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">
上传相片：<input type="file" name="photo"/><br><br>
<input type="submit" value="上传" 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);
}
}求指点
2 回答
慕九州4223353
TA贡献1条经验 获得超0个赞
String filename=header.substring(header.indexOf("filename=\"")+10, header.lastIndexOf("\""));
这一行报错空指针异常，怎么回事
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