一步一步学会http获取tomcat服务端的图片,在android客户端显示
最简单的利用服务端来下载图片到客户端上面,刚开始接触,记录一下,同时希望帮助到新人。
在看本篇文章之前,你可以先看下这两篇文章
加载web项目时报的错误:Tomcat version 6.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 Web modul
http://blog.csdn.net/harryweasley/article/details/45723443
Eclipse无法启动tomcat
http://blog.csdn.net/harryweasley/article/details/45723437
转载请注明出处:http://blog.csdn.net/harryweasley/article/details/45824295谢谢。
服务端操作步骤:
我用的编辑器是java EE Eclipse集成tomcat6.0的,如图所示:
创建文件:File-->New -->Dynamic Web Project,然后如图所示:
注意:这里的Dynamic web module version我选的是2.5,关于原因,你可以查看http://blog.csdn.net/harryweasley/article/details/45723443
然后点击Finish。
然后复制两个图片到WebContent下,最终效果如图所示:
运行服务端,看是否有问题。
点击项目,右键,Run As--->Run on Server,执行结果如图所示:
不过不要担心,去掉Test/,则变成了
如果http://localhost:8080/还是404的话,你可以点击http://blog.csdn.net/harryweasley/article/details/45723437查看
解决以上问题后,输入http://localhost:8080/Test/battery.png这个网址后,显示的内容应该是图片的内容。
关于本机ip地址,你可以打开电脑cmd,输入ipconfig查看,当前ip地址
我的本地ip地址为192.168.1.48,所以,当我输入以下地址,也是可以显示同样的效果的:
客户端操作步骤:
package com.example.animal; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.Handler; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class HttpGetActivity extends Activity { ImageView img; Button btn, save; URL url; Bitmap bitmap; HttpURLConnection httpURLConnection; InputStream is; FileOutputStream fos; Runnable run = new Runnable() { @Override public void run() { String urlname = "http://192.168.1.48:8080/Test/test.jpg"; try { url = new URL(urlname); httpURLConnection = (HttpURLConnection) url.openConnection(); httpURLConnection.setConnectTimeout(3000); //允许输入流 httpURLConnection.setDoInput(true); //设置连接方式为GET,默认就是get请求方式 httpURLConnection.setRequestMethod("GET"); int responseCode = httpURLConnection.getResponseCode(); // 状态码等于200,表示正确 if (responseCode == 200) { is = httpURLConnection.getInputStream(); } bitmap = BitmapFactory.decodeStream(is); Log.i("测试", bitmap + ""); handler.sendEmptyMessage(0); } catch (Exception e) { e.printStackTrace(); } finally { if (is != null) { try { is.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } }; Runnable run2 = new Runnable() { @Override public void run() { String urlname = "http://192.168.1.48:8080/Test/test.jpg"; try { url = new URL(urlname); httpURLConnection = (HttpURLConnection) url.openConnection(); httpURLConnection.setConnectTimeout(3000); httpURLConnection.setDoInput(true); httpURLConnection.setRequestMethod("GET"); int responseCode = httpURLConnection.getResponseCode(); // 状态码等于200,表示正确 if (responseCode == 200) { is = httpURLConnection.getInputStream(); } File file=new File("sdcard/test/"); file.mkdirs(); fos = new FileOutputStream("sdcard/test/test.jpg"); byte[] date = new byte[1024]; int len; while ((len = is.read(date)) != -1) { fos.write(date, 0, len); } } catch (Exception e) { e.printStackTrace(); } finally { if (is != null) { try { is.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (fos != null) { try { fos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } }; StringBuffer sb; Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { img.setImageBitmap(bitmap); }; }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); img = (ImageView) findViewById(R.id.frame_image); btn = (Button) findViewById(R.id.run); save = (Button) findViewById(R.id.save); btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { new Thread(run).start(); } }); save.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub new Thread(run2).start(); } }); } }
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