7

我正在尝试将图像上传到 servlet，但在自动化测试期间每隔一段时间，它就会默默地失败。

大家知道这是什么原因造成的吗？

这是服务器上的代码：

    @ResponseBody
    @RequestMapping(method = RequestMethod.POST)
    public String upload(HttpServletRequest request) throws Exception {
     BufferedImage image = null;

     @SuppressWarnings("unchecked")
     List<FileItem> items = new ServletFileUpload(
           new DiskFileItemFactory()).parseRequest(request);

    Logger.log(LogLevel.INFO, "Upload contains " + items.size()
            + " items.");
    int i = 0;
    for (FileItem item : items) {
        Logger.log(LogLevel.INFO, "\tItem " + (i++) + ". Name:\t"
                + item.getName() + ", Type:\t" + item.getContentType());

        // File is of type "file"
        if (!item.isFormField()) {
            InputStream inputStream = null;
            try {
                inputStream = item.getInputStream();
                if (inputStream.available() == 0) {
                    Logger.log(LogLevel.WARN,
                            "Item shows file type, but no bytes are available");
                }
                image = ImageIO.read(inputStream);
                if (image != null) {
                    break;
                }
            } catch (Exception e) {
                Logger.log(LogLevel.ERROR,
                        "There was an error reading the image. "
                                + ExceptionUtils.getFullStackTrace(e));
                throw new Exception("image provided is not a valid image");
            } finally {
                if (inputStream != null) {
                    IOUtils.closeQuietly(inputStream);
                }
            }
        }
    }

     if (image == null) {
        Logger.log(LogLevel.ERROR, "Image was supposedly read correctly, but was null afterwards");
        throw new Exception("Image provided could not be read");
     }

     //do stuff with image
     ...
    }

这是测试：

 public void testImageUpload throws Exception {
    HttpPost httppost = new HttpPost("path/to/endpoint");
    File file=new File(imgLoc);
    FileBody bin = new FileBody(file);
    StringBody comment = new StringBody("Filename: " + file);

    MultipartEntity reqEntity = new MultipartEntity();
    reqEntity.addPart("upload-file", bin);
    reqEntity.addPart("comment", comment);
    httppost.setHeader("Accept", "application/json");
    httppost.setHeader("Connection","Keep-Alive");
    httppost.setEntity(reqEntity);
    HttpResponse response =testClient.getClient().execute(httppost);
    imgResponse=response.getStatusLine().toString();
    System.out.println(imgResponse);
    BufferedReader reader = new BufferedReader(
           new InputStreamReader(response.getEntity().getContent()));
    String line;
    while ((line = reader.readLine()) != null){
       output = output + " " +line;}
    System.out.println("Image Response: "+output);
}

这是服务器失败时的输出：

2013/10/02 05-53-32,287::LOG:INFO[com.example#upload:L130 -- Upload contains 2 items.]
2013/10/02 05-53-32,288::LOG:INFO[com.example#upload:L133 --        Item 0. Name:   Dog.jpg, Type:  application/octet-stream]
2013/10/02 05-53-32,288::LOG:WARN[com.example#upload:L140 -- Item shows file type, but no bytes are available]
2013/10/02 05-53-32,289::LOG:INFO[com.example#upload:L133 --        Item 1. Name:   null, Type:     text/plain; charset=ISO-8859-1]
2013/10/02 05-53-32,290::LOG:ERROR[com.example#upload:L159 -- Image was supposedly read correctly, but was null afterwards]

我们从图片上传中捕获异常，并将响应代码 422 发送回客户端，因此在测试中，我们得到imgResponse==422 ，这是一个失败案例。

注意：这只发生在你运行测试的时候。

4

6 回答 6

2

以下是使用 Apache Commons FileUpload 进行文件上传的分步配置：

1.为以下组件添加依赖jar。这是maven依赖项：

pom.xml

 <dependencies>
     <!-- Spring 3 MVC  -->
     <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webmvc</artifactId>
         <version>3.2.4.RELEASE</version>
     </dependency>
     <!-- Apache Commons file upload  -->
     <dependency>
         <groupId>commons-fileupload</groupId>
         <artifactId>commons-fileupload</artifactId>
         <version>1.2.2</version>
     </dependency>
     <!-- Apache Commons IO -->
     <dependency>
         <groupId>org.apache.commons</groupId>
         <artifactId>commons-io</artifactId>
         <version>1.3.2</version>
     </dependency>
     <!-- JSTL for c: tag -->
     <dependency>
         <groupId>jstl</groupId>
         <artifactId>jstl</artifactId>
         <version>1.2</version>
     </dependency>
 </dependencies>

如果您不使用 maven，请从 maven 存储库在线下载相应的 jar。

2. 创建 FileUploadForm 模型

文件上传表单.java

import java.util.List;
import org.springframework.web.multipart.MultipartFile;

public class FileUploadForm {

    private List<MultipartFile> files;

    //Getter and setter methods
}

3. 将解析器添加到 MVC 配置文件

<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    <!-- one of the properties available; the maximum file size in bytes -->
    <property name="maxUploadSize" value="100000"/>
</bean>

4.编写文件上传控制器

文件上传控制器.java

@Controller
public class FileUploadController {
     
    @RequestMapping(value = "/show", method = RequestMethod.GET)
    public String displayForm() {
        return "file_upload_form";
    }
     
    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String save(
            @ModelAttribute("uploadForm") FileUploadForm uploadForm,
                    Model map) {
         
        List<MultipartFile> files = uploadForm.getFiles();
 
        List<String> fileNames = new ArrayList<String>();
         
        if(null != files && files.size() > 0) {
            for (MultipartFile multipartFile : files) {
 
                String fileName = multipartFile.getOriginalFilename();
                fileNames.add(fileName);
                //Handle file content - multipartFile.getInputStream()
 
            }
        }
         
        map.addAttribute("files", fileNames);
        return "file_upload_success";
    }
}

5.编写jsp视图

file_upload_form.jsp

<html>
<head>
    <title>Spring MVC Multiple File Upload</title>
<script
src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script>
$(document).ready(function() {
    //add more file components if Add is clicked
    $('#addFile').click(function() {
        var fileIndex = $('#fileTable tr').children().length - 1;
        $('#fileTable').append(
                '<tr><td>'+
                '   <input type="file" name="files['+ fileIndex +']" />'+
                '</td></tr>');
    });

});
</script>
</head>
<body>
<h1>Spring Multiple File Upload example</h1>

<form method="post" action="save.html"
        **enctype="multipart/form-data"**>

    <p>Select files to upload. Press Add button to add more file inputs.</p>

    <input id="addFile" type="button" value="Add File" />
    <table id="fileTable">
        <tr>
            <td><input name="files[0]" type="file" /></td>
        </tr>
        <tr>
            <td><input name="files[1]" type="file" /></td>
        </tr>
    </table>
    <br/><input type="submit" value="Upload" />
</form>
</body>
</html>

参考：http ://docs.spring.io/spring/docs/3.2.4.RELEASE/spring-framework-reference/html/mvc.html#mvc-multipart

于 2013-10-16T06:00:15.867 回答
0

我以前在两种情况下遇到过这种情况。一次是我的磁盘空间不足，另一次是我在做一些负载测试。

如果您查看它的工作原理页面，您可以使该工具将项目转储到磁盘或将它们保存在内存中。在一种情况下，我在测试期间填满了驱动器，另一种情况下我将项目保存在内存中，但负载超出了我的内存限制。

你是怎么设置的？您用于测试的图像有多大？你在测试期间上传了多少次？有了这些信息，我应该能够提供更多帮助。

于 2013-10-16T14:46:53.650 回答
0

这段代码目前在我的网站上使用，就像一个魅力：

package com.example;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
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.multipart.MultipartFile;

@Controller
@RequestMapping("/api/media")
public class ImageRestService {

    private static final Logger LOG = LoggerFactory.getLogger(ImageRestService.class);

    @RequestMapping(value = "/uploadtemp", method = RequestMethod.POST)
    public String upload(@RequestParam(value = "image") MultipartFile image) {
        try {
            BufferedImage bufferedImage = ImageIO.read(image.getInputStream());
            // process image here
        } catch (IOException e) {
            LOG.error("failed to process image", e);
            return "failure/view/name";
        }
        return "success/view/name";
    }

}
于 2013-10-16T21:51:07.983 回答
0

您的内容类型似乎是 application/octet-stream。请在您的请求中添加以下标头并试一试

("Content-Type", "multipart/form-data");
于 2013-10-02T15:14:45.027 回答
0

您正在使用InputStream#available。正如文档所述，这是可以从流中读取而不阻塞的字节数。现在，TCP 输入流中可用的字节数取决于数据包的大小以及您的请求如何在其中分割（以及更多其他因素）。

如果您的意图是始终完整地读取流，请忘记该available()方法，只需将其读出直到流结束即可。

于 2013-10-15T12:25:52.710 回答
-1

也许项目列表的顺序不固定（取决于时间？）。你的代码

if (image != null) {
    break;
}

退出循环而不是尝试下一部分。在您声明的评论中，我们遍历文件，直到我们可以解析一个，它应该是

if (image != null) {
    continue;
}

然后。

于 2013-10-17T12:49:42.877 回答