springmvc上传文件（图片）-蒲公英云

springmvc上传文件（图片）

环境：springmvc+spring+mybatis
前提环境，需要把ssm框架搭建好，如果没有搭建的话可以先搭建这个框架

然后需要添加jar包
pom里面添加

<!-- 上传组件 -->
    <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.10</version>
    </dependency>

然后需要在springmvc.xml的配置文件中添加上传的配置文件

<!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->  
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    
        <!-- 默认编码 -->  
        <property name="defaultEncoding" value="utf-8" />    
        <!-- 文件大小最大值 -->  
        <property name="maxUploadSize" value="10485760000" />    
        <!-- 内存中的最大值 -->  
        <property name="maxInMemorySize" value="40960"/>    
    </bean>

然后就可以开干了，
首先是前台页面jsp页面：

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>图片上传</title>
</head>
<body>
<form action="/eshop/upload/uploadimg" enctype="multipart/form-data" method="post">
    上传图片：<input type="file" name="file" value="选择图片"><br>
    <input type="submit" value="上传">
</form>
</body>
</html>

后台的controller类：

package com.xiaopengpeng.controller;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
@Controller
@RequestMapping("upload")
public class UploadController { 
    @RequestMapping("uploadimg")
    public String uploadimg(MultipartFile file) throws Exception{
        String filename = file.getOriginalFilename();
        System.out.println(filename);
        //写入本地磁盘
        InputStream is = file.getInputStream(); 
        byte[] bs = new byte[1024]; 
        int len; 
        OutputStream os = new FileOutputStream(new File("D:/temp/" + filename)); 
        while ((len = is.read(bs)) != -1) {  
            os.write(bs, 0, len); 
        }  
        os.close(); 
        is.close(); 
        return "ok";
    }
}

完成！

上面的java类上传图片的时候使用的是原生态的上传形式，使用的是底层的java的io流的，其实他们提供封装好的保存形式，所以可以将上面的contriller类该成下面的这个类：

package com.xiaopengpeng.controller;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
@Controller
@RequestMapping("upload")
public class UploadController {
    @RequestMapping("toUploadimg")
    public String toUploadimg(){
        return "uploadimg";
    }
    @RequestMapping("uploadimg")
    public String uploadimg(MultipartFile file) throws Exception{
        String filename = file.getOriginalFilename();
        file.transferTo(new File("D:/temp/" + filename));
        return "ok";
    }