Android+Struts2实现简单的前后台交互--Android网络编程
Posted Thanlon
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1、下面测试截图,基本过程就是:点击按钮向服务器端发送请求,后台收到请求后给出返回的数据,前台只需要显示服务端数据就可以了。例子很简单能但引发很多思考,博主学了杂七杂八的,这又在来想杂学android了?……其实是想多了解一下其他东西,毕竟博主还在上大学呀!多学点没什么不好……
2、客户端(Android)关键代码
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 @Override 24 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对象 31 OkHttpClient okHttpClient = new OkHttpClient(); 32 //构造Request 33 Request request = new Request.Builder().get() 34 .url(mBaseUrl+"login?username=Thanlon&password=123").build(); 35 // 将Request封装成Call 36 // 执行Call 37 okHttpClient.newCall(request).enqueue(new Callback() { 38 @Override 39 public void onFailure(Call call, IOException e) { 40 e.printStackTrace(); 41 } 42 43 @Override 44 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 @Override 55 public void run() { 56 tv.setText(resultInfo); 57 } 58 }); 59 } 60 }
activity_main.xml:(布局也发了,做个参考)
<?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="向服务器端发送请求(这里以Get请求作为示例)" 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、服务器端主要代码
UserLoginAction.java:(Servlet自然也可以,这里借助了strut2框架)
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"); //防止服务端发送到到客户端的数据出现中文乱码 22 PrintWriter pw = response.getWriter(); 23 pw.write("下面是服务器端返回的数据:\\n\\n"); 24 pw.write("您提交的用户名是:"+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:个人网站www.nxl123.cn(后台采用Python Flask框架搭建,2019年1月1日将升级完成并正式启用。哎,本人还是学生狗呢!网站做的不好多多提点意见和建议吧,别骂我就好!嘿嘿……以后SEO什么的还得多向大家学习……)
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