spring boot实现文件的上传和返回Json的结果
程序员文章站
2024-02-03 10:00:58
...
一、spring boot实现文件的上传
spring boot实现文件的上传与springMVC的步骤基本一致：
1、提供上传页面upload.html（resources或static文件夹下都可）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form method="post" action="upload" enctype="multipart/form-data">
选择上传文件：<input type="file" name="upload"><br>
<input type="submit" value="上传">
</form>
</body>
</html>
2、编写上传逻辑代码
package com.springboot.demo.Controller;
import com.springboot.demo.utils.JsonData;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
@RestController
public class UploadController {
@RequestMapping("upload")
public String upload(MultipartFile upload){//upload应与前端input框的name值保持一致
//1.获取上传文件的名称
String filename = upload.getOriginalFilename();
//2.设置文件路径
String path = "D:\\upload";
//3.判断文件是否存在
File file = new File(path);
if (!file.exists()){
file.mkdir();
}
//4.修改文件名称
String suffix = filename.substring(filename.lastIndexOf("."));
//4.1拼接文件名
String newname = path+File.separator+System.currentTimeMillis()+suffix;
try {
//5.上传
upload.transferTo(new File(newname));
return "上传成功";
} catch (IOException e) {
e.printStackTrace();
return "上传失败";
}
}
//多文件上传
@RequestMapping("uploadlist")
public String uploadlist(MultipartFile[] upload){
//1.设置文件路径
String path = "D:\\upload";
//2.判断文件是否存在
File file = new File(path);
if (!file.exists()){
file.mkdir();
}
for (int i = 0; i < upload.length; i++) {
//3.获取上传文件的名称
String filename = upload[i].getOriginalFilename();
//4.修改文件名称
String suffix = filename.substring(filename.lastIndexOf("."));
//4.1拼接文件名
String newname = path+File.separator+System.currentTimeMillis()+suffix;
try {
//5.上传
upload[i].transferTo(new File(newname));
return "上传成功";
} catch (IOException e) {
e.printStackTrace();
return "上传失败";
}
}
return "上传成功";
}
}
3、提供json工具类 ，在demo下创建utils文件夹，创建JsonData工具类
package com.springboot.demo.utils;
public class JsonData {
private Integer code; //请求成功或失败的一个响应码
private String msg; //成功或失败的一个信息描述
private Object data; //响应的具体数据
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
public JsonData() {
}
public JsonData(Integer code, String msg, Object data) {
this.code = code;
this.msg = msg;
this.data = data;
}
//需要向外部暴露的成功或失败的处理
public static JsonData buildsuccess(Object data){
return new JsonData(200,"操作成功",data);
}
public static JsonData buildfail(){//此处也可传入错误的数据，根据需求填写。
return new JsonData(-100,"操作失败",null);
}
}
4、在启动类配置上传参数，即修改步骤2的数据返回类型为JsonData，并修改return的数据：
@RestController
public class UploadController {
@RequestMapping("upload")
public JsonData upload(MultipartFile upload){//upload应与前端input框的name值保持一致
//1.获取上传文件的名称
String filename = upload.getOriginalFilename();
//2.设置文件路径
String path = "D:\\upload";
//3.判断文件是否存在
File file = new File(path);
if (!file.exists()){
file.mkdir();
}
//4.修改文件名称
String suffix = filename.substring(filename.lastIndexOf("."));
//4.1拼接文件名
String newname = path+File.separator+System.currentTimeMillis()+suffix;
try {
//5.上传
upload.transferTo(new File(newname));
return JsonData.buildsuccess(null);
} catch (IOException e) {
e.printStackTrace();
return JsonData.buildfail();
}
}
}
5、测试，浏览器输入http://localhost:8080/upload.html，选择文件点击上传，成功页面。