SpringMVC 本地文件上传+跨服务器文件上传-蒲公英云

一、本地文件上传

先导入两个jar包依赖坐标

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>

文件上传的jsp页面注意form标签中的 entype属性需设置为multipart/form-data

<%@ page contentType=”text/html;charset=UTF-8” language=”java” %>

Title

controller控制页面

这里用到了MultipartFile 对象主要是用来文件上传

package com.qst.Controller;
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.util.UUID;
@Controller
@RequestMapping("/user")
public class UserController {
    @RequestMapping("/fileupload")
  public String fileupload(HttpServletRequest request , MultipartFile upload) throws Exception {
        System.out.println("上传。。。");
        String path = request.getSession().getServletContext().getRealPath("uploads");
        //判断该路径是否存在
        File file = new File(path);
        if(!file.exists()){
            //如果不存在则创建一个目录
            file.mkdirs();
        }
        //获取上传文件的名称
        String filename = upload.getOriginalFilename();
        //把文件名设置成一个唯一值
        String uid = UUID.randomUUID().toString().replace("-","");
        filename = uid + "_" + filename;
        //完成文件上传 , 将文件存放到 path 指定目录下 并 把名字设置为 filename 指定的名字
        upload.transferTo(new File(path,filename));
        return "success";
  }
}

配置文件解析器

这里bean的id必须为multipartResolver ，bean里还可以添加一些参数如设置上传文件的大小的最大值

<!--配置文件解析器-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--        配置上传文件的大小-->
        <property name="maxUploadSize" value="10000000"/>
    </bean>

二、跨服务器文件上传

先导jar包

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.sun.jersey/jersey-client -->
    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-client</artifactId>
      <version>1.19</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.sun.jersey/jersey-client -->
    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-core</artifactId>
      <version>1.19</version>
    </dependency>
  </dependencies>

创建连个服务器一个用于接收文件，一个用于上传文件。设置不同端口号

在接收文件的服务器项目中需要开启一个支持写操作

在web.xml中加入

<servlet>
    <servlet-name>default</servlet-name>
    <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
    <init-param>
      <param-name>debug</param-name>
      <param-value>0</param-value>
    </init-param>
    <init-param>
      <param-name>readonly</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>listings</param-name>
      <param-value>false</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>/</url-pattern>
        </servlet-mapping>

jsp页面也普通上传文件一样

<%@ page contentType=”text/html;charset=UTF-8” language=”java” %>

Title

controller

package com.qst.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.util.UUID;
@Controller
@RequestMapping("/user")
public class UserController {
    @RequestMapping("/fileuploadServer")
    public String fileuploadServer(MultipartFile upload) throws Exception {
        //设置上传服务器的路径 要保证有loads这个目录
        String path = "http://localhost:8089/loads";
        //获取上传文件的名称
        String filename = upload.getOriginalFilename();
        //把文件名设置成一个唯一值
        String uid = UUID.randomUUID().toString().replace("-","");
        filename = uid + "_" + filename;
//创建客户端对象
        Client client = Client.create();
//与服务器进行连接
        WebResource webResource = client.resource(path + filename);
//进行文件上传，并将文件转换成字节流
        webResource.put(upload.getBytes());
        return "success";
    }
}