Spring RestTemplate文件上传(Uploading MultipartFile with Spring RestTemplate)

 

文章《Uploading MultipartFile with Spring RestTemplate》

地址：https://www.baeldung.com/spring-rest-template-multipart-upload

代码：https://github.com/eugenp/tutorials/tree/master/spring-rest/src/main/java/com/baeldung/web/upload

client：

mport org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class MultipartFileUploadClient {

    public static void main(String[] args) throws IOException {
        uploadSingleFile();
        uploadMultipleFile();
    }

    private static void uploadSingleFile() throws IOException {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
        body.add("file", getTestFile());


        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
        String serverUrl = "http://localhost:8082/spring-rest/fileserver/singlefileupload/";
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.postForEntity(serverUrl, requestEntity, String.class);
        System.out.println("Response code: " + response.getStatusCode());
    }

    private static void uploadMultipleFile() throws IOException {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
        body.add("files", getTestFile());
        body.add("files", getTestFile());
        body.add("files", getTestFile());

        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
        String serverUrl = "http://localhost:8082/spring-rest/fileserver/multiplefileupload/";
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.postForEntity(serverUrl, requestEntity, String.class);
        System.out.println("Response code: " + response.getStatusCode());
    }

    public static Resource getTestFile() throws IOException {
        Path testFile = Files.createTempFile("test-file", ".txt");
        System.out.println("Creating and Uploading Test File: " + testFile);
        Files.write(testFile, "Hello World !!, This is a test file.".getBytes());
        return new FileSystemResource(testFile.toFile());
    }
}

 

 

server：

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.List;

@RestController
@RequestMapping("/fileserver")
public class FileServerResource {

    @RequestMapping(path = "/singlefileupload/", method = RequestMethod.POST)
    public ResponseEntity<String> processFile(@RequestParam("file") MultipartFile file) throws IOException {

        byte[] bytes = file.getBytes();

        System.out.println("File Name: " + file.getOriginalFilename());
        System.out.println("File Content Type: " + file.getContentType());
        System.out.println("File Content:\n" + new String(bytes));

        return (new ResponseEntity<>("Successful", null, HttpStatus.OK));
    }

    @RequestMapping(path = "/multiplefileupload/", method = RequestMethod.POST)
    public ResponseEntity<String> processFile(@RequestParam("files") List<MultipartFile> files) throws IOException {

        for (MultipartFile file : files) {
            byte[] bytes = file.getBytes();

            System.out.println("File Name: " + file.getOriginalFilename());
            System.out.println("File Content Type: " + file.getContentType());
            System.out.println("File Content:\n" + new String(bytes));
        }

        return (new ResponseEntity<>("Successful", null, HttpStatus.OK));
    }
}