附件有完整代码
登录界面：
登录的Activity:
package com.example.knowledgedemo;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.example.entity.loginPerson;
import com.example.utils.HttpUtil;
import com.example.utils.ToastUtil;
import com.google.gson.Gson;
/**
* 知识点：handler的使用、服务端客户端交互、Json、Gson、
* @author somebody
*
*/
public class LoginDemo extends Activity {
private EditText loginname, password;
private Button login;
private ProgressDialog progressdialog;
private String name, pwd;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
loginname = (EditText) findViewById(R.id.loginname);
password = (EditText) findViewById(R.id.password);
login = (Button) findViewById(R.id.login);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
login();//点击登录按钮
}
});
}
private void login() {
showProgressDialog();//显示进度框
new Thread() {
public void run() {
requestServer();//请求服务器
}
}.start();
}
private void showProgressDialog() {
if (progressdialog == null) {
progressdialog = new ProgressDialog(this);
}
if (progressdialog.isShowing()) {
progressdialog.dismiss();
}
progressdialog.setTitle("提示");
progressdialog.setMessage("正在登陆..");
progressdialog.show();
}
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
progressdialog.dismiss();
switch (msg.what) {
case 0:
ToastUtil.longToast(getApplicationContext(),
R.string.network_ok);//Toast 提示信息、登录成功
break;
case 1:
ToastUtil.longToast(getApplicationContext(),
R.string.network_not_ok);//登录失败
break;
case 2:
ToastUtil.longToast(getApplicationContext(),
R.string.network_not_ok);//TimeOut 网络连接失败
break;
default:
break;
}
}
};
private void requestServer(){
name = loginname.getText().toString();
pwd = password.getText().toString();//获取用户名密码
loginPerson person = new loginPerson();
person.setLoginName(name);
person.setPassWord(pwd);
Gson g = new Gson();
/*
* Gson将person对象转换为Json格式的字符串
* 此时obj = {"loginName":"1","passWord":"1"}
* */
String obj = g.toJson(person);
String result = HttpUtil.httpPostCodeParams("login",obj);//请求服务端、获取返回值
JSONObject resultObject;
if(result.startsWith("TimeOut")||result.length()==0){
handler.sendEmptyMessage(2);//请求服务端超时
}else{
try {
//如果不超时、返回的数据格式 {"result":"0"}
resultObject = new JSONObject(result);
result = resultObject.getString("result");
} catch (JSONException e) {
e.printStackTrace();
}
if(result.equals("0")){
handler.sendEmptyMessage(0);//登录成功
}else if(result.equals("1")){
handler.sendEmptyMessage(1);//登录失败
}
}
}
}
存放用户名密码的LoginPerson对象：
package com.example.entity;
public class LoginPerson {
private String loginName;
private String passWord;
public String getLoginName() {
return loginName;
}
public void setLoginName(String loginName) {
this.loginName = loginName;
}
public String getPassWord() {
return passWord;
}
public void setPassWord(String passWord) {
this.passWord = passWord;
}
}
请求服务端的方法：
package com.example.utils;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
public class HttpUtil {
/**
* 传递命令和参数
*
* @param postCode
* @param obj
* @return
*/
public static String httpPostCodeParams(String postCode, String obj) {
StringBuilder sbResponse = new StringBuilder();
URL url;
try {
//请求的url = http://10.33.1.204:8888/KnowledgeManagementServer/Servlet/ 加 postCode
//服务端ip、端口、服务端项目名、服务端使用servlet+命令的方式响应请求
url = new URL(getUrl(postCode));
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setReadTimeout(Constants.connectTimeout);
conn.setConnectTimeout(Constants.connectTimeout);
conn.setDoOutput(true);
conn.setDoInput(true);
DataOutputStream outStream = new DataOutputStream(
conn.getOutputStream());
outStream.writeUTF(obj.toString());
outStream.flush();
outStream.close();
int cah = conn.getResponseCode();
if (cah != 200) {
return "TimeOut";
}
BufferedReader reader = new BufferedReader(new InputStreamReader(
conn.getInputStream(), "utf-8"));
String lines;
while ((lines = reader.readLine()) != null) {
sbResponse.append(lines);
}
conn.disconnect();
} catch (SocketTimeoutException e) {
return "TimeOut";
} catch (IOException e) {
e.printStackTrace();
}
return sbResponse.toString();
}
private static String getUrl(String postCode) {
return Constants.server + postCode;
}
}
Servlet相应类:
package com.ck.servlet;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.ck.entity.LoginPerson;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
public class LoginServlet extends HttpServlet{
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
PrintWriter out = resp.getWriter();
DataInputStream dis = new DataInputStream(req.getInputStream());
String param = dis.readUTF();
Gson g = new Gson();
LoginPerson person = g.fromJson(param, LoginPerson.class);
JsonObject jsonObject = new JsonObject();
if(person.getLoginName().equals("1")&&person.getPassWord().equals("1")){
jsonObject.addProperty("result", "0");
}else{
jsonObject.addProperty("result", "1");
}
//{"result":"0"}
out.print(jsonObject.toString());
out.flush();
out.close();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(req, resp);
}
}