android:使用http协议将图片上传到自己的服务器

    由于http只支持上传的数据转化为字符串，对于想直接上传图片较不容易，故可以先将其转化为字节流，再将字节流转化为字符串。在此过程中经常出现错误，故可以考虑先将其用base64进行加密编码，在服务器端或客户端在将其通过base64解码成字节流，进而再转为相应的图片文件。

如图：

  客户端主要代码：

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.hexiaochun.utils.Base64Coder;
import android.graphics.Bitmap;

public class updaImage {
    public static void updata(Bitmap upbitmap) {

        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        upbitmap.compress(Bitmap.CompressFormat.JPEG, 60, stream);
        byte[] b = stream.toByteArray();
        /*
         * 将图片流以字符串形式存储下来,base64coder是一个常用的编码类， 经常用于各种网络数据传输时用来加密和解密
         * 用，用来确保数据的唯一性
         */
        String file = new String(Base64Coder.encodeLines(b));
        HttpClient client = new DefaultHttpClient();
        // 设置上传参数
        List<NameValuePair> formparams = new ArrayList<NameValuePair>();
        formparams.add(new BasicNameValuePair("file", file));
        HttpPost post = new HttpPost(MainActivity.HOST);
        UrlEncodedFormEntity entity;
        try {
            entity = new UrlEncodedFormEntity(formparams, "UTF-8");
            post.addHeader("Accept", "text/javascript, text/html, application/xml, text/xml");
            post.addHeader("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3");
            // 加消息报头，进行gzip压缩，提高网络开销
            post.addHeader("Accept-Encoding", "gzip,deflate,sdch");
            post.addHeader("Connection", "Keep-Alive");
            post.addHeader("Cache-Control", "no-cache");
            post.addHeader("Content-Type", "application/x-www-form-urlencoded");
            post.setEntity(entity);

            HttpResponse response = client.execute(post);
            System.out.println(response.getStatusLine().getStatusCode());
            HttpEntity e = response.getEntity();
            System.out.println(EntityUtils.toString(e));
            if (200 == response.getStatusLine().getStatusCode()) {
                System.out.println("上传完成");
            } else {
                System.out.println("上传失败");
            }
            client.getConnectionManager().shutdown();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

 

 

 

将图片进行压缩代码如下：

 

import android.graphics.Bitmap;
import android.graphics.Matrix;
/**
 * 
 * 裁剪图片类
 * 
 */
public class ZoomBitmap {
    /**
     * 
     * @param bgimage传入的图片
     * @param newWidth需要裁剪原图的长
     * @param newHeight
     * @return 裁剪后的图片
     */
    public static Bitmap zoomImage(Bitmap bgimage, double newWidth,
            double newHeight) {
        // 获取这个图片的宽和高
        float width = bgimage.getWidth();
        float height = bgimage.getHeight();
        // 创建操作图片用的matrix对象
        Matrix matrix = new Matrix();
        // 计算宽高缩放率
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // 缩放图片动作
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, (int) width,
                (int) height, matrix, true);
        return bitmap;
    }
}

服务端主要代码：
 

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hexiaochun.utils.Base64Coder;

public class UpServer extends HttpServlet {

    private String file;


    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        file = req.getParameter("file");
        if (file != null) {

            byte[] b = Base64Coder.decodeLines(file);
            String filepath = req.getSession().getServletContext()
                    .getRealPath("/files");
            File file = new File(filepath);
            if (!file.exists())
                file.mkdirs();
            FileOutputStream fos = new FileOutputStream(file.getPath()
                    + "/image" + (int) (Math.random() * 100) + ".bmp");
            System.out.println(file.getPath());
            fos.write(b);
            fos.flush();
            fos.close();
        }
    }

}

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