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笔记自用 来源：阳光沙滩 拉大锯

关于http响应码

http请求格式

android权限配置

网络权限：

关于Android 版本，网络请求的问题： 权限配置了，还是无法发起请求。这个其实可以去看log，log会告诉你为什么不给你请求。

也有同学说在版本27的时候可以，到了29上就不可以了。 遇到这些问题怎么办呢？可以去看官方文档

android28以前的版本，比如说27可以使用明文(http)访问，27以后需要网络安全配置，28(包括28)以上，则需要配置 否则就会报下面的错：

   
       
            
     
      sunofbeaches.com
             
                 
      
       www.sunofbeach.net
                  
      
       imgs.sunofbeaches.com
              
         
    
   

简单读取：

public void loadJson(View view){
           new Thread(new Runnable() {
               @Override            public void run() {
                   try {
                       URL url = new URL("http://10.0.2.2:9102/get/text");                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    connection.setConnectTimeout(10000); //连接时间                    connection.setRequestMethod("GET");//请求方法                    //设置请求头里面的一些属性                    connection.setRequestProperty("Accept-Language","zh-CN,zh;q=0.9");                    connection.setRequestProperty("Accept","*/*");                    connection.connect();                    //结果码                    int responseCode = connection.getResponseCode();                    if(responseCode==200){
                           //拿头部信息                        Map
   
    > headerFields = connection.getHeaderFields();                        //alt +enter 自动补全                        Set
    
     
      >> entries = headerFields.entrySet();                        for(Map.Entry
      
       
        > entry:entries){
                               Log.d(TAG,entry.getKey()+"=="+entry.getValue());                        }                        InputStream inputStream = connection.getInputStream();                        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));                        String line = bufferedReader.readLine();                        Log.d(TAG,"line-->"+line);                    }                } catch (Exception e) {
                       e.printStackTrace();                }            }        }).start();    }
       
      
     
    
   

展示数据 利用Gson 和Glide加载图片 小测试：

//适配器package com.example.mytext.adapters;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import androidx.annotation.NonNull;import androidx.recyclerview.widget.RecyclerView;import com.bumptech.glide.Glide;import com.example.mytext.R;import com.example.mytext.domain.GetTextItem;import java.util.ArrayList;import java.util.List;public class GetResultListAdpters  extends RecyclerView.Adapter
   
     {
   	//防止为null    private List
    
      mdata = new ArrayList<>();    @NonNull    @Override    public InnerHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
           View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_get_text,null);        InnerHolder innerHolder = new InnerHolder(view);        return innerHolder;    }    @Override    public void onBindViewHolder(@NonNull InnerHolder holder, int position) {
           View itemView = holder.itemView;        TextView title = itemView.findViewById(R.id.item_title);        ImageView iv = itemView.findViewById(R.id.iv_item);        GetTextItem.DataBean dataBean = mdata.get(position);        title.setText(dataBean.getTitle());        Glide.with(itemView.getContext()).load("http://10.0.2.2:9102"+mdata.get(position).getCover()).into(iv);    }    @Override    public int getItemCount() {
           return mdata.size();    }    public void setData(GetTextItem getTextItem) {
           mdata.clear();        mdata.addAll(getTextItem.getData());        notifyDataSetChanged();    }    public class InnerHolder extends RecyclerView.ViewHolder {
           public InnerHolder(@NonNull View itemView) {
               super(itemView);        }    }}
    
   

package com.example.mytext;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import androidx.recyclerview.widget.LinearLayoutManager;import androidx.recyclerview.widget.RecyclerView;import android.graphics.Canvas;import android.graphics.Rect;import android.os.Bundle;import android.util.Log;import android.view.View;import com.example.mytext.adapters.GetResultListAdpters;import com.example.mytext.domain.GetTextItem;import com.google.gson.Gson;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;import java.util.Map;import java.util.Set;public class TextActivity extends AppCompatActivity {
       private static final String TAG ="TextActivity" ;    private GetResultListAdpters adpters;    @Override    protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);        setContentView(R.layout.activity_text);        initView();    }    private void initView(){
           RecyclerView recyclerView = findViewById(R.id.result_list);        recyclerView.setLayoutManager(new LinearLayoutManager(this));        recyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
               @Override            public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
                   outRect.top =5;                outRect.bottom =5;            }        });         adpters =new GetResultListAdpters();        recyclerView.setAdapter(adpters);    }    public void loadJson(View view){
           new Thread(new Runnable() {
               @Override            public void run() {
                   try {
                       URL url = new URL("http://10.0.2.2:9102/get/text");                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    connection.setConnectTimeout(10000); //连接时间                    connection.setRequestMethod("GET");//请求方法                    //设置请求头里面的一些属性                    connection.setRequestProperty("Accept-Language","zh-CN,zh;q=0.9");                    connection.setRequestProperty("Accept","*/*");                    connection.connect();                    //结果码                    int responseCode = connection.getResponseCode();                    if(responseCode==200){
                           //拿头部信息                        Map
   
    > headerFields = connection.getHeaderFields();                        //alt +enter 自动补全                        Set
    
     
      >> entries = headerFields.entrySet();                        for(Map.Entry
      
       
        > entry:entries){
                               Log.d(TAG,entry.getKey()+"=="+entry.getValue());                        }                        InputStream inputStream = connection.getInputStream();                        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));                        String line = bufferedReader.readLine();                        //Log.d(TAG,"line-->"+line);                        Gson gson = new Gson();                        GetTextItem getTextItem = gson.fromJson(line,GetTextItem.class);                        updateUI(getTextItem);                    }                } catch (Exception e) {
                       e.printStackTrace();                }            }        }).start();    }    private void updateUI(GetTextItem getTextItem) {
           runOnUiThread(new Runnable() {
               @Override            public void run() {
                   adpters.setData(getTextItem);            }        });    }}
       
      
     
    
   

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