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基于Sevlet的文件上传

2016-03-06 00:00 267 查看

摘要: 基于Sevlet的文件上传

这个是用两个文件实现的上传文件功能(Java),需要配置web.xml,依靠Apache的commons-fileupload包.
网页表单:
upload.html

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Upload</title>
</head>
<body>
<form method="post" action="upload" enctype="multipart/form-data">
<input type="file" name="u_file"/>
<input type="submit" value="Upload" />
</form>
</body>
</html>

Servlet如下:

upload.java

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
* 示例: 上传文件的Servlet,基于Commons Fileupload包.
*   下面的代码是接受从表单提交的数据并且保存到网站目录的upload文件夹.
* @author Leo
*/
public class upload extends HttpServlet {

@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
try {
List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(req);
for (int i = 0; i < items.size(); i++) {
FileItem item = items.get(i);
if (!item.isFormField()) {
//判断如果不是表单数据,也就是上传的文件数据.
item.write(new File(getServletContext().getRealPath("upload") + "\\" + item.getName()));
//反向写入文件.
}
}
} catch (Exception ex) {
Logger.getLogger(upload.class.getName()).log(Level.SEVERE, null, ex);
}
}
}

在web.xml中加入如下代码:

<servlet>
<servlet-name>upload</servlet-name>
<servlet-class>upload</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>upload</servlet-name>
<url-pattern>/upload</url-pattern>
</servlet-mapping>

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