標籤:ica java 服務 img style 啟用 appcompat oncreate 簡單的
1、下面測試,基本過程就是:點擊按鈕向伺服器端發送請求,後台收到請求後給出返回的資料,前台只需要顯示服務端資料就可以了。例子很簡單能但引發很多思考,博主學了雜七雜八的,這又在來想雜學Android了?……其實是想多瞭解一下其他東西,畢竟博主還在上大學呀!多學點沒什麼不好……
2、用戶端(Android)關鍵代碼MainActivity.java:
1 package thonlon.example.cn.sendgetdemo; 2 3 import android.inputmethodservice.KeyboardView; 4 import android.support.v7.app.AppCompatActivity; 5 import android.os.Bundle; 6 import android.view.View; 7 import android.widget.Button; 8 import android.widget.ScrollView; 9 import android.widget.TextView;10 11 import java.io.IOException;12 13 import okhttp3.Call;14 import okhttp3.Callback;15 import okhttp3.OkHttpClient;16 import okhttp3.Request;17 import okhttp3.Response;18 19 public class MainActivity extends AppCompatActivity {20 21 private TextView tv;22 private String mBaseUrl = "http://192.168.43.218:8080/OkHttpGetServer/";23 @Override24 protected void onCreate(Bundle savedInstanceState) {25 super.onCreate(savedInstanceState);26 setContentView(R.layout.activity_main);27 }28 29 public void doGet(View view) {30 //拿到okHttpClient對象31 OkHttpClient okHttpClient = new OkHttpClient();32 //構造Request33 Request request = new Request.Builder().get()34 .url(mBaseUrl+"login?username=Thanlon&password=123").build();35 // 將Request封裝成Call36 // 執行Call37 okHttpClient.newCall(request).enqueue(new Callback() {38 @Override39 public void onFailure(Call call, IOException e) {40 e.printStackTrace();41 }42 43 @Override44 public void onResponse(Call call, Response response) throws IOException {45 String res = response.body().string();46 showResultInfo(res);47 }48 });49 }50 51 private void showResultInfo(final String resultInfo) {52 tv = (TextView) findViewById(R.id.tv);53 runOnUiThread(new Runnable() {54 @Override55 public void run() {56 tv.setText(resultInfo);57 }58 });59 }60 }
activity_main.xml:(布局也發了,做個參考)
<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="thonlon.example.cn.sendgetdemo.MainActivity"> <Button android:id="@+id/btn_send" android:layout_width="0dp" android:layout_height="wrap_content" android:onClick="doGet" android:text="向伺服器端發送請求(這裡以Get請求作為樣本)" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.0" /> <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintVertical_bias="0.097" /></android.support.constraint.ConstraintLayout>
3、伺服器端主要代碼UserLoginAction.java:(Servlet自然也可以,這裡藉助了strut2架構)
1 package com.okhttp; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 6 import javax.security.auth.message.callback.PrivateKeyCallback.Request; 7 import javax.servlet.http.HttpServletResponse; 8 9 import org.apache.struts2.ServletActionContext;10 11 import com.opensymphony.xwork2.ActionSupport;12 13 public class UserLoginAction extends ActionSupport {14 15 private String username;16 private String password;17 18 public String login() throws IOException {19 // System.out.println(username+ "," + password);20 HttpServletResponse response = ServletActionContext.getResponse();21 response.setCharacterEncoding("utf-8"); //防止服務端發送到到用戶端的資料出現中文亂碼22 PrintWriter pw = response.getWriter();23 pw.write("下面是伺服器端返回的資料:\n\n");24 pw.write("您提交的使用者名稱是:"+username);25 pw.flush();26 return null;27 }28 29 public String getUsername() {30 return username;31 }32 33 public void setUsername(String username) {34 this.username = username;35 }36 37 public String getPassword() {38 return password;39 }40 41 public void setPassword(String password) {42 this.password = password;43 }44 }
struts.xml:
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE struts PUBLIC 3 "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 4 "http://struts.apache.org/dtds/struts-2.0.dtd"> 5 <struts> 6 <package name="default" namespace="/" extends="struts-default"> 7 <action name="login" class="com.okhttp.UserLoginAction" method="login"> 8 </action> 9 </package>10 </struts>
附:個人網站www.nxl123.cn(後台採用Python Flask架構搭建,2019年1月1日將升級完成並正式啟用。哎,本人還是學生狗呢!網站做的不好多多提點意見和建議吧,別罵我就好!嘿嘿……以後SEO什麼的還得多向大家學習……)
Android+Struts2實現簡單的前後台互動--Android網路編程