Android 从服务器获取信息并显示（包含服务器端代码）

一时失言乱红尘 2022-07-24 11:30 180阅读 0赞

*   *  服务器端代码
        
         *  Bookjavabean和app端保持一致
         *  将书籍信息的list转换成json 生成gson数据
         *  app端请求的urlhttp1151591521798080BaidudemoservletTest
     *  android端
        
         *  Adapter

--------------------

## 服务器端代码： ##

### Book(javabean和app端保持一致) ###

package com.shengsheng.mhandler;
    /** * Created by Administrator on 2016/5/15. * 椹壇鏉鹃紶 */
    public class Book { 
        private int bookid;
        private double price;
        private String name;
        private String imgUrl;
        public int getBookid() {
            return bookid;
        }
        public void setBookid(int bookid) {
            this.bookid = bookid;
        }
        public double getPrice() {
            return price;
        }
        public void setPrice(double d) {
            this.price = d;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public String getImgUrl() {
            return imgUrl;
        }
        public void setImgUrl(String imgUrl) {
            this.imgUrl = imgUrl;
        }
    
    
    
    }

### 将书籍信息的list转换成json 生成gson数据 ###

public class Test extends HttpServlet { 
    
        /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
    
            response.setContentType("text/html");
            response.setCharacterEncoding("utf-8");
    
            List<Book> list = new ArrayList<Book>();
            // 初始化100条数据
            for (int i = 0; i < 30; i++) {
                Book book = new Book();
                book.setBookid(i);
                book.setName("商品名称" + i);
                book.setPrice(i + 20.0);
                book.setImgUrl("Baidudemo/images/a3.jpg");
    
                list.add(book);
            }
    
            Gson gson = new Gson();
            String recuits = gson.toJson(list);
            JSONObject jsonORG = new JSONObject();
    
    
            jsonORG.put("recruits", recuits);
            jsonORG.put("code", 200);
            String jsonString = jsonORG.toString();
            System.out.println("招聘信息为：" + jsonString);
            OutputStream os = response.getOutputStream();
            os.write(jsonString.getBytes("utf-8"));
            os.close();
        }
    
        /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */
        public void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            doGet(request, response);
        }
    
    }

### app端请求的url：[http://115.159.152.179:8080/Baidudemo/servlet/Test][http_115.159.152.179_8080_Baidudemo_servlet_Test] ###

--------------------

## android端 ##

思路：用`Httpurlconnection` 建立get请求 得到json字符串 解析json 得到  
`List<Book>` 然后设置适配器展示数据

public class MainActivity extends AppCompatActivity { 
        private RecyclerView mRecyclerViewBook;
        private List<Book> books;
        Handler handler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                mRecyclerViewBook.setAdapter(new MyAdaptr(MainActivity.this,books));
            }
        };
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            mRecyclerViewBook = (RecyclerView) findViewById(R.id.rvBook);
            mRecyclerViewBook.setLayoutManager(new GridLayoutManager(this, 2));
            //开启子线程 
           new Thread(){
               @Override
                public void run() {
                   super.run();
                    getDataForServer("http://49.122.47.217:8080/Baidudemo/servlet/Test");
                }
            }.start();
        }
    
        }
        /** *HttpURLConnection * 从服务器获取 图书商品列表信息 */
        public void getDataForServer(String urlstr) {
            try {
                URL url=new URL(urlstr);
                HttpURLConnection conn= (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                if(conn.getResponseCode()==200){
                    //得到的是输入流 转换成json字符串
                    InputStream in=conn.getInputStream();
                    String result=StreamUtils.readStread(in);
                    //解析json字符串
                    JSONObject jsonboject=new JSONObject(result);
                    String code=jsonboject.getString("code");
                    String recruits=jsonboject.getString("recruits");
                    //用GSON 解析集合
                    Gson gson=new Gson();
                     books=gson.fromJson(recruits,new TypeToken<List<Book>>(){}.getType());
                    handler.sendEmptyMessage(1);
    //
    
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    
    
    }

### Adapter ###

package cn.zsp.bookdemo;
    
    import android.app.Activity;
    import android.support.v7.widget.RecyclerView;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.TextView;
    
    import com.bumptech.glide.Glide;
    
    import java.util.List;
    
    /** * 项目名称：BookDemo * 类描述： * 创建人：my * 创建时间：2016/5/22 14:52 * 修改人：my * 修改时间：2016/5/22 14:52 * 修改备注： */
    public class MyAdaptr extends RecyclerView.Adapter<MyAdaptr.MyHolder> { 
        private Activity mActivity;
        private List<Book>  mBookList;
        public MyAdaptr(Activity activity, List<Book> books){
            mActivity=activity;
            mBookList=books;
        }
        @Override
        public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view= LayoutInflater.from(mActivity).inflate(R.layout.recycleview_book_item,parent,false);
            return new MyHolder(view);
        }
    
        @Override
        public void onBindViewHolder(MyHolder holder, int position) {
            Book book=mBookList.get(position);
            holder.tvName.setText(book.getName());
            holder.tvPrice.setText(book.getPrice()+"");
            //使用Glide 加载网络图片
            Log.e("zsp", book.getImgUrl() );
            Glide.with(mActivity).load("http://49.122.47.217:8080/"+book.getImgUrl()).into(holder.ivPhoto);
        }
        @Override
        public int getItemCount() {
            return mBookList.size();
        }
    
        class MyHolder extends RecyclerView.ViewHolder{ 
            private ImageView ivPhoto;
            private TextView tvName;
            private TextView tvPrice;
            public MyHolder(View itemView) {
                super(itemView);
                ivPhoto= (ImageView) itemView.findViewById(R.id.ivPhoto);
                tvName= (TextView) itemView.findViewById(R.id.tvName);
                tvPrice= (TextView) itemView.findViewById(R.id.tvPrice);
    
            }
        }
    }

[http_115.159.152.179_8080_Baidudemo_servlet_Test]: http://115.159.152.179:8080/Baidudemo/servlet/Test