java后台模拟multipart/form-data请求上传文件和普通文本的两种方法

最新推荐文章于 2025-09-22 09:14:58 发布

原创最新推荐文章于 2025-09-22 09:14:58 发布 · 1.9k 阅读

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#java #spring boot #maven #upload

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本文介绍了使用Java后台模拟multipart/form-data请求来上传文件和普通文本的两种方法，包括从本地文件读取和使用文件流的操作。

本地文件

import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.core.io.FileSystemResource;
import java.io.File;

	RestTemplate restTemplate = new RestTemplate();
	String apiUrl = "http://192.91.4.213:9092/data_dump/v1/lead";
    HttpHeaders headers = new HttpHeaders();
    MultiValueMap<String, Object> map= new LinkedMultiValueMap<>();
    headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
    String filePath = "D:\\\\download\\XZZC.dump";
    FileSystemResource resource = new FileSystemResource(new File(filePath)); 
    map.add("ip", url);
    map.add("port",port);
    map.add("user",username);
    map.add("password",password);
    map.add("dbname",databasename);
    map.add("datafile",resource);
 	String result = restTemplate.postForObject(apiUrl, map, String.class);

文件流

	String filePostUrl = "http://192.91.4.213:9092/data_dump/v1/lead";      
	HttpPost httppost = new HttpPost(filePostUrl);
	HttpClient client = new DefaultHttpClient();
	MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();	
	try {
		entityBuilder.addBinaryBody("datafile", file.getInputStream(),
					ContentType.DEFAULT_BINARY, file.getName());
		entityBuilder.addTextBody("ip", url,ContentType.TEXT_PLAIN.withCharset("UTF-8"));
		entityBuilder.addTextBody("port", port,ContentType.TEXT_PLAIN.withCharset("UTF-8"));
		entityBuilder.addTextBody("user", username,ContentType.TEXT_PLAIN.withCharset("UTF-8"));
		entityBuilder.addTextBody("password", password,ContentType.TEXT_PLAIN.withCharset("UTF-8"));
		entityBuilder.addTextBody("dbname", databasename,ContentType.TEXT_PLAIN.withCharset("UTF-8"));
		httppost.setEntity(entityBuilder.build());
		HttpResponse response = client.execute(httppost);
		if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
			String result = EntityUtils.toString(response.getEntity(), "UTF-8");
			String resultCode =	DataUtils.getResultCode(result);
		}else {
	        return resultBeanBuilder.state(new ResultBeanState(0,"error","数据库还原失败")).data(deploymentInstance).build();
		}
	} catch (IOException e) {
		e.printStackTrace();
	}

MultipartEntityBuilder 类需要的maven依赖是
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.3.6</version>
</dependency>