因为需要研究下断点上传的问题。找了很久终于找到一个比较好的项目。
效果：
上传中，显示进度，时间，百分比。
点击【Pause】暂停，点击【Resume】继续。
2，代码分析
项目进行了封装使用最简单的方法实现了http的断点上传。
因为html5 里面有读取文件分割文件的类库，所以才可以支持断点上传，所以这个只能在html5 支持的浏览器上面展示。
同时，在js 和 java 同时使用 cr32 进行文件块的校验，保证数据上传正确。
代码在使用了最新的servlet 3.0 的api，使用了异步执行，监听等方法。
上传类UploadServlet
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | @Component("javaLargeFileUploaderServlet") @WebServlet(name = "javaLargeFileUploaderServlet", urlPatterns = { "/javaLargeFileUploaderServlet" }) public class UploadServlet extends HttpRequestHandlerServlet implements HttpRequestHandler { private static final Logger log = LoggerFactory.getLogger(UploadServlet.class); @Autowired UploadProcessor uploadProcessor; @Autowired FileUploaderHelper fileUploaderHelper; @Autowired ExceptionCodeMappingHelper exceptionCodeMappingHelper; @Autowired Authorizer authorizer; @Autowired StaticStateIdentifierManager staticStateIdentifierManager; @Override public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws IOException { log.trace("Handling request"); Serializable jsonObject = null; try { // extract the action from the request UploadServletAction actionByParameterName = UploadServletAction.valueOf(fileUploaderHelper.getParameterValue(request, UploadServletParameter.action)); // check authorization checkAuthorization(request, actionByParameterName); // then process the asked action jsonObject = processAction(actionByParameterName, request); // if something has to be written to the response if (jsonObject != null) { fileUploaderHelper.writeToResponse(jsonObject, response); } } // If exception, write it catch (Exception e) { exceptionCodeMappingHelper.processException(e, response); } } private void checkAuthorization(HttpServletRequest request, UploadServletAction actionByParameterName) throws MissingParameterException, AuthorizationException { // check authorization // if its not get progress (because we do not really care about authorization for get // progress and it uses an array of file ids) if (!actionByParameterName.equals(UploadServletAction.getProgress)) { // extract uuid final String fileIdFieldValue = fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId, false); // if this is init, the identifier is the one in parameter UUID clientOrJobId; String parameter = fileUploaderHelper.getParameterValue(request, UploadServletParameter.clientId, false); if (actionByParameterName.equals(UploadServletAction.getConfig) && parameter != null) { |