文件上传
单文件上传
upload.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>单文件上传</title>
</head>
<body>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFile" value="请选择文件"/>
<input type="submit" value="上传"/>
</form>
</body>
</html>
FileUploadController.java
/**
* 文件上传接口
*
* @Auther: MaWenyi
* @Date: 2019/6/24
* @Description: com.iscolt.multipart.web.controller
* @version: 1.0
*/
@RestController
public class FileUploadController {
// 格式化日期
SimpleDateFormat simpleFormatter = new SimpleDateFormat("yyyy/MM/dd");
@PostMapping("upload")
public String upload(MultipartFile uploadFile, HttpServletRequest request) {
String realPath = request.getServletContext().getRealPath("/uploadFile/");
//String realPath = "src/main/resources/" + IMG_PATH_PREFIX + "/";
System.out.println(realPath);
String format = simpleFormatter.format(new Date());
File folder = new File(realPath + format);
if (!folder.isDirectory()) {
folder.mkdirs();
}
String oldName = uploadFile.getOriginalFilename();
String newName = UUID.randomUUID().toString()
+ oldName.substring(oldName.lastIndexOf("."), oldName.length());
try {
uploadFile.transferTo(new File(folder, newName));
String filePath = request.getScheme()
+ "://"
+ request.getServerName()
+ ":"
+ request.getServerPort()
+ "/uploadFile/"
+ format
+ "/"
+ newName;
return "<a href='" + filePath + "'>"+ filePath +"</a>";
} catch (IOException e) {
e.printStackTrace();
}
return "上传失败!";
}
}
细节配置
# 是否开启文件上传支持
spring.servlet.multipart.enabled=true
# 写入磁盘阈值, 默认为0
spring.servlet.multipart.file-size-threshold=0
# 临时保存位置
spring.servlet.multipart.location=E:\\temp
# 上传时单文件的总大小, 默认为1MB
spring.servlet.multipart.max-file-size=1MB
# 上传时多文件的总大小, 默认为10MB
spring.servlet.multipart.max-request-size=10MB
# 文件是否延迟解析, 默认为false
spring.servlet.multipart.resolve-lazily=false
多文件上传
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>单/多 文件上传</title>
</head>
<body>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFile" value="请选择文件"/>
<input type="submit" value="单上传"/>
</form>
<form action="/uploads" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFiles" value="请选择文件" multiple/>
<input type="submit" value="多上传"/>
</form>
</body>
</html>
/**
* 多文件上传
*
* @param uploadFiles
* @param request
* @return
*/
@PostMapping("uploads")
public String upload(MultipartFile[] uploadFiles, HttpServletRequest request) {
String realPath = request.getServletContext().getRealPath("/uploadFile/");
//String realPath = "src/main/resources/" + IMG_PATH_PREFIX + "/";
System.out.println(realPath);
String format = simpleFormatter.format(new Date());
File folder = new File(realPath + format);
if (!folder.isDirectory()) {
folder.mkdirs();
}
String filePath = "";
if (uploadFiles.length > 0) {
for (int i=0; i<uploadFiles.length; i++){
String oldName = uploadFiles[i].getOriginalFilename();
String newName = UUID.randomUUID().toString()
+ oldName.substring(oldName.lastIndexOf("."), oldName.length());
try {
uploadFiles[i].transferTo(new File(folder, newName));
filePath = request.getScheme()
+ "://"
+ request.getServerName()
+ ":"
+ request.getServerPort()
+ "/uploadFile/"
+ format
+ "/"
+ newName
+ "<br>"
+ filePath;
System.out.println(filePath);
} catch (IOException e) {
e.printStackTrace();
}
}
return filePath;
}
return "上传失败!";
}
@ControllerAdvice
@ ControllerAdvice 主要用来处理全局数据, 一般搭配
@ExceptionHandler、@ModelAttribute 以及@InitBinder使用.
全局异常处理
/**
* 全局异常处理
*
* @Auther: MaWenyi
* @Date: 2019/6/25
* @Description: com.iscolt.multipart
* @version: 1.0
*/
@RestControllerAdvice
public class CustomExeptionHandler {
@ExceptionHandler(MaxUploadSizeExceededException.class)
public ModelAndView uploadException(MaxUploadSizeExceededException e) throws IOException {
ModelAndView mv = new ModelAndView();
mv.addObject("msg", "上传文件大小超过限制");
mv.setViewName("error");
return mv;
}
}
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>异常显示</title>
</head>
<body>
<div th:text="${msg}"></div>
</body>
</html>
添加全局数据
@ControllerAdvice 是一个全局数据处理组件, 因此也可以在@ControllerAdvice中配置全局数据, 使用
@ModelAttribute注解进行配置.
/**
* 添加全局数据
*
* @Auther: MaWenyi
* @Date: 2019/6/25
* @Description: com.iscolt.multipart.config
* @version: 1.0
*/
@ControllerAdvice
public class GlobalConfig {
@ModelAttribute(value = "info")
public Map<String, String> userInfo() {
HashMap<String, String> map = new HashMap<>();
map.put("username", "idler");
map.put("gender", "男");
return map;
}
}
Controller 示例代码如下:
/**
* 验证全局数据
*
* @Auther: MaWenyi
* @Date: 2019/6/25
* @Description: com.iscolt.multipart.web.controller
* @version: 1.0
*/
@Controller
public class HelloController {
/**
* 拿全局变量
*
* @param model
*/
@GetMapping("/hello")
@ResponseBody
public void hello(Model model) {
Map<String, Object> map = model.asMap();
Set<String> keySet = map.keySet();
// 遍历
Iterator<String> iterator = keySet.iterator();
while (iterator.hasNext()) {
String key = iterator.next();
Object value =map.get(key);
System.out.println(key + ">>>" + value);
}
}
/**
* 拿全局变量, 简单版
*
* @param model
*/
@GetMapping("/helloEasy")
@ResponseBody
public void helloEasy(Model model) {
Map<String, Object> map = model.asMap();
System.out.println(map.get("info"));
}
}
自定义错误页面
参考旧址
简单配置
resources下新建 error,新建
404.html和500.html或4xx.html,5xx.html
错误信息:
| timestamp | status | error | message | path |
|---|---|---|---|---|
| 某时间 | 404 | Not... | 信息 | /xxx |
页面中
$获取即可, 例如${status}
复杂配置
自定义Error数据
继承
DefaultErrorAttributes, 重写getErrorAttributes()
自定义Error视图
实现
ErrorViewResolver接口, 重写resolveErrorView(), 返回ModelAndView
完全自定义
继承
BasicErrorController来实现自己的ErrorController
