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servlet3.0新特性测试，文件上传（1）

2014-07-30 12:35 302 查看

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

本文出自 “helloworld” 博客，请务必保留此出处http://lawrence16.blog.51cto.com/1908331/1532684

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