android上传图片

前端 andoid  activity用到的函数 
AsyncHttpClient  是一个框架提供的库  可以异步传输，使用时需下载android-async-http-1.4.4.jar包导入到项目中
public static void reg(final Context cont,Bitmap photodata,String regData) { 
        try { 
            ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
             
            //将bitmap一字节流输出 Bitmap.CompressFormat.PNG 压缩格式，100：压缩率，baos：字节流 
            photodata.compress(Bitmap.CompressFormat.PNG, 100, baos); 
            baos.close(); 
            byte[] buffer = baos.toByteArray(); 
            System.out.println("图片的大小："+buffer.length); 
             
            //将图片的字节流数据加密成base64字符输出 
            String photo = Base64.encodeToString(buffer, 0, buffer.length,Base64.DEFAULT); 
 
            //photo=URLEncoder.encode(photo,"UTF-8"); 
            RequestParams params = new RequestParams(); 
                    params.put("photo", photo); 
                        params.put("name", "woshishishi");//传输的字符数据 
                        String url = "http://10.0.2.2:8080/IC_Server/servlet/RegisterServlet1"; 
  
             
                        AsyncHttpClient client = new AsyncHttpClient(); 
                        client.post(url, params, new AsyncHttpResponseHandler() { 
                        @Override   
                    public void onSuccess(int statusCode, String content){   
                    Toast.makeText(cont, "头像上传成功!"+content, 0) 
                     .show();  
                         }   
                    @Override   
                    public void onFailure(Throwable e, String data){   
                    Toast.makeText(cont, "头像上传失败!", 0) 
                        .show();  
                } 
            }); 
  
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
 
    }

服务器中 serverlet中的代码：

package uestc.app.ic.server.servlet; 
 
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 sun.misc.BASE64Decoder; 
 
public class RegisterServlet1 extends HttpServlet { 
    public void doGet(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException { 
        request.setCharacterEncoding("utf-8"); 
        response.setCharacterEncoding("utf-8"); 
        response.setContentType("text/html"); 
        String photo = request.getParameter("photo"); 
        String name = request.getParameter("name"); 
 
        try { 
 
            // 对base64数据进行解码 生成 字节数组，不能直接用Base64.decode（）；进行解密 
            byte[] photoimg = new BASE64Decoder().decodeBuffer(photo); 
            for (int i = 0; i < photoimg.length; ++i) { 
                if (photoimg[i] < 0) { 
                    // 调整异常数据 
                    photoimg[i] += 256; 
                } 
            } 
 
            // byte[] photoimg = Base64.decode(photo);//此处不能用Base64.decode（）方法解密，我调试时用此方法每次解密出的数据都比原数据大  所以用上面的函数进行解密，在网上直接拷贝的，花了好几个小时才找到这个错误（菜鸟不容易啊） 
            System.out.println("图片的大小：" + photoimg.length); 
            File file = new File("e:", "decode.png"); 
            File filename = new File("e:\\name.txt"); 
            if (!filename.exists()) { 
                file.createNewFile(); 
            } 
            if (!file.exists()) { 
                file.createNewFile(); 
            } 
            FileOutputStream out = new FileOutputStream(file); 
            FileOutputStream out1 = new FileOutputStream(filename); 
            out1.write(name.getBytes()); 
            out.write(photoimg); 
            out.flush(); 
            out.close(); 
            out1.flush(); 
            out1.close(); 
        } catch (Exception e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
 
    }