綁定在Activity上，這是因為構(gòu)建自定義的webview時傳入了該Activity的Context對象，因此需要從父容器中移除webview，再對webview進行destroy銷毀。
3、使用HTTP協(xié)議訪問網(wǎng)絡(luò)
3.1 使用HttpURLConnection
3.1.1 GET請求
/**
* Get 請求
* @param mUrl
*/
private void sendRequestWithHttpURLConnection(final String mUrl){
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(mUrl);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
connection.setDoInput(true);
connection.setDoOutput(true);
InputStream in = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
StringBuilder respond = new StringBuilder();
String line;
while ((line = reader.readLine()) != null){
respond.append(line);
}
//將接口返回的數(shù)據(jù)處理
} catch (IOException e) {
e.printStackTrace();
}finally {
if (reader != null){
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (connection != null){
connection.disconnect();
}
}
}
}).start();
}
3.1.2 POST請求
/**
* post 請求
* @param mUrl
*/
private void sendRequestWithHttpURLConnection_post(final String mUrl){
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(mUrl);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
connection.setDoInput(true);
connection.setDoOutput(true);
DataOutputStream out = new DataOutputStream(connection.getOutputStream());
out.writeBytes("username=admin&password=123456");
InputStream in = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
StringBuilder respond = new StringBuilder();
String line;
while ((line = reader.readLine()) != null){
respond.append(line);
}
//將接口返回的數(shù)據(jù)處理
} catch (IOException e) {
e.printStackTrace();
}finally {
if (reader != null){
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (connection != null){
connection.disconnect();
}
}
}
}).start();
}
3.1.3 HttpURLConnection基本封裝工具類
/**HttpURLConnection工具類*/
public class NetUtils {
/**post請求*/
public static String post(String url, String content) {
HttpURLConnection conn = null;
try {
// 創(chuàng)建一個URL對象
URL mURL = new URL(url);
// 調(diào)用URL的openConnection()方法,獲取HttpURLConnection對象
conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("POST");// 設(shè)置請求方法為post
conn.setReadTimeout(5000);// 設(shè)置讀取超時為5秒
conn.setConnectTimeout(10000);// 設(shè)置連接網(wǎng)絡(luò)超時為10秒
conn.setDoOutput(true);// 設(shè)置此方法,允許向服務(wù)器輸出內(nèi)容
// post請求的參數(shù)
String data = content;
// 獲得一個輸出流,向服務(wù)器寫數(shù)據(jù),默認情況下,系統(tǒng)不允許向服務(wù)器輸出內(nèi)容
OutputStream out = conn.getOutputStream();// 獲得一個輸出流,向服務(wù)器寫數(shù)據(jù)
out.write(data.getBytes());
out.flush();
out.close();
//獲取服務(wù)器返回碼 調(diào)用此方法就不必再使用conn.connect()方法
int responseCode = conn.getResponseCode();
if (responseCode == 200) { //200代表請求成功
InputStream is = conn.getInputStream();
String response = getStringFromInputStream(is);
return response;
} else {
throw new NetworkErrorException("response status is "+responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();// 關(guān)閉連接
}
}
return null;
}
/**get請求*/
public static String get(String url) {
HttpURLConnection conn = null;
try {
// 利用string url構(gòu)建URL對象
URL mURL = new URL(url);
conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(5000);
conn.setConnectTimeout(10000);
int responseCode = conn.getResponseCode();
if (responseCode == 200) {
InputStream is = conn.getInputStream();
String response = getStringFromInputStream(is);
return response;
} else {
throw new NetworkErrorException("response status is "+responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();
}
}
return null;
}
// 把InputStream轉(zhuǎn)換成String
private static String getStringFromInputStream(InputStream is)
throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
// 模板代碼 必須熟練
byte[] buffer = new byte[1024];
int len = -1;
while ((len = is.read(buffer)) != -1) {
os.write(buffer, 0, len);
}
is.close();
// 把流中的數(shù)據(jù)轉(zhuǎn)換成字符串,采用的編碼是utf-8(模擬器默認編碼)
String state = os.toString();
os.close();
return state;
}
}
3.2 使用OkHttp
image.png
3.2.1 GET請求
try {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("http://www.baidu.com")
.build();
Response response = client.newCall(request).execute();
String string = response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
3.2.2 POST請求
try {
OkHttpClient client = new OkHttpClient();
RequestBody requestBody = new FormBody.Builder()
.add("username", "admin")
.add("password", "123456")
.build();
Request request = new Request.Builder()
.url("http://www.baidu.com")
.post(requestBody)
.build();
Response response = client.newCall(request).execute();
String string = response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
4、解析XML格式數(shù)據(jù)
4.1 Pull解析方式
image.png
private String xml = "<apps>\n" +
"\t<app>\n" +
"\t\t<id>1</id>\n" +
"\t\t<name>1</name>\n" +
"\t\t<version>1</version>\n" +
"\t</app>\n" +
"\t<app>\n" +
"\t\t<id>1</id>\n" +
"\t\t<name>1</name>\n" +
"\t\t<version>1</version>\n" +
"\t</app>\n" +
"\t<app>\n" +
"\t\t<id>1</id>\n" +
"\t\t<name>1</name>\n" +
"\t\t<version>1</version>\n" +
"\t</app>\n" +
"</apps>";
private void parseXMLWithPull(String xmlData){
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xmlPullParser = factory.newPullParser();
xmlPullParser.setInput(new StringReader(xmlData));
int eventType = xmlPullParser.getEventType();
String id = "";
String name = "";
String version = "";
while (eventType != XmlPullParser.END_DOCUMENT){
String nodeName = xmlPullParser.getName();
switch (eventType){
//開始解析某個節(jié)點
case XmlPullParser.START_TAG:
if ("id".equals(nodeName)){
id = xmlPullParser.nextText();
}else if ("name".equals(nodeName)){
name = xmlPullParser.nextText();
}else if ("version".equals(nodeName)){
version = xmlPullParser.nextText();
}
break;
case XmlPullParser.END_TAG:
if ("app".equals(nodeName)){
Log.d(TAG,"id is:"+id);
Log.d(TAG,"name is:"+name);
Log.d(TAG,"version is:"+version);
}
break;
default:
break;
}
eventType = xmlPullParser.next();
}
} catch (Exception e) {
e.printStackTrace();
}
}
4.2 SAX解析方式
ContentHandler.java文件
public class ContentHandler extends DefaultHandler {
private static final String TAG = ContentHandler.class.getSimpleName();
private String nodename;
private StringBuilder id;
private StringBuilder name;
private StringBuilder version;
@Override
public void startDocument() throws SAXException {
id = new StringBuilder();
name = new StringBuilder();
version = new StringBuilder();
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
super.startElement(uri, localName, qName, attributes);
//記錄當前節(jié)點名
nodename = localName;
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
super.characters(ch, start, length);
if ("id".equals(nodename)){
id.append(ch,start,length);
}else if ("name".equals(nodename)){
name.append(ch,start,length);
}else if ("version".equals(nodename)){
version.append(ch, start, length);
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
super.endElement(uri, localName, qName);
if ("app".equals(localName)){
Log.d(TAG,"id is : "+id.toString().trim());
Log.d(TAG,"name is : "+name.toString().trim());
Log.d(TAG,"version is : "+version.toString().trim());
id.setLength(0);
name.setLength(0);
version.setLength(0);
}
}
@Override
public void endDocument() throws SAXException {
super.endDocument();
}
private void parseXMLWithSAX(String xmlData){
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
XMLReader xmlReader = factory.newSAXParser().getXMLReader();
ContentHandler handler = new ContentHandler();
xmlReader.setContentHandler(handler);
xmlReader.parse(new InputSource(new StringReader(xmlData)));
} catch (SAXException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
5、解析JSON格式數(shù)據(jù)
5.1 使用JSONObject
private static final String jsonStr = "[\n" +
"\n" +
"{\"id\":\"5\",\"version\":\"5\",\"name\":\"5\"},\n" +
"{\"id\":\"6\",\"version\":\"6\",\"name\":\"6\"},\n" +
"{\"id\":\"7\",\"version\":\"7\",\"name\":\"7\"}\n" +
"\n" +
"]";
private void parseJSONWithJSONObject(String jsonData){
try {
JSONArray jsonArray = new JSONArray(jsonData);
for (int i = 0;i < jsonArray.length();i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String id = jsonObject.getString("id");
String name = jsonObject.getString("name");
String version = jsonObject.getString("version");
Log.d(TAG,"id is :"+id);
Log.d(TAG,"name is :"+name);
Log.d(TAG,"version is :"+version);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
6.2 使用GSON
可以將一段JSON格式的字符串自動轉(zhuǎn)換成一個對象，從而不需要我們再去手動編寫代碼去解析了
implementation 'com.google.code.gson:gson:2.2.4'
5.2.1 解析一個json字符串（對象）
例如，{"name":"Tom","age":25}
public class Person {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Gson gson = new Gson();
Person person = gson.fromJson(json_object, Person.class);
Log.d(TAG,"person.getName()============"+person.getName());
對于如下的數(shù)據(jù)，例如：
{
"code":"200",
"message":"success",
"data":
[
{"name":"Tom1","age":1},
{"name":"Tom2","age":2},
{"name":"Tom3","age":3}
]
}
上面的方法同樣有效
5.2.2 解析一個json數(shù)組
例如：
[
{"name":"Tom1","age":1},
{"name":"Tom2","age":2},
{"name":"Tom3","age":3}
]
public class Person {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Gson gson = new Gson();
List<Person> peoplelsit = gson.fromJson(json_arr,new TypeToken<List<Person>>(){}.getType());
6、網(wǎng)絡(luò)編程的最佳實踐
HttpCallbackListener.java文件
public interface HttpCallbackListener {
void onFinish(String response);
void onError(Exception e);
}
HttpUtil.java文件
public class HttpUtil {
public static void sendHttpRequest(final String address, final HttpCallbackListener listener) {
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
try {
URL url = new URL(address);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
connection.setDoInput(true);
connection.setDoOutput(true);
InputStream in = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
if (listener != null) {
// 回調(diào)onFinish()方法
listener.onFinish(response.toString());
}
} catch (Exception e) {
if (listener != null) {
// 回調(diào)onError()方法
listener.onError(e);
}
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
}).start();
}
public static void sendOkHttpRequest(final String address, final okhttp3.Callback callback) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(address)
.build();
client.newCall(request).enqueue(callback);
}
}
