Android：网络存储（3）

从web端同时取值和图片

1.布局

base.xml

2.web Servlet代码

public class MyServlet3 extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		doPost(request,response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setCharacterEncoding("utf-8");
		response.setHeader("Content-Type", "text/html; charset=utf-8");
		
		ArrayList<User> list=new ArrayList<User>();
         for(int i=0;i<10;i++){
        	 User user=new User();
        	 user.setUn("用户"+i);
        	 user.setPw("密码"+i);
        	 user.setPhoto("out.jpg");;
        	 list.add(user);
         }
         //只认json格式的串
         Gson g=new Gson();
         String info=g.toJson(list);
        PrintWriter out= response.getWriter();
        out.print(info);
        out.flush();
        out.close();
	}
}

3.MainActivity 代码

public class Main5Activity extends AppCompatActivity {
    private ListView listView;

    private String path="http://10.151.2.14:8080/lesson13/MyServlet3";
    ArrayList<User> list=new ArrayList<User>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main5);
        listView= (ListView) findViewById(R.id.listView);
        try {
            String info = new MyTask3().execute(path).get();
            JSONArray jsonArray=new JSONArray(info);//把json串变成一个数组
            for(int i=0;i<jsonArray.length();i++){
              JSONObject jsonObject= jsonArray.getJSONObject(i);
                User user=new User();
                user.setUn(jsonObject.get("un").toString());
                user.setPw(jsonObject.get("pw").toString());
               user.setPhoto(jsonObject.get("photo").toString());
                list.add(user);
            }
            Log.i("message",info);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }

        listView.setAdapter(new MyAdapter());
    }
    class MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            return list.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view;
           if(convertView==null){
               view= LayoutInflater.from(Main5Activity.this).inflate(R.layout.base,null);
        }else {
               view=convertView;
           }
            TextView un= (TextView) view.findViewById(R.id.textView);
           // TextView pw= (TextView) view.findViewById(R.id.pw);
            un.setText(list.get(position).getUn());
            //pw.setText(list.get(position).getPw());

        ImageView imageView= (ImageView) view.findViewById(R.id.imageView3);

            String pathImg="http://10.151.2.14:8080/lesson13/image/"+list.get(position).getPhoto();
            try {
                Bitmap bitmap=  new MyTask4().execute(pathImg).get();
                imageView.setImageBitmap(bitmap);
            } catch (Exception e) {
                e.printStackTrace();
            }

            return view;
        }
    }
}
class MyTask3 extends AsyncTask<String,Void,String>{

    @Override
    protected String doInBackground(String... params) {

        //post方式传值
        try {
            HttpURLConnection httpURLConnection= (HttpURLConnection) new URL(params[0]).openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setReadTimeout(8000);

            //接到响应的数据
            InputStream inputStream=httpURLConnection.getInputStream();
            //实际的数据是字符串 把inputStream变成reader
            Reader reader=new InputStreamReader(inputStream);
           //一行一行读
            BufferedReader bufferedReader=new BufferedReader(reader);

            StringBuffer stringBuffer=new StringBuffer();
            String str=null;
            while((str=bufferedReader.readLine())!=null){
                stringBuffer.append(str);
            }
            return stringBuffer.toString();
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }

    }
}
class MyTask4 extends AsyncTask<String,Void,Bitmap>{

    @Override
    protected Bitmap doInBackground(String... params) {

        try {
            HttpURLConnection httpURLConnection= (HttpURLConnection) new URL(params[0]).openConnection();
            //post方式传值
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setReadTimeout(8000);

            Bitmap bitmap= BitmapFactory.decodeStream(httpURLConnection.getInputStream());

            return bitmap;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    @Override
    protected void onPostExecute(Bitmap bitmap) {
        super.onPostExecute(bitmap);
    }
}

4，安卓和web端都有实体类

public class User {
	//web 上传file 把图片名写到数据库
	//把对应数据库图片名字的图片写到服务器
	//从数据库查询数据 得到图片名 根据图片名去服务器找图片
	private String un;
	private String pw;
	private String photo;//只存文件名
	public String getUn() {
		return un;
	}
	public void setUn(String un) {
		this.un = un;
	}
	public String getPw() {
		return pw;
	}
	public void setPw(String pw) {
		this.pw = pw;
	}
	public String getPhoto() {
		return photo;
	}
	public void setPhoto(String photo) {
		this.photo = photo;
	}
}