Centos安装ApacheHadoop2.7.7准备文件:hadoop-2.7.7.tar.gz一、安装JDK安装Hadoop之前需要保证JDK8成功安装java-version二、上传Hadoop压缩包上传成功后解压文件:tar-zxvfhadoop-2.7.7.tar.gz假设解压后的Hadoop目录为:/home/hadoop/hadoop-2.7.7注意配置HADOOP_HOME环境变量exportHADOOP_HOME=/home/hadoop/hadoop-2.7.7exportPATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin三、配置服务器免密登录$ssh-keygen-trsa-P''-f~/.ssh/id_rsa$cat~/.ssh/id_rsa.pub>>~/.ssh/authorized_keys$chmod0600~/.ssh/authorized_keys执行完成后:sshmaster命令则能够跳过输入密码阶段直接连接四、修改配置==配置文件所在位置:$HADOOP_HOME/etc/hadoop==core-size.xml<configuration><property><name>fs.defaultFS</name><value>hdfs://master:9000</value></property></configuration>hdfs-size.xml<configuration><property><name>dfs.replication</name><value>1</value></property></configuration>mapred-site.xml<configuration><property><name>mapreduce.framework.name</name><value>yarn</value></property><property><name>mapreduce.application.classpath</name><value>$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*:$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*</value></property></configuration>yarn-site.xml<configuration><property><name>yarn.nodemanager.aux-services</name><value>mapreduce_shuffle</value></property><property><name>yarn.nodemanager.env-whitelist</name><value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value></property></configuration>五、启动初始化HDFShdfsnamenode-format启动HDFSstart-dfs.sh启动YARNstart-yarn.sh启动成功后访问http://master:50070查看HDFS状态六、相关命令start-dfs.sh启动HDFS(namenode/datanode/SecondaryNamenode)stop-dfs.sh停止HDFSstart-yarn.sh启动Yarnstop-yarn.sh停止Yarnstart-all.sh启动HDFS和Yarnstop-all.sh停止HDFS和Yarn
Linux离线安装Apache-2.41.系统环境信息系统版本:Linux2.6.32-696.el6.x86_64操作系统:Centos6.92.前置准备Apache-2.4编译安装依赖apr、apr-util、pcre,所以安装前需要先下载好四个离线安装包,安装包下载地址:apr-1.5.2apr-util-1.5.4pcre-8.42httpd-2.4.343.编译安装aprcd/home/softwaretar-zxvfapr-1.5.2.tar.gzcdapr-1.5.2./configure--prefix=/usr/local/apr-1.5.2make&&makeinstall4.编译安装apr-utilcd/home/softwaretar-zxvfapr-util-1.5.4.tar.gzcdapr-util-1.5.4./configure--prefix=/usr/local/apr-util-1.5.4--with-apr=/usr/local/apr-1.5.2make&&makeinstall5.编译安装pcrecd/home/softwaretar-zxvfpcre-8.42.tar.gzcdpcre-8.42./configure--prefix=/usr/local/pcre-8.42make&&makeinstall6.编译安装httpdcd/home/softwaretar-zxvfhttpd-2.4.34.tar.gzcdhttpd-2.4.34./configure--prefix=/usr/local/httpd-2.4.34--with-apr=/usr/local/apr-1.5.2--with-apr-util=/usr/local/apr-util-1.5.4--with-pcre=/usr/local/pcre-8.42make&&makeinstall7.配置httpd.confapache编译安装完成后,配置文件地址在/usr/local/apache-2.4.34/conf/httpd.conf修改启动端口为8080Listen80818.启动Apache创建软链接:ln-s/usr/local/apache-2.4.34/bin/apachectl/usr/bin/apachectl启动:/usr/bin/apachectl
下载与ES对应的版本:官网地址解压修改$KIBANA_HOME/config/kibana.yml文件启动Kibana:sudo$KIBANA_HOME/bin/kibana浏览器输入host:5601能正常打开页面即可KAAE插件安装KAAE为Kibana的插件,主要用来监控和报警,用户可以根据需求配置相应的监控条件,达到某个条件会发出报警消息,同时KAAE也提供有报告Report功能,能够将查询到的结果生成图表发送到指定邮箱。安装:$KIBANA_HOME/bin/kibana-pulgininstallhttps://github.com/sirensolutions/sentinl/releases/download/tag-6.2.3-3/sentinl-v6.2.4.zip配置kibana.yml文件,在最后加上:重启Kibana后,浏览器输入:http://ip:5601出现以下界面说明插件安装成功可以在页面上按照需求配置监听报警
汇总节点安装Logstash。Logstash运行需要JDK环境,所以需要首先配置相应JAVA_HOME环境变量。下载与filebeat对应版本压缩包:官网地址根据操作系统选择对应的版本下载解压测试:与Filebeat配置连接,新建beat-logstash.conf:指定配置文件启动logstash(cd$LOGSTASH_HOME):bin/logstash-fconfig/beat-logstash.conf后台启动使用nohupnohup./bin/logstash-fconfig/beat-logstash.conf--config.reload.automatic>/dev/null2>&1&
1.验证码工具类1.新建包utils2.新建VerifyCodeUtil类packagecn.coralcloud.ims.utils;importjavax.imageio.ImageIO;importjava.awt.*;importjava.awt.geom.AffineTransform;importjava.awt.image.BufferedImage;importjava.io.File;importjava.io.FileOutputStream;importjava.io.IOException;importjava.io.OutputStream;importjava.util.Arrays;importjava.util.Random;/***@authorc-geff*/publicclassVerifyCodeUtil{/***使用到Algerian字体,系统里没有的话需要安装字体,字体只显示大写,去掉了1,0,i,o几个容易混淆的字符*/privatestaticfinalStringVERIFY_CODES="23456789ABCDEFGHJKLMNPQRSTUVWXYZ";privatestaticRandomrandom=newRandom();/***使用系统默认字符源生成验证码*@paramverifySize验证码长度*@return*/publicstaticStringgenerateVerifyCode(intverifySize){returngenerateVerifyCode(verifySize,VERIFY_CODES);}/***使用指定源生成验证码*@paramverifySize验证码长度*@paramsources验证码字符源*@return*/publicstaticStringgenerateVerifyCode(intverifySize,Stringsources){if(sources==null||sources.length()==0){sources=VERIFY_CODES;}intcodesLen=sources.length();Randomrand=newRandom(System.currentTimeMillis());StringBuilderverifyCode=newStringBuilder(verifySize);for(inti=0;i<verifySize;i++){verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));}returnverifyCode.toString();}/***生成随机验证码文件,并返回验证码值*@paramw*@paramh*@paramoutputFile*@paramverifySize*@return*@throwsIOException*/publicstaticStringoutputVerifyImage(intw,inth,FileoutputFile,intverifySize)throwsIOException{StringverifyCode=generateVerifyCode(verifySize);outputImage(w,h,outputFile,verifyCode);returnverifyCode;}/***输出随机验证码图片流,并返回验证码值*@paramw*@paramh*@paramos*@paramverifySize*@return*@throwsIOException*/publicstaticStringoutputVerifyImage(intw,inth,OutputStreamos,intverifySize)throwsIOException{StringverifyCode=generateVerifyCode(verifySize);outputImage(w,h,os,verifyCode);returnverifyCode;}/***生成指定验证码图像文件*@paramw*@paramh*@paramoutputFile*@paramcode*@throwsIOException*/publicstaticvoidoutputImage(intw,inth,FileoutputFile,Stringcode)throwsIOException{if(outputFile==null){return;}Filedir=outputFile.getParentFile();if(!dir.exists()){dir.mkdirs();}try{outputFile.createNewFile();FileOutputStreamfos=newFileOutputStream(outputFile);outputImage(w,h,fos,code);fos.close();}catch(IOExceptione){throwe;}}/***输出指定验证码图片流*@paramw*@paramh*@paramos*@paramcode*@throwsIOException*/publicstaticvoidoutputImage(intw,inth,OutputStreamos,Stringcode)throwsIOException{intverifySize=code.length();BufferedImageimage=newBufferedImage(w,h,BufferedImage.TYPE_INT_RGB);Randomrand=newRandom();Graphics2Dg2=image.createGraphics();g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);Color[]colors=newColor[5];Color[]colorSpaces=newColor[]{Color.WHITE,Color.CYAN,Color.GRAY,Color.LIGHT_GRAY,Color.MAGENTA,Color.ORANGE,Color.PINK,Color.YELLOW};float[]fractions=newfloat[colors.length];for(inti=0;i<colors.length;i++){colors[i]=colorSpaces[rand.nextInt(colorSpaces.length)];fractions[i]=rand.nextFloat();}Arrays.sort(fractions);//设置边框色g2.setColor(Color.GRAY);g2.fillRect(0,0,w,h);Colorc=getRandColor(200,250);//设置背景色g2.setColor(c);g2.fillRect(0,2,w,h-4);//绘制干扰线Randomrandom=newRandom();//设置线条的颜色g2.setColor(getRandColor(160,200));intloop=20;for(inti=0;i<loop;i++){intx=random.nextInt(w-1);inty=random.nextInt(h-1);intxl=random.nextInt(6)+1;intyl=random.nextInt(12)+1;g2.drawLine(x,y,x+xl+40,y+yl+20);}//添加噪点//噪声率floatyawpRate=0.05f;intarea=(int)(yawpRate*w*h);for(inti=0;i<area;i++){intx=random.nextInt(w);inty=random.nextInt(h);intrgb=getRandomIntColor();image.setRGB(x,y,rgb);}//使图片扭曲shear(g2,w,h,c);g2.setColor(getRandColor(100,160));intfontSize=h-4;Fontfont=newFont("Algerian",Font.ITALIC,fontSize);g2.setFont(font);char[]chars=code.toCharArray();for(inti=0;i<verifySize;i++){AffineTransformaffine=newAffineTransform();affine.setToRotation(Math.PI/4*rand.nextDouble()*(rand.nextBoolean()?1:-1),(w/verifySize)*i+fontSize/2,h/2);g2.setTransform(affine);g2.drawChars(chars,i,1,((w-10)/verifySize)*i+5,h/2+fontSize/2-10);}g2.dispose();ImageIO.write(image,"jpg",os);}privatestaticfinalIntegerCOLOR_MAX_INT=255;privatestaticColorgetRandColor(intfc,intbc){if(fc>COLOR_MAX_INT){fc=COLOR_MAX_INT;}if(bc>COLOR_MAX_INT){bc=COLOR_MAX_INT;}intr=fc+random.nextInt(bc-fc);intg=fc+random.nextInt(bc-fc);intb=fc+random.nextInt(bc-fc);returnnewColor(r,g,b);}privatestaticintgetRandomIntColor(){int[]rgb=getRandomRgb();intcolor=0;for(intc:rgb){color=color<<8;color=color|c;}returncolor;}privatestaticint[]getRandomRgb(){int[]rgb=newint[3];intloop=3;for(inti=0;i<loop;i++){rgb[i]=random.nextInt(255);}returnrgb;}privatestaticvoidshear(Graphicsg,intw1,inth1,Colorcolor){shearx(g,w1,h1,color);sheary(g,w1,h1,color);}privatestaticvoidshearx(Graphicsg,intw1,inth1,Colorcolor){intperiod=random.nextInt(2);booleanborderGap=true;intframes=1;intphase=random.nextInt(2);for(inti=0;i<h1;i++){doubled=(double)(period>>1)*Math.sin((double)i/(double)period+(6.2831853071795862D*(double)phase)/(double)frames);g.copyArea(0,i,w1,1,(int)d,0);if(borderGap){g.setColor(color);g.drawLine((int)d,i,0,i);g.drawLine((int)d+w1,i,w1,i);}}}privatestaticvoidsheary(Graphicsg,intw1,inth1,Colorcolor){intperiod=random.nextInt(40)+10;booleanborderGap=true;intframes=20;intphase=7;for(inti=0;i<w1;i++){doubled=(double)(period>>1)*Math.sin((double)i/(double)period+(6.2831853071795862D*(double)phase)/(double)frames);g.copyArea(i,0,1,h1,0,(int)d);if(borderGap){g.setColor(color);g.drawLine(i,(int)d,i,0);g.drawLine(i,(int)d+h1,i,h1);}}}}2.UserController新增验证码接口2.1新增captcha方法@GetMapping("/captcha")publicvoidcaptcha(HttpServletResponseresponse,HttpSessionsession){Stringcode=VerifyCodeUtil.generateVerifyCode(4);session.setAttribute(SessionKey.ADMIN_CAPTCHA_KEY,code);try{VerifyCodeUtil.outputImage(150,50,response.getOutputStream(),code);}catch(IOExceptione){e.printStackTrace();}}2.2修改login方法,增加验证下方为最终的登录验证方法:@PostMapping("/login")publicModelAndViewlogin(Stringemail,Stringpassword,Stringcaptcha,HttpSessionsession){StringsessionCaptcha=(String)session.getAttribute(SessionKey.ADMIN_CAPTCHA_KEY);ModelAndViewview=newModelAndView();view.setViewName("user/login");//将email和password写回到页面,使得登录失败时输入的账号密码不会丢失view.addObject("email",email);view.addObject("password",password);if(StringUtils.isEmpty(captcha)||!Objects.equals(captcha,sessionCaptcha)){view.addObject("errmsg","验证码错误!");returnview;}Useruser=userService.login(email,password);if(user!=null){session.setAttribute(SessionKey.ADMIN_USER_KEY,user);view.setViewName("redirect:/index");returnview;}view.addObject("errmsg","用户名或密码错误!");returnview;}注:此处将Session的Key值通过一个常量类SessionKey保存2.3SessionKey类在utils包下新建SessionKey类packagecn.coralcloud.ims.utils;/***@authorc-geff*@nameSessionKey*@description*@date2020-11-0410:12*/publicclassSessionKey{publicstaticfinalStringADMIN_USER_KEY="AdminUserKey";publicstaticfinalStringADMIN_CAPTCHA_KEY="AdminLoginCaptchaCode";}3.修改login.ftl3.1引入jquery下载jqeury文件jquery.min.js在/static/js文件夹下新建jquery文件夹,将jquery.min.js复制到文件夹下修改login.ftl文件,最终login.ftl内容为下:<!doctypehtml><htmllang="en"xmlns:th="http://www.thymeleaf.org"><head><metacharset="UTF-8"><metaname="viewport"content="width=device-width,user-scalable=no,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0"><metahttp-equiv="X-UA-Compatible"content="ie=edge"><linktype="text/css"rel="stylesheet"href="/static/css/main.css"><linktype="text/css"rel="stylesheet"href="/static/css/login.css"><scriptsrc="/static/js/jquery/jquery.min.js"type="application/javascript"></script><title>用户登录</title></head><body><divclass="login-container"><formaction="/user/login"method="post"><div><h3>用户登录</h3></div><divclass="ims-form-item"><labelclass="ims-form-label"for="email">登录邮箱</label><inputclass="ims-form-input"id="email"autocomplete="off"th:value="${email}"placeholder="请输入邮箱"type="text"name="email"></div><divclass="ims-form-item"><labelclass="ims-form-label"for="password">登录密码</label><inputclass="ims-form-input"id="password"autocomplete="new-password"th:value="${password}"placeholder="请输入密码"type="password"name="password"></div><divclass="ims-form-item"><labelclass="ims-form-label"for="captcha">图片验证</label><inputclass="ims-form-input"id="captcha"type="text"placeholder="请输入图片验证码"name="captcha"><imgsrc="/user/captcha"class="captcha"alt="图片验证码"></div><pclass="errormsg"th:if="${errmsg}!=null"th:text="${errmsg}"></p><div><buttontype="submit"class="ims-button">登录</button></div></form></div></body><scripttype="application/javascript">$(document).ready(function(){$('img.captcha').click(function(){$(this).attr("src","/user/captcha?_="+newDate().getTime())})})</script></html>注,login.ftl变更如下:1.head新增引入jquery.min.js2.input新增读取前面保存的email和password3.新增图片验证码输入框及图片4.新建图片点击监听事件,更换图片验证码4.修改样式login.css#captcha{width:100px;border-top-right-radius:0;border-bottom-right-radius:0;}.captcha{width:1px;flex:1;height:42px;cursor:pointer;border-top-right-radius:4px;border-bottom-right-radius:4px;}5.最终效果
1.建基础包/文件夹2.application.propertis编写application.propertis基础配置和数据库连接3.index.ftl注:在index.ftl页面可以输入感叹号!,然后按tab键一键生成HTML代码4.IndexController.java5.启动服务启动服务,后再浏览器输入http://localhost:8080,是否能成功访问:
采集节点主要安装Filebeat组件即可,Filebeat可以很简单运行在Windows/Linux操作系统上,不需要其余环境。下载Filebeat压缩包:https://www.elastic.co/downloads/past-releases/filebeat-6-2-4根据操作系统选择对应的版本下载解压修改目录下filebeat.yml文件,具体配置下图:上图为filebeat的输入端配置,指定监听文件上图为filebeat的输出端配置,指定输出到本机的Logstash中Filebeat启动(cd$FILEBEAT_HOME):./filebeat-e-cfilebeat.yml后台启动可使用nohup命令nohup./filebeat-e-cfilebeat.yml-d"publish">logs/filebeat.log2>&1&
全国建筑市场监管公共服务平台(四库一平台)接口数据解密需要爬取建筑市场公司的不良行为记录进入服务平台页面http://jzsc.mohurd.gov.cn,点击顶部的搜索,发现返回的数据是经过加密的:1.寻找返回的数据既然数据是通过这个url返回的,全局搜索url:http://jzsc.mohurd.gov.cn/api/webApi/dataservice/query/comp/list?pg=0&pgsz=15尝试全局模糊搜索/query/comp/list,开发者工具切换到sources页签,CTRL+SHIFT+F进行全局搜索,然后点击进入JS函数,再格式化后的JS文件里面再次CTRL+F搜索:返回的结果是请求url/dataservice/query/comp/list得到的,打上断点,重新点击页面上的搜索,一步一步调试js代码:调试过程就不一步一步分析了,最终定位到,感觉像我们想要的数据,进入Console打印一下t和et中data是最初我们请求http://jzsc.mohurd.gov.cn/api/webApi/dataservice/query/comp/list?pg=0&pgsz=15所返回的数据e这其中的数据正是我们想要的数据2.分析加密方式既然我们已经知道了数据的加密方式,那我们就重点分析一下这个地方其中t.data我们在第一步已经分出来了使我们第一步请求http://jzsc.mohurd.gov.cn/api/webApi/dataservice/query/comp/list?pg=0&pgsz=15得到的结果那我们重点分析p函数的处理过程,点击进入p函数,结果如下:对数据经过层层加密处理后,调用toString方法,既然加密函数已经找到,我们就可以编写JS代码了3.代码实现我们将函数p的代码复制出来,data是加密后返回的数据,我们先复制出来用一下运行一下项目报错的原因,其中u和d没有进行初始化我们寻找一下u和d,就在函数p的上方我们把u和d添加到代码中运行项目进行测试其中返回的数据,正是我们想要的结果4.Python实现到这里已经能成功使用JS解密返回的数据了,但是如果实现爬虫自动解析需要使用Python实现:Python中AES解密可以使用Crypto库实现,具体实现代码如下:defdecrypt(text):key='jo8j9wGw%6HbxfFn'vi='0123456789ABCDEF'#将请求返回的16进制数据转换为二进制数据text=binascii.a2b_hex(text)#构建解密对象cipher=AES.new(key.encode('utf8'),AES.MODE_CBC,vi.encode('utf8'))text_decrypted=cipher.decrypt(text)unpad=lambdas:s[0:-s[-1]]text_decrypted=unpad(text_decrypted)#去补位text_decrypted=text_decrypted.decode('utf8')returntext_decrypted5.最后基于Python的requests实现了简单的请求+解密代码#-*-coding:utf-8-*-importjsonimportrequestsimportbinasciifromCrypto.CipherimportAESdefdecrypt(text):key='jo8j9wGw%6HbxfFn'vi='0123456789ABCDEF'#将请求返回的16进制数据转换为二进制数据text=binascii.a2b_hex(text)#构建解密对象cipher=AES.new(key.encode('utf8'),AES.MODE_CBC,vi.encode('utf8'))text_decrypted=cipher.decrypt(text)unpad=lambdas:s[0:-s[-1]]text_decrypted=unpad(text_decrypted)#去补位text_decrypted=text_decrypted.decode('utf8')returntext_decryptedif__name__=='__main__':headers={'User-Agent':'Mozilla/5.0(WindowsNT10.0;Win64;x64)AppleWebKit/537.36(KHTML,likeGecko)Chrome/74.0.3729.108Safari/537.36'}#获取到当前搜索结果,并解密data=requests.get('http://jzsc.mohurd.gov.cn/api/webApi/dataservice/query/comp/list?pg=0&pgsz=15&total=0&complexname=',headers=headers).textres=json.loads(decrypt(data))print(res)6.注意本文参考地址:https://www.cnblogs.com/mingyangliang/p/11875925.html平台具有防爬取策略,频繁爬取会导致封IP,可以使用IP代理,或者设置爬取间隔在1.5s所爬取数据请勿用于非法用途
1.@RestController注解相当于@ResponseBody+@Controller合在一起的作用。2.如果只是使用@RestController注解Controller,则Controller中的方法无法返回jsp页面,或者html,配置的视图解析器InternalResourceViewResolver不起作用,返回的内容就是Return里的内容。3.如果需要返回到指定页面,则需要用@Controller配合视图解析器InternalResourceViewResolver才行。4.如果需要返回JSON,XML或自定义mediaType内容到页面,则需要在对应的方法上加上@ResponseBody注解。)
1.新建数据库表ims-learn.user2.Model包下新建User类注:因为之前初始化项目时添加了lombok依赖,所以model类可以不用写setter/getter,直接使用@Data注解替代3.编写UserDao接口类4.UserMapper.xml<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPEmapperPUBLIC"-//mybatis.org//DTDMapper3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mappernamespace="cn.coralcloud.ims.dao.UserDao"><resultMapid="userResultMap"type="User"><idproperty="id"column="id"/><resultproperty="createTime"column="create_time"/><resultproperty="updateTime"column="update_time"/></resultMap><selectid="login"resultMap="userResultMap">select*fromuserwhereemail=#{email}andpassword=#{password}</select></mapper>5.mybatis.xml编写mybatis基础配置,新建resources/mybatis/mybatis.xml<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPEconfigurationPUBLIC"-//mybatis.org//DTDConfig3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><settings><settingname="logImpl"value="STDOUT_LOGGING"/><settingname="lazyLoadingEnabled"value="true"/><settingname="aggressiveLazyLoading"value="false"/><settingname="lazyLoadTriggerMethods"value=""/></settings></configuration>6.UserService.java7.UserController.javapackagecn.coralcloud.ims.controller;importcn.coralcloud.ims.model.User;importcn.coralcloud.ims.service.UserService;importcom.sun.org.apache.xpath.internal.operations.Mod;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Controller;importorg.springframework.ui.Model;importorg.springframework.web.bind.annotation.GetMapping;importorg.springframework.web.bind.annotation.PostMapping;importorg.springframework.web.bind.annotation.RequestMapping;importorg.springframework.web.servlet.ModelAndView;importorg.springframework.web.servlet.View;importjavax.servlet.http.HttpSession;/***@authorc-geff*@nameUserController*@description*@date2020-11-0310:45*/@Controller@RequestMapping("/user")publicclassUserController{@AutowiredprivateUserServiceuserService;@PostMapping("/login")publicModelAndViewlogin(Stringemail,Stringpassword,HttpSessionsession){ModelAndViewview=newModelAndView();view.setViewName("user/login");Useruser=userService.login(email,password);if(user!=null){session.setAttribute("AdminUserKey",user);view.setViewName("redirect:/index");returnview;}view.addObject("errmsg","用户名或密码错误!");returnview;}@GetMapping("/login")publicStringlogin(){return"user/login";}}8.login.ftl9.IndexController改造10.index.ftl改造,展示用户登录后的用户名11.数据库添加一条用户数据,然后在/user/login页面登录测试
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