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。
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：
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();
}
});
}
}
一步一步学会http获取tomcat服务端的图片，在android客户端显示
原文地址：http://blog.csdn.net/harryweasley/article/details/45824295
