java中远程http文件上传及file2multipartfile
工作中有时会遇到各种需求，你得变着法儿去解决，当然重要的是在什么场景中去完成。
比如Strut2中file类型如何转换成multipartfile类型，找了几天，发现一个变通的方法记录如下（虽然最后没有用上。。）：
1 private static MultipartFile getMulFileByPath(String picPath) { 2 3 FileItem fileItem = createFileItem(picPath); 4 5 MultipartFile mfile = new CommonsMultipartFile(fileItem); 6 7 return mfile; 8 9 } 10 11 12 13 private static FileItem createFileItem(String filePath) 14 15 { 16 17 FileItemFactory factory = new DiskFileItemFactory(16, null); 18 19 String textFieldName = "textField"; 20 21 int num = filePath.lastIndexOf("."); 22 23 String extFile = filePath.substring(num); 24 25 FileItem item = factory.createItem(textFieldName, "text/plain", true, 26 27 "MyFileName" + extFile); 28 29 File newfile = new File(filePath); 30 31 int bytesRead = 0; 32 33 byte[] buffer = new byte[4096]; 34 35 try 36 37 { 38 39 FileInputStream fis = new FileInputStream(newfile); 40 41 OutputStream os = item.getOutputStream(); 42 43 while ((bytesRead = fis.read(buffer, 0, 8192)) 44 45 != -1) 46 47 { 48 49 os.write(buffer, 0, bytesRead); 50 51 } 52 53 os.close(); 54 55 fis.close(); 56 57 } 58 59 catch (IOException e) 60 61 { 62 63 e.printStackTrace(); 64 65 } 66 67 return item; 68 69 }
好不容易写好了一个完整的远程上传方法，并且本地测试已经通过能用，提交后发现有个类实例化不了，debug发现是包不兼容问题（尴尬），
但是以前别人用过的东西，你又不能升级，主要是没权限，不得不去低级的版本中找变通的类似方法，即便方法已经过时了。。
//httpclient(4.5.3)远程传输文件工具类
1 public static Map<String, String> executeDriverServer(String driverUrl, Map<String, Object> param,String multipart, String contentType,int timeout,String picPath) throws Exception { 2 3 String res = ""; // 请求返回默认的支持json串 4 5 Map<String, String> map = new HashMap<String, String>(); 6 ContentType ctype = ContentType.create("content-disposition","UTF-8"); 7 8 Map<String, String> map = new HashMap<String, String>(); 9 10 HttpClientBuilder httpClientBuilder = HttpClientBuilder.create(); 11 12 CloseableHttpClient closeableHttpClient = httpClientBuilder.build(); 13 14 String res = ""; // 请求返回默认的支持json串 15 16 HttpResponse httpResponse = null; 17 18 try { 19 20 HttpPost httpPost = new HttpPost(driverUrl); 21 22 //设置请求和传输超时时间 23 24 RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(timeout).setConnectTimeout(5000).build(); 25 26 httpPost.setConfig(requestConfig); 27 28 // BTW 4.3版本不设置超时的话,一旦服务器没有响应,等待时间N久(>24小时)。 29 30 if(httpPost!=null){ 31 32 if("formdata".equals(multipart)){ 33 34 MultipartEntityBuilder mentity = MultipartEntityBuilder.create().setMode(HttpMultipartMode.RFC6532); 35 36 Set<String> keyset = param.keySet(); 37 38 for (String key : keyset) { 39 40 Object paramObj = Validate.notNull(param.get(key)); 41 42 if(paramObj instanceof MultipartFile) { 43 44 mentity.addBinaryBody(key, ((MultipartFile) paramObj).getInputStream(),ctype,((MultipartFile) paramObj).getOriginalFilename()); 45 46 }else if(paramObj instanceof File){ 47 48 mentity.addBinaryBody(key, (File)paramObj);//(key, new FileInputStream((File)paramObj),ctype,((File)paramObj).getName()); 49 50 }else{ 51 52 mentity.addPart(key,new StringBody(paramObj.toString(),ctype)); 53 54 //mentity.addTextBody(key,paramObj.toString()); 55 56 } 57 58 logger.info("key::::"+key); 59 60 logger.info("paramObj::::"+paramObj.toString()); 61 62 } 63 64 HttpEntity entity = mentity.build(); 65 66 HttpUriRequest post = RequestBuilder.post().setUri(driverUrl).setEntity(entity).build(); 67 68 httpResponse = closeableHttpClient.execute(post); 69 70 }else { 71 72 HttpEntity entity = convertParam(param, contentType); 73 74 httpPost.setEntity(entity); 75 76 httpResponse = closeableHttpClient.execute(httpPost); 77 78 } 79 80 if(httpResponse == null) { 81 82 throw new Exception("无返回结果"); 83 84 } 85 86 // 获取返回的状态码 87 88 int status = httpResponse.getStatusLine().getStatusCode(); 89 90 logger.info("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",状态="+status); 91 92 if(status == HttpStatus.SC_OK){ 93 94 HttpEntity entity2 = httpResponse.getEntity(); 95 96 InputStream ins = entity2.getContent(); 97 98 res = toString(ins); 99 100 ins.close(); 101 102 }else{ 103 104 InputStream fis = httpResponse.getEntity().getContent(); 105 106 Scanner sc = new Scanner(fis); 107 108 logger.info("Scanner:::::"+sc.next()); 109 110 logger.error("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",错误Code:"+status); 111 112 } 113 114 map.put("code", String.valueOf(status)); 115 116 map.put("result", res); 117 118 logger.info("执行Post方法请求返回的结果 = " + res); 119 120 } 121 122 } catch (ClientProtocolException e) { 123 124 map.put("code", HttpClientUtil.CLIENT_PROTOCOL_EXCEPTION_STATUS); 125 126 map.put("result", e.getMessage()); 127 128 } catch (UnsupportedEncodingException e) { 129 130 map.put("code", HttpClientUtil.UNSUPPORTED_ENCODING_EXCEPTION_STATUS); 131 132 map.put("result", e.getMessage()); 133 134 } catch (IOException e) { 135 136 map.put("code", HttpClientUtil.IO_EXCEPTION_STATUS); 137 138 map.put("result", e.getMessage()); 139 140 } finally { 141 142 try { 143 144 closeableHttpClient.close(); 145 146 } catch (IOException e) { 147 148 logger.error("调用httpClient出错", e); 149 150 throw new Exception("调用httpClient出错", e); 151 152 } 153 154 } 155 156 157 158 private static String toString(InputStream in) throws IOException{ 159 160 ByteArrayOutputStream os = new ByteArrayOutputStream(); 161 162 byte[] b = new byte[1024]; 163 164 int len; 165 166 while((len = in.read(b)) != -1) { 167 168 os.write(b, 0, len); 169 170 } 171 172 return os.toString("UTF-8"); 173 174 } 175 }
//httpclient(4.2.2)老版本远程传输文件工具类
1 public static Map<String, String> executeDriverServer(String driverUrl, Map<String, Object> param,String multipart, String contentType,int timeout,String picPath) throws Exception { 2 3 String res = ""; // 请求返回默认的支持json串 4 5 Map<String, String> map = new HashMap<String, String>(); 6 7 ContentType ctype = ContentType.create("content-disposition","UTF-8"); 8 9 HttpPost httpPost = new HttpPost(driverUrl); 10 11 MultipartEntity reqEntity = new MultipartEntity(); 12 13 Set<String> keyset = param.keySet(); 14 15 File tempFile = new File(picPath); 16 17 for (String key : keyset) { 18 19 Object paramObj = Validate.notNull(param.get(key)); 20 21 if(paramObj instanceof File) { 22 23 FileBody fileBody = new FileBody(tempFile); 24 25 reqEntity.addPart(key, fileBody); 26 27 }else{ 28 29 reqEntity.addPart(key,new StringBody(paramObj.toString())); 30 31 } 32 33 logger.info("key::::"+key); 34 35 logger.info("paramObj::::"+paramObj.toString()); 36 37 } 38 39 httpPost.setEntity(reqEntity); 40 41 HttpClient httpClient = new DefaultHttpClient(); 42 43 HttpResponse httpResponse = httpClient.execute(httpPost); 44 45 // 获取返回的状态码 46 47 int status = httpResponse.getStatusLine().getStatusCode(); 48 49 logger.info("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",状态="+status); 50 51 if(status == HttpStatus.SC_OK){ 52 53 HttpEntity entity2 = httpResponse.getEntity(); 54 55 InputStream ins = entity2.getContent(); 56 57 res = toString(ins); 58 59 ins.close(); 60 61 }else{ 62 63 InputStream fis = httpResponse.getEntity().getContent(); 64 65 Scanner sc = new Scanner(fis); 66 67 logger.info("Scanner:::::"+sc.next()); 68 69 logger.error("Post请求URL="+driverUrl+",请求的参数="+param.toString()+",请求的格式"+contentType+",错误Code:"+status); 70 71 } 72 73 map.put("code", String.valueOf(status)); 74 75 map.put("result", res); 76 77 logger.info("执行Post方法请求返回的结果 = " + res); 78 79 return map; 80 81 }
希望对大家有点帮助！平常心。
