spring mvc 文件上传

1. spring -mvc.xml配置文件中，配置“multipartResolver”

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="50000000"/>
        <property name="defaultEncoding" value="UTF-8"/>
</bean>

2. 导入包

<dependency>
　　<groupId>commons-fileupload</groupId>
　　<artifactId>commons-fileupload</artifactId>
　　<version>1.3.1</version>
</dependency>

<dependency>
　　<groupId>commons-io</groupId>
　　<artifactId>commons-io</artifactId>
　　<version>2.4</version>
</dependency>

<dependency>
　　<groupId>commons-lang</groupId>
　　<artifactId>commons-lang</artifactId>
　　<version>2.4</version>
</dependency>

3. 前端 html 代码

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

4. tomcat 配置静态地址

　　3.1 进入tomcat 目录，打开 server.xml 

　　3.2 在 server.xml 的<Host> 标签对内添加代码

<!-- 
     docBase：本地路径
     path：虚拟路径
 -->
<Context docBase="F:	omcat-upload" path="/upload" debug="0" reloadable="true"/>

5. 文件上传工具类

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang.math.RandomUtils;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Upload {

    //源文件名
    private String originalFilename;

    //源文件后缀名
    private String suffix;

    //存入数据库里的tomcat虚拟路径
    private String dbPath;

    public void setOriginalFilename(String originalFilename) {
        this.originalFilename = originalFilename;
    }

    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }

    public void setDbPath(String dbPath) {
        this.dbPath = dbPath;
    }

    public String getOriginalFilename() {
        return originalFilename;
    }

    public String getSuffix() {
        return suffix;
    }

    public String getDbPath() {
        return dbPath;
    }

    /**
     * 文件上传工具类
     * @param attach
     * @param request
     * @param uploader 文件上传者
     * @return
     */
    public boolean doUpload(MultipartFile attach, HttpServletRequest request, String uploader){

        if(!attach.isEmpty()){

            originalFilename = attach.getOriginalFilename();
System.out.println("==>上传的文件名："+originalFilename);

            suffix = FilenameUtils.getExtension(originalFilename);
System.out.println("==>上传的文件后缀名："+suffix);

            long fileSize = attach.getSize();
System.out.println("==>上传文件的大小："+fileSize);

            String currentFilename = System.currentTimeMillis()+ RandomUtils.nextInt(1000000)+"."+suffix;
System.out.println("==>存储的上传文件名："+currentFilename);

            String savePath = "F:/tomcat-upload"+request.getContextPath() +"/" + uploader + "/" + new SimpleDateFormat("yyyy-MM-dd").format(new Date());
System.out.println("==>上传文件保存的真实路径："+savePath);

            File targetFile = new File(savePath, currentFilename);
            if(!targetFile.exists()){
                targetFile.mkdirs();
            }

            try{
                attach.transferTo(targetFile);
            }catch (Exception e){
                e.printStackTrace();
                request.setAttribute("uploadMsg","文件上传失败！");
                return false;
            }

            dbPath = "/upload" + request.getContextPath() + "/" + uploader + "/" + new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + "/" + currentFilename;
            return true;
        }else{
            return false;
        }

    }
}

6. controller 代码

　　@RequestMapping(value = "/url")
    public String doEditor(
            @RequestParam(value="file",required=false)MultipartFile file,HttpServletRequest request) {

        Upload upload = new Upload();
        boolean flag = upload.doUpload(file,request,uploader);
            
        if (flag) {
            
            return "url";
        } else{
            
            return "url";
        }
        
    }

 controller层只提供主要代码，部分代码需要根据自己实际情况进行添加。