springmvc单文件上传

Posted 2021-09-13 Jason

1、方式一
1.1、新建控制层

package com.xjh.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

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

/**
 * @author xjh
 * @description:
 * @date 2021-05-16
 */
@RestController
@RequestMapping("/file")
public class FileUpload {

    @RequestMapping("/uploadFile")
    public String uploadFile(@RequestParam MultipartFile file, HttpServletRequest request) {
        String name = file.getOriginalFilename();
        //String baseDir = "E:\\\\upload\\\\";
        String baseDir = request.getSession().getServletContext().getRealPath("upload");
        File f = new File(baseDir, name);
        if (!f.getParentFile().exists()) {
            if (!f.getParentFile().mkdir()) {
                throw new RuntimeException("目录:" + baseDir + "创建失败！");
            }
        }
        try {
            file.transferTo(new File(baseDir + File.separator + name));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "success";
    }

}

1.2、配置springmvc的配置文件xml

<!--声明上传请求,需引入commons-fileupload依赖-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!--可上传文件的最大值，单位：字节-->
        <property name="maxUploadSize" value="5120000" />
    </bean>

另外为了解决上传单行文本域有乱码问题，所以还需要再web.xml中声明编码过滤器，代码如下：

<!--字符编码过滤-->
  <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>

1.3、jsp页面

<form action="file/uploadFile" method="post" enctype="multipart/form-data">
    <input type="file" name="file"/>
    <input type="submit" value="上传"/>
</form>

小结：<input type="file" name="file"/>的name要与参数@RequestParam MultipartFile file名一样，如果注解指定值@RequestParam("fname")则，name要与fname一样。
2、方式二
2.1、新建控制层

@RequestMapping("/uploadFile")
    public String uploadFile(MultipartHttpServletRequest request) {
        MultipartFile file = request.getFile("file");
        String name = file.getOriginalFilename();
        String baseDir = "E:\\\\upload\\\\";
        //String baseDir = request.getSession().getServletContext().getRealPath("upload");
        File f = new File(baseDir, name);
        if (!f.getParentFile().exists()) {
            if (!f.getParentFile().mkdir()) {
                throw new RuntimeException("目录:" + baseDir + "创建失败！");
            }
        }
        try {
            file.transferTo(new File(baseDir + File.separator + name));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "success";
    }

2.2、同1.2
2.3、同1.3

上传文件相关依赖

<!--上传组件包-->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <!--IO流工具类包-->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.6</version>
    </dependency>
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.9</version>
    </dependency>