JavaWeb上传图片

最新推荐文章于 2024-06-03 23:10:45 发布

原创最新推荐文章于 2024-06-03 23:10:45 发布 · 856 阅读

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本文介绍了一个使用Java Servlet实现的简单文件上传示例。通过该示例，用户可以选择文件并将其上传到服务器上的指定目录。文章展示了完整的HTML表单及Servlet代码，并详细解释了如何处理上传过程中的各种操作。

<span style="font-size:18px;"><%@ 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>附件上传</title>
</head>
<body>
<form action="UploadAction" method="post" enctype="multipart/form-data">
<input type="file" name="filename">
<input type="submit" value="上传">

</form>
</body>
</html></span>

<span style="font-size:18px;">package servlet2;

import java.io.IOException;
import java.util.UUID;

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;
@WebServlet("/UploadAction")

//需要将文件上传到的目录!
@MultipartConfig(location="F:/明星照/")

public class UploadAction extends HttpServlet {
	private static final long serialVersionUID = 1L;
	public UploadAction(){
		super();
	}
	protected void doGet(HttpServletRequest request,HttpServletResponse response){
		response.getHeader("Content-Disposition");
		
	}
	
	
	protected void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException{
		//得到所上传的文件！
		Part p = request.getPart("filename");
		
		//得到表头信息。
		//Content-Disposition: form-data; name="filename"; filename="1.jpg"

		String header = p.getHeader("Content-Disposition");
		// form-data; name="filename"; filename="1.jpg"
//		System.out.println(header);
		
		//获取.jpg
		String sb = header.substring(header.lastIndexOf(".")).replace("\"","");
//		System.out.println(sb);
		
		String name = UUID.randomUUID().toString()+ sb;
		//将文件上传到指定目录下！
//		System.out.println(name);
		p.write(name);
		
		//解决乱码问题！最重要的是，要将文件上传到客户端网页中，须先将图片保存至本地中！利用p.write;
		response.setContentType("text/html;charset=utf-8");
		response.getWriter().write(String.format("<img src='%s'>", "/a/"+name));
		
		//<img src='/a/6efc617e-44b0-4c9a-8a01-593ec9205892.jpg'>
	}
	
	
	
	
	
	
	
	
	
	
	
	

}
</span>