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>