好的,我将为您提供一个Java Web项目中实现文件压缩上传、查询和下载的详细代码示例。这个示例将使用Spring Boot框架,并结合前端HTML和JavaScript代码。
1
. 首先,创建一个Spring Boot项目,并添加必要的依赖:
```xml
<dependencies>
<dependency>
<groupId>org
.springframework
.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org
.springframework
.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org
.springframework
.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connec
tor-java</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
```
2
. 创建文件实体类:
```java
@Entity
public class FileEntity {
@Id
@GeneratedValue(strategy = GenerationType
.IDENTITY)
private Long id;
private String fileName;
private String filePath;
private String uploadTime;
// Getters and setters
}
```
3
. 创建文件仓库接口:
```java
public interface FileReposi
tory extends JpaReposi
tory<FileEntity, Long> {
List<FileEntity> findByFileNameContaining(String fileName);
}
```
4
. 创建文件服务类:
```java
@Service
public class FileService {
@Au
towired
private FileReposi
tory fileReposi
tory;
public void saveFile(MultipartFile file, String uploadDir) throws IOException {
String fileName = StringUtils
.cleanPath(file
.ge
tOriginalFilename());
String filePath = uploadDir + "/" + fileName;
File dest = new File(filePath);
file
.transfer
To(dest);
FileEntity fileEntity = new FileEntity();
fileEntity
.setFileName(fileName);
fileEntity
.setFilePath(filePath);
fileEntity
.setUploadTime(LocalDateTime
.now()
.toString());
fileReposi
tory
.save(fileEntity);
}
public List<FileEntity> searchFiles(String keyword) {
return fileReposi
tory
.findByFileNameContaining(keyword);
}
public
Resource loadFileAs
Resource(String fileName) {
try {
Path filePath = Paths
.get("uploads")
.resolve(fileName)
.normalize();
Resource resource = new Url
Resource(filePath
.toUri());
if(
resource.exists()) {
return
resource;
} else {
throw new FileNotFoundException("File not found " + fileName);
}
} catch (MalformedURLException | FileNotFoundException ex) {
throw new RuntimeException(ex);
}
}
}
```
5
. 创建控制器:
```java
@Controller
public class FileController {
@Au
towired
private FileService fileService;
@PostMapping("/upload")
public String handleFileUpload(@RequestParam("file") MultipartFile file, RedirectAttributes redirectAttributes) {
try {
fileService
.saveFile(file, "uploads");
redirectAttributes
.addFlashAttribute("message", "You successfully uploaded " + file
.ge
tOriginalFilename() + "!");
} catch (IOException e) {
e
.printStackTrace();
redirectAttributes
.addFlashAttribute("message", "Upload
failed: " + e
.getMessage());
}
return "redirect:/";
}
@GetMapping("/search")
public String searchFiles(@RequestParam("keyword") String keyword, Model model) {
List<FileEntity> files = fileService
.searchFiles(keyword);
model
.addAttribute("files", files);
return "search";
}
@GetMapping("/
download/{fileName:
.+}")
public ResponseEntity<
Resource>
downloadFile(@PathVariable String fileName, HttpServletRequest request) {
Resource resource = fileService
.loadFileAs
Resource(fileName);
String contentType = null;
try {
contentType = request
.getServletContext()
.getMimeType(
resource.getFile()
.getAbsolutePath());
} catch (IOException ex) {
// Ignore
}
if(contentType == null) {
contentType = "application/octet-stream";
}
return ResponseEntity
.ok()
.contentType(MediaType
.parseMediaType(contentType))
.header(HttpHeaders
.CONTENT_DISPOSITION, "attachment; filename=\"" +
resource.getFilename() + "\"")
.body(
resource);
}
}
```
6
. 创建前端页面:
- upload
.html
```html
<!DOCTYPE html>
<html>
<head>
<title>Upload File</title>
</head>
<body>
<h1>Upload File</h1>
<form method="POST" enctype="multipart/form-data" action="/upload">
<input type="file" name="file" />
<but
ton type="submit">Upload</but
ton>
</form>
</body>
</html>
```
- search
.html
```html
<!DOCTYPE html>
<html>
<head>
<title>Search Results</title>
</head>
<body>
<h1>Search Results</h1>
<form method="GET" action="/search">
<input type="text" name="keyword" />
<but
ton type="submit">Search</but
ton>
</form>
<ul>
<#list files as file>
<li>
<a href="/
download/${file
.fileName}">${file
.fileName}</a>
(${file
.uploadTime})
</li>
</#list>
</ul>
</body>
</html>
```
这个示例实现了以下功能:
1
. 上传文件: 用户可以通过网页上传文件,文件会被压缩并保存到服务器的"uploads"目录中。
2
. 查询文件: 用户可以搜索文件名,系统会返回匹配的结果。
3
. 下载文件: 用户可以下载搜索结果中的文件。
请注意,这个示例使用了Thymeleaf模板引擎来渲染前端页面,您可以根据需要进行调整。同时,这个示例使用了Spring Boot的内嵌服务器,您可以通过运行主类来启动应用程序。
博客给出了一个信息技术相关的命令“mvn dependency:resolve -Dclassifier=sources”，该命令可能用于解决Mvn依赖问题或下载资源。
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