摘抄 ander图片上传

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Android模拟 HTTP multipart/form-data 请求协议信息实现图片上传       

        分类:            手机开发1391人阅读评论(0)收藏举报

问题:

Android应用中,当遇到填写用户信息、发表评论等操作,不可避免会遇到“form表单操作”(类似web form操作)上传图片的功能。

在这种情况下,使用Android的HTTPConnection/ ApacheHTTP 通过POST 和GET的方式就实现不了。

 

解决方法:

Android客户端通过模拟 HTTP multipart/form-data 请求协议信息实现图片上传。

 

  1. /**
  2. * 文件名称:UploadImage.java
  3. *
  4. * 版权信息:Apache License, Version 2.0
  5. *
  6. * 功能描述:实现图片文件上传。
  7. *
  8. * 创建日期:2011-5-10
  9. *
  10. * 作者:Bert Lee
  11. */ 
  12.  
  13. /*
  14. * 修改历史:
  15. */ 
  16. publicclass UploadImage { 
  17.     String multipart_form_data = "multipart/form-data"
  18.     String twoHyphens = "--"
  19.     String boundary = "****************fD4fH3gL0hK7aI6";    // 数据分隔符 
  20.     String lineEnd = System.getProperty("line.separator");    // The value is "\r\n" in Windows. 
  21.      
  22.     /*
  23.      * 上传图片内容,格式请参考HTTP 协议格式。
  24.      * 人人网Photos.upload中的”程序调用“http://wiki.dev.renren.com/wiki/Photos.upload#.E7.A8.8B.E5.BA.8F.E8.B0.83.E7.94.A8
  25.      * 对其格式解释的非常清晰。
  26.      * 格式如下所示:
  27.      * --****************fD4fH3hK7aI6
  28.      * Content-Disposition: form-data; name="upload_file"; filename="apple.jpg"
  29.      * Content-Type: image/jpeg
  30.      *
  31.      * 这儿是文件的内容,二进制流的形式
  32.      */ 
  33.     privatevoid addImageContent(Image[] files, DataOutputStream output) { 
  34.         for(Image file : files) { 
  35.             StringBuilder split = new StringBuilder(); 
  36.             split.append(twoHyphens + boundary + lineEnd); 
  37.             split.append("Content-Disposition: form-data; name=\"" + file.getFormName() + "\"; filename=\"" + file.getFileName() + "\"" + lineEnd); 
  38.             split.append("Content-Type: " + file.getContentType() + lineEnd); 
  39.             split.append(lineEnd); 
  40.             try
  41.                 // 发送图片数据 
  42.                 output.writeBytes(split.toString()); 
  43.                 output.write(file.getData(), 0, file.getData().length); 
  44.                 output.writeBytes(lineEnd); 
  45.             } catch (IOException e) { 
  46.                 thrownew RuntimeException(e); 
  47.             } 
  48.         } 
  49.     } 
  50.      
  51.     /*
  52.      * 构建表单字段内容,格式请参考HTTP 协议格式(用FireBug可以抓取到相关数据)。(以便上传表单相对应的参数值)
  53.      * 格式如下所示:
  54.      * --****************fD4fH3hK7aI6
  55.      * Content-Disposition: form-data; name="action"
  56.      * // 一空行,必须有
  57.      * upload
  58.      */ 
  59.     privatevoid addFormField(Set<Map.Entry<Object,Object>> params, DataOutputStream output) { 
  60.         StringBuilder sb = new StringBuilder(); 
  61.         for(Map.Entry<Object, Object> param : params) { 
  62.             sb.append(twoHyphens + boundary + lineEnd); 
  63.             sb.append("Content-Disposition: form-data; name=\"" + param.getKey() + "\"" + lineEnd); 
  64.             sb.append(lineEnd); 
  65.             sb.append(param.getValue() + lineEnd); 
  66.         } 
  67.         try
  68.             output.writeBytes(sb.toString());// 发送表单字段数据 
  69.         } catch (IOException e) { 
  70.             thrownew RuntimeException(e); 
  71.         } 
  72.     } 
  73.      
  74.     /**
  75.      * 直接通过 HTTP 协议提交数据到服务器,实现表单提交功能。
  76.      * @param actionUrl 上传路径
  77.      * @param params 请求参数key为参数名,value为参数值
  78.      * @param files 上传文件信息
  79.      * @return 返回请求结果
  80.      */ 
  81.     public String post(String actionUrl, Set<Map.Entry<Object,Object>> params, Image[] files) { 
  82.         HttpURLConnection conn = null
  83.         DataOutputStream output = null
  84.         BufferedReader input = null
  85.         try
  86.             URL url = new URL(actionUrl); 
  87.             conn = (HttpURLConnection) url.openConnection(); 
  88.             conn.setConnectTimeout(120000); 
  89.             conn.setDoInput(true);        // 允许输入 
  90.             conn.setDoOutput(true);        // 允许输出 
  91.             conn.setUseCaches(false);    // 不使用Cache 
  92.             conn.setRequestMethod("POST"); 
  93.             conn.setRequestProperty("Connection", "keep-alive"); 
  94.             conn.setRequestProperty("Content-Type", multipart_form_data + "; boundary=" + boundary); 
  95.              
  96.             conn.connect(); 
  97.             output = new DataOutputStream(conn.getOutputStream()); 
  98.              
  99.             addImageContent(files, output);    // 添加图片内容 
  100.              
  101.             addFormField(params, output);    // 添加表单字段内容 
  102.              
  103.             output.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);// 数据结束标志 
  104.             output.flush(); 
  105.              
  106.             int code = conn.getResponseCode(); 
  107.             if(code != 200) { 
  108.                 thrownew RuntimeException("请求‘" + actionUrl +"’失败!"); 
  109.             } 
  110.              
  111.             input = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
  112.             StringBuilder response = new StringBuilder(); 
  113.             String oneLine; 
  114.             while((oneLine = input.readLine()) != null) { 
  115.                 response.append(oneLine + lineEnd); 
  116.             } 
  117.              
  118.             return response.toString(); 
  119.         } catch (IOException e) { 
  120.             thrownew RuntimeException(e); 
  121.         } finally
  122.             // 统一释放资源 
  123.             try
  124.                 if(output != null) { 
  125.                     output.close(); 
  126.                 } 
  127.                 if(input != null) { 
  128.                     input.close(); 
  129.                 } 
  130.             } catch (IOException e) { 
  131.                 thrownew RuntimeException(e); 
  132.             } 
  133.              
  134.             if(conn != null) { 
  135.                 conn.disconnect(); 
  136.             } 
  137.         } 
  138.     } 
  139.      
  140.     publicstaticvoid main(String[] args) { 
  141.         try
  142.             String response = ""
  143.              
  144.             BufferedReader in = new BufferedReader(new FileReader("config/actionUrl.properties")); 
  145.             String actionUrl = in.readLine(); 
  146.              
  147.             // 读取表单对应的字段名称及其值 
  148.             Properties formDataParams = new Properties(); 
  149.             formDataParams.load(new FileInputStream(new File("config/formDataParams.properties"))); 
  150.             Set<Map.Entry<Object,Object>> params = formDataParams.entrySet(); 
  151.              
  152.             // 读取图片所对应的表单字段名称及图片路径 
  153.             Properties imageParams = new Properties(); 
  154.             imageParams.load(new FileInputStream(new File("config/imageParams.properties"))); 
  155.             Set<Map.Entry<Object,Object>> images = imageParams.entrySet(); 
  156.             Image[] files = new Image[images.size()]; 
  157.             int i = 0
  158.             for(Map.Entry<Object,Object> image : images) { 
  159.                 Image file = new Image(image.getValue().toString(), image.getKey().toString()); 
  160.                 files[i++] = file; 
  161.             } 
  162. //            Image file = new Image("images/apple.jpg", "upload_file"); 
  163. //            Image[] files = new Image[0]; 
  164. //            files[0] = file; 
  165.              
  166.             response = new UploadImage().post(actionUrl, params, files); 
  167.             System.out.println("返回结果:" + response); 
  168.         } catch (IOException e) { 
  169.             e.printStackTrace(); 
  170.         } 
  171.     } 
posted @ 2013-04-19 12:05  楼上少年  阅读(161)  评论(0编辑  收藏  举报