pom.xml导入commons-io坐标
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.3</version>
</dependency>在配置文件中配置项目上传文件保存的位置
#项目上传文件保存的位置
fileSaveDirectory=D:/G(other)/temp/读取配置文件配置的工具类ConfigReaderUtil
public class ConfigReaderUtil {
public ConfigReaderUtil(){}
private static Properties props = new Properties();
static{
try {
//加载配置文件，需要手动指定配置文件
props.load(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream("application.properties"),"UTF-8"));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/*根据key获取value*/
public static String getValue(String key){
return props.getProperty(key).trim();
}
}
上传下载文件工具类
public class FileUtil {
// 读取配置文件中上传文件保存的位置
private static String fileSaveUrl = ConfigReaderUtil.getValue("fileSaveDirectory");
//文件下载
public static void downloadLawFile(HttpServletResponse response, File file) throws IOException {
OutputStream os = null;
InputStream in = null;
try {
if (file.exists()) { // 文件存在
os = response.getOutputStream();
response.reset();
response.setContentType("application/octet-stream;charset=utf-8");
// 设置文件名
response.setHeader("Content-disposition",
"attachment; filename=" + new String(file.getName().getBytes("gb2312"), "iso-8859-1"));
in = new FileInputStream(file);
byte[] b = new byte[1024 * 1024];
int length;
while ((length = in.read(b)) != -1) { // 读取内容放到数组里面
os.write(b, 0, length);
}
} else { // 文件不存在
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
out.write("文件不存在，请联系管理员！");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (in != null) {
in.close();
}
if (os != null) {
os.close();
}
}
}
//文件上传进行保存
public static void uploadFile(MultipartFile file) throws Exception {
if (file != null) {
String path = fileSaveUrl; // 文件保存路径
String filename = file.getOriginalFilename(); // 获取原文件全名,包含文件类型
//String fileType = StringUtils.getFilenameExtension(filename); //获取文件类型 txt doc png jpg...
File newFile = new File(path + filename);
IOUtils.copy(file.getInputStream(), new FileOutputStream(newFile));
}
}
使用：
前端页面
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="/manager/js/jquery-3.4.1.min.js"></script>
</head>
<body>
<input type="file" id="fil">
<button class="upload">上传</button>
</body>
</html>
<script>
$('.upload').click(function(){
var file = $("#fil")[0].files[0];
var formData = new FormData();
formData.append("file", file);
$.ajax({
type: 'POST',
url: '/manager/file/upload',
data: formData,
async: false,
contentType: false, // 告诉jQuery不要去设置Content-Type请求头
processData: false, // 告诉jQuery不要去处理发送的数据
success: function (resu) {
}
});
});
</script><!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="/manager/js/jquery-3.4.1.min.js"></script>
</head>
<body>
<button class="upload">download</button>
</body>
</html>
<script>
$('.upload').click(function(){
window.location.href="http://localhost:8080/manager/file/download";
});
</script>后端接口Controller
// 文件上传
@RequestMapping(value = "/file/upload", method = RequestMethod.POST)
@ResponseBody
public String fileUpload(@RequestParam MultipartFile file) throws Exception {
FileUtil.uploadFile(file);
return "success";
}
// 文件下载
@RequestMapping("/file/download")
@ResponseBody
public void fileDownload(HttpServletResponse response) throws Exception {
File file = new File("C:/Users/Lonely/Desktop/work/1.txt");
FileUtil.downloadLawFile(response, file);
}