1.模仿登入页面显示（使用传统方式是面向过程的）
使用Apache公司提供的HttpClient API是面向对象的
（解决中文乱码的问题，主要是对中文的数据进行URL编码）
android手机默认的编码是UTF-8
2.手机截图Demo
3.服务器截图
代码如下：
服务器端的代码：
//测试 android设备登入
public class Login extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
//对数据进行编码，解决乱码问题
username = new String(username.getBytes("ISO-8859-1"),"UTF-8");
System.out.println("username--:"+username+"---password:"+password);
if(username.equals("admin") && password.equals("123")){
response.getOutputStream().write("登入成功".getBytes("UTF-8"));
}else{
response.getOutputStream().write("登入失败".getBytes("UTF-8"));
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// request.setCharacterEncoding("UTF-8");
doGet(request, response);
}
}
Android客户端
布局文件的部分：
//测试 android设备登入
public class Login extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
//对数据进行编码，解决乱码问题
username = new String(username.getBytes("ISO-8859-1"),"UTF-8");
System.out.println("username--:"+username+"---password:"+password);
if(username.equals("admin") && password.equals("123")){
response.getOutputStream().write("登入成功".getBytes("UTF-8"));
}else{
response.getOutputStream().write("登入失败".getBytes("UTF-8"));
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// request.setCharacterEncoding("UTF-8");
doGet(request, response);
}
}
Activity代码部分：
（注意：android4.0之后访问网络必须开子线程进行访问，并且涉及到权限，记得加上访问网络的权限
下面的代码中，我写入get和post两种方式的线程请求。。。。。。。。。。。。。慢慢体会
）
public class MainActivity extends AppCompatActivity {
private static final int SUCCESS = 0;
private static final int FAILE = 1;
private static final int NET_ERROR = 3;
private static final String TAG = "MainActivity";
EditText et_username;
EditText et_password;
TextView show_result;
String username;
String password;
final String path = "http://188.188.7.85/Android_Server/Login";
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
int what = msg.what;
switch (what) {
case SUCCESS:
String data = (String) msg.obj;
show_result.setText(data);
break;
case FAILE:
Toast.makeText(MainActivity.this, "连接服务器失败", Toast.LENGTH_SHORT).show();
break;
case NET_ERROR:
Toast.makeText(MainActivity.this, "网络出现异常", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_username = (EditText) findViewById(R.id.et_username);
et_password = (EditText) findViewById(R.id.et_password);
show_result = (TextView) findViewById(R.id.show_result);
username = et_username.getText().toString().trim();
password = et_password.getText().toString().trim();
}
public void login(View view) {
username = et_username.getText().toString().trim();
password = et_password.getText().toString().trim();
if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {
Toast.makeText(this, "用户名和密码不能为空", Toast.LENGTH_SHORT).show();
return;
}
//使用传统get方式的请求服务器
// new Thread_get().start();
//使用传统的post方式请求服务器
new Thread_post().start();
}
//传统的post方式请求服务器端
class Thread_post extends Thread {
@Override
public void run() {
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//1.设置请求方式
conn.setRequestMethod("POST");
conn.setConnectTimeout(5000); //设置连接的超时事件是5秒
//2.组合数据,一定要将数据进行URL编码
String commitData = "username="+URLEncoder.encode(username,"UTF-8")+"&password="+URLEncoder.encode(password,"UTF-8");
// 3. 指定content-type -实际上就是指定传输的数据类型
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
//4.指定content-length Content-Length: 数据的长度
conn.setRequestProperty("Content-Length", commitData.length() + "");
//5.打开输出流，告诉服务器，我要写数据了
conn.setDoOutput(true);
//6.开始写数据
OutputStream os = conn.getOutputStream();
os.write(commitData.getBytes());
// os.close();
int code = conn.getResponseCode(); //获取返回的成功代码
Log.i(TAG, "code:---" + code);
if (code == 200) {
//表示连接服务器成功返回信息
String data = ServerTools.getInfo(conn.getInputStream());
Log.i(TAG, "data:---" + data);
//使用消息处理机制，将数据传递给主线程
Message ms = new Message();
ms.what = SUCCESS;
ms.obj = data;
handler.sendMessage(ms);
} else {
//使用消息处理机制，将数据传递给主线程
Message ms = new Message();
ms.what = FAILE;
handler.sendMessage(ms);
}
} catch (Exception e) {
//使用消息处理机制，将数据传递给主线程
Message ms = new Message();
ms.what = NET_ERROR;
handler.sendMessage(ms);
e.printStackTrace();
}
}
}
//传统的get方式请求服务器端
class Thread_get extends Thread {
@Override
public void run() {
try {
String getPath = path +
"?username=" + URLEncoder.encode(username, "UTF-8") +
"&password=" + URLEncoder.encode(password, "UTF-8");
URL url = new URL(getPath);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000); //设置连接的超时事件是5秒
int code = conn.getResponseCode(); //获取返回的成功代码
Log.i(TAG, "code:---" + code);
;
if (code == 200) {
//表示连接服务器成功返回信息
String data = ServerTools.getInfo(conn.getInputStream());
Log.i(TAG, "data:---" + data);
//使用消息处理机制，将数据传递给主线程
Message ms = new Message();
ms.what = SUCCESS;
ms.obj = data;
handler.sendMessage(ms);
} else {
//使用消息处理机制，将数据传递给主线程
Message ms = new Message();
ms.what = FAILE;
handler.sendMessage(ms);
}
} catch (Exception e) {
//使用消息处理机制，将数据传递给主线程
Message ms = new Message();
ms.what = NET_ERROR;
handler.sendMessage(ms);
e.printStackTrace();
}
}
}
}
工具类:
public class ServerTools {
//从服务端获取流数据进行转化成文本文件
public static String getInfo(InputStream in) {
//将数据流写在内存中
ByteArrayOutputStream raf = new ByteArrayOutputStream();
String data = null;
try{
byte[] bt = new byte[1024];
int len =0 ;
while((len = in.read(bt)) != -1){
raf.write(bt,0,len);
}
data = raf.toString();
}catch (Exception e){
e.printStackTrace();
}
return data;
}
}
Android的源代码已经放在github中：
传统方式Demo地址：https://github.com/momxmo/HTTP_get_post
Apache提供的HttpClient API面向对象的方式Demo：https://github.com/momxmo/HttpClient_get_post
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时间： 2024-09-29 15:30:17