Android客户端连接服务器

//Android端代码

public class LoginActivity extends Activity
{
EditText et_username,et_password;
TextView tv_errMsg;
Button btn_login;
String strUrl = "http://192.168.1.102:8080/Login/login_login2.action";
public static int REQUEST_SUCCESS_CODE = 200;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.setContentView(R.layout.proj2_login);
et_username = (EditText)findViewById(R.id.et_username);
et_password = (EditText)findViewById(R.id.et_password);
tv_errMsg = (TextView)findViewById(R.id.tv_errMsg);
btn_login = (Button)findViewById(R.id.btn_login);
btn_login.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
String result;
/* 发送部分 */
try {
HttpClient httpClient = new DefaultHttpClient();
String address = strUrl;
HttpPost httpPost = new HttpPost(address);
List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("username", et_username.getText().toString()));
params.add(new BasicNameValuePair("password", et_password.getText().toString()));
httpPost.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //将参数填入POST Entity中

HttpResponse httpResponse = httpClient.execute(httpPost);

/* 接收 */
if (httpResponse.getStatusLine().getStatusCode() == 200) {
result = EntityUtils.toString(httpResponse.getEntity());
/* json文本解析 */
JSONTokener jsonParser = new JSONTokener(result);

JSONObject jsonResult = (JSONObject) jsonParser.nextValue();
String status = jsonResult.getString("loginStatus");
String outMessage = jsonResult.getString("outMessage");
if(status.equals("true")){
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
intent.putExtra("username", outMessage);
startActivityForResult(intent, REQUEST_SUCCESS_CODE);
} else {
tv_errMsg.setVisibility(View.VISIBLE);
tv_errMsg.setText(outMessage);
}
} else {
tv_errMsg.setVisibility(View.VISIBLE);
tv_errMsg.setText("连接异常，CODE:" + httpResponse.getStatusLine().getStatusCode());
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}

服务器端代码：采用SSH框架
public class LoginAction extends ActionSupport {

HttpServletRequest request;
HttpServletResponse response;
LoginService loginService;

public LoginService getLoginService() {
return loginService;
}

public void setLoginService(LoginService loginService) {
this.loginService = loginService;
}

public String execute() throws Exception
{
request = ServletActionContext.getRequest();
request.setCharacterEncoding("utf-8"); //避免乱码

String name = request.getParameter("username");
String password = request.getParameter("password");
int result = loginService.validate(name, password);//验证用户名密码是否正确

JsonObject jsonObj = new JsonObject(); //须引入gson jar包
String loginStatus = "";
String outMessage = "";
if(result>0){
loginStatus = "true";
outMessage = "登录失败！";
}
else{
loginStatus = "false";
outMessage = "用户名或密码错误！";
}
jsonObj.addProperty("loginStatus", loginStatus);
jsonObj.addProperty("outMessage", outMessage);

response = ServletActionContext.getResponse();

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

PrintWriter out = response.getWriter();
out.write(jsonObj.toString());
//out.println(jsonObj.toString()); //也ok
return null;
}
}

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