文件上传Servlet示例-优快云博客

本文链接：https://blog.youkuaiyun.com/lcathm/article/details/48085085

package sevlet;

import java.io.IOException;
import java.io.PrintWriter;
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;

import org.apache.commons.lang.StringUtils;

/**
 * <form action="" method="post" enctype="multipart/form-data">
 * <input type="file" name="filename"/>
 * ------WebKitFormBoundarylAJMvADGM2XQONHa
 *Content-Disposition: form-data; name="filename"; filename="http基础知识.doc"
 *Content-Type: application/msword


 *------WebKitFormBoundarylAJMvADGM2XQONHa
 *Content-Disposition: form-data; name="submit"

 *提交
 *------WebKitFormBoundarylAJMvADGM2XQONHa--
 * @author lcathm
 *
 */
@MultipartConfig(location="D:/tmp/", maxFileSize=1024*1024*10)
@WebServlet(name="PartBodyContentServlet", urlPatterns={"/upload.do"},loadOnStartup=0)
public class PartBodyContent extends HttpServlet{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
		//设置处理编码
		request.setCharacterEncoding("UTF-8");
		Part part = request.getPart("filename");
		//获取文件名
		String fileName = getFilename(part);
		part.write(fileName);
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE html>");
		out.println("<html>");
		out.println("<body>");
		out.println("上传成功");
		out.println("</body>");
		out.println("</html>");
		out.flush();
		out.close();
		
	}
	
	//获取文件名
	private String getFilename(Part part) {
		if (part == null) {
			return null;
		}
		String fileName = part.getHeader("content-disposition");
		if (StringUtils.isBlank(fileName)) {
			return null;
		}
		return StringUtils.substringBetween(fileName, "filename=\"","\"");
	}
}

<pre name="code" class="java">package sevlet;

import java.io.IOException;
import java.io.PrintWriter;
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;

import org.apache.commons.lang.StringUtils;

/**
 * <form action="" method="post" enctype="multipart/form-data">
 * <input type="file" name="filename"/>
 * ------WebKitFormBoundarylAJMvADGM2XQONHa
 *Content-Disposition: form-data; name="filename"; filename="http基础知识.doc"
 *Content-Type: application/msword


 *------WebKitFormBoundarylAJMvADGM2XQONHa
 *Content-Disposition: form-data; name="submit"

 *提交
 *------WebKitFormBoundarylAJMvADGM2XQONHa--
 * @author lcathm
 *
 */
@MultipartConfig(location="D:/tmp/", maxFileSize=1024*1024*10)
@WebServlet(name="PartBodyContentsServlet", urlPatterns={"/uploads.do"},loadOnStartup=0)
public class PartBodyContents extends HttpServlet{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
		//设置处理编码
		request.setCharacterEncoding("UTF-8");
		request.getParts();
		for(Part part :request.getParts()) {
			if (part.getName().startsWith("filenam")) {
				String filename = getFilename(part);
				part.write(filename);
			}
		}
		
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE html>");
		out.println("<html>");
		out.println("<body>");
		out.println("上传成功");
		out.println("</body>");
		out.println("</html>");
		out.flush();
		out.close();
		
	}
	
	//获取文件名
	private String getFilename(Part part) {
		if (part == null) {
			return null;
		}
		String fileName = part.getHeader("content-disposition");
		if (StringUtils.isBlank(fileName)) {
			return null;
		}
		return StringUtils.substringBetween(fileName, "filename=\"","\"");
	}
}

servlet文件上传