HttpClient 3.1 文件上传

最新推荐文章于 2022-08-24 10:50:03 发布

dchjmichael

最新推荐文章于 2022-08-24 10:50:03 发布

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分类专栏： Web 文章标签： file constraints exception upload string service

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本文提供了一个使用Java实现的HTTP客户端文件上传示例，包括客户端和服务端代码。客户端使用了commons-codec等库来构建POST请求并上传文件，而服务端则利用commons-fileupload处理上传的文件。

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客户端：

需要commons-codec,commons-httpclient-3.1,commons-logging-1.1.1

	           String targetURL = null;// TODO 指定URL
		   File targetFile = null;// TODO 指定上传文件
		  
		   targetFile = new File("C:\\Users\\Administrator\\Desktop\\1.mp3");
		   targetURL = "http://localhost:8080/HttpClientDemo/test"; //servleturl
		   PostMethod filePost = new PostMethod(targetURL);
		  
		   try
		   {

		    //通过以下方法可以模拟页面参数提交
		    filePost.setParameter("name", "中文");
		    filePost.setParameter("pass", "1234");

		    Part[] parts = { new FilePart(targetFile.getName(), targetFile) };
		    filePost.setRequestEntity(new MultipartRequestEntity(parts,filePost.getParams()));
		    HttpClient client = new HttpClient();
		    client.getHttpConnectionManager().getParams().setConnectionTimeout(10000);
		    int status = client.executeMethod(filePost);
		    if (status == HttpStatus.SC_OK)
		    {
		     System.out.println("上传成功");
		     // 上传成功
		    }
		    else
		    {
		     System.out.println("上传失败");
		     // 上传失败
		    }
		   }
		   catch (Exception ex)
		   {
		    ex.printStackTrace();
		   }
		   finally
		   {
		    filePost.releaseConnection();
		   }

服务器端:

需要commons-fileupload-1.2.1.jar commons-io.jar

public class HttpClientTest extends HttpServlet {

	
	private String uploadPath = "D:\\temp"; // 上传文件的目录
    private String tempPath = "d:\\temp\\buffer\\"; // 临时文件目录
    File tempPathFile;
    
    public void init() throws ServletException {
        File uploadFile = new File(uploadPath);
        if (!uploadFile.exists()) {
            uploadFile.mkdirs();
        }
        File tempPathFile = new File(tempPath);
         if (!tempPathFile.exists()) {
            tempPathFile.mkdirs();
        }
     }
//	@Override
//	protected void service(HttpServletRequest request, HttpServletResponse response)
//			throws ServletException, IOException {
//
////		String name=request.getParameter("name");
////		System.out.println("name: "+name);
////		request.getRequestDispatcher("index.jsp").forward(request, response);
//		
//		
//
//	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException
{
   try 
   {
	   System.out.println("dopost");
    // Create a factory for disk-based file items
    DiskFileItemFactory factory = new DiskFileItemFactory();
    // Set factory constraints
    factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb
    factory.setRepository(tempPathFile);// 设置缓冲区目录
    // Create a new file upload handler
    ServletFileUpload upload = new ServletFileUpload(factory);
    // Set overall request size constraint
    upload.setSizeMax(10*1024*1024); // 设置最大文件尺寸，这里是10MB
    List<FileItem> items = upload.parseRequest(request);// 得到所有的文件
    Iterator<FileItem> i = items.iterator();
    while (i.hasNext())
    {
     FileItem fi = (FileItem) i.next();
     String fileName = fi.getName();
     System.out.println(fileName);
     if (fileName != null)
     {
      File fullFile = new File(fi.getName());
      File savedFile = new File(uploadPath, fullFile.getName());
      fi.write(savedFile);
     }
    }
    System.out.print("upload succeed");
   }
   catch (Exception e)
   {
    System.out.println(e.getMessage());
    // 可以跳转出错页面
    e.printStackTrace();
   }
}
	
}