http协议get方式获取图片

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class GetImage {
    private static String PATH = "http://192.168.1.119:8080/ok/point_one.png";

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        savaDisk();
    }
    //存到本地
    public static void savaDisk(){
        InputStream in = getInputStream();
        FileOutputStream fos = null;
        byte[] data = new byte[1024];
        int len = 0;
        try {
            fos = new FileOutputStream("D:\test.png");
            while((len = in.read(data))!=-1){
                fos.write(data, 0, len);
            }
            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            if(in!=null){
                try {
                    in.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();
                }
                
            }
        }
    }
    
    public static InputStream getInputStream() {
        InputStream in = null;
        HttpURLConnection httpconn = null;
        try {
            // 声明url
            URL url = new URL(PATH);
            if (url != null) {
                // 建立客户端与服务器端链接
                httpconn = (HttpURLConnection) url.openConnection();
                // 设置网路超时时间,如果超过这个时间自动断开
                httpconn.setConnectTimeout(3000);
                // 打开输入流
                httpconn.setDoInput(true);
                // 设置请求方式
                httpconn.setRequestMethod("GET");
                // 获取响应的状态码
                int responseCode = httpconn.getResponseCode();
                // 判断是否是ok
                if (responseCode == 200) {
                    // 从服务器获得一个输入流
                    in = httpconn.getInputStream();

                }

            }

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return in;
    }

}

android4.0以下可以用

package com.example.getimg;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;


import java.io.InputStream;
import java.net.HttpURLConnection;

import java.net.URL;

public class MyActivity extends Activity {
    /**
     * Called when the activity is first created.
     */

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String path = "http://192.168.1.119:8080/ok/point_one.png";
                //uri
                try {
                    URL url = new URL(path);
                    //获得链接
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    //设置参数
                    conn.setRequestMethod("GET");
                    conn.setConnectTimeout(5000);
                    conn.setReadTimeout(5000);
                    //正式链接
                    conn.connect();
                    if(conn.getResponseCode()==200){
                        InputStream is = conn.getInputStream();
                        //把InputStream通过bitmap转化成图片
                        Bitmap bitmap = BitmapFactory.decodeStream(is);
                       ImageView img = (ImageView) findViewById(R.id.img);
                        img.setImageBitmap(bitmap);

                    }else{
                        Toast.makeText(MyActivity.this,"没有响应",Toast.LENGTH_SHORT).show();
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
}