upload.jsp:
<%@?page?language="java"?contentType="text/html;?charset=utf-8"
????pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert?title?here</title>
</head>
<body>
<form?action="upload2"?method="post"?enctype="multipart/form-data">
上傳相片：<input?type="file"?name="photo"/><br><br>
<input?type="submit"?value="上傳"?name="upload"/>
</form>
</body>
</html>
upload2.java:
package?picture;
import?java.io.IOException;
import?javax.servlet.ServletException;
import?javax.servlet.annotation.MultipartConfig;
import?javax.servlet.annotation.WebServlet;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
import?javax.servlet.http.Part;
@MultipartConfig(location="E:/COURSE/")
@WebServlet("/upload2")
public?class?upload2?extends?HttpServlet?{
private?static?final?long?serialVersionUID?=?1L;
???????
????public?upload2()?{
????????super();
????}
protected?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{
request.setCharacterEncoding("utf-8");
Part?part=request.getPart("photo");
String?filename=getFilename(part);
part.write(filename);
}
private?String?getFilename(Part?part)?{
String?header=part.getHeader("Content-Disposition");
String?filename=header.substring(header.indexOf("filename=\"")+10,?header.lastIndexOf("\""));
return?filename;
}
protected?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{
//?TODO?Auto-generated?method?stub
doGet(request,?response);
}
}求指點
2 回答
慕九州4223353
TA貢獻1條經驗 獲得超0個贊
?String?filename=header.substring(header.indexOf("filename=\"")+10,?header.lastIndexOf("\""));
這一行報錯空指針異常，怎么回事
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