Android上传图片到服务器（使用base64字节流的形式）

Android端图片处理：（传Bitmap对象）

/** 
 * 通过Base32将Bitmap转换成Base64字符串 
 * @param bit 
 * @return 
 */  
public String Bitmap2StrByBase64(Bitmap bit){  
   ByteArrayOutputStream bos=new ByteArrayOutputStream();  
   bit.compress(CompressFormat.JPEG, 40, bos);//参数100表示不压缩  
   byte[] bytes=bos.toByteArray();  
   return Base64.encodeToString(bytes, Base64.DEFAULT);  
}  

Android端发送数据：

/**
 * 调用setImgByStr()方法，第一个参数imgStr 为Bitmap转成Base64的字符串，
 * 第二个参数imgName为图片的名字，包含后缀名.jpg
*/
public static String host = "http://192.168.1.96:8080/ImageServer/";  
  
public static String getContent(String url) throws Exception {  
  
    StringBuilder sb = new StringBuilder();  
  
    HttpClient client = new DefaultHttpClient();  
    HttpParams httpParams = client.getParams();  
    // 设置网络超时参数  
    HttpConnectionParams.setConnectionTimeout(httpParams, 3000);  
  
    HttpConnectionParams.setSoTimeout(httpParams, 5000);  
    HttpResponse response = client.execute(new HttpGet(url));  
    HttpEntity entity = response.getEntity();  
    if (entity != null) {  
        BufferedReader reader = new BufferedReader(new InputStreamReader(  
                entity.getContent(), "UTF-8"), 8192);  
  
        String line = null;  
        while ((line = reader.readLine()) != null) {  
            sb.append(line + "\n");  
        }  
        reader.close();  
  
    }  
  
    return sb.toString();  
}  
public static HttpResponse post(Map<String, Object> params, String url) {  
  
    HttpClient client = new DefaultHttpClient();  
    HttpPost httpPost = new HttpPost(url);  
    httpPost.addHeader("charset", HTTP.UTF_8);  
    httpPost.setHeader("Content-Type",  
            "application/x-www-form-urlencoded; charset=utf-8");  
    HttpResponse response = null;  
    if (params != null && params.size() > 0) {  
        List<NameValuePair> nameValuepairs = new ArrayList<NameValuePair>();  
        for (String key : params.keySet()) {  
            nameValuepairs.add(new BasicNameValuePair(key, (String) params  
                    .get(key)));  
        }  
        try {  
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuepairs,  
                    HTTP.UTF_8));  
            response = client.execute(httpPost);  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        } catch (ClientProtocolException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        } catch (RuntimeException e) {  
            e.printStackTrace();  
        }  
    } else {  
        try {  
            response = client.execute(httpPost);  
        } catch (ClientProtocolException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
  
    return response;  
  
}  
public static Object getValues(Map<String, Object> params, String url) {  
    String token = "";  
    HttpResponse response = post(params, url);  
    if (response != null) {  
        try {  
            token = EntityUtils.toString(response.getEntity());  
            response.removeHeaders("operator");  
        } catch (ParseException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
    return token;  
}  
public static Object setImgByStr(String imgStr,String imgName){  
    String url =  host+"channel-uploadImage.action";  
    Map<String,Object> params = new HashMap<String, Object>();  
    params.put("imgStr", imgStr);  
    params.put("imgName", imgName);  
    return getValues(params, url);  
}  

后台接收数据：

public void uploadPhoto() {  
    //获取存储路径  
    HttpServletRequest request = ServletActionContext.getRequest();  
    String path = ServletActionContext.getServletContext().getRealPath("/")+"upload";  
    File file = new File(path);  
    if(!file.exists()){  
        file.mkdir();  
    }  
    String imgPath  = path + request.getParameter("imgName");  
    String imgStr = request.getParameter("imgStr");  
    boolean flag = string2Image(imgStr, imgPath);  
    JacksonUtil.responseJSON(response, flag);  
}  

后台图片处理：

/** 
 * 通过BASE64Decoder解码，并生成图片 
 * @param imgStr 解码后的string 
 */  
public boolean string2Image(String imgStr, String imgFilePath) {  
    // 对字节数组字符串进行Base64解码并生成图片  
    if (imgStr == null)  
        return false;  
    try {  
        // Base64解码  
        byte[] b = new BASE64Decoder().decodeBuffer(imgStr);  
        for (int i = 0; i < b.length; ++i) {  
            if (b[i] < 0) {  
                // 调整异常数据  
                b[i] += 256;  
            }  
        }  
        // 生成Jpeg图片  
        OutputStream out = new FileOutputStream(imgFilePath);  
        out.write(b);  
        out.flush();  
        out.close();  
        return true;  
    } catch (Exception e) {  
        return false;  
    }  
}     

最后 ! 如果上传成功Android端会收到true ，上传失败会收到false。

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