Android(安卓)HTTP通讯

16lz 2021-01-24

这里有一个非常棒的http通讯的总结，我看了以后茅塞顿开。

先贴代码：

01	publicclassActivity1extendsActivity {

02

03	privatefinalString DEBUG_TAG ="System.out";

04

05	privateTextView mTextView;

06	privateButton mButton;

07

08	protectedvoidonCreate(Bundle savedInstanceState) {

09	super.onCreate(savedInstanceState);

10	setContentView(R.layout.main);

11

12	mTextView = (TextView) findViewById(R.id.TextView01);

13	mButton = (Button) findViewById(R.id.Button01);

14	mButton.setOnClickListener(newhttpListener());

15

}

16

17	// 设置按钮监听器

18	classhttpListenerimplementsOnClickListener {

19	publicvoidonClick(View v) {

20	refresh();

21

}

22

}

23

24	privatevoidrefresh() {

25	String httpUrl ="http://192.168.0.101:8080/Test/test.jsp";

26	// URL可以加参数

27	// String httpUrl =

28	// "http://192.168.0.101:8080/Test/test.jsp?par=abcdefg";

29	String resultData ="";

30	URL url =null;

31

try{

32	// 创建一个URL对象

33	url =newURL(httpUrl);

34	}catch(MalformedURLException e) {

35	Log.d(DEBUG_TAG,"create URL Exception");

36

}

37	// 声明HttpURLConnection对象

38	HttpURLConnection urlConn =null;

39	// 声明InputStreamReader对象

40	InputStreamReader in =null;

41	// 声明BufferedReader对象

42	BufferedReader buffer =null;

43	String inputLine =null;

44	if(url !=null) {

45

try{

46	// 使用HttpURLConnection打开连接

47	urlConn = (HttpURLConnection) url.openConnection();

48	// 得到读取的内容(流)

49	in =newInputStreamReader(urlConn.getInputStream());

50	// 创建BufferReader对象，输出时候用到

51	buffer =newBufferedReader(in);

52	// 使用循环来读取数据

53	while((inputLine = buffer.readLine()) !=null) {

54	// 在每一行后面加上换行

55	resultData += inputLine +"\n";

56

}

57	// 设置显示取的的内容

58	if(resultData !=null&& !resultData.equals("")) {

59	mTextView.setText(resultData);

60

}else{

61	mTextView.setText("读取的内容为空");

62

}

63	}catch(IOException e) {

64	e.printStackTrace();

65

}finally{

66

try{

67	// 关闭InputStreamReader

68	in.close();

69	// 关闭URL连接

70	urlConn.disconnect();

71	}catch(IOException e) {

72	e.printStackTrace();

73

}

74

}

75

}else{

76	Log.d(DEBUG_TAG,"URL is NULL");

77

}

78

}

79

}

第二种方式：

001	publicclassActivity2extendsActivity {

002

003	privatefinalString DEBUG_TAG ="System.out";

004

005	privateTextView mTextView;

006	privateButton mButton;

007

008	protectedvoidonCreate(Bundle savedInstanceState) {

009	super.onCreate(savedInstanceState);

010	setContentView(R.layout.main);

011

012	mTextView = (TextView) findViewById(R.id.TextView01);

013	mButton = (Button) findViewById(R.id.Button01);

014	mButton.setOnClickListener(newhttpListener());

015

}

016

017	// 设置按钮监听器

018	classhttpListenerimplementsOnClickListener {

019	publicvoidonClick(View v) {

020	refresh();

021

}

022

}

023

024	privatevoidrefresh() {

025	String httpUrl ="http://192.168.0.101:8080/Test/test.jsp";

026	String resultData ="";

027	URL url =null;

028

try{

029	// 创建一个URL对象

030	url =newURL(httpUrl);

031	}catch(MalformedURLException e) {

032	Log.d(DEBUG_TAG,"create URL Exception");

033

}

034	// 声明HttpURLConnection对象

035	HttpURLConnection urlConn =null;

036	// 声明InputStreamReader对象

037	InputStreamReader in =null;

038	// 声明BufferedReader对象

039	BufferedReader buffer =null;

040	String inputLine =null;

041	// 声明DataOutputStream流

042	DataOutputStream out =null;

043	if(url !=null) {

044

try{

045	// 使用HttpURLConnection打开连接

046	urlConn = (HttpURLConnection) url.openConnection();

047	// 因为这个是POST请求所以要设置为true

048	urlConn.setDoInput(true);

049	urlConn.setDoOutput(true);

050	// 设置POST方式

051	urlConn.setRequestMethod("POST");

052	// POST请求不能设置缓存

053	urlConn.setUseCaches(false);

054	urlConn.setInstanceFollowRedirects(false);

055	// 配置本次连接的Content-type，配置为application/x-www-form-urlencoded的

056	urlConn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

057	// 连接，从postUrl.openConnection()至此的配置必须要在connect之前完成

058	// 要注意的是connectio.getOutputStream会隐含的进行connect

059	urlConn.connect();

060	// DataOutputStream流

061	out =newDataOutputStream(urlConn.getOutputStream());

062	String content ="par="+ URLEncoder.encode("abcdefg","gb2312");

063	// 将要上传的内容写入流中

064	out.writeBytes(content);

065	// 得到读取的内容(流)

066	in =newInputStreamReader(urlConn.getInputStream());

067	// 创建BufferReader对象，输出时候用到

068	buffer =newBufferedReader(in);

069	// 使用循环来读取数据

070	while((inputLine = buffer.readLine()) !=null) {

071	// 在每一行后面加上换行

072	resultData += inputLine +"\n";

073

}

074	// 设置显示取的的内容

075	if(resultData !=null&& !resultData.equals("")) {

076	mTextView.setText(resultData);

077

}else{

078	mTextView.setText("读取的内容为空");

079

}

080	}catch(IOException e) {

081	e.printStackTrace();

082

}finally{

083

try{

084	// 刷新DataOutputStream流

085	out.flush();

086	// 关闭DataOutputStream流

087	out.close();

088	// 关闭InputStreamReader

089	in.close();

090	// 关闭URL连接

091	urlConn.disconnect();

092	}catch(IOException e) {

093	e.printStackTrace();

094

}

095

}

096

}else{

097	Log.d(DEBUG_TAG,"URL is NULL");

098

}

099

}

100

}

第三种方式

01	publicclassActivity3extendsActivity{

02	privateTextView mTextView;

03	privateButton mButton;

04

05	protectedvoidonCreate(Bundle savedInstanceState) {

06	super.onCreate(savedInstanceState);

07	setContentView(R.layout.main);

08	mTextView = (TextView) findViewById(R.id.TextView01);

09	mButton = (Button) findViewById(R.id.Button01);

10	mButton.setOnClickListener(newhttpListener());

11

}

12

13	// 设置按钮监听器

14	classhttpListenerimplementsOnClickListener {

15	publicvoidonClick(View v) {

16	String httpUrl ="http://192.168.0.101:8080/Test/test.jsp?par=HttpClient_android_Get";

17	// HttpGet连接对象

18	HttpGet httpRequest =newHttpGet(httpUrl);

19

try{

20	// 取的HttpClient对象

21	HttpClient httpclient =newDefaultHttpClient();

22	// 请求HttpClient，取的HttpResponse

23	HttpResponse httpResponse = httpclient.execute(httpRequest);

24

// 请求成功

25	if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

26	// 取的返回的字符串

27	String strResult = EntityUtils.toString(httpResponse.getEntity());

28	// 这个返回值可能会在行尾出现小方格

29	// 在TextView要显示的文字过滤掉回车符（"\r"）就可以正常显示了。

30	String strsResult = strResult.replace("\r","");

31	mTextView.setText(strsResult);

32

}else{

33	mTextView.setText("请求错误");

34

}

35	}catch(ClientProtocolException e) {

36	mTextView.setText(e.getMessage().toString());

37	}catch(IOException e) {

38	mTextView.setText(e.getMessage().toString());

39	}catch(Exception e) {

40	mTextView.setText(e.getMessage().toString());

41

}

42

}

43

}

44

}

第四种方式

01	publicclassActivity4extendsActivity{

02	privateTextView mTextView;

03	privateButton mButton;

04

05	protectedvoidonCreate(Bundle savedInstanceState) {

06	super.onCreate(savedInstanceState);

07	setContentView(R.layout.main);

08	mTextView = (TextView) findViewById(R.id.TextView01);

09	mButton = (Button) findViewById(R.id.Button01);

10	mButton.setOnClickListener(newhttpListener());

11

}

12

13	// 设置按钮监听器

14	classhttpListenerimplementsOnClickListener {

15	publicvoidonClick(View arg0) {

16	String httpUrl ="http://192.168.0.101:8080/Test/test.jsp";

17	// 创建HttpPost连接对象

18	HttpPost httpRequest =newHttpPost(httpUrl);

19	// 使用NameValuePair来保存要传递的Post参数

20	List params =newArrayList();

21	// 添加要传递的参数

22	params.add(newBasicNameValuePair("par","HttpClient_android_Post"));

23

try{

24

// 设置字符集

25	HttpEntity httpentity =newUrlEncodedFormEntity(params,"gb2312");

26	// 请求httpRequest

27	httpRequest.setEntity(httpentity);

28	// 取的默认的HttpClient

29	HttpClient httpclient =newDefaultHttpClient();

30	// 取的HttpResponse

31	HttpResponse httpResponse = httpclient.execute(httpRequest);

32	// HttpStatus.SC_OK表示连接成功

33	if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

34	// 取的返回的字符串

35	String strResult = EntityUtils.toString(httpResponse.getEntity());

36	// 这个返回值可能会在行尾出现小方格

37	// 在TextView要显示的文字过滤掉回车符（"\r"）就可以正常显示了。

38	String strsResult = strResult.replace("\r","");

39	mTextView.setText(strsResult);

40

}else{

41	mTextView.setText("请求错误");

42

}

43	}catch(ClientProtocolException e) {

44	mTextView.setText(e.getMessage().toString());

45	}catch(IOException e) {

46	mTextView.setText(e.getMessage().toString());

47	}catch(Exception e) {

48	mTextView.setText(e.getMessage().toString());

49

}

50

}

51

}

52

}

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