servlet上传文件+上传进度显示

效果图

功能描述

1.使用jquery.form.js实现异步上传功能,并显示上传进度
2.servlet中保存上传的文件到指定文件夹
3.查看已经上传的文件
4.不同文件类型用不同图标显示

下载

https://github.com/houxinlin/ServletUploadFile

项目结构

实现过程

1.Servlet代码
MainServlet.java

MainServlet负责主界面信息,遍历已经上传的文件名,传递给jsp

@WebServlet("/MainServlet")
public class MainServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

    public MainServlet() {
        super();
    }


	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
	    String path = request.getContextPath();
	    String basePath = request.getScheme() + "://"
	            + request.getServerName() + ":" + request.getServerPort()
	            + path + "/";
	    
	    System.out.println(basePath);
		List<String> list =FilesUtils.listDirFiles(Config.UPLOAD_PATH);
		Map<String, String> map =new HashMap<>();
		for (String string : list) {
			map.put(string, string.substring(string.lastIndexOf(".")+1, string.length()) +"");
			
		}
		request.setAttribute("files", map);
		request.setAttribute("basePath", basePath);
		request.getRequestDispatcher("upload/index.jsp").forward(request, response);
		
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

UploadServlet.java
UploadServlet负责保存文件,如果文件有同名的,则更正

package com.houxinlin.servlets;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

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;

/**
 * Servlet implementation class UploadServlet
 */
@WebServlet("/UploadServlet")
@MultipartConfig
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;


	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		Part part =request.getPart("file");
		if(part!=null) {
			saveFile(part.getInputStream(),Config.UPLOAD_PATH,part.getSubmittedFileName());
		}

	}
	private void saveFile(InputStream is,String rootPath , String name) {
		try {
			String tempName =name;
			
			Path path =Paths.get(rootPath, tempName);
			int index=0;
			//如果文件存在
			if(Files.exists(path)) {
			
				while(Files.exists(path)) {
				
					name=(++index)+tempName;
					path =Paths.get(rootPath, name);
				}
				System.out.println("文件存在,文件名改正为----"+name);
			}
			System.out.println("保存---->"+rootPath +File.separatorChar+name);
			Files.copy(is, Paths.get(rootPath, name));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

辅助类
FilesUtils.java和Configa.java

package com.houxinlin.servlets;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Stream;

public class FilesUtils {
	public  static List<String> listDirFiles(String rootPath){
		List<String> list =new ArrayList<>();
		
		Stream<Path> paths;
		try {
			paths = Files.list(Paths.get(rootPath));
			Iterator<Path> item =paths.iterator();
			while (item.hasNext()) {
				Path path =item.next();
				if(!Files.isDirectory(path)) {
					list.add(path.getFileName()+"");
				}
			}
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return list;
	}
}

package com.houxinlin.servlets;

public class Config {
    public static final String UPLOAD_PATH="D:\\upload";
}

js

$("#add-file").click(function(param) {
	param.stopPropagation();
	param.stopPropagation();
	$("#upload-layout").css("display", "block")
})

$("#select-file-btn").click(function(param) {
	document.getElementById("file-input").click();
})
$("#file-input").change(function() {
	$("#select-file-btn label").html($("#file-input").val());
	$("#up-btn #progress-value").css("width", 0 +"%");
	$("#up-btn .title").html("上传")

});

$("#up-btn").click(function(param) {
	$(this).css({
		"width" : "87%",
	});
	upload();

})

function upload(param) {

	$("#upload-form").ajaxSubmit({
		success : function(param) {
			$("#up-btn .title").html("完成")
		},
		uploadProgress : function(event, position, total, percentComplete) {
			var width =(position/total)*100;
			$("#up-btn #progress-value").css("width", width +"%");
			$("#up-btn .title").html(+"%")
			var value =parseInt(width);
			$("#up-btn .title").html(value+"%")
		},
		fail : function(param) {
			$("#up-btn .title").html("失败")
		}
	})

}