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;
    }
}