首先是客戶端

通過輸入使用者名稱+密碼實現登入

點選登入後向伺服器傳送http請求 伺服器收到請求後驗證使用者名稱密碼是否與mysql資料庫上的相應欄位是否一致

然後返回json資料 客戶端獲取響應的結果 然後提醒是否登入成功

MainActivity程式碼:

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
 //伺服器應該為本地ip
 private static  String url="http://172.20.210.68:8080/CheLianWangServer/login.action?";
 private final String url_constant="http://172.20.210.68:8080/CheLianWangServer/login.action?";
 private EditText txUserName;
 private EditText txPassword;
 private Button btnLogin;
    @Override
    public void onCreate(Bundle savedInstanceState) {
    ///在Android2.2以後必須新增以下程式碼
//本應用採用的Android4.0
//設定執行緒的策略
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()   
         .detectDiskReads()   
         .detectDiskWrites()   
         .detectNetwork()   // or .detectAll() for all detectable problems   
         .penaltyLog()   
         .build());   
//設定虛擬機器的策略
 StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()   
        .detectLeakedSqlLiteObjects()   
        //.detectLeakedClosableObjects()   
        .penaltyLog()   
        .penaltyDeath()   
        .build());
        super.onCreate(savedInstanceState);
        //設定頁面佈局
        setContentView(R.layout.main);
        //設定初始化檢視
        initView();
        //設定事件監聽器方法
        setListener();
    }
    
    /**
     * 建立初始化檢視的方法
     */
private void initView() {
btnLogin=(Button)findViewById(R.id.btnLogin);
txUserName=(EditText)findViewById(R.id.UserName);
txPassword=(EditText)findViewById(R.id.textPasswd);
}
/**
* 設定事件的監聽器的方法
*/
private void setListener() {
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String userName=txUserName.getText().toString();
Log.v("userName = ", userName);
String password=txPassword.getText().toString();
Log.v("passwd = ",password);
loginRemoteService(userName,password);
}
});
}


/**
     * 獲取Struts2 Http 登入的請求資訊
     * @param  userName
     * @param  password
     */
    public void loginRemoteService(String userName,String password){
        String result=null;
    try {
    
   //建立一個HttpClient物件
   HttpClient httpclient = new DefaultHttpClient();
   //遠端登入URL
   //下面這句是原有的
   //processURL=processURL+"userName="+userName+"&password="+password;
   url= url_constant+"username="+userName+"&password="+password;
   Log.d("遠端URL", url);
       //建立HttpGet物件
   HttpGet request=new HttpGet(url);
   //請求資訊型別MIME每種響應型別的輸出（普通文字、html 和 XML，json）。允許的響應型別應當匹配資源類中生成的 MIME 型別
   //資源類生成的 MIME 型別應當匹配一種可接受的 MIME 型別。如果生成的 MIME 型別和可接受的 MIME 型別不 匹配，那麼將
   //生成 com.sun.jersey.api.client.UniformInterfaceException。例如，將可接受的 MIME 型別設定為 text/xml，而將
   //生成的 MIME 型別設定為 application/xml。將生成 UniformInterfaceException。
   request.addHeader("Accept","text/json");
       //獲取響應的結果
HttpResponse response =httpclient.execute(request);
//獲取HttpEntity
HttpEntity entity=response.getEntity();
//獲取響應的結果資訊
String json =EntityUtils.toString(entity,"UTF-8");
//JSON的解析過程
if(json!=null){
JSONObject jsonObject=new JSONObject(json);
result=jsonObject.get("login").toString();
}
  if(result==null){  
  json="登入失敗請重新登入";
  }
//建立提示框提醒是否登入成功
AlertDialog.Builder builder=new Builder(MainActivity.this);
builder.setTitle("提示")
.setMessage(result)
.setPositiveButton("確定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).create().show();
 
    } catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
    }
    
}

AndroidManifest.xml中要配置android.permission.INTERNET許可權

伺服器端

使用springmvc的註解方式解析客戶端傳來的URL 拿到使用者名稱和密碼

如果使用者名稱和密碼與mysql資料庫上的相應欄位一致 則返回json資料給客戶端提醒登陸成功

模型層:

private String username;
private String password;

public User(String username, String password) {
super();


this.username = username;
this.password = password;
//this.sex = sex;
//this.age = age;
//this.photo = photo;
}
public User() {
super();
// TODO Auto-generated constructor stub
}


public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

db層:

public class GetConn {
public Connection getConnection(){
Connection connection = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/usermsg","root",null);
} catch (Exception e) {
// TODO: handle exception
}

return connection;
}

public void closeConn(Connection connection){

try {
connection.close();
} catch (Exception e) {
// TODO: handle exception
}


}

dbimp:

public boolean Login(String username,String password){
boolean b = false;
GetConn getConn = new GetConn();
ResultSet rs = null;
Connection conn = getConn.getConnection();
try {
PreparedStatement ps = conn.prepareStatement("select * from usermsg where username=? and password=?");
ps.setString(1, username);
ps.setString(2, password);

rs = ps.executeQuery();
if(rs.next()){

b = true;
}else{

b = false;
}

} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return b;
}

Controller:

@Controller  
public class UserController {  

Map<String, String> json;
byte[] jsonBytes;
@RequestMapping("/login.action")  // 請求url地址對映，類似Struts的action-mapping
public Object Login(HttpServletRequest request, HttpServletResponse response,ModelMap model){
try {
String username = request.getParameter("username");
String password = request.getParameter("password");

System.out.println("<<<<<<<<<<<R O T K~!>>>>>>>>>>>");
System.out.println("username = "+username+" password = "+password);

json = new HashMap<String, String>();

UserDaoImp userDaoImp = new UserDaoImp();

boolean b = userDaoImp.Login(username, password);

if(b){
json.put("login", "登陸成功，歡迎光臨!"+"尊敬的"+username+"閣下!");

}else{
json.put("login", "使用者名稱或密碼錯誤!");
}

jsonBytes = json.toString().getBytes("utf-8");
response.setContentLength(jsonBytes.length);

response.getOutputStream().write(jsonBytes);

response.getOutputStream().flush();
response.getOutputStream().close();
} catch (Exception e) {
e.printStackTrace();

}

return null;


}

    
}