SpringMVC扩展部分
SpringMVC扩展部分
springMVC拦截器
基础配置文件
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>springMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encoding</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>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://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="com.control"/>
<!-- 让Spring MVC不处理静态资源 -->
<mvc:default-servlet-handler/>
<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8"/>
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="failOnEmptyBeans" value="false"/>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<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>
<!-- 拦截器配置-->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.config.loginInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
</beans>
要想自定义拦截器，必须实现HandlerInterceptor接口
public class loginInterceptor implements HandlerInterceptor {
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
HttpSession session = request.getSession();
if (session.getAttribute("userLoginInfo") != null | request.getRequestURI().toLowerCase().contains("login")) {
return true;
}
response.sendRedirect("/toLogin");
// request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request,response);
return false;
}
// 拦截日志
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("after solver");
}
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("clear work");
}
}
实现登陆拦截
Controller层
@Controller
public class loginController {
@RequestMapping("/login")
public String login(HttpSession session, String username, String password, Model model){
session.setAttribute("userLoginInfo",username);
model.addAttribute("username",username);
return "main";
}
@RequestMapping("/loginOut")
public String loginOut(HttpSession session){
session.removeAttribute("userLoginInfo");
return "redirect:/index.jsp";
}
@RequestMapping("/toMain")
public String toMain(HttpSession session,Model model){
String username = session.getAttribute("userLoginInfo").toString();
if(!username.equals("null")){
model.addAttribute("username",username);
}
return "main";
}
@RequestMapping("/toLogin")
public String toLogin(){
return "login";
}
}
前端
<!--index.jsp body -->
<a href="${pageContext.request.contextPath}/toLogin">登陆页面</a>
<a href="${pageContext.request.contextPath}/toMain">主页面</a>
<!-- login.jsp body-->
<h1>登陆页面</h1>
<form action="${pageContext.request.contextPath}/login" method="post">
用户名:<input type="text" name="username">
密码:<input type="text" name="password">
<input type="submit" value="提交">
</form>
<!--main.jsp body -->
<h1>首页</h1>
<span>${username}</span>
<p>
<a href="${pageContext.request.contextPath}/loginOut">注销</a>
</p>
文件上传下载
@RestController
public class fileController {
@RequestMapping("/upload")
public String upload(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {
String uploadFileName = file.getOriginalFilename();
if ("".equals(uploadFileName)) {
return "redirect:/index.jsp";
}
System.out.println("upload fileName" + uploadFileName);
String path = request.getServletContext().getRealPath("/upload");
File realPath = new File(path);
if (!realPath.exists()) {
boolean mkdir = realPath.mkdir();
}
System.out.println("upload File save Path" + realPath);
InputStream inputStream = file.getInputStream();
OutputStream outputStream = new FileOutputStream(new File(realPath, uploadFileName));
int len = 0;
byte[] buffer = new byte[1024];
while ((len = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
outputStream.flush();
}
outputStream.close();
inputStream.close();
return "redirect:/index.jsp";
}
@RequestMapping("/upload2")
public String upload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {
String path = request.getServletContext().getRealPath("/upload");
File realPath = new File(path);
if (!realPath.exists()) {
boolean mkdir = realPath.mkdir();
}
System.out.println("upload File save Path" + realPath);
file.transferTo(new File(realPath + "/" + file.getOriginalFilename()));
return "redirect:/index.jsp";
}
@RequestMapping("/downloads")
public String downloads(HttpServletRequest request, HttpServletResponse response) throws Exception {
String path = request.getServletContext().getRealPath("/upload");
String fileName = "test.jpg";
//设置response响应头
response.reset();
response.setCharacterEncoding("UTF-8");
response.setContentType("multipart/form-data");
//设置相应头
response.setHeader("Content-Disposition", "attachment;fileName" + URLEncoder.encode(fileName, "UTF-8"));
File file = new File(path, fileName);
InputStream inputStream = new FileInputStream(file);
OutputStream outputStream = new FileOutputStream(file);
byte[] buffer = new byte[1024];
int index = 0;
while ((index = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, index);
outputStream.flush();
}
outputStream.close();
inputStream.close();
return null;
}
}
<!-- applicationContext.xml 文件上传配置-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="uft-8"/>
<property name="maxUploadSize" value="10485760"/>
<property name="maxInMemorySize" value="40960"/>
</bean>
<form action="${pageContext.request.contextPath}/upload" enctype="multipart/form-data" method="post">
<input type="file" name="file">
<input type="submit" value="upload">
</form>
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