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现代经济快节奏发展以及不断完善升级的信息化技术,让传统数据信息的管理升级为软件存储,归纳,集中处理数据信息的管理方式。本在线学习与推荐系统就是在这样的大环境下诞生,其可以帮助管理者在短时间内处理完毕庞大的数据信息,使用这种软件工具可以帮助管理人员提高事务处理效率,达到事半功倍的效果。此在线学习与推荐系统利用当下成熟完善的Python技术,以及最受欢迎的RDBMS应用软件之一的Mysql数据库进行程序开发。在线学习与推荐系统有管理员,教师,学生。管理员功能有个人中心,科目管理,教师管理,学生管理,学习资源管理,学习记录管理,资源评价管理,系统管理。教师发布学习资源,审核学生学习记录,学生查看学习资源,提交资源评价,提交学习记录。在线学习与推荐系统的开发根据操作人员需要设计的界面简洁美观,在功能模块布局上跟同类型网站保持一致,程序在实现基本要求功能时,也为数据信息面临的安全问题提供了一些实用的解决方案。可以说该程序在帮助管理者高效率地处理工作事务的同时,也实现了数据信息的整体化,规范化与自动化。
当前社会各行业领域竞争压力非常大,随着当前时代的信息化,科学化发展,让社会各行业领域都争相使用新的信息技术,对行业内的各种相关数据进行科学化,规范化管理。这样的大环境让那些止步不前,不接受信息改革带来的信息技术的企业随时面临被淘汰,被取代的风险。所以当今,各个行业领域,不管是传统的教育行业,餐饮行业,还是旅游行业,医疗行业等领域都将使用新的信息技术进行信息革命,改变传统的纸质化,需要人手工处理工作事务的办公环境。软件信息技术能够覆盖社会各行业领域是时代的发展要求,各种数据以及文件真正实现电子化是信息社会发展的不可逆转的必然趋势。本在线学习与推荐系统也是紧跟科学技术的发展,运用当今一流的软件技术实现软件系统的开发,让家具销售库存管理信息完全通过管理系统实现科学化,规范化,程序化管理。从而帮助信息管理者节省事务处理的时间,降低数据处理的错误率,对于基础数据的管理水平可以起到促进作用,也从一定程度上对随意的业务管理工作进行了避免,同时,在线学习与推荐系统的数据库里面存储的各种动态信息,也为上层管理人员作出重大决策提供了大量的事实依据。总之,在线学习与推荐系统是一款可以真正提升管理者的办公效率的软件系统。
信息数据的处理完全依赖人工进行操作,会耗费大量的人工成本,特别是面对大量的数据信息时,传统人工操作不仅不能对数据的出错率进行保证,还容易出现各种信息资源的低利用率与低安全性问题。更有甚者,耽误大量的宝贵时间,尤其是对信息的更新,归纳与统计更是耗财耗力的过程。所以电子化信息管理的出现就能缓解以及改变传统人工方式面临的处境,一方面可以确保信息数据在短时间被高效处理,还能节省人力成本,另一方面可以确保信息数据的安全性,可靠性,并可以实现信息数据的快速检索与修改操作,这些优点是之前的旧操作模式无法比拟的。因此在线学习与推荐系统为数据信息的管理模式的升级与改革提供了重要的窗口。
环境需要
1.运行环境:python3.7/python3.8。
2.IDE环境:pycharm+mysql5.7;
3.数据库工具:Navicat11
4.硬件环境:windows 7/8/10 1G内存以上;或者 Mac OS;
5.数据库:MySql 5.7版本;
技术栈
后端:python+django
前端:vue+CSS+JavaScript+jQuery+elementui
使用说明
使用Navicat或者其它工具,在mysql中创建对应名称的数据库,并导入项目的sql文件;
使用PyCharm 导入项目,修改配置,运行项目;
将项目中config.ini配置文件中的数据库配置改为自己的配置,然后运行;
运行成功后,在浏览器中输入:http://localhost:8080/项目名
此在线学习与推荐系统利用当下成熟完善的Python技术,以及最受欢迎的RDBMS应用软件之一的Mysql数据库进行程序开发。在线学习与推荐系统有管理员,教师,学生。管理员功能有个人中心,科目管理,教师管理,学生管理,学习资源管理,学习记录管理,资源评价管理,系统管理。教师发布学习资源,审核学生学习记录,学生查看学习资源,提交资源评价,提交学习记录。在线学习与推荐系统的开发根据操作人员需要设计的界面简洁美观,在功能模块布局上跟同类型网站保持一致,程序在实现基本要求功能时,也为数据信息面临的安全问题提供了一些实用的解决方案
#coding:utf-8 __author__ = "ila" import base64, copy, logging, os, time, xlrd from django.http import JsonResponse from django.apps import apps from django.db.models.aggregates import Count,Sum from .models import news from util.codes import * from util.auth import Auth from util.common import Common import util.message as mes from django.db import connection import random from django.core.mail import send_mail def news_register(request): if request.method in ["POST", "GET"]: msg = {'code': normal_code, "msg": mes.normal_code} req_dict = request.session.get("req_dict") error = news.createbyreq(news, news, req_dict) if error != None: msg['code'] = crud_error_code msg['msg'] = "用户已存在,请勿重复注册!" return JsonResponse(msg) def news_login(request): if request.method in ["POST", "GET"]: msg = {'code': normal_code, "msg": mes.normal_code} req_dict = request.session.get("req_dict") datas = news.getbyparams(news, news, req_dict) if not datas: msg['code'] = password_error_code msg['msg'] = mes.password_error_code return JsonResponse(msg) try: __sfsh__= news.__sfsh__ except: __sfsh__=None if __sfsh__=='是': if datas[0].get('sfsh')=='否': msg['code']=other_code msg['msg'] = "账号已锁定,请联系管理员审核!" return JsonResponse(msg) req_dict['id'] = datas[0].get('id') return Auth.authenticate(Auth, news, req_dict) def news_logout(request): if request.method in ["POST", "GET"]: msg = { "msg": "登出成功", "code": 0 } return JsonResponse(msg) def news_resetPass(request): ''' ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code} req_dict = request.session.get("req_dict") columns= news.getallcolumn( news, news) try: __loginUserColumn__= news.__loginUserColumn__ except: __loginUserColumn__=None username=req_dict.get(list(req_dict.keys())[0]) if __loginUserColumn__: username_str=__loginUserColumn__ else: username_str=username if 'mima' in columns: password_str='mima' else: password_str='password' init_pwd = '123456' eval('''news.objects.filter({}='{}').update({}='{}')'''.format(username_str,username,password_str,init_pwd)) return JsonResponse(msg) def news_session(request): ''' ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code,"msg": mes.normal_code, "data": {}} req_dict={"id":request.session.get('params').get("id")} msg['data'] = news.getbyparams(news, news, req_dict)[0] return JsonResponse(msg) def news_default(request): if request.method in ["POST", "GET"]: msg = {"code": normal_code,"msg": mes.normal_code, "data": {}} req_dict = request.session.get("req_dict") req_dict.update({"isdefault":"是"}) data=news.getbyparams(news, news, req_dict) if len(data)>0: msg['data'] = data[0] else: msg['data'] = {} return JsonResponse(msg) def news_page(request): ''' ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data":{"currPage":1,"totalPage":1,"total":1,"pageSize":10,"list":[]}} req_dict = request.session.get("req_dict") #获取全部列名 columns= news.getallcolumn( news, news) #当前登录用户所在表 tablename = request.session.get("tablename") #authColumn=list(__authTables__.keys())[0] #authTable=__authTables__.get(authColumn) # if authTable==tablename: #params = request.session.get("params") #req_dict[authColumn]=params.get(authColumn) '''__authSeparate__此属性为真,params添加userid,后台只查询个人数据''' try: __authSeparate__=news.__authSeparate__ except: __authSeparate__=None if __authSeparate__=="是": tablename=request.session.get("tablename") if tablename!="users" and 'userid' in columns: try: req_dict['userid']=request.session.get("params").get("id") except: pass #当项目属性hasMessage为”是”,生成系统自动生成留言板的表messages,同时该表的表属性hasMessage也被设置为”是”,字段包括userid(用户id),username(用户名),content(留言内容),reply(回复) #接口page需要区分权限,普通用户查看自己的留言和回复记录,管理员查看所有的留言和回复记录 try: __hasMessage__=news.__hasMessage__ except: __hasMessage__=None if __hasMessage__=="是": tablename=request.session.get("tablename") if tablename!="users": req_dict["userid"]=request.session.get("params").get("id") # 判断当前表的表属性isAdmin,为真则是管理员表 # 当表属性isAdmin=”是”,刷出来的用户表也是管理员,即page和list可以查看所有人的考试记录(同时应用于其他表) __isAdmin__ = None allModels = apps.get_app_config('main').get_models() for m in allModels: if m.__tablename__==tablename: try: __isAdmin__ = m.__isAdmin__ except: __isAdmin__ = None break # 当前表也是有管理员权限的表 if __isAdmin__ == "是": if req_dict.get("userid"): del req_dict["userid"] else: #非管理员权限的表,判断当前表字段名是否有userid if tablename!="users" and 'news'[:7]!='discuss'and "userid" in news.getallcolumn(news,news): req_dict["userid"] = request.session.get("params").get("id") #当列属性authTable有值(某个用户表)[该列的列名必须和该用户表的登陆字段名一致],则对应的表有个隐藏属性authTable为”是”,那么该用户查看该表信息时,只能查看自己的 try: __authTables__=news.__authTables__ except: __authTables__=None if __authTables__!=None and __authTables__!={}: try: del req_dict['userid'] except: pass for authColumn,authTable in __authTables__.items(): if authTable==tablename: params = request.session.get("params") req_dict[authColumn]=params.get(authColumn) break msg['data']['list'], msg['data']['currPage'], msg['data']['totalPage'], msg['data']['total'], \ msg['data']['pageSize'] =news.page(news, news, req_dict) return JsonResponse(msg) def news_autoSort(request): ''' .智能推荐功能(表属性:[intelRecom(是/否)],新增clicktime[前端不显示该字段]字段(调用info/detail接口的时候更新),按clicktime排序查询) 主要信息列表(如商品列表,新闻列表)中使用,显示最近点击的或最新添加的5条记录就行 ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data":{"currPage":1,"totalPage":1,"total":1,"pageSize":10,"list":[]}} req_dict = request.session.get("req_dict") if "clicknum" in news.getallcolumn(news,news): req_dict['sort']='clicknum' else: req_dict['sort']='clicktime' req_dict['order']='desc' msg['data']['list'], msg['data']['currPage'], msg['data']['totalPage'], msg['data']['total'], \ msg['data']['pageSize'] = news.page(news,news, req_dict) return JsonResponse(msg) def news_list(request): ''' 前台分页 ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data":{"currPage":1,"totalPage":1,"total":1,"pageSize":10,"list":[]}} req_dict = request.session.get("req_dict") #获取全部列名 columns= news.getallcolumn( news, news) #表属性[foreEndList]前台list:和后台默认的list列表页相似,只是摆在前台,否:指没有此页,是:表示有此页(不需要登陆即可查看),前要登:表示有此页且需要登陆后才能查看 try: __foreEndList__=news.__foreEndList__ except: __foreEndList__=None if __foreEndList__=="前要登": tablename=request.session.get("tablename") if tablename!="users" and 'userid' in columns: try: req_dict['userid']=request.session.get("params").get("id") except: pass #forrEndListAuth try: __foreEndListAuth__=news.__foreEndListAuth__ except: __foreEndListAuth__=None #authSeparate try: __authSeparate__=news.__authSeparate__ except: __authSeparate__=None if __foreEndListAuth__ =="是" and __authSeparate__=="是": tablename=request.session.get("tablename") if tablename!="users": req_dict['userid']=request.session.get("params",{"id":0}).get("id") tablename = request.session.get("tablename") if tablename == "users" and req_dict.get("userid") != None:#判断是否存在userid列名 del req_dict["userid"] else: __isAdmin__ = None allModels = apps.get_app_config('main').get_models() for m in allModels: if m.__tablename__==tablename: try: __isAdmin__ = m.__isAdmin__ except: __isAdmin__ = None break if __isAdmin__ == "是": if req_dict.get("userid"): del req_dict["userid"] else: #非管理员权限的表,判断当前表字段名是否有userid if "userid" in columns: try: # 本接口可以匿名访问,所以try判断是否为匿名 req_dict['userid']=request.session.get("params").get("id") except: pass #当列属性authTable有值(某个用户表)[该列的列名必须和该用户表的登陆字段名一致],则对应的表有个隐藏属性authTable为”是”,那么该用户查看该表信息时,只能查看自己的 try: __authTables__=news.__authTables__ except: __authTables__=None if __authTables__!=None and __authTables__!={} and __foreEndListAuth__=="是": try: del req_dict['userid'] except: pass for authColumn,authTable in __authTables__.items(): if authTable==tablename: params = request.session.get("params") req_dict[authColumn]=params.get(authColumn) break if news.__tablename__[:7]=="discuss": try: del req_dict['userid'] except: pass msg['data']['list'], msg['data']['currPage'], msg['data']['totalPage'], msg['data']['total'], \ msg['data']['pageSize'] = news.page(news, news, req_dict) return JsonResponse(msg) def news_save(request): ''' 后台新增 ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data": {}} req_dict = request.session.get("req_dict") tablename=request.session.get("tablename") __isAdmin__ = None allModels = apps.get_app_config('main').get_models() for m in allModels: if m.__tablename__==tablename: try: __isAdmin__ = m.__isAdmin__ except: __isAdmin__ = None break #获取全部列名 columns= news.getallcolumn( news, news) if tablename!='users' and req_dict.get("userid")!=None and 'userid' in columns and __isAdmin__!='是': params=request.session.get("params") req_dict['userid']=params.get('id') error= news.createbyreq(news,news, req_dict) if error!=None: msg['code'] = crud_error_code msg['msg'] = error return JsonResponse(msg) def news_add(request): ''' 前台新增 ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data": {}} req_dict = request.session.get("req_dict") #获取全部列名 columns= news.getallcolumn( news, news) try: __authSeparate__=news.__authSeparate__ except: __authSeparate__=None if __authSeparate__=="是": tablename=request.session.get("tablename") if tablename!="users" and 'userid' in columns: try: req_dict['userid']=request.session.get("params").get("id") except: pass try: __foreEndListAuth__=news.__foreEndListAuth__ except: __foreEndListAuth__=None if __foreEndListAuth__ and __foreEndListAuth__!="否": tablename=request.session.get("tablename") if tablename!="users": req_dict['userid']=request.session.get("params").get("id") error= news.createbyreq(news,news, req_dict) if error!=None: msg['code'] = crud_error_code msg['msg'] = error return JsonResponse(msg) def news_thumbsup(request,id_): ''' 点赞:表属性thumbsUp[是/否],刷表新增thumbsupnum赞和crazilynum踩字段, ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data": {}} req_dict = request.session.get("req_dict") id_=int(id_) type_=int(req_dict.get("type",0)) rets=news.getbyid(news,news,id_) update_dict={ "id":id_, } if type_==1:#赞 update_dict["thumbsupnum"]=int(rets[0].get('thumbsupnum'))+1 elif type_==2:#踩 update_dict["crazilynum"]=int(rets[0].get('crazilynum'))+1 error = news.updatebyparams(news,news, update_dict) if error!=None: msg['code'] = crud_error_code msg['msg'] = error return JsonResponse(msg) def news_info(request,id_): ''' ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data": {}} data = news.getbyid(news,news, int(id_)) if len(data)>0: msg['data']=data[0] #浏览点击次数 try: __browseClick__= news.__browseClick__ except: __browseClick__=None if __browseClick__=="是" and "clicknum" in news.getallcolumn(news,news): try: clicknum=int(data[0].get("clicknum",0))+1 except: clicknum=0+1 click_dict={"id":int(id_),"clicknum":clicknum} ret=news.updatebyparams(news,news,click_dict) if ret!=None: msg['code'] = crud_error_code msg['msg'] = ret return JsonResponse(msg) def news_detail(request,id_): ''' ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data": {}} data =news.getbyid(news,news, int(id_)) if len(data)>0: msg['data']=data[0] #浏览点击次数 try: __browseClick__= news.__browseClick__ except: __browseClick__=None if __browseClick__=="是" and "clicknum" in news.getallcolumn(news,news): try: clicknum=int(data[0].get("clicknum",0))+1 except: clicknum=0+1 click_dict={"id":int(id_),"clicknum":clicknum} ret=news.updatebyparams(news,news,click_dict) if ret!=None: msg['code'] = crud_error_code msg['msg'] = retfo return JsonResponse(msg) def news_update(request): ''' ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data": {}} req_dict = request.session.get("req_dict") if req_dict.get("mima") and req_dict.get("password"): if "mima" not in news.getallcolumn(news,news) : del req_dict["mima"] if "password" not in news.getallcolumn(news,news) : del req_dict["password"] try: del req_dict["clicknum"] except: pass error = news.updatebyparams(news, news, req_dict) if error!=None: msg['code'] = crud_error_code msg['msg'] = error return JsonResponse(msg) def news_delete(request): ''' 批量删除 ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code, "data": {}} req_dict = request.session.get("req_dict") error=news.deletes(news, news, req_dict.get("ids") ) if error!=None: msg['code'] = crud_error_code msg['msg'] = error return JsonResponse(msg) def news_vote(request,id_): ''' 浏览点击次数(表属性[browseClick:是/否],点击字段(clicknum),调用info/detail接口的时候后端自动+1)、投票功能(表属性[vote:是/否],投票字段(votenum),调用vote接口后端votenum+1) 统计商品或新闻的点击次数;提供新闻的投票功能 ''' if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": mes.normal_code} data= news.getbyid(news, news, int(id_)) for i in data: votenum=i.get('votenum') if votenum!=None: params={"id":int(id_),"votenum":votenum+1} error=news.updatebyparams(news,news,params) if error!=None: msg['code'] = crud_error_code msg['msg'] = error return JsonResponse(msg) def news_importExcel(request): if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": "成功", "data": {}} excel_file = request.FILES.get("file", "") file_type = excel_file.name.split('.')[1] if file_type in ['xlsx', 'xls']: data = xlrd.open_workbook(filename=None, file_contents=excel_file.read()) table = data.sheets()[0] rows = table.nrows try: for row in range(1, rows): row_values = table.row_values(row) req_dict = {} news.createbyreq(news, news, req_dict) except: pass else: msg.code = 500 msg.msg = "文件类型错误" return JsonResponse(msg) def news_sendemail(request): if request.method in ["POST", "GET"]: req_dict = request.session.get("req_dict") code = random.sample(['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'], 4) to = [] to.append(req_dict['email']) send_mail('用户注册', '您的注册验证码是【'+''.join(code)+'】,请不要把验证码泄漏给其他人,如非本人请勿操作。', 'yclw9@qq.com', to, fail_silently = False) cursor = connection.cursor() cursor.execute("insert into emailregistercode(email,role,code) values('"+req_dict['email']+"','用户','"+''.join(code)+"')") msg = { "msg": "发送成功", "code": 0 } return JsonResponse(msg) def news_autoSort2(request): if request.method in ["POST", "GET"]: req_dict = request.session.get("req_dict") cursor = connection.cursor() cursor.execute("select goodtype from orders where userid = %d"%(request.session.get("params").get("id"))+" and tablename = 'news' order by addtime desc") rows = cursor.fetchall() leixing = set() for row in rows: for item in row: leixing.add(item) L = [] cursor.execute("select * from news where $intelRecomColumn in ('%s"%("','").join(leixing)+"') union all select * from news where $intelRecomColumn not in('%s"%("','").join(leixing)+"')") desc = cursor.description data_dict = [dict(zip([col[0] for col in desc], row)) for row in cursor.fetchall()] for online_dict in data_dict: for key in online_dict: if 'datetime.datetime' in str(type(online_dict[key])): online_dict[key] = online_dict[key].strftime( "%Y-%m-%d %H:%M:%S") else: pass L.append(online_dict) return JsonResponse({"code": 0, "msg": '', "data":{"currPage":1,"totalPage":1,"total":1,"pageSize":5,"list": L[0:5]}}) def news_value(request, xColumnName, yColumnName, timeStatType): if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": "成功", "data": {}} where = ' where 1 = 1 ' sql = '' if timeStatType == '日': sql = "SELECT DATE_FORMAT({0}, '%Y-%m-%d') {0}, sum({1}) total FROM news {2} GROUP BY DATE_FORMAT({0}, '%Y-%m-%d')".format(xColumnName, yColumnName, where, '%Y-%m-%d') if timeStatType == '月': sql = "SELECT DATE_FORMAT({0}, '%Y-%m') {0}, sum({1}) total FROM news {2} GROUP BY DATE_FORMAT({0}, '%Y-%m')".format(xColumnName, yColumnName, where, '%Y-%m') if timeStatType == '年': sql = "SELECT DATE_FORMAT({0}, '%Y') {0}, sum({1}) total FROM news {2} GROUP BY DATE_FORMAT({0}, '%Y')".format(xColumnName, yColumnName, where, '%Y') L = [] cursor = connection.cursor() cursor.execute(sql) desc = cursor.description data_dict = [dict(zip([col[0] for col in desc], row)) for row in cursor.fetchall()] for online_dict in data_dict: for key in online_dict: if 'datetime.datetime' in str(type(online_dict[key])): online_dict[key] = online_dict[key].strftime( "%Y-%m-%d %H:%M:%S") else: pass L.append(online_dict) msg['data'] = L return JsonResponse(msg) def news_o_value(request, xColumnName, yColumnName): if request.method in ["POST", "GET"]: msg = {"code": normal_code, "msg": "成功", "data": {}} where = ' where 1 = 1 ' sql = "SELECT {0}, sum({1}) AS total FROM news {2} GROUP BY {0}".format(xColumnName, yColumnName, where) L = [] cursor = connection.cursor() cursor.execute(sql) desc = cursor.description data_dict = [dict(zip([col[0] for col in desc], row)) for row in cursor.fetchall()] for online_dict in data_dict: for key in online_dict: if 'datetime.datetime' in str(type(online_dict[key])): online_dict[key] = online_dict[key].strftime( "%Y-%m-%d %H:%M:%S") else: pass L.append(online_dict) msg['data'] = L return JsonResponse(msg)
目 录 III
1 绪论 1
1.1 研究背景 1
1.2 目的和意义 1
1.3 论文结构安排 2
2 相关技术 3
2.1 B/S结构介绍 3
2.2 MYSQL数据库介绍 3
2.3 PYTHON语言 4
3 系统分析 6
3.1 系统可行性分析 6
3.1.1 技术可行性分析 6
3.1.2 经济可行性分析 6
3.1.3 运行可行性分析 6
3.2 系统性能分析 7
3.2.1 易用性指标 7
3.2.2 可扩展性指标 7
3.2.3 健壮性指标 7
3.2.4 安全性指标 8
3.3 系统流程分析 8
3.3.1 操作流程分析 8
3.3.2 登录流程分析 9
3.3.3 信息添加流程分析 10
3.3.4 信息删除流程分析 11
4 系统设计 12
4.1 系统概要设计 12
4.2 系统功能结构设计 12
4.3 数据库设计 13
4.3.1 数据库E-R图设计 13
4.3.2 数据库表结构设计 15
5 系统实现 19
5.1 学生信息管理 19
5.2 科目 19
5.3 教师管理 20
5.4 公告信息管理 21
5.5 学习资源管理 21
5.6 学习记录管理 22
6 系统测试 24
6.1 系统测试的特点 24
6.2 测试结果分析 24
结 论 26
致 谢 27
参考文献 28
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