Android使用HttpClient进行GET请求和POST请求

Android Android使用HttpClient进行GET请求和POST请求

一。客户端
1.请求处理


public class Utils {
	private static String uriLogin = "http://10.0.2.2:8080/ForAndroid/servlets/WatchLogin";
	/**
	 * 使用post的方式登录
	 */
	public static String loginOfPost(String userName, String password) {
		HttpClient client = null;
		try {
			// 1.定义post请求的参数
			List<NameValuePair> parameters = new ArrayList<NameValuePair>();
			parameters.add(new BasicNameValuePair("username", userName));
			parameters.add(new BasicNameValuePair("password", password));
			
			// 把post请求的参数包装了一层.
			// 不写编码名称服务器收数据时乱码. 需要指定字符集为utf-8
			UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");
			
			// 2.定义post方法
			HttpPost post = new HttpPost(uriLogin);
			
			// 设置请求头消息
			//post.addHeader("Content-Length", "20");
			
			// 3.设置参数.
			post.setEntity(entity);
			
			// 4.定义一个客户端
			client = new DefaultHttpClient();
			
			// 5.执行post方法, 返回一个HttpResponse对象,包含了状态信息和服务器返回的数据
			HttpResponse response = client.execute(post);
			
			// 6.使用响应对象, 获得状态码, 处理内容
			int statusCode = response.getStatusLine().getStatusCode();	// 获得状态码
			if(statusCode == 200) {
				// 使用响应对象获得实体, 获得输入流
				InputStream is = response.getEntity().getContent();
				String text = getStringFromInputStream(is);
				return text;
			} else {
				System.err.println("请求失败: " + statusCode);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(client != null) {
				client.getConnectionManager().shutdown();	// 关闭连接和释放资源
			}
		}
		return null;
	}

	/**
	 * 使用get的方式登录
	 */
	public static String loginOfGet(String userName, String password) {
		HttpClient client = null;
		try {
			// 1.定义请求参数
			String data = "username=" + userName + "&password=" + password;
			
			// 2.定义一个get请求方法
			HttpGet get = new HttpGet(uriLogin + "?" + data);
			
			// 3.定义一个客户端
			client = new DefaultHttpClient();
			
			// 4.执行, 请求网络。
			// response 服务器相应对象, 其中包含了状态信息和服务器返回的数据
			HttpResponse response = client.execute(get);
			
			// 5.获得响应码，处理数据
			int statusCode = response.getStatusLine().getStatusCode();
			if(statusCode == 200) {
				InputStream is = response.getEntity().getContent();
				String text = getStringFromInputStream(is);
				return text;
			} else {
				System.err.println("请求失败: " + statusCode);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(client != null) {
				// 关闭连接, 和释放资源
				client.getConnectionManager().shutdown();
			}
		}
		return null;
	}
	
	/**
	 * 根据流返回一个字符串信息
	 */
	private static String getStringFromInputStream(InputStream is) throws IOException {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = -1;
		
		while((len = is.read(buffer)) != -1) {
			baos.write(buffer, 0, len);
		}
		is.close();
		
		String html = baos.toString();	// 把流中的数据转换成字符串, 采用的编码是: utf-8
		
		baos.close();
		return html;
	}
}

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public class Utils {

private static String uriLogin = "http://10.0.2.2:8080/ForAndroid/servlets/WatchLogin";

/**

* 使用post的方式登录

public static String loginOfPost(String userName, String password) {

HttpClient client = null;

try {

// 1.定义post请求的参数

List<NameValuePair> parameters = new ArrayList<NameValuePair>();

parameters.add(new BasicNameValuePair("username", userName));

parameters.add(new BasicNameValuePair("password", password));

// 把post请求的参数包装了一层.

// 不写编码名称服务器收数据时乱码. 需要指定字符集为utf-8

UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");

// 2.定义post方法

HttpPost post = new HttpPost(uriLogin);

// 设置请求头消息

//post.addHeader("Content-Length", "20");

// 3.设置参数.

post.setEntity(entity);

// 4.定义一个客户端

client = new DefaultHttpClient();

// 5.执行post方法, 返回一个HttpResponse对象,包含了状态信息和服务器返回的数据

HttpResponse response = client.execute(post);

// 6.使用响应对象, 获得状态码, 处理内容

int statusCode = response.getStatusLine().getStatusCode(); // 获得状态码

if(statusCode == 200) {

// 使用响应对象获得实体, 获得输入流

InputStream is = response.getEntity().getContent();

String text = getStringFromInputStream(is);

return text;

} else {

System.err.println("请求失败: " + statusCode);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if(client != null) {

client.getConnectionManager().shutdown(); // 关闭连接和释放资源

}

return null;

}

/**

* 使用get的方式登录

public static String loginOfGet(String userName, String password) {

HttpClient client = null;

try {

// 1.定义请求参数

String data = "username=" + userName + "&password=" + password;

// 2.定义一个get请求方法

HttpGet get = new HttpGet(uriLogin + "?" + data);

// 3.定义一个客户端

client = new DefaultHttpClient();

// 4.执行, 请求网络。

// response 服务器相应对象, 其中包含了状态信息和服务器返回的数据

HttpResponse response = client.execute(get);

// 5.获得响应码，处理数据

int statusCode = response.getStatusLine().getStatusCode();

if(statusCode == 200) {

InputStream is = response.getEntity().getContent();

String text = getStringFromInputStream(is);

return text;

} else {

System.err.println("请求失败: " + statusCode);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if(client != null) {

// 关闭连接, 和释放资源

client.getConnectionManager().shutdown();

}

return null;

}

/**

* 根据流返回一个字符串信息

private static String getStringFromInputStream(InputStream is) throws IOException {

ByteArrayOutputStream baos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = -1;

while((len = is.read(buffer)) != -1) {

baos.write(buffer, 0, len);

}

is.close();

String html = baos.toString(); // 把流中的数据转换成字符串, 采用的编码是: utf-8

baos.close();

return html;

}

2.主程


public class MainActivity extends ActionBarActivity {

	private EditText etUserName;
	private EditText etPassword;
	private String userName; // 用户名
	private String password; // 密码

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		etUserName = (EditText) findViewById(R.id.et_username);
		etPassword = (EditText) findViewById(R.id.et_password);

		userName = etUserName.getText().toString();
		password = etPassword.getText().toString();
	}

	/**
	 * 使用httpClient方式提交get请求
	 */
	public void doHttpClientOfGet(View v) {
		new Thread(new Runnable() {
			public void run() {
				// 请求网络
				final String state = Utils.loginOfGet(userName, password);
				// 执行任务在主线程中
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						// 就是在主线程中操作
						Toast.makeText(MainActivity.this, state, 0).show();
					}
				});
			}
		}).start();
	}

	/**
	 * 使用httpClient方式提交post请求
	 */
	public void doHttpClientOfPost(View v) {
		new Thread(new Runnable() {
			@Override
			public void run() {
				final String state = Utils.loginOfPost(userName, password);
				// 执行任务在主线程中
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						// 就是在主线程中操作
						Toast.makeText(MainActivity.this, state, 0).show();
					}
				});
			}
		}).start();
	}
}

public class MainActivity extends ActionBarActivity {

private EditText etUserName;

private EditText etPassword;

private String userName; // 用户名

private String password; // 密码

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

etUserName = (EditText) findViewById(R.id.et_username);

etPassword = (EditText) findViewById(R.id.et_password);

userName = etUserName.getText().toString();

password = etPassword.getText().toString();

}

/**

* 使用httpClient方式提交get请求

public void doHttpClientOfGet(View v) {

new Thread(new Runnable() {

public void run() {

// 请求网络

final String state = Utils.loginOfGet(userName, password);

// 执行任务在主线程中

runOnUiThread(new Runnable() {

@Override

public void run() {

// 就是在主线程中操作

Toast.makeText(MainActivity.this, state, 0).show();

}

});

}

}).start();

}

/**

* 使用httpClient方式提交post请求

public void doHttpClientOfPost(View v) {

new Thread(new Runnable() {

@Override

public void run() {

final String state = Utils.loginOfPost(userName, password);

// 执行任务在主线程中

runOnUiThread(new Runnable() {

@Override

public void run() {

// 就是在主线程中操作

Toast.makeText(MainActivity.this, state, 0).show();

}

});

}

}).start();

}

3.布局


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et_username"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="姓名vigiles@qq.com" />

    <EditText
        android:id="@+id/et_password"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="密码q09w486t0=cxz" />
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="doHttpClientOfGet"
        android:text="使用HttpClient方式提交Get请求" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="doHttpClientOfPost"
        android:text="使用HttpClient方式提交Post请求" />
</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context=".MainActivity" >

<EditText

android:id="@+id/et_username"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="姓名vigiles@qq.com" />

<EditText

android:id="@+id/et_password"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="密码q09w486t0=cxz" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="doHttpClientOfGet"

android:text="使用HttpClient方式提交Get请求" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="doHttpClientOfPost"

android:text="使用HttpClient方式提交Post请求" />

</LinearLayout>

4.权限


<uses-permission android:name="android.permission.INTERNET"/>

<uses-permission android:name="android.permission.INTERNET"/>

二。服务端
1.请求处理


public class WatchLogin extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=utf-8");
		
		String name = request.getParameter("username");
		String pswd = request.getParameter("password");
		
		// GET访问时，须转码
		name = new String(name.getBytes("iso8859-1"), "utf-8");
		pswd = new String(pswd.getBytes("iso8859-1"), "utf-8");
		
		System.out.println("用户:" +name + "\t密码:" + pswd);
		// 默认使用iso8859-1编码输出，如果码表没有输出的字符，则使用当前系统编码GBK。指定为utf-8
		response.getOutputStream().write(("GET反馈：你的名字：" + name + ", 密码：" + pswd).getBytes("utf-8"));
		
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=utf-8");
		
		String name = request.getParameter("username");
		String pswd = request.getParameter("password");
		
		System.out.println("用户:" +name + "\t密码:" + pswd);
		// 默认使用iso8859-1编码输出，如果码表没有输出的字符，则使用当前系统编码GBK。指定为utf-8
		response.getOutputStream().write(("POST反馈：你的名字：" + name + ", 密码：" + pswd).getBytes("utf-8"));
		
	}
}

public class WatchLogin extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

response.setContentType("text/html;charset=utf-8");

String name = request.getParameter("username");

String pswd = request.getParameter("password");

// GET访问时，须转码

name = new String(name.getBytes("iso8859-1"), "utf-8");

pswd = new String(pswd.getBytes("iso8859-1"), "utf-8");

System.out.println("用户:" +name + "\t密码:" + pswd);

// 默认使用iso8859-1编码输出，如果码表没有输出的字符，则使用当前系统编码GBK。指定为utf-8

response.getOutputStream().write(("GET反馈：你的名字：" + name + ", 密码：" + pswd).getBytes("utf-8"));

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

response.setContentType("text/html;charset=utf-8");

String name = request.getParameter("username");

String pswd = request.getParameter("password");

System.out.println("用户:" +name + "\t密码:" + pswd);

// 默认使用iso8859-1编码输出，如果码表没有输出的字符，则使用当前系统编码GBK。指定为utf-8

response.getOutputStream().write(("POST反馈：你的名字：" + name + ", 密码：" + pswd).getBytes("utf-8"));

}

2.请求路径


<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <servlet-name>WatchLogin</servlet-name>
    <servlet-class>com.cuiweiyou.servlets.WatchLogin</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>WatchLogin</servlet-name>
    <url-pattern>/servlets/WatchLogin</url-pattern>
  </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<servlet-name>WatchLogin</servlet-name>

<servlet-class>com.cuiweiyou.servlets.WatchLogin</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>WatchLogin</servlet-name>

<url-pattern>/servlets/WatchLogin</url-pattern>

</servlet-mapping>

</web-app>

声明

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