利用AsyncHttpClient实现图片的上传与下载

图片上传

1.       /**
2. * @param path
3. *            要上传的文件路径
4. * @param url
5. *            服务端接收URL
6. * @throws Exception
7. */  
8. public static void uploadFile(String path, String url) throws Exception {  
9. File file = new File(path);  
10. if (file.exists() && file.length() > 0) {  
11. new AsyncHttpClient();  
12. new RequestParams();  
13. "uploadfile", file);  
14. // 上传文件  
15. new AsyncHttpResponseHandler() {  
16. @Override  
17. public void onSuccess(int statusCode, Header[] headers,  
18. byte[] responseBody) {  
19. // 上传成功后要做的工作  
20. "上传成功", Toast.LENGTH_LONG).show();  
21. 0);  
22.         }  
23.   
24. @Override  
25. public void onFailure(int statusCode, Header[] headers,  
26. byte[] responseBody, Throwable error) {  
27. // 上传失败后要做到工作  
28. "上传失败", Toast.LENGTH_LONG).show();  
29.         }  
30.   
31. @Override  
32. public void onProgress(int bytesWritten, int totalSize) {  
33. // TODO Auto-generated method stub  
34. super.onProgress(bytesWritten, totalSize);  
35. int count = (int) ((bytesWritten * 1.0 / totalSize) * 100);  
36. // 上传进度显示  
37.             progress.setProgress(count);  
38. "上传 Progress>>>>>", bytesWritten + " / " + totalSize);  
39.         }  
40.   
41. @Override  
42. public void onRetry(int retryNo) {  
43. // TODO Auto-generated method stub  
44. super.onRetry(retryNo);  
45. // 返回重试次数  
46.         }  
47.   
48.     });  
49. } else {  
50. "文件不存在", Toast.LENGTH_LONG).show();  
51. }

图片下载

1.       /**
2. * @param url
3. *            要下载的文件URL
4. * @throws Exception
5. */  
6. public static void downloadFile(String url) throws Exception {  
7.   
8. AsyncHttpClient client = new AsyncHttpClient();  
9. // 指定文件类型  
10. String[] allowedContentTypes = new String[] { "image/png", "image/jpeg" };  
11. // 获取二进制数据如图片和其他文件  
12. client.get(url, new BinaryHttpResponseHandler(allowedContentTypes) {  
13.   
14. @Override  
15. public void onSuccess(int statusCode, Header[] headers,  
16. byte[] binaryData) {  
17.         String tempPath = Environment.getExternalStorageDirectory()  
18. "/temp.jpg";  
19. // TODO Auto-generated method stub  
20. // 下载成功后需要做的工作  
21. 0);  
22. //  
23. "binaryData:", "共下载了：" + binaryData.length);  
24. //  
25. 0,  
26.                 binaryData.length);  
27.   
28. new File(tempPath);  
29. // 压缩格式  
30.         CompressFormat format = Bitmap.CompressFormat.JPEG;  
31. // 压缩比例  
32. int quality = 100;  
33. try {  
34. // 若存在则删除  
35. if (file.exists())  
36.                 file.delete();  
37. // 创建文件  
38.             file.createNewFile();  
39. //  
40. new FileOutputStream(file);  
41. // 压缩输出  
42.             bmp.compress(format, quality, stream);  
43. // 关闭  
44.             stream.close();  
45. //  
46. "下载成功\n" + tempPath,  
47.                     Toast.LENGTH_LONG).show();  
48.   
49. catch (IOException e) {  
50. // TODO Auto-generated catch block  
51.             e.printStackTrace();  
52.         }  
53.   
54.     }  
55.   
56. @Override  
57. public void onFailure(int statusCode, Header[] headers,  
58. byte[] binaryData, Throwable error) {  
59. // TODO Auto-generated method stub  
60. "下载失败", Toast.LENGTH_LONG).show();  
61.     }  
62.   
63. @Override  
64. public void onProgress(int bytesWritten, int totalSize) {  
65. // TODO Auto-generated method stub  
66. super.onProgress(bytesWritten, totalSize);  
67. int count = (int) ((bytesWritten * 1.0 / totalSize) * 100);  
68. // 下载进度显示  
69.         progress.setProgress(count);  
70. "下载 Progress>>>>>", bytesWritten + " / " + totalSize);  
71.   
72.     }  
73.   
74. @Override  
75. public void onRetry(int retryNo) {  
76. // TODO Auto-generated method stub  
77. super.onRetry(retryNo);  
78. // 返回重试次数  
79.     }  
80.   
81. });

PHP服务端

1. <?php  
2. $base_path = "./upload/"; // 接收文件目录  
3. $target_path = $base_path . basename ( $_FILES ['uploadfile'] ['name'] );  
4. if (move_uploaded_file ( $_FILES ['uploadfile'] ['tmp_name'], $target_path )) {  
5. $array = array (  
6. "code" => "1",  
7. "message" => $_FILES ['uploadfile'] ['name']   
8.     );  
9. echo json_encode ( $array );  
10. } else {  
11. $array = array (  
12. "code" => "0",  
13. "message" => "There was an error uploading the file, please try again!" . $_FILES ['uploadfile'] ['error']   
14.     );  
15. echo json_encode ( $array );  
16. }  
17. ?>

Service中类似的异常问题：

(com.zajt.zajtsafechat.http.AsyncHttpResponseHandler$ResponderHandler) {42843450} sending message to a Handler on a dead thread

解决办法：

 在Service中，AsyncHttpClient client = new SyncHttpClient();

 在Activity中，AsyncHttpClient client = new AsyncHttpClient();

其中SyncHttpClient是AsyncHttpClient的子类