学习笔记（狂神SpringMVC P17-P130）"/>
学习笔记（狂神SpringMVC P17-P130）
学习笔记（狂神SpringMVC P1-P16）
1、SSM整合
狂神说SpringMVC05：整合SSM框架
学习笔记源码
2、AJAX
是一种在无需重新加载整个网页的情况下，能够更新部分网页的技术。
伪造Ajax
<!DOCTYPE html>
<html>
<head lang="en"><meta charset="UTF-8"><title>kuangshen</title>
</head>
<body><script type="text/javascript">window.onload = function(){var myDate = new Date();document.getElementById('currentTime').innerText = myDate.getTime();};function LoadPage(){var targetUrl = document.getElementById('url').value;console.log(targetUrl);document.getElementById("iframePosition").src = targetUrl;}</script><div><p>请输入要加载的地址：<span id="currentTime"></span></p><p><input id="url" type="text" value="/"/><input type="button" value="提交" onclick="LoadPage()"></p>
</div><div><h3>加载页面位置：</h3><iframe id="iframePosition" style="width: 100%;height: 500px;"></iframe>
</div></body>
</html>
简单体验
- 创建一个SpringMVC的基本框架，配置好相关配置文件
- applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""xmlns:xsi=""xmlns:context=""xmlns:mvc=""xsi:schemaLocation="://www.springframework.org/schema/beans/spring-beans.xsd://www.springframework.org/schema/context/spring-context.xsd://www.springframework.org/schema/mvc/spring-mvc.xsd"><!-- 自动扫描指定的包，下面所有注解类交给IOC容器管理 --><context:component-scan base-package="controller"/><mvc:default-servlet-handler/><mvc:annotation-driven/><!-- 视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"id="internalResourceViewResolver"><!-- 前缀 --><property name="prefix" value="/WEB-INF/jsp/"/><!-- 后缀 --><property name="suffix" value=".jsp"/></bean><!--注解加载映射器、适配器，解决Json数据中文乱码问题--></beans>
- web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns=""xmlns:xsi=""xsi:schemaLocation=" .xsd"version="4.0"><!--DispatcherServlet--><servlet><servlet-name>DispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！--><param-value>classpath:applicationContext.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>DispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping><!--encodingFilter--><filter><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param></filter><filter-mapping><filter-name>encodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!--Session过期时间--><session-config><session-timeout>15</session-timeout></session-config></web-app>
- AjaxController
package controller;import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import pojo.User;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;@RestController
public class AjaxController {@RequestMapping("/a1")public void ajax1(String name, HttpServletResponse response) throws IOException {if ("admin".equals(name)) {response.getWriter().print("true");} else {response.getWriter().print("false");}}
}
- index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>$Title$</title><script src="${pageContext.request.contextPath}/statics/js/jquery-3.6.min.js"></script><script>function a1() {$.post({url: "${pageContext.request.contextPath}/a1",data: {'name': $("#uerName").val()},success: function (data, status) {alert(data);alert(status);}});}</script>
</head>
<body>
<%--onblur：失去焦点触发事件--%>
用户名:<input type="text" id="uerName" onblur="a1()"/>
</body>
</html>
启动tomcat测试！打开浏览器的控制台，当我们鼠标离开输入框的时候，可以看到发出了一个ajax的请求！是后台返回给我们的结果！测试成功！
Springmvc实现
实体类user
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {private String name;private int age;private String sex;}
Controller
@RequestMapping("/a2")public List<User> ajax2(){List<User> list = new ArrayList<User>();list.add(new User("1号",33,"男"));list.add(new User("2号",31,"女"));list.add(new User("3号",32,"男"));return list; //由于@RestController注解，将list转成json格式返回}
前端界面test.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<input type="button" id="btn" value="获取数据"/>
<table width="80%" align="center"><tr><td>姓名</td><td>年龄</td><td>性别</td></tr><tbody id="content"></tbody>
</table><script src="${pageContext.request.contextPath}/statics/js/jquery-3.6.min.js"></script><script>$(function () {$("#btn").click(function () {$.post("${pageContext.request.contextPath}/a2", function (data) {let html = "";for (let i = 0; i < data.length; i++) {html += "<tr>" +"<td>" + data[i].name + "</td>" +"<td>" + data[i].age + "</td>" +"<td>" + data[i].sex + "</td>" +"</tr>"}$("#content").html(html);});})})</script>
</body>
</html>
注册页面
Controller
@RequestMapping("/a3")
public String ajax3(String name,String pwd){String msg = "";//模拟数据库中存在数据if (name!=null){if ("admin".equals(name)){msg = "OK";}else {msg = "用户名输入错误";}}if (pwd!=null){if ("123456".equals(pwd)){msg = "OK";}else {msg = "密码输入有误";}}return msg; //由于@RestController注解，将msg转成json格式返回
}
login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>ajax</title><script src="${pageContext.request.contextPath}/statics/js/jquery-3.1.1.min.js"></script><script>function a1(){$.post({url:"${pageContext.request.contextPath}/a3",data:{'name':$("#name").val()},success:function (data) {if (data.toString()=='OK'){$("#userInfo").css("color","green");}else {$("#userInfo").css("color","red");}$("#userInfo").html(data);}});}function a2(){$.post({url:"${pageContext.request.contextPath}/a3",data:{'pwd':$("#pwd").val()},success:function (data) {if (data.toString()=='OK'){$("#pwdInfo").css("color","green");}else {$("#pwdInfo").css("color","red");}$("#pwdInfo").html(data);}});}</script>
</head>
<body>
<p>用户名:<input type="text" id="name" onblur="a1()"/><span id="userInfo"></span>
</p>
<p>密码:<input type="text" id="pwd" onblur="a2()"/><span id="pwdInfo"></span>
</p>
</body>
</html>
3、拦截器
体验拦截器
新建一个SpringMVC的空项目。
编写MyInterceptor
package interceptor;import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class MyInterceptor implements HandlerInterceptor {//在请求处理的方法之前执行//如果返回true执行下一个拦截器//如果返回false就不执行下一个拦截器public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {System.out.println("------------处理前------------");return true;}//在请求处理方法执行之后执行public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {System.out.println("------------处理后------------");}//在dispatcherServlet处理后执行,做清理工作.public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {System.out.println("------------清理------------");}
}
配置applicationContext.xml
<!–关于拦截器的配置–><mvc:interceptors><mvc:interceptor><!–/** 包括路径及其子路径–><!–/admin/* 拦截的是/admin/add等等这种 , /admin/add/user不会被拦截–><!–/admin/** 拦截的是/admin/下的所有–><mvc:mapping path="/**"/><!–bean配置的就是拦截器–><bean class="interceptor.MyInterceptor"/></mvc:interceptor></mvc:interceptors>
编写一个Controller
package controller;import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;import javax.servlet.http.HttpSession;@Controller
@RequestMapping("/user")
public class LoginController {@RequestMapping("/main")public String main() {return "main";}@RequestMapping("/goLogin")public String login() {return "login";}@RequestMapping("/login")public String login(HttpSession session, String username, String password, Model model) {//把用户的信息存在session中session.setAttribute("userLoginInfo", username);model.addAttribute("password", password);model.addAttribute("username", username);return "main";}@RequestMapping("/goOut")public String goOut(HttpSession session) {session.removeAttribute("userLoginInfo");return "login";}
}前端 index.jsp
<a href="${pageContext.request.contextPath}/interceptor">拦截器测试</a>
验证用户是否登录 (认证用户)
login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>登录</title>
</head>
<body>
<%--在web-inf下面的所有页面或者资源，只能通过controller或者Servlet进行访问--%>
<h1>登录页面</h1><form action="${pageContext.request.contextPath}/user/login" method="post">用户名：<input type="text" name="username">密码：<input type="text" name="password"><input type="submit" value="提交">
</form>
</body>
</html>编写一个Controller
@Controller
@RequestMapping("/user")
public class LoginController {@RequestMapping("/main")public String main() {return "main";}@RequestMapping("/goLogin")public String login() {return "login";}@RequestMapping("/login")public String login(HttpSession session, String username, String password, Model model) {//把用户的信息存在session中session.setAttribute("userLoginInfo",username);model.addAttribute("password",password);model.addAttribute("username",username);return "main";}@RequestMapping("/goOut")public String goOut(HttpSession sessionl) {sessionl.removeAttribute("userLoginInfo");return "login";}
}main.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>首页</title>
</head>
<body>
<h1>首页</h1>
<span>${password}</span>
<span>${username}</span><p><a href="${pageContext.request.contextPath}/user/goOut">注销</a>
</p></body>
</html>index
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>index</title>
</head>
<body>
<h1><a href="${pageContext.request.contextPath}/user/goLogin">登录页面</a></h1>
<h1><a href="${pageContext.request.contextPath}/user/main">首页</a></h1></body>
</html>编写用户登录拦截器
package interceptor;import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;public class LoginInterceptor implements HandlerInterceptor {public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {HttpSession session = request.getSession();//放行:判断什么情况下登录//登录页面也会放行if (request.getRequestURI().contains("goLogin")) {return true;}if (request.getRequestURI().contains("login")) {return true;}if (session.getAttribute("userLoginInfo") != null) {return true;}//判断什么情况下没有登录request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request,response);return false;}
}Springmvc的配置文件中注册拦截器
<!--关于拦截器的配置-->
<mvc:interceptors><mvc:interceptor><mvc:mapping path="/**"/><bean id="loginInterceptor" class="com.kuang.interceptor.LoginInterceptor"/></mvc:interceptor>
</mvc:interceptors>4、文件上传下载
文件下载
创建一个空白的SpringMVC框架
配置spring的xml文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""xmlns:xsi=""xmlns:context=""xmlns:mvc=""xsi:schemaLocation="://www.springframework.org/schema/beans/spring-beans.xsd://www.springframework.org/schema/context/spring-context.xsd://www.springframework.org/schema/mvc/spring-mvc.xsd"><!-- 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 --><context:component-scan base-package="controller"/><!-- 让Spring MVC不处理静态资源 --><mvc:default-servlet-handler/><!--支持mvc注解驱动在spring中一般采用@RequestMapping注解来完成映射关系要想使@RequestMapping注解生效必须向上下文中注册DefaultAnnotationHandlerMapping和一个AnnotationMethodHandlerAdapter实例这两个实例分别在类级别和方法级别处理。而annotation-driven配置帮助我们自动完成上述两个实例的注入。--><mvc:annotation-driven/><!--视图解析器:DispatcherServlet给他的ModelAndView--><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"><!--前缀--><property name="prefix" value="/WEB-INF/jsp/"/><!--后缀--><property name="suffix" value=".jsp"/></bean><!--文件上传配置--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 --><property name="defaultEncoding" value="utf-8"/><!-- 上传文件大小上限，单位为字节（10485760=10M） --><property name="maxUploadSize" value="10485760"/><property name="maxInMemorySize" value="40960"/></bean></beans>
配置web.xml
<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"".dtd" ><web-app><display-name>Archetype Created Web Application</display-name><!--1.注册servlet--><servlet><servlet-name>SpringMVC</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--通过初始化参数指定SpringMVC配置文件的位置，进行关联--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc-servlet.xml</param-value></init-param><!-- 启动顺序，数字越小，启动越早 --><load-on-startup>1</load-on-startup></servlet><!--所有请求都会被springmvc拦截 --><servlet-mapping><servlet-name>SpringMVC</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>再webapp下面创建静态资源如
编写FileController
@RequestMapping(value="/download")public String downloads(HttpServletResponse response , HttpServletRequest request) throws Exception{//要下载的图片地址String path = request.getServletContext().getRealPath("/static");String fileName = "12.txt";//1、设置response 响应头response.reset(); //设置页面不缓存,清空bufferresponse.setCharacterEncoding("UTF-8"); //字符编码response.setContentType("multipart/form-data"); //二进制传输数据//设置响应头response.setHeader("Content-Disposition","attachment;fileName="+ URLEncoder.encode(fileName, "UTF-8"));File file = new File(path,fileName);//2、 读取文件--输入流InputStream input=new FileInputStream(file);//3、 写出文件--输出流OutputStream out = response.getOutputStream();byte[] buff =new byte[1024];int index=0;//4、执行 写出操作while((index= input.read(buff))!= -1){out.write(buff, 0, index);out.flush();}out.close();input.close();return null;}
启动Tomcat测试localhost:8080/download
文件上传
导入依赖
<!--文件上传-->
<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.3</version>
</dependency>
<!--servlet-api导入高版本的-->
<dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version>
</dependency>
配置Spring配置文件
<!--文件上传配置-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 --><property name="defaultEncoding" value="utf-8"/><!-- 上传文件大小上限，单位为字节（10485760=10M） --><property name="maxUploadSize" value="10485760"/><property name="maxInMemorySize" value="40960"/>
</bean>
前端页面
<form action="/upload" enctype="multipart/form-data" method="post"><input type="file" name="file"/><input type="submit" value="upload">
</form>
编写Controller
package controller;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.commons.CommonsMultipartFile;import javax.servlet.http.HttpServletRequest;
import java.io.*;@Controller
public class FileController {//@RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象//批量上传CommonsMultipartFile则为数组即可@RequestMapping("/upload")public String fileUpload(@RequestParam("file") CommonsMultipartFile file , HttpServletRequest request) throws IOException {//获取文件名 : file.getOriginalFilename();String uploadFileName = file.getOriginalFilename();//如果文件名为空，直接回到首页！if ("".equals(uploadFileName)){return "redirect:/index.jsp";}System.out.println("上传文件名 : "+uploadFileName);//上传路径保存设置String path = request.getServletContext().getRealPath("/upload");//如果路径不存在，创建一个File realPath = new File(path);if (!realPath.exists()){realPath.mkdir();}System.out.println("上传文件保存地址："+realPath);InputStream is = file.getInputStream(); //文件输入流OutputStream os = new FileOutputStream(new File(realPath,uploadFileName)); //文件输出流//读取写出int len=0;byte[] buffer = new byte[1024];while ((len=is.read(buffer))!=-1){os.write(buffer,0,len);os.flush();}os.close();is.close();return "redirect:/index.jsp";}
}
Controller
/** 采用file.Transto 来保存上传的文件*/
@RequestMapping("/upload2")
public String fileUpload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {//上传路径保存设置String path = request.getServletContext().getRealPath("/upload");File realPath = new File(path);if (!realPath.exists()){realPath.mkdir();}//上传文件地址System.out.println("上传文件保存地址："+realPath);//通过CommonsMultipartFile的方法直接写文件（注意这个时候）file.transferTo(new File(realPath +"/"+ file.getOriginalFilename()));return "redirect:/index.jsp";
}
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学习笔记（狂神SpringMVC P17-P130）
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