java创建上传文件接口并使用HTTP测试-Toy模板网

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1.创建上传文件接口

备注: 使用jersey框架

@Path("/upload")
@Controller
public class UploadFileController {

	@Path("/files")
	@POST
	@Consumes(MediaType.MULTIPART_FORM_DATA)
	@Produces(MediaType.APPLICATION_JSON)
	public Response uploadFiles2(@FormDataParam("data") String data,
			@FormDataParam("files") List<FormDataBodyPart> bodyParts,
			@FormDataParam("files") FormDataContentDisposition fileDispositions,
			@FormDataParam("file") InputStream fileInputStream,
			@FormDataParam("file") FormDataContentDisposition fileDisposition) {
		// 处理多文件
		for(FormDataBodyPart fdsp: bodyParts) {
			BodyPartEntity bodyPartEntity = (BodyPartEntity) fdsp.getEntity();
			String fileName = bodyParts.get(i).getContentDisposition().getFileName();
			InputStream inputStream = bodyPartEntity.getInputStream();
			//TODO 处理文件
		}

		// 处理单文件
		// 根据fileInputStream输入流处理单文件内容

		return "OK";
	}
}

2.前端代码调用上传文件接口

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>上传文件前端代码</title>
</head>
<body>
	<h2>上传文件</h2>
	<form action="/upload/files" enctype="multipart/form-data" method="post">
		<label>选择多文件上传</label><input type= "file" name="files" multiple /> <br/><br/>
		<label>选择单文件上传</label><input type= "file" name="file" /> <br/><br/>
		<label>其他参数</label> <input name="data" maxlength="100"/> <br/><br/>
		<input type="submit" title="上传"/>
	</form>
</body>
</html>

2.后端调用上传文件接口

2.1.使用HttpURLConnection上传文件

2.1.1.上传本地文件

参考链接: Jersey (JAX-RS) multiple files upload example文章来源地址https://www.toymoban.com/news/detail-507610.html

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;

public class HttpPostMultipart {
    private final String boundary;
    private static final String LINE = "\r\n";
    private HttpURLConnection httpConn;
    private String charset;
    private OutputStream outputStream;
    private PrintWriter writer;
    
    public HttpPostMultipart(String requestURL, String charset, Map<String, String> headers) throws IOException {
        this.charset = charset;
        boundary = UUID.randomUUID().toString();
        URL url = new URL(requestURL);
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setUseCaches(false);
        httpConn.setDoOutput(true);
        httpConn.setDoInput(true);
        httpConn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        if (headers != null && headers.size() > 0) {
            Iterator<String> it = headers.keySet().iterator();
            while (it.hasNext()) {
                String key = it.next();
                String value = headers.get(key);
                httpConn.setRequestProperty(key, value);
            }
        }
        outputStream = httpConn.getOutputStream();
        writer = new PrintWriter(new OutputStreamWriter(outputStream, charset), true);
    }

    public void addFormField(String name, String value) {
        writer.append("--" + boundary).append(LINE);
        writer.append("Content-Disposition: form-data; name=\"" + name + "\"").append(LINE);
        writer.append("Content-Type: text/plain; charset=" + charset).append(LINE);
        writer.append(LINE);
        writer.append(value).append(LINE);
        writer.flush();
    }

    public void addFilePartLocalFile(String fieldName, File uploadFile)
            throws IOException {
        String fileName = uploadFile.getName();
        writer.append("--" + boundary).append(LINE);
        writer.append("Content-Disposition: form-data; name=\"" + fieldName + "\"; filename=\"" + fileName + "\"").append(LINE);
        writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(fileName)).append(LINE);
        writer.append("Content-Transfer-Encoding: binary").append(LINE);
        writer.append(LINE);
        writer.flush();

        FileInputStream inputStream = new FileInputStream(uploadFile);
        byte[] buffer = new byte[4096];
        int bytesRead = -1;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        outputStream.flush();
        inputStream.close();
        writer.append(LINE);
        writer.flush();
    }
    
    /**
    * 上传内容
    */
	public void addFilePartContent(String fieldName, String fileName, String content)
            throws IOException {
        writer.append("--" + boundary).append(LINE);
        writer.append("Content-Disposition: form-data; name=\"" + fieldName + "\"; filename=\"" + fileName + "\"").append(LINE);
        writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(fileName)).append(LINE);
        writer.append("Content-Transfer-Encoding: binary").append(LINE);
        writer.append(LINE);
        writer.flush();
        writer.append(content);
        writer.append(LINE);
        writer.flush();
    }

    public String finish() throws IOException {
        String response = "";
        writer.flush();
        writer.append("--" + boundary + "--").append(LINE);
        writer.close();

        int status = httpConn.getResponseCode();
        if (status == HttpURLConnection.HTTP_OK) {
            ByteArrayOutputStream result = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int length;
            while ((length = httpConn.getInputStream().read(buffer)) != -1) {
                result.write(buffer, 0, length);
            }
            response = result.toString(this.charset);
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }
        return response;
    }
	
	public static void testUploadFileLocalFile() {
		try {
		    // 设置header, 里面可以放权限Authorization
		    Map<String, String> headers = new HashMap<>();
		    headers.put("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36");
		    HttpPostMultipart multipart = new HttpPostMultipart("http://localhost:8080/upload/files", "utf-8", headers);
		    multipart.addFormField("data", "1234567");
		    multipart.addFilePart("file", new File("/home/user/test.png"));
		    System.out.println(multipart.finish());
		} catch (Exception e) {
		    e.printStackTrace();
		}
	}
	
	public static void testUploadFileContent() {
		try {
		    // 设置header, 里面可以放权限Authorization
		    Map<String, String> headers = new HashMap<>();
		    headers.put("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36");
		    HttpPostMultipart multipart = new HttpPostMultipart("http://localhost:8080/upload/files", "utf-8", headers);
		    multipart.addFormField("data", "1234567");
		    multipart.addFilePartContent("file", "test.xml", "<?xml version=\"1.0\" encoding=\"UTF-8\"?><test name=\"test\" value=\"1\"></test>"));
		    System.out.println(multipart.finish());
		} catch (Exception e) {
		    e.printStackTrace();
		}
	}
	
	// 测试上传
	public static void main(String[] args) {
		//测试上传本地文件
		testUploadFileLocalFile();
		//测试上传文件具体内容
		testUploadFileContent();
	}
}