spring mvc 檔案上傳並攜帶其他引數
阿新 • • 發佈：2019-01-08
這是主要使用到的jar 檔案是：spring mvc +apache common-fileuplad
第一步：web.xml 檔案。【重點是spring mvc的攔截器和相關監聽器】
<?xml version="1.0" encoding="UTF-8"?> <web-app version="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的配置檔案 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mybatis.xml</param-value> </context-param> <!-- 編碼過濾器 --> <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監聽器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 防止Spring記憶體溢位監聽器 --> <listener> <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class> </listener> <!-- Spring MVC servlet --> <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> <!-- 此處可以可以配置成*.do，對應struts的字尾習慣 --> <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 配置檔案【重點：spring mvc 檢視模式，spring mvc 檔案上傳限定引數，spring mvc 資源攔截管理和其他】
第三步：jsp 頁面<?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: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"> <!-- 自動掃描該包，使SpringMVC認為包下用了@controller註解的類是控制器 --> <mvc:annotation-driven /> <mvc:default-servlet-handler/> <context:annotation-config/> <context:component-scan base-package="com" /> <!--避免IE執行AJAX時，返回JSON出現下載檔案 --> <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> </list> </property> </bean> <!-- 啟動SpringMVC的註解功能，完成請求和註解POJO的對映 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <ref bean="mappingJacksonHttpMessageConverter" /> <!-- JSON轉換器 --> </list> </property> </bean> <!-- 定義跳轉的檔案的前後綴 ，檢視模式配置--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 這裡的配置我的理解是自動給後面action的方法return的字串加上字首和字尾，變成一個 可用的url地址 --> <property name="prefix" value="/backstage/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 配置檔案上傳，如果沒有使用檔案上傳可以不用配置，當然如果不配，那麼配置檔案中也不必引入上傳元件包 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 預設編碼 --> <property name="defaultEncoding" value="utf-8" /> <!-- 檔案大小最大值 --> <property name="maxUploadSize" value="10485760000" /> <!-- 記憶體中的最大值 --> <property name="maxInMemorySize" value="40960" /> </bean> <!-- 宣告DispatcherServlet不要攔截下面宣告的目錄 --> <mvc:resources location="/js/" mapping="/js/**" /> <mvc:resources location="/images/" mapping="/images/**"/> <mvc:resources location="/css/" mapping="/css/**"/> <mvc:resources location="/common/" mapping="/common/**"/> </beans>
<%@ page language="java" pageEncoding="UTF-8"%> <form action="<%=request.getContextPath()%>/users/add" method="POST" enctype="multipart/form-data"> username: <input type="text" name="username"/><br/> nickname: <input type="text" name="nickname"/><br/> password: <input type="password" name="password"/><br/> yourmail: <input type="text" name="email"/><br/> yourfile: <input type="file" name="myfiles"/><br/> <input type="submit" value="新增新使用者"/> </form>
第四步：spring mvc 控制器程式碼
package com.wlsq.controller;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import com.wlsq.model.News;
import com.wlsq.service.IUserMapperService;
import com.wlsq.util.Pagination;
@Controller
@RequestMapping(value="/users")
public class UserController {
@Autowired
private IUserMapperService userService;
@RequestMapping(value="/userAll")
public ModelAndView searchNews(HttpServletRequest request,HttpServletResponse response){
ModelAndView mv = null;
try{
mv = new ModelAndView();
int pageSize = Integer
.parseInt(request.getParameter("pageSize") == null ? "10"
: request.getParameter("pageSize"));
int pageNum = Integer
.parseInt(request.getParameter("pageNum") == null ? "1"
: request.getParameter("pageNum"));
Map<String, Object> maps = new HashMap<>();
maps.put("pageSize", pageSize);
maps.put("pageNum", (pageNum-1) * pageSize);
List<News> list =userService.selectAllUsers(maps);
int count = userService.selectCountUsers();
Pagination page = new Pagination(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){
//使用者存在
mv.addObject("partners", list);
//設定邏輯檢視名，檢視解析器會根據該名字解析到具體的檢視頁面
mv.setViewName("/users/users");
}else{
//使用者存在
mv.addObject("partners", list);
//設定邏輯檢視名，檢視解析器會根據該名字解析到具體的檢視頁面
mv.setViewName("/users/users");
}
}catch(Exception e){
//設定邏輯檢視名，檢視解析器會根據該名字解析到具體的檢視頁面
mv.setViewName("/users/users");
}
return mv;
}
@RequestMapping(value="/add", method=RequestMethod.POST)
public String addUser(@RequestParam MultipartFile[] myfiles, HttpServletRequest request) throws IOException{
String username = request.getParameter("username");
String nickname = request.getParameter("nickname");
String password = request.getParameter("password");
String email = request.getParameter("email");
System.out.println("name:"+username);
System.out.println("nickname:"+nickname);
System.out.println("password:"+password);
System.out.println("email:"+email);
//如果只是上傳一個檔案，則只需要MultipartFile型別接收檔案即可，而且無需顯式指定@RequestParam註解
//如果想上傳多個檔案，那麼 這裡就要用MultipartFile[]型別來接收檔案，並且還要指定@RequestParam註解
//並且上傳多個檔案時，前臺表單中的所有<input type="file"/>的name都應該是myfiles，否則引數裡的myfiles無法獲取到所有上傳的檔案
for(MultipartFile myfile : myfiles){
if(myfile.isEmpty()){
System.out.println("檔案未上傳");
}else{
System.out.println("檔案長度: " + myfile.getSize());
System.out.println("檔案型別: " + myfile.getContentType());
System.out.println("檔名稱: " + myfile.getName());
System.out.println("檔案原名: " + myfile.getOriginalFilename());
System.out.println("========================================");
//如果用的是Tomcat伺服器，則檔案會上傳到\\%TOMCAT_HOME%\\webapps\\YourWebProject\\WEB-INF\\upload\\資料夾中
String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/upload");
//這裡不必處理IO流關閉的問題，因為FileUtils.copyInputStreamToFile()方法內部會自動把用到的IO流關掉，我是看它的原始碼才知道的
FileUtils.copyInputStreamToFile(myfile.getInputStream(), new File(realPath, myfile.getOriginalFilename()));
}
}
return "../../index";
}
}
記得在WEB-INFO建立存放上傳檔案目錄（upload）.