Android之使用HttpPost提交数据到服务器（Android手机客户端和后台服务器交互）
16lz
2021-12-04
这是一个小型的数据交互案例，即Android手机客户端和后台服务器交互（数据库mysql）
服务器端
首先服务器端数据库（用户名root密码123456），db_student.sql数据库表userinfo（用户名admin，密码123）
访问数据库的工具类DBManager.java
package com.jdbc.db;import java.lang.reflect.Field;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.ResultSetMetaData;import java.sql.SQLException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * 负责访问数据库的工具类 * @author liuya * */public class DBManager {//数据库的用户名和密码private final String USERNAME="root";private final String PSWD="123456";//数据库驱动private final String DRIVER="com.mysql.jdbc.Driver";private final String URL="jdbc:mysql://localhost:3306/db_student";private Connection connection;//连接数据库private PreparedStatement pstmt;//采用预编译的sql语句执行添加、删除、修改和查询的功能，效率高private ResultSet rs;//查询返回的结果集合private static DBManager instance;private DBManager() {// TODO Auto-generated constructor stubtry {Class.forName(DRIVER);} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void getConnection(){try {connection=DriverManager.getConnection(URL, USERNAME, PSWD);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * 使用单例模式获得数据库的访问对象：保证数据的安全性 * @return */public static DBManager getInstance(){if(instance==null){instance=new DBManager();}return instance;}/** * 释放连接 */public void releaseConn(){if(rs!=null){try {rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(pstmt!=null){try {pstmt.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(connection!=null){try {connection.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}/** * 功能：对数据库表的增加删除和修改功能 * @param sql * @param params * @return * @throws SQLException */public boolean updateBySql(String sql,List一、开发服务器端
①创建登录LoginService.java(接口interface)
package com.android.login;import java.util.List;//判断用户是否存在public interface LoginService {public boolean isUserExitLogin(List
package com.android.login;import java.sql.SQLException;import java.util.List;import java.util.Map;import com.jdbc.db.DBManager;public class LoginDao implements LoginService {private DBManager manager;public LoginDao() {// TODO Auto-generated constructor stubmanager=DBManager.getInstance();}@Overridepublic boolean isUserExitLogin(List
package com.android.login;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONSerializer;/** * Servlet implementation class LoginAction */@WebServlet("/LoginAction")public class LoginAction extends HttpServlet {private static final long serialVersionUID = 1L; private LoginService service; @Override public void init() throws ServletException { // TODO Auto-generated method stub super.init(); service=new LoginDao(); } /** * @see HttpServlet#HttpServlet() */ public LoginAction() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubthis.doPost(request, response);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubresponse.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");PrintWriter writer = response.getWriter();String username=request.getParameter("username");String password=request.getParameter("password");List
package com.android.login;public class ResultMessage {private int resultCode;// 结果码private String resultMessage;// 结果信息public int getResultCode() {return resultCode;}public void setResultCode(int resultCode) {this.resultCode = resultCode;}public String getResultMessage() {return resultMessage;}public void setResultMessage(String resultMessage) {this.resultMessage = resultMessage;}public ResultMessage() {// TODO Auto-generated constructor stub}public ResultMessage(int resultCode, String resultMessage) {super();this.resultCode = resultCode;this.resultMessage = resultMessage;}}①在activity_main.xml设置界面如下，在清单文件中加网络授权：Permissions->Add->Uses Permission->ok->在右边的name中查找INTERNET
②在MainActivity.java中实例化控件
③创建工具类HttpUtils.java
package com.example.android_httppost_login.http;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;public class HttpUtils {public HttpUtils() {// TODO Auto-generated constructor stub}/** * * @param path * @param params 模拟http表单数据 * @param encode * @return */public static String sendPostMethod(String path,Map params,String encoding){HttpClient httpClient=new DefaultHttpClient();HttpPost httpPost=new HttpPost(path);String result="";List parameters=new ArrayList();try {if(params!=null&&!params.isEmpty()){for(Map.Entry entry:params.entrySet()){String name=entry.getKey();//String value=URLEncoder.encode( entry.getValue().toString(),encoding);//如果出现乱码问题，则修改String value=entry.getValue().toString();BasicNameValuePair valuePair=new BasicNameValuePair(name, value);parameters.add(valuePair);}}UrlEncodedFormEntity encodedFormEntity=new UrlEncodedFormEntity(parameters,encoding);//纯文本表单，不包含文件httpPost.setEntity(encodedFormEntity);HttpResponse httpResponse=httpClient.execute(httpPost);if(httpResponse.getStatusLine().getStatusCode()==200){result=EntityUtils.toString(httpResponse.getEntity(), encoding);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return result;}}
package com.example.android_httppost_login.domain;public class ResultMessage {private int resultCode;// 结果码private String resultMessage;// 结果信息public int getResultCode() {return resultCode;}public void setResultCode(int resultCode) {this.resultCode = resultCode;}public String getResultMessage() {return resultMessage;}public void setResultMessage(String resultMessage) {this.resultMessage = resultMessage;}public ResultMessage() {// TODO Auto-generated constructor stub}public ResultMessage(int resultCode, String resultMessage) {super();this.resultCode = resultCode;this.resultMessage = resultMessage;}}
package com.example.android_httppost_login.json;import org.json.JSONObject;import com.example.android_httppost_login.domain.ResultMessage;public class JsonTools {public JsonTools() {// TODO Auto-generated constructor stub}/** * {"result":{"resultCode":1,"resultMessage":"登录成功"}} * @param jsonString * @return */public static ResultMessage getResultMessage(String jsonString){ResultMessage message=null;try {JSONObject sourceObject=new JSONObject(jsonString);JSONObject jsonObject=sourceObject.getJSONObject("result");message=new ResultMessage();message.setResultCode(jsonObject.getInt("resultCode"));message.setResultMessage(jsonObject.getString("resultMessage"));} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return message;}}⑥在MainActivity.java处理（用异步任务处理post请求）
package com.example.android_httppost_login;import java.util.HashMap;import java.util.Map;import com.example.android_httppost_login.domain.ResultMessage;import com.example.android_httppost_login.http.HttpUtils;import com.example.android_httppost_login.json.JsonTools;import android.support.v7.app.ActionBarActivity;import android.app.ProgressDialog;import android.content.Intent;import android.os.AsyncTask;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends ActionBarActivity {private Button btn;private EditText usernameEdt;private EditText passwordEdt;private ProgressDialog dialog;private final String LOGIN_PATH="http://192.168.1.100:8080/Httppost_Web/LoginAction";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn=(Button) this.findViewById(R.id.button1);usernameEdt=(EditText) this.findViewById(R.id.editText1);passwordEdt=(EditText) this.findViewById(R.id.editText2);dialog=new ProgressDialog(this);dialog.setTitle("提示");dialog.setMessage("正在登录,请稍候...");btn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString name_value=usernameEdt.getText().toString().trim();String pswd_value=passwordEdt.getText().toString().trim();Map params=new HashMap();params.put("url", LOGIN_PATH);params.put("username", name_value);params.put("password", pswd_value);try {String result=new LoginAsyncTask().execute(params).get();ResultMessage message=JsonTools.getResultMessage(result);if(message.getResultCode()==1){Toast.makeText(MainActivity.this, message.getResultMessage(), 1).show();Intent intent=new Intent(MainActivity.this,NextActivity.class);startActivity(intent);}System.out.println("--->>"+result);} catch (Exception e) {// TODO: handle exception}}});}class LoginAsyncTask extends AsyncTask, Void, String>{@Overrideprotected void onPreExecute() {// TODO Auto-generated method stubsuper.onPreExecute();dialog.show();}@Overrideprotected String doInBackground(Map... params) {// TODO Auto-generated method stubMap map=params[0];//表单数据Map params2=new HashMap();params2.put("username", map.get("username"));params2.put("password", map.get("password"));String result=HttpUtils.sendPostMethod(map.get("url"), params2, "utf-8");return result;}@Overrideprotected void onPostExecute(String result) {// TODO Auto-generated method stubsuper.onPostExecute(result);dialog.dismiss();}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}} 更多相关文章
- Android：数据存储之SQLite
- 在Android中查看和管理sqlite数据库
- 在Android中查看和管理sqlite数据库
- 【Android】Android(安卓)联系人数据库浅析之通话记录
- android 数据库同步
- ch020 Android(安卓)SQLite3(第一部分)
- android 操作sqlite数据库
- android 操作sqlite数据库
- android 监听联系人数据库