springboot 上传

package com.springboot.chapter10.controller;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Part;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

/**** imports ****/
@Controller
@RequestMapping("/file")
public class FileController {
    /**
     * 打开文件上传请求页面
     * @return 指向JSP的字符串
     */
    @GetMapping("/upload/page")
    public String uploadPage() {
        return "/file/upload";
    }
    
    // 使用HttpServletRequest作为参数
    @PostMapping("/upload/request")
    @ResponseBody
    public Map<String, Object> uploadRequest(HttpServletRequest request) {
        boolean flag = false;
        MultipartHttpServletRequest mreq = null;
        // 强制转换为MultipartHttpServletRequest接口对象
        if (request instanceof MultipartHttpServletRequest) {
            mreq = (MultipartHttpServletRequest) request;
        } else {
            return dealResultMap(false, "上传失败");
        }
        // 获取MultipartFile文件信息
        MultipartFile mf = mreq.getFile("file");
        // 获取源文件名称
        String fileName = mf.getOriginalFilename();
        File file = new File(fileName);
        try {
            // 保存文件
            mf.transferTo(file);
        } catch (Exception e) {
            e.printStackTrace();
            return dealResultMap(false, "上传失败");
        } 
        return dealResultMap(true, "上传成功");
    }
    
    // 使用Spring MVC的MultipartFile类作为参数
    @PostMapping("/upload/multipart")
    @ResponseBody
    public Map<String, Object> uploadMultipartFile(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        File dest = new File(fileName);
        try {
            file.transferTo(dest);
        } catch (Exception e) {
            e.printStackTrace();
            return dealResultMap(false, "上传失败");
        } 
        return dealResultMap(true, "上传成功");
    }
    
    @PostMapping("/upload/part")
    @ResponseBody
    public Map<String, Object> uploadPart(Part file) {
        // 获取提交文件名称
        String fileName = file.getSubmittedFileName();
        try {
            // 写入文件
            file.write(fileName);
        } catch (Exception e) {
            e.printStackTrace();
            return dealResultMap(false, "上传失败");
        } 
        return dealResultMap(true, "上传成功");
    }
    
    // 处理上传文件结果
    private Map<String, Object> dealResultMap(boolean success, String msg) {
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("success", success);
        result.put("msg", msg);
        return result;
    }
}

jsp

<%@ 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>文件上传</title>
</head>
    <body>
        <form method="post" 
                action="./part" enctype="multipart/form-data">
            <input type="file" name="file" value="请选择上传的文件" /> 
            <input type="submit" value="提交" />
        </form>
    </body>
</html>

applicationContext

spring.servlet.multipart.location=e:/springboot
# \u9650\u5236\u5355\u4E2A\u6587\u4EF6\u6700\u5927\u5927\u5C0F\uFF0C\u8FD9\u91CC\u8BBE\u7F6E\u4E3A5M
spring.servlet.multipart.max-file-size=5242880
# \u9650\u5236\u6240\u6709\u6587\u4EF6\u6700\u5927\u5927\u5C0F,\u8FD9\u91CC\u8BBE\u7F6E\u4E3A20M
spring.servlet.multipart.max-request-size=20MB

springboot 上传

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