servlet3.0新特性测试,文件上传(1)

servlet代码

@MultipartConfig()
@WebServlet(name = "test", urlPatterns = "*.do", initParams = { @WebInitParam(name = "", value = "") }, loadOnStartup = 3)
public class TestServlet3 extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		process(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		process(req, resp);
	}

	private void process(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		Part p = req.getPart("f");
		BufferedReader br = new BufferedReader(new InputStreamReader(
				p.getInputStream()));
		String line = null;
		while ((line = br.readLine()) != null) {
			System.out.println(line);
		}
	}

}

非常简单的代码,读取上传文件内容,然后输出到控制台。

页面代码

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

<title>Insert title here</title>

</head>

<body>

<form action="a.do" enctype="multipart/form-data">

<input type="file" name="f" >

<input type="submit" value="submit">

</form>

</body>

</html>

问题来了,提交报错

严重: Servlet.service() for servlet [test] in context with path [/tomcat7test] threw exception [org.apache.tomcat.util.http.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/form-data stream, content type header is null] with root cause
org.apache.tomcat.util.http.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/form-data stream, content type header is null
	at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:806)
	at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:261)

后来查了查资料,form表单必须要设置method=post和enctype=multipart/form-data


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