Android学习笔记(十八)

Java工程

InternetTest

Java代码

package junit.test;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import org.junit.Test;
import junit.framework.TestCase;

public class InternetTest extends TestCase {

    public byte[] readStream(InputStream inputStream) throws Exception {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = -1;
        while ((len = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, len);
        }
        outputStream.close();
        inputStream.close();
        return outputStream.toByteArray();
    }

    // 请求图片
    @Test
    public void testGetImage() throws Exception {
        String urlpath = "";
        URL url = new URL(urlpath);
        // 利用HttpURLConnection对象,我们可以从网络中获取网页数据
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        // 如果超过android的组件阻塞时间,就会被系统回收
        // 设置连接超时
        conn.setConnectTimeout(6 * 1000);
        conn.setRequestMethod("GET");
        if (conn.getResponseCode() == 200) {
            // 得到网络返回的输入流
            InputStream inputStream = conn.getInputStream();
            byte[] data = readStream(inputStream);
            File file = new File("baidu.jpg");
            FileOutputStream outputStream = new FileOutputStream(file);
            outputStream.write(data);
            outputStream.close();
        } else {
            throw new RuntimeException("请求url失败");
        }
    }

    // 请求
    @Test
    public void testGetHtml() throws Exception {
        String urlpath = "";
        URL url = new URL(urlpath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(6 * 1000);
        conn.setRequestMethod("GET");
        if (conn.getResponseCode() == 200) {
            InputStream inputStream = conn.getInputStream();
            byte[] data = readStream(inputStream);
            System.out.println(new String(data));
        } else {
            throw new RuntimeException("请求url失败");
        }
    }
}