以自己的电脑作为服务器，Android端通过JSON来传递数据到后台

梦里梦外; 2022-07-12 05:26 159阅读 0赞

# 不会写后台的Android程序猿不是好程序猿！！！！ #

# **JAVA后台** #

一、新建JavaWeb项目

File->New->Other->Dynamic Web Project

二、导入 fastjson  jar包，下载位置：[http://download.csdn.net/detail/lrici/9753344][http_download.csdn.net_detail_lrici_9753344]

三、1、新建User类

package com.cc.json;
    
    import java.util.Date;
    
    import org.omg.CosNaming.NamingContextExtPackage.StringNameHelper;
    
    public class User {
    
    	private String name;
    	private Date birthday;
    	private String password;
    	private Integer age;
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public Date getBirthday() {
    		return birthday;
    	}
    	public void setBirthday(Date birthday) {
    		this.birthday = birthday;
    	}
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	public Integer getAge() {
    		return age;
    	}
    	public void setAge(Integer age) {
    		this.age = age;
    	}
    	
    }

2、新建ServletJson类

package com.cc.json;
    
    import java.io.IOException;  
    import java.io.OutputStream;  
    import java.util.Date;  
      
    import javax.servlet.ServletException;  
    import javax.servlet.http.HttpServlet;  
    import javax.servlet.http.HttpServletRequest;  
    import javax.servlet.http.HttpServletResponse;
    
    import com.alibaba.fastjson.JSON;
    
    public class ServletJson extends HttpServlet{
    
    	  private User buildUserDO(){  
    	        User user = new User();  
    	        user.setName("王二麻子");  
    	        user.setPassword("sdgsgd");  
    	        user.setAge(11);  
    	        user.setBirthday(new Date());  
    	          
    	        return user;  
    	    }  
    	    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
    	        response.setContentType("application/json; charset=utf-8");  
    	        response.setCharacterEncoding("UTF-8");  
    	  
    	        String userJson = JSON.toJSONString(buildUserDO());  
    	        OutputStream out = response.getOutputStream();  
    	        out.write(userJson.getBytes("UTF-8"));  
    	        out.flush();  
    	    }  
    	  
    	    
    	    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
    	    }  
    }

四、在web.xml中添加映射

<servlet-name>HelloJson</servlet-name>
    <servlet-class>com.cc.json.ServletJson</servlet-class>
      </servlet>
      <servlet-mapping>
      <servlet-name>HelloJson</servlet-name>
      <url-pattern>/HelloJson</url-pattern>
      </servlet-mapping>

五、Run As->Run on Server

在浏览器输入http://localhost:8080/HelloJson/ServletJson

执行结果![Center][]

源码下载[http://download.csdn.net/detail/lrici/9753347][http_download.csdn.net_detail_lrici_9753347]

Android端

一、在AndroidStudio中新建项目

二、编辑activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout 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"
        android:fitsSystemWindows="true"
        tools:context="cool.example.administrator.connectnetwork.MainActivity">
    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:text="读取数据"
        />
    
    
    </android.support.design.widget.CoordinatorLayout>

三、编辑MainActivity.java文件

package cool.example.administrator.connectnetwork;
    
    import android.os.AsyncTask;
    import android.os.Bundle;
    import android.support.design.widget.FloatingActionButton;
    import android.support.design.widget.Snackbar;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.view.View;
    import android.view.Menu;
    import android.view.MenuItem;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.net.MalformedURLException;
    import java.net.URL;
    import java.net.URLConnection;
    import java.util.concurrent.SynchronousQueue;
    
    public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            findViewById(R.id.button1).setOnClickListener(new View.OnClickListener(
    
            ) {
                @Override
                public void onClick(View v) {
                    new AsyncTask<String, Void, Void>() {
                        @Override
                        protected Void doInBackground(String... params) {
                            try {
                                URL url=new URL(params[0]);
                               URLConnection urlConnection= url.openConnection();
                                //inputstrewam来接收返回值
                               InputStream inputStream= urlConnection.getInputStream();
                                //把inputStream封装成eInputStreamReader,是一个从字节到字符的转换
                                InputStreamReader inputStreamReader=new InputStreamReader(inputStream,"UTF-8");
                                //创建一个bufferReader,通过BufferReader直接读取一行字符串
                                BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
                                String line;//用于临时记录读取到的一行字符串
                                while((line= bufferedReader.readLine())!=null){
                                    System.out.println(line);
                                }
                                bufferedReader.close();
                                inputStreamReader.close();
                                inputStream.close();
    
    
                            } catch (MalformedURLException e) {
                                e.printStackTrace();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                            return null;
                        }
                    }.execute("http://10.11.177.245:8080/HelloJson/ServletJson");
                }
            });
    
    
        }
    
    
    }

注意：**10.11.177.245是本机的IP地址！！！即Java后台运行时在浏览器中输入的localhost**

四、在AndroidManifest.xml中添加网络连接的权限

<uses-permission android:name="android.permission.INTERNET"/>

五、运行安装程序,点击读取数据

运行结果

![Center 1][]

注意：测试的时候需要使用Android虚拟机来安装Apk文件，使用真机测试不通过，使用真机测试方法[http://blog.csdn.net/lrici/article/details/55098876][http_blog.csdn.net_lrici_article_details_55098876]

源码地址：[http://download.csdn.net/detail/lrici/9754119][http_download.csdn.net_detail_lrici_9754119]

[http_download.csdn.net_detail_lrici_9753344]: http://download.csdn.net/detail/lrici/9753344
[Center]: /images/20220711/affae0bf5f1944c4aa50e533418aa50a.png
[http_download.csdn.net_detail_lrici_9753347]: http://download.csdn.net/detail/lrici/9753347
[Center 1]: /images/20220711/398b038765d643e18de0d95d16c0c31a.png
[http_blog.csdn.net_lrici_article_details_55098876]: http://blog.csdn.net/lrici/article/details/55098876
[http_download.csdn.net_detail_lrici_9754119]: http://download.csdn.net/detail/lrici/9754119