请求服务器图片并显示

1.客户端

 1 package com.jingle.requestimg;

 2 

 3 import org.apache.http.Header;

 4 

 5 import com.loopj.android.http.AsyncHttpClient;

 6 import com.loopj.android.http.AsyncHttpResponseHandler;

 7 import com.loopj.android.http.RequestParams;

 8 

 9 import android.app.Activity;

10 import android.graphics.Bitmap;

11 import android.graphics.BitmapFactory;

12 import android.os.Bundle;

13 import android.view.View;

14 import android.view.View.OnClickListener;

15 import android.widget.Button;

16 import android.widget.ImageView;

17 

18 public class MainActivity extends Activity {

19     private String url = "http://192.168.1.101:8080/Login/servlet/ReturnImg";

20 

21     private ImageView imageView;

22 

23     @Override

24     protected void onCreate(Bundle savedInstanceState) {

25         super.onCreate(savedInstanceState);

26         setContentView(R.layout.activity_main);

27 

28         initImgView();

29         initBtn();

30     }

31 

32     private void initImgView() {

33         imageView = (ImageView) findViewById(R.id.img);

34     }

35 

36     private void initBtn() {

37         Button btn = (Button) findViewById(R.id.btn);

38         btn.setOnClickListener(new OnClickListener() {

39 

40             @Override

41             public void onClick(View v) {

42                 getServerImg();

43 

44             }

45         });

46     }

47 

48     private void getServerImg() {

49         AsyncHttpClient client = new AsyncHttpClient();

50         client.setTimeout(3000);

51         RequestParams params = new RequestParams();

52         params.put("img", "img");

53         client.post(url, params, new AsyncHttpResponseHandler() {

54 

55             @Override

56             public void onSuccess(int statusCode, Header[] headers,

57                     byte[] responseBody) {

58                 if (responseBody != null) {

59                     Bitmap bmp = BitmapFactory.decodeByteArray(responseBody, 0,

60                             responseBody.length);

61                     imageView.setImageBitmap(bmp);

62                 }

63             }

64 

65             public void onFailure(int statusCode, Header[] headers,

66                     byte[] responseBody, Throwable error) {

67                 error.printStackTrace();

68             }

69         });

70     }

71 

72 }

2.服务器端

 1 package action;

 2 

 3 import java.io.FileInputStream;

 4 import java.io.IOException;

 5 

 6 import java.io.OutputStream;

 7 

 8 import javax.servlet.ServletException;

 9 import javax.servlet.http.HttpServlet;

10 import javax.servlet.http.HttpServletRequest;

11 import javax.servlet.http.HttpServletResponse;

12 

13 public class ReturnImg extends HttpServlet {

14 

15     private static final long serialVersionUID = -70601451108821183L;

16     private static final String JPG = "image/jpeg;charset=GB2312";

17 

18     public void doGet(HttpServletRequest request, HttpServletResponse response)

19             throws ServletException, IOException {

20 

21         doPost(request, response);

22     }

23 

24     public void doPost(HttpServletRequest request, HttpServletResponse response)

25             throws ServletException, IOException {

26         System.out.println("do post");

27         String webRootUrl = request.getServletContext().getRealPath("")

28                 + "//guan.jpg";

29         if ("img".equals(request.getParameter("img"))) {

30 

31             FileInputStream fis = new FileInputStream(webRootUrl);

32             int size = fis.available();

33             byte[] data = new byte[size];

34             fis.read(data);

35             fis.close();

36             response.setContentType(JPG);

37             OutputStream os = response.getOutputStream();

38             os.write(data);

39             os.flush();

40             os.close();

41 

42         }

43 

44     }

45 

46 }