spring mvc实现文件上传并携带其他参数的示例

2024-02-29 12:11:03 41

这是主要使用到的jar文件是：springmvc+apachecommon-fileuplad

第一步：web.xml文件。【重点是springmvc的拦截器和相关监听器】

<?xmlversion="1.0"encoding="UTF-8"?>
<web-appversion="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<!--Spring和mybatis的配置文件-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mybatis.xml</param-value>
</context-param>
<!--编码过滤器-->
<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>
<!--Spring监听器-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--防止Spring内存溢出监听器-->
<listener>
<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>

<!--SpringMVCservlet-->
<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:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<!--此处可以可以配置成*.do，对应struts的后缀习惯-->
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index.jsp</welcome-file>
</welcome-file-list>
</web-app>

第二步：spring-mvc配置文件【重点：springmvc视图模式，springmvc文件上传限定参数，springmvc资源拦截管理和其他】

<?xmlversion="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"
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-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!--自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器-->
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
<context:annotation-config/>
<context:component-scanbase-package="com"/>
<!--避免IE执行AJAX时，返回JSON出现下载文件-->
<beanid="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<propertyname="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<!--启动SpringMVC的注解功能，完成请求和注解POJO的映射-->
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<propertyname="messageConverters">
<list>
<refbean="mappingJacksonHttpMessageConverter"/><!--JSON转换器-->
</list>
</property>
</bean>
<!--定义跳转的文件的前后缀，视图模式配置-->
<beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个可用的url地址-->
<propertyname="prefix"value="/backstage/jsp/"/>
<propertyname="suffix"value=".jsp"/>
</bean>

<!--配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包-->
<beanid="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--默认编码-->
<propertyname="defaultEncoding"value="utf-8"/>
<!--文件大小最大值-->
<propertyname="maxUploadSize"value="10485760000"/>
<!--内存中的最大值-->
<propertyname="maxInMemorySize"value="40960"/>
</bean>

<!--声明DispatcherServlet不要拦截下面声明的目录-->
<mvc:resourceslocation="/js/"mapping="/js/**"/>
<mvc:resourceslocation="/images/"mapping="/images/**"/>
<mvc:resourceslocation="/css/"mapping="/css/**"/>
<mvc:resourceslocation="/common/"mapping="/common/**"/>

</beans>

第三步：jsp页面

<%@pagelanguage="java"pageEncoding="UTF-8"%>
<formaction="<%=request.getContextPath()%>/users/add"method="POST"enctype="multipart/form-data">
username:<inputtype="text"name="username"/><br/>
nickname:<inputtype="text"name="nickname"/><br/>
password:<inputtype="password"name="password"/><br/>
yourmail:<inputtype="text"name="email"/><br/>
yourfile:<inputtype="file"name="myfiles"/><br/>
<inputtype="submit"value="添加新用户"/>
</form>

第四步：springmvc控制器代码

packagecom.wlsq.controller;

importjava.io.File;
importjava.io.IOException;
importjava.util.HashMap;
importjava.util.List;
importjava.util.Map;

importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

importorg.apache.commons.io.FileUtils;
importorg.springframework.beans.factory.annotation.Autowired;
importorg.springframework.stereotype.Controller;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RequestMethod;
importorg.springframework.web.bind.annotation.RequestParam;
importorg.springframework.web.multipart.MultipartFile;
importorg.springframework.web.servlet.ModelAndView;

importcom.wlsq.model.News;
importcom.wlsq.service.IUserMapperService;
importcom.wlsq.util.Pagination;

@Controller
@RequestMapping(value="/users")
publicclassUserController{
@Autowired
privateIUserMapperServiceuserService;

@RequestMapping(value="/userAll")
publicModelAndViewsearchNews(HttpServletRequestrequest,HttpServletResponseresponse){
ModelAndViewmv=null;
try{
mv=newModelAndView();
intpageSize=Integer
.parseInt(request.getParameter("pageSize")==null?"10"
:request.getParameter("pageSize"));
intpageNum=Integer
.parseInt(request.getParameter("pageNum")==null?"1"
:request.getParameter("pageNum"));
Map<String,Object>maps=newHashMap<>();
maps.put("pageSize",pageSize);
maps.put("pageNum",(pageNum-1)*pageSize);
List<News>list=userService.selectAllUsers(maps);
intcount=userService.selectCountUsers();
Paginationpage=newPagination(count);
page.setCurrentPage(pageNum);
mv.addObject("pnums",page.getPageNumList());
mv.addObject("currentPage",pageNum);
mv.addObject("pnext_flag",page.nextEnable());
mv.addObject("plast_flag",page.lastEnable());
page.lastPage();
mv.addObject("last_page",page.getCurrentPage());
mv.addObject("count",count);
mv.addObject("pageCount",page.getPages());
if(list!=null&&list.size()>0){
//用户存在
mv.addObject("partners",list);
//设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
mv.setViewName("/users/users");
}else{
//用户存在
mv.addObject("partners",list);
//设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
mv.setViewName("/users/users");
}

}catch(Exceptione){

//设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
mv.setViewName("/users/users");
}


returnmv;
}

@RequestMapping(value="/add",method=RequestMethod.POST)
publicStringaddUser(@RequestParamMultipartFile[]myfiles,HttpServletRequestrequest)throwsIOException{
Stringusername=request.getParameter("username");
Stringnickname=request.getParameter("nickname");
Stringpassword=request.getParameter("password");
Stringemail=request.getParameter("email");

System.out.println("name:"+username);
System.out.println("nickname:"+nickname);
System.out.println("password:"+password);
System.out.println("email:"+email);
//如果只是上传一个文件，则只需要MultipartFile类型接收文件即可，而且无需显式指定@RequestParam注解
//如果想上传多个文件，那么这里就要用MultipartFile[]类型来接收文件，并且还要指定@RequestParam注解
//并且上传多个文件时，前台表单中的所有<inputtype="file"/>的name都应该是myfiles，否则参数里的myfiles无法获取到所有上传的文件
for(MultipartFilemyfile:myfiles){
if(myfile.isEmpty()){
System.out.println("文件未上传");
}else{
System.out.println("文件长度:"+myfile.getSize());
System.out.println("文件类型:"+myfile.getContentType());
System.out.println("文件名称:"+myfile.getName());
System.out.println("文件原名:"+myfile.getOriginalFilename());
System.out.println("========================================");
//如果用的是Tomcat服务器，则文件会上传到\\%TOMCAT_HOME%\\webapps\\YourWebProject\\WEB-INF\\upload\\文件夹中
StringrealPath=request.getSession().getServletContext().getRealPath("/WEB-INF/upload");
//这里不必处理IO流关闭的问题，因为FileUtils.copyInputStreamToFile()方法内部会自动把用到的IO流关掉，我是看它的源码才知道的
FileUtils.copyInputStreamToFile(myfile.getInputStream(),newFile(realPath,myfile.getOriginalFilename()));
}
}

return"../../index";
}



}

记得在WEB-INFO建立存放上传文件目录（upload）

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spring mvc实现文件上传并携带其他参数的示例

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