SpringBoot中如何實(shí)現(xiàn)下載上傳？針對(duì)這個(gè)問題，這篇文章詳細(xì)介紹了相對(duì)應(yīng)的分析和解答，希望可以幫助更多想解決這個(gè)問題的小伙伴找到更簡(jiǎn)單易行的方法。
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最近在學(xué)習(xí)SpringBoot，以下是最近學(xué)習(xí)整理的實(shí)現(xiàn)文件上傳下載的Java代碼：
1、開發(fā)環(huán)境：
IDEA15+ Maven+JDK1.8
2、新建一個(gè)maven工程：
3、工程框架
4、pom.xml文件依賴項(xiàng)
4.0.0 SpringWebContent SpringWebContent war 1.0-SNAPSHOT SpringWebContent Maven Webapp http://maven.apache.org org.springframework.boot spring-boot-starter-parent 1.4.3.RELEASE org.springframework.boot spring-boot-starter-thymeleaf org.springframework.boot spring-boot-devtools true junit junit 3.8.1 test 1.8 SpringWebContent org.springframework.boot spring-boot-maven-plugin
5、Application.java
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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}6、FileController.java
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.List;
@Controller
public class FileController {
@RequestMapping("/greeting")
public String greeting(@RequestParam(value="name", required=false, defaultValue="World") String name, Model model) {
model.addAttribute("name", name);
return "greeting";
}
private static final Logger logger = LoggerFactory.getLogger(FileController.class);
//文件上傳相關(guān)代碼
@RequestMapping(value = "upload")
@ResponseBody
public String upload(@RequestParam("test") MultipartFile file) {
if (file.isEmpty()) {
return "文件為空";
}
// 獲取文件名
String fileName = file.getOriginalFilename();
logger.info("上傳的文件名為：" + fileName);
// 獲取文件的后綴名
String suffixName = fileName.substring(fileName.lastIndexOf("."));
logger.info("上傳的后綴名為：" + suffixName);
// 文件上傳后的路徑
String filePath = "E://test//";
// 解決中文問題，liunx下中文路徑，圖片顯示問題
// fileName = UUID.randomUUID() + suffixName;
File dest = new File(filePath + fileName);
// 檢測(cè)是否存在目錄
if (!dest.getParentFile().exists()) {
dest.getParentFile().mkdirs();
}
try {
file.transferTo(dest);
return "上傳成功";
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return "上傳失敗";
}
//文件下載相關(guān)代碼
@RequestMapping("/download")
public String downloadFile(org.apache.catalina.servlet4preview.http.HttpServletRequest request, HttpServletResponse response){
String fileName = "FileUploadTests.java";
if (fileName != null) {
//當(dāng)前是從該工程的WEB-INF//File//下獲取文件(該目錄可以在下面一行代碼配置)然后下載到C:\\users\\downloads即本機(jī)的默認(rèn)下載的目錄
String realPath = request.getServletContext().getRealPath(
"http://WEB-INF//");
File file = new File(realPath, fileName);
if (file.exists()) {
response.setContentType("application/force-download");// 設(shè)置強(qiáng)制下載不打開
response.addHeader("Content-Disposition",
"attachment;fileName=" + fileName);// 設(shè)置文件名
byte[] buffer = new byte[1024];
FileInputStream fis = null;
BufferedInputStream bis = null;
try {
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
OutputStream os = response.getOutputStream();
int i = bis.read(buffer);
while (i != -1) {
os.write(buffer, 0, i);
i = bis.read(buffer);
}
System.out.println("success");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
return null;
}
//多文件上傳
@RequestMapping(value = "/batch/upload", method = RequestMethod.POST)
@ResponseBody
public String handleFileUpload(HttpServletRequest request) {
List files = ((MultipartHttpServletRequest) request)
.getFiles("file");
MultipartFile file = null;
BufferedOutputStream stream = null;
for (int i = 0; i < files.size(); ++i) {
file = files.get(i);
if (!file.isEmpty()) {
try {
byte[] bytes = file.getBytes();
stream = new BufferedOutputStream(new FileOutputStream(
new File(file.getOriginalFilename())));
stream.write(bytes);
stream.close();
} catch (Exception e) {
stream = null;
return "You failed to upload " + i + " => "
+ e.getMessage();
}
} else {
return "You failed to upload " + i
+ " because the file was empty.";
}
}
return "upload successful";
} 7、index.html
關(guān)于SpringBoot中如何實(shí)現(xiàn)下載上傳問題的解答就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，如果你還有很多疑惑沒有解開，可以關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道了解更多相關(guān)知識(shí)。
