原创 2017-12-21 zhuyuansj zhuyuansj
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快速熟悉springmvc的方法
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作者:zhuyuansj
连接:http://www.jianshu.com/p/9eec63121cef
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1
前言
由于最近半年一直在用springboot,但是也不能忘了本,于是把springmvc重新练了下,做了个前端传个表单,后台接收并显示的界面,该项目可以上传视频的URL,然后前端进行页面的播放,项目采用springmvc+spring+mybatis,前端是用jquery.功能很简单,前端一个form表单,提交后台,后台添加数据,并且将数据转发到前端进行显示。后台将entity,service,serviceimpl,controller,全部用marven进行关联,分模块开发。
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项目中几个重要知识点
1.文件上传 2.2张表在不关联的情况下,用inner join连表查询 3.分页查询 4.log日志使用 5.模块之间的联系,思想概述
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项目的结构
(一):首先在resources目录下新建springmvc.xml,在里面加入
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>添加视频资源</title> </head> <body> <center> <h1>视频后台添加视频资源</h1> <form action="addVideo" style="font-size: 14px;" method="post" ENCTYPE="multipart/form-data"> <table> <tr> <td>视频名称:</td> <td><input type="text" name=videoName></td> </tr> <tr> <td>视频类型:</td> <td><select name="videoTypeId" style="width: 170px;"> <c:forEach items="${listVideoType}" var="p"> <option value="${p.id}">${p.typeName}</option> </c:forEach> </select></td> </tr> <tr> <td>优酷播放URL:</td> <td><textarea rows="10" cols="30" name="videoHtml"></textarea></td> </tr> <tr> <td>上传封面:</td> <td><input type="file" name="file"></td> </tr> <tr> <td colspan="2"><input type="submit" value="提交"></td></tr> </table> </form> </center> </body> </html> |
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后台上传文件接口
@RequestMapping("/addVideo") public String addVideo(@RequestParam(value = "file", required = false) MultipartFile file, VideoInfo videoInfo, HttpServletRequest req, HttpServletResponse res) {//这里的required=false,意思是不传参也可以 try { // 获取当前上下文 String path = req.getSession().getServletContext().getRealPath("/static/imgs"); // 文件名称 String newName = System.currentTimeMillis() + ".png"; File targetFile = new File(path, newName); // 文件夹不存在,则创建文件夹 if (!targetFile.exists()) { targetFile.mkdirs(); } // 保存 try { file.transferTo(targetFile); } catch (Exception e) { log.error(e); } videoInfo.setVideoUrl(newName); videoInfoService.addVideoInfo(videoInfo); req.setAttribute("result", "封面上传成功!"); return "redirect:/videoManag"; } catch (Exception e) { log.error(e); req.setAttribute("result", "上传失败!"); return LOCAVIDEO; } } |
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select a.id as id,a.video_name as videoName, a.video_html as videoHtml ,a.video_url as videoUrl, a.video_del as videoDel , b.type_name as typeName from video_info as a inner join video_type as b on a.video_type_id=b.id; |
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在resource目录下新建mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 配置分页插件 --> <plugins> <plugin interceptor="com.github.pagehelper.PageHelper"> <!-- 设置数据库类型 Oracle,Mysql,MariaDB,SQLite,Hsqldb,PostgreSQL六种数据库--> <property name="dialect" value="mysql"/> </plugin> </plugins> </configuration> |
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applicationContext-dao.xml加载mybatis-config.xml
<!-- spring和MyBatis完美整合,不需要mybatis的配置映射文件 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- 自动扫描mapping.xml文件 --> <property name="mapperLocations" value="classpath:mappings/*.xml"></property> <property name="configLocation" value="classpath:spring/mybatis-config.xml" /> </bean> |
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java代码使用
@RequestMapping("/indexVideo") public String indexVideo(HttpServletRequest request, int pageIndex) { Page page = PageHelper.startPage(pageIndex, 2); request.setAttribute("listVideo", videoInfoService.getVoideAll(null)); request.setAttribute("pageSize", page.getPages()); return INDEXVIDEO; } |
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前端代码
<a style="font-size: 20px;" href="indexVideo?pageIndex=1">首页</a> <c:forEach begin="1" end="${pageSize}" var="p"> <a style="font-size: 20px;" href="indexVideo?pageIndex=${p}">${p}</a> </c:forEach> <a style="font-size: 20px;" href="indexVideo?pageIndex=${pageSize}">尾页</a> |
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创建log4j.properties,在resources/properties下创建log4j.properties文件
### set log levels ### log4j.rootLogger =INFO,DEBUG, stdout , R log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n log4j.appender.D = org.apache.log4j.DailyRollingFileAppender log4j.appender.D.File = E://logs/log.log log4j.appender.D.Append = true log4j.appender.D.Threshold = DEBUG log4j.appender.D.layout = org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n log4j.appender.E = org.apache.log4j.DailyRollingFileAppender log4j.appender.E.File =E://logs/error.log log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n |
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web.xml加载 log4j.properties
<!--设置log4j的配置文件位置 --> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/classes/properties/log4j.properties</param-value> </context-param> <!--使用监听加载log4j的配置文件 --> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> |
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private static Logger log = Logger.getLogger(TestController.class);
前后端一体的springmvc,我们以前都会搭建在一个项目,这次把entity,dao,service,serviceimpl,controller分成了模块进行开发,每个模块用marven进行关联。这样做的好处就是代码整洁清晰,每个层面都是个小的项目,适合分模块进行开发。
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大功告成