Java Applet实现简单即时通讯(IM)技术解析

版权申诉
0 下载量 66 浏览量 更新于2024-10-24 收藏 9KB RAR 举报
资源摘要信息:"Java即时通讯(IM)实现方法及Applet应用案例" 知识点详细说明: 1.即时通讯(IM)概念: 即时通讯(Instant Messaging,简称IM),是一种基于互联网的在线沟通方式。它允许用户发送即时消息给一位或多为用户,实现在线文字、声音、视频等信息的实时交换。IM在个人交流、商务沟通中得到了广泛的应用。 2.Java即时通讯(IM)实现: 在Java中实现即时通讯通常涉及到网络编程的知识,主要包括TCP/IP协议的使用和Java的网络类库。在本案例中,使用了简单的Socket编程来实现IM的基本功能。Socket编程是网络通信的基础,它允许一个程序通过网络连接到其他程序。在Java中,通常使用***包提供的类如ServerSocket和Socket类来创建服务器和客户端。 3.Applet技术应用: Applet是Java提供的一种可以在Web页面内运行的小应用程序,可以看作是一个嵌入在HTML页面中的Java小程序。在本案例中,Applet被用来在客户端实现用户界面。由于本案例提到使用Eclipse 3.2和Tomcat 5.5进行调试,可以推断出Applet与服务器端的Socket通信是通过Web服务器来实现的。 4.开发环境配置: 在描述中提到使用Eclipse 3.2和Tomcat 5.5作为开发环境。Eclipse是一个开放源代码的集成开发环境(IDE),而Tomcat是Apache软件基金会开发的一个小型的轻量级应用服务器,用于运行Java的Servlet和JSP页面。 5.调试过程: 描述中说明这个项目在Eclipse 3.2和Tomcat 5.5的环境中成功进行了调试。调试是一个重要步骤,它涉及到代码的编译、运行和错误修正。在这个过程中,开发者需要确保代码能够正确运行,并且在遇到任何问题时能够快速定位并解决问题。 6.文件结构和内容: 压缩包内的文件列表中包含了"***.txt"和"IM"两个文件。虽然具体文件内容没有提供,但"***.txt"可能是与项目相关的在线资源链接或说明文档,而"IM"可能是指代即时通讯程序的主文件或目录。通常情况下,一个Java项目会有多个文件和文件夹,包括源代码文件(.java)、编译后的字节码文件(.class)、资源文件、配置文件等。 7.技术细节: 在实现一个基本的即时通讯系统时,可能需要涉及的技术点包括网络通信协议的理解、多线程编程(处理多个客户端连接)、用户界面设计(如何显示消息和用户输入框)、以及网络异常处理(例如网络断开、数据传输错误等)。本案例中的实现较为简单,因此可能只涵盖了这些技术点的基础。 综上所述,本案例描述了一个使用Java技术实现的即时通讯系统,通过Applet在客户端显示用户界面,利用Socket编程在客户端和服务器之间进行通信,并在Eclipse和Tomcat环境中进行了调试。这个案例为理解Java在网络编程以及Web应用开发中的应用提供了一个实用的参考。

from pdb import set_trace as st import os import numpy as np import cv2 import argparse parser = argparse.ArgumentParser('create image pairs') parser.add_argument('--fold_A', dest='fold_A', help='input directory for image A', type=str, default='../dataset/50kshoes_edges') parser.add_argument('--fold_B', dest='fold_B', help='input directory for image B', type=str, default='../dataset/50kshoes_jpg') parser.add_argument('--fold_AB', dest='fold_AB', help='output directory', type=str, default='../dataset/test_AB') parser.add_argument('--num_imgs', dest='num_imgs', help='number of images',type=int, default=1000000) parser.add_argument('--use_AB', dest='use_AB', help='if true: (0001_A, 0001_B) to (0001_AB)',action='store_true') args = parser.parse_args() for arg in vars(args): print('[%s] = ' % arg, getattr(args, arg)) splits = os.listdir(args.fold_A) for sp in splits: img_fold_A = os.path.join(args.fold_A, sp) img_fold_B = os.path.join(args.fold_B, sp) img_list = os.listdir(img_fold_A) if args.use_AB: img_list = [img_path for img_path in img_list if '_A.' in img_path] num_imgs = min(args.num_imgs, len(img_list)) print('split = %s, use %d/%d images' % (sp, num_imgs, len(img_list))) img_fold_AB = os.path.join(args.fold_AB, sp) if not os.path.isdir(img_fold_AB): os.makedirs(img_fold_AB) print('split = %s, number of images = %d' % (sp, num_imgs)) for n in range(num_imgs): name_A = img_list[n] path_A = os.path.join(img_fold_A, name_A) if args.use_AB: name_B = name_A.replace('_A.', '_B.') else: name_B = name_A path_B = os.path.join(img_fold_B, name_B) if os.path.isfile(path_A) and os.path.isfile(path_B): name_AB = name_A if args.use_AB: name_AB = name_AB.replace('_A.', '.') # remove _A path_AB = os.path.join(img_fold_AB, name_AB) im_A = cv2.imread(path_A, cv2.IMREAD_COLOR) im_B = cv2.imread(path_B, cv2.IMREAD_COLOR) im_AB = np.concatenate([im_A, im_B], 1) cv2.imwrite(path_AB, im_AB),解释上述代码,并告诉我怎么设置文件夹格式

2023-06-10 上传

根据实验所测数据F:0.160; w:1.005; lgw:0.002; DA:2.000; AD:2.004; M:1.002; DB:0.017; DU:-0.778; Re:1.002; Im:-0.014; F:0.200; w:1.257; lgw:0.099; DA:2.000; AD:2.006; M:1.003; DB:0.026; DU:-1.224; Re:1.003; Im:-0.021; F:0.250; w:1.571; lgw:0.196; DA:2.000; AD:2.011; M:1.006; DB:0.048; DU:-2.610; Re:1.004; Im:-0.046; F:0.320; w:2.011; lgw:0.303; DA:2.000; AD:2.018; M:1.009; DB:0.078; DU:-2.045; Re:1.008; Im:-0.036; F:0.400; w:2.513; lgw:0.400; DA:2.000; AD:2.031; M:1.016; DB:0.134; DU:-2.880; Re:1.014; Im:-0.051; F:0.500; w:3.142; lgw:0.497; DA:2.000; AD:2.050; M:1.025; DB:0.214; DU:-6.120; Re:1.019; Im:-0.109; F:0.630; w:3.958; lgw:0.597; DA:2.000; AD:2.079; M:1.040; DB:0.336; DU:-8.838; Re:1.027; Im:-0.160; F:0.800; w:5.027; lgw:0.701; DA:2.000; AD:2.133; M:1.067; DB:0.559; DU:-8.208; Re:1.056; Im:-0.152; F:1.000; w:6.283; lgw:0.798; DA:2.000; AD:2.219; M:1.110; DB:0.903; DU:-14.040; Re:1.076; Im:-0.269; F:1.260; w:7.917; lgw:0.899; DA:2.000; AD:2.363; M:1.182; DB:1.449; DU:-15.869; Re:1.136; Im:-0.323; F:1.590; w:9.990; lgw:1.000; DA:2.000; AD:2.634; M:1.317; DB:2.392; DU:-24.638; Re:1.197; Im:-0.549; F:2.000; w:12.566; lgw:1.099; DA:2.000; AD:3.056; M:1.528; DB:3.682; DU:-43.200; Re:1.114; Im:-1.046; F:2.520; w:15.834; lgw:1.200; DA:2.000; AD:3.303; M:1.652; DB:4.358; DU:-78.466; Re:0.330; Im:-1.618; F:3.180; w:19.981; lgw:1.301; DA:2.000; AD:2.475; M:1.238; DB:1.851; DU:-116.222; Re:-0.547; Im:-1.110; F:4.000; w:25.133; lgw:1.400; DA:2.000; AD:1.437; M:0.719; DB:-2.871; DU:-140.400; Re:-0.554; Im:-0.458; F:5.000; w:31.416; lgw:1.497; DA:2.000; AD:0.834; M:0.417; DB:-7.597; DU:-156.600; Re:-0.383; Im:-0.166; F:6.340; w:39.835; lgw:1.600; DA:2.000; AD:0.473; M:0.237; DB:-12.523; DU:-161.259; Re:-0.224; Im:-0.076; F:8.000; w:50.265; lgw:1.701; DA:2.000; AD:0.253; M:0.127; DB:-17.958; DU:-166.320; Re:-0.123; Im:-0.030; F:10.000; w:62.832; lgw:1.798; DA:2.000; AD:0.226; M:0.113; DB:-18.938; DU:-165.600; Re:-0.109; Im:-0.028; ,求出其对应的相位角φ(w)

2023-06-11 上传

帮我分析这段abap代码:FUNCTION zhs_jcy_dmt001. *"---------------------------------------------------------------------- *"*"本地接口: *" IMPORTING *" VALUE(IM_MTART) TYPE ZHS_RANGE_MTART OPTIONAL *" VALUE(IM_MATKL) TYPE ZHS_RANGE_MATKL OPTIONAL *" VALUE(IM_SENDMSG) TYPE FLAG DEFAULT SPACE *" TABLES *" ET_DATA STRUCTURE ZHS_JCY_DTM001 OPTIONAL *"---------------------------------------------------------------------- INCLUDE zgen_bc_x_fmlog_first_phase. WAIT UP TO 3 SECONDS. INCLUDE zgen_bc_x_fmlog_last_phase. EXIT. DATA: lo_jcy TYPE REF TO zcl_hans_jcy_handle, lt_dtm001 TYPE TABLE OF zhs_jcy_dtm001, ls_dtm001 TYPE zhs_jcy_dtm001, lt_dtmc01 TYPE TABLE OF zhs_jcy_dmt01, ls_dtmc01 TYPE zhs_jcy_dmt01. "实例化类 CREATE OBJECT lo_jcy EXPORTING im_hs_tcode = gc_hs_tcode_dtm001. "判断监控点是否启用 IF lo_jcy->is_active( ) EQ zcl_hans_jcy_handle=>no. RETURN. ENDIF. PERFORM frm_get_dmtc01. REFRESH:lt_dtm001. SELECT a~mtart a~matnr b~maktx a~matkl INTO CORRESPONDING FIELDS OF TABLE lt_dtm001 FROM mara AS a INNER JOIN makt AS b ON a~matnr EQ b~matnr AND b~spras EQ sy-langu WHERE mtart IN im_mtart AND matkl IN im_matkl. DATA: l_char TYPE c, l_num TYPE n, l_len TYPE i, l_cnt TYPE i. LOOP AT lt_dtm001 INTO ls_dtm001. CLEAR l_cnt. LOOP AT gt_dtmc01 INTO gs_dtmc01 WHERE mtart EQ ls_dtm001-mtart AND zmatcode NE space. CLEAR:l_char,l_len. CONDENSE: gs_dtmc01-zmatcode. l_len = strlen( gs_dtmc01-zmatcode ). DO l_len TIMES. l_char = gs_dtmc01-zmatcode+l_cnt(1). ENDDO. ENDLOOP. ENDLOOP. CHECK lt_dtm001[] IS NOT INITIAL. ls_dtm001-statm = gc_mat_statm_k. MODIFY lt_dtm001 FROM ls_dtm001 TRANSPORTING statm WHERE statm NE gc_mat_statm_k. et_data[] = lt_dtm001[]. FREE:lt_dtm001. CHECK im_sendmsg EQ 'X'. REFRESH:gt_zhs_jcy_ab_data. CLEAR: gs_return. LOOP AT et_data INTO ls_dtm001. "设置WS参数值 CLEAR gs_zhs_jcy_ab_data. * KEY值 gs_zhs_jcy_ab_data-key03 = ls_dtm001-statm. gs_zhs_jcy_ab_data-key02 = ls_dtm001-mtart. gs_zhs_jcy_ab_data-key01 = ls_dtm001-matnr. "栏位值 gs_zhs_jcy_ab_data-field01 = ls_dtm001-mtart. gs_zhs_jcy_ab_data-field02 = ls_dtm001-matnr. gs_zhs_jcy_ab_data-field03 = ls_dtm001-maktx. gs_zhs_jcy_ab_data-field04 = ls_dtm001-zmatcode. gs_zhs_jcy_ab_data-field05 = ls_dtm001-matkl. gs_zhs_jcy_ab_data-field06 = ls_dtm001-statm. APPEND gs_zhs_jcy_ab_data TO gt_zhs_jcy_ab_data. ENDLOOP. CALL METHOD lo_jcy->call_ws_monitor EXPORTING im_zhs_jcy_ab_data = gt_zhs_jcy_ab_data IMPORTING ex_return = gs_return. FREE lo_jcy. ENDFUNCTION.

2023-07-12 上传