做了一个读取网络图片的demo，却总是显示有连接异常，大家帮小弟我看下吧

做了一个读取网络图片的demo，却总是显示有连接错误，大家帮我看下吧
我是在jdk1.7 eclipse3.7 和avd Google2.2下面做的，Tomcat版本是7.0。
在eclipse中配置了tomcat插件后，我在ie中输入我的图片地址（http://127.0.0.1/tomcat.png）是可以打开这个tomcat小图片的，说明tomcat配置没有问题。
在模拟器中调试之后，显示“读取数据错误”，应该就是下面
if(e instanceof IOException){
Toast.makeText(this, "读取数据错误 ", Toast.LENGTH_SHORT).show();
}
打印出来的错误。
大家帮我看看，哪里连接有问题？

XML code

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/please_input_address" />    <EditText        android:id="@+id/et_address"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="http://127.0.0.1/tomcat.png"        android:lines="2" />    <Button        android:id="@+id/bt_view"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/bt_view_text" />    <ImageView        android:id="@+id/iv_image"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:scaleType="center" /></LinearLayout>

Java code

package cn.itcast.viewer;import java.io.IOException;import java.net.SocketTimeoutException;import cn.itcast.viewer.service.ImageUtil;import android.app.Activity;import android.graphics.Bitmap;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;public class DemoActivity extends Activity implements OnClickListener {    private EditText mEtAddress;    private Button mBtView;    private ImageView mIvView;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        mEtAddress = (EditText) this.findViewById(R.id.et_address);        mBtView = (Button) this.findViewById(R.id.bt_view);        mIvView = (ImageView) this.findViewById(R.id.iv_image);                mBtView.setOnClickListener(this);            }    public void onClick(View v) {        switch (v.getId()) {        case R.id.bt_view:            //按钮对应的点击事件             String address = mEtAddress.getText().toString().trim();            if("".equals(address)){                Toast.makeText(this, "图片地址不能为空", Toast.LENGTH_SHORT).show();                return;            }            try {                Bitmap bitmap = ImageUtil.getImage(address);                mIvView.setImageBitmap(bitmap);            } catch (Exception e) {                if(e instanceof SocketTimeoutException){                    Toast.makeText(this, "网络连接超时", Toast.LENGTH_SHORT).show();                }else if(e instanceof IOException){                    Toast.makeText(this, "读取数据错误 ", Toast.LENGTH_SHORT).show();                }else{                    Toast.makeText(this, "未知错误 ", Toast.LENGTH_SHORT).show();                }                e.printStackTrace();            }            break;        }            }}

Java code

package cn.itcast.viewer.service;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import cn.itcast.viewer.util.StreamTool;import android.graphics.Bitmap;import android.graphics.BitmapFactory;public class ImageUtil {/** * 获取网络address地址对应的图片 * @param address * @return bitmap的类型  */    public static Bitmap getImage(String address) throws Exception{        //通过代码 模拟器浏览器访问图片的流程         URL url = new URL(address);        HttpURLConnection conn =  (HttpURLConnection) url.openConnection();        conn.setRequestMethod("GET");        conn.setConnectTimeout(5000);        //获取服务器返回回来的流         InputStream is = conn.getInputStream();        byte[] imagebytes = StreamTool.getBytes(is);        Bitmap bitmap = BitmapFactory.decodeByteArray(imagebytes, 0, imagebytes.length);        return bitmap;    }} 
 

Java code

package cn.itcast.viewer.util;import java.io.ByteArrayOutputStream;import java.io.InputStream;public class StreamTool {    /**     * 把一个inputstream里面的内容转化成一个byte[]      */        public static byte[] getBytes(InputStream is) throws Exception{        ByteArrayOutputStream bos = new ByteArrayOutputStream();        byte[] buffer = new byte[1024];        int len = 0;        while((len = is.read(buffer))!=-1){            bos.write(buffer, 0, len);        }        is.close();        bos.flush();        byte[] result = bos.toByteArray();        System.out.println(new String(result));        return  result;    }}