springMVC上传文件

今天上午在上课中，介绍了在一台服务器中，使用springMVC上传文件的操作,具体操作步骤有以下五步

　　1 引入依赖

​ 　　2 spring-mvc配置文件

​ 　　3 配置web.xml

​ 　　4 页面配置

​ 　　5 controller代码

详细代码如下：

1 引入依赖

<!--上传服务器-->
<dependency>
  <groupId>commons-fileupload</groupId>
  <artifactId>commons-fileupload</artifactId>
  <version>1.3.1</version>
</dependency>

2 spring-mvc配置文件

<!--配置文件上传解析器-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!--设置上传文件最大尺寸 5mb-->
    <property name="maxUploadSize">
        <value>5242800</value>
    </property>

​ 　　3 配置web.xml

　　

<display-name>Archetype Created Web Application</display-name>
<!--编码过滤器-->
<filter>
  <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>
<!--前端控制器-->
<servlet>
  <servlet-name>dispatcherServlet</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>
</servlet>
<servlet-mapping>
  <servlet-name>dispatcherServlet</servlet-name>
  <url-pattern>/</url-pattern>
</servlet-mapping>

​ 　　4 页面配置

　　<form action="${pageContext.request.contextPath}/user/upload">

　　　　<input tyep="file">

　　　　<input type="submit value="上传">

　　</form>

​ 　　5 controller代码

package cn.lijun.controller;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.UUID;

/**
 * @author lijun
 * @date 2019/7/11 9:52
 */
@Controller
@RequestMapping("/user")
public class UploaadContorller {
    //  接受数据
    @RequestMapping("/upload")
    public String upload(String username, MultipartFile upload,HttpServletRequest request){
        // 1 路径
        String realPath = request.getSession().getServletContext().getRealPath("/upload");
       File realFile =  new File(realPath);
       if(!realFile.exists()){
           realFile.mkdirs();
       }
       //2 文件的名称
        String uuidNmae = UUID.randomUUID().toString().replace("-", "");//sjdhjk-shfd
       //  获取文件的真实名字
        String originalFilename = upload.getOriginalFilename();
        System.out.println(originalFilename);
        // 唯一的名字
        String fileNmae = uuidNmae+originalFilename;
        System.out.println(fileNmae);
        // 文件上传
        try {
            upload.transferTo(new File(realFile,fileNmae));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "show";
    }