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  • 文件上传下载与Excel、数据表数据之间的转换

    文章目录

    文件上传下载与Excel、数据表数据之间的转换

    文件上传界面：

    <%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!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>上传记录页面</title>
</head>
<body>
	<h3>上传Excel文档</h3>
	<h4>注意：电子表只能为"*.xls",并且表中有左到右，各字段信息依次为：</h4>
	姓名,性别,单位,手机,电话,电子邮箱,地址
	<s:form action="/card/upload" method="post"
		enctype="multipart/form-data">
		<s:file name="file" label="提交文件"></s:file>
		<br>
		<br>
		<s:submit value="提交"></s:submit>
	</s:form>

</body>
</html>

    文件上传业务处理（UploadAction）：

    package com.edu.action.card;

import java.io.File;

import javax.servlet.ServletContext;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

import com.edu.db_util.DbToExcel;
import com.opensymphony.xwork2.ActionSupport;
@Controller("com.edu.action.card.UploadAction")
@Scope("prototype")
@Namespace("/card")
@ParentPackage("struts-default")

public class UploadAction extends ActionSupport {
	private static final long serialVersionUID = 1L;
    /**
     * 上传单个文件方式，必须设置下面的3个属性，File属性名与提交页面的属性名一致，
     * 其他两项必须用该属性名开始并且名称
     */
	private File file;//上传文件对象
	private String fileContentType;//上传文件内容类型
	private String fileFileName;//上传文件名

	public File getFile() {
		return file;
	}
	public void setFile(File file) {
		this.file = file;
	}
	public String getFileContentType() {
		return fileContentType;
	}
	public void setFileContentType(String fileContentType) {
		this.fileContentType = fileContentType;
	}
	public String getFileFileName() {
		return fileFileName;
	}
	public void setFileFileName(String fileFileName) {
		this.fileFileName = fileFileName;
	}
	@Action( //表示请求的Action及处理方法
			value="upload", 		   
			results={@Result(name="success",location="/find",type="redirectAction")}
		)	
	public String upload() throws Exception {	
		//获取服务器容器对象
		ServletContext servletContext = ServletActionContext.getServletContext();
		//获取实际存放上传文件的文件夹（项目根目录下的文件夹upload），若不存在，自动创建该文件夹
		String dir = servletContext.getRealPath("/upload");
		System.out.println(dir);		
		File saveFile=new File(dir,fileFileName);
		FileUtils.copyFile(file,saveFile);
		DbToExcel.excelToDb(dir+"/"+fileFileName, "Card", "(name,sex,department,mobile,phone,email,address)", 7);
		return "success";
	}
}

    文档下载按钮：

    按钮：
<input type="button" value="导入名片" onclick="upload()" />
JS：
 function download(){location.href="<%=basePath%>card/download";}

    文档下载业务处理（DownLoadAction）：

    package com.edu.action.card;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

import com.edu.db_util.DbToExcel;
import com.opensymphony.xwork2.ActionSupport;
@Controller("com.edu.action.card.DownLoadAction")
@Scope("prototype")
@Namespace("/card")
@ParentPackage("struts-default")

public class DownLoadAction extends ActionSupport {
	private static final long serialVersionUID = 1L;	
	
   //以下4个属性必须提供getter方法
	private String contentType;//指定下载文件的类型,默认值为 text/plain
	private long contentLength;//被下载的文件的大小，以字节为单位
	// 属性：contentDisposition：指定文件下载的处理方式，当为attachment（附件方式）会弹出文件保存对话框，是默认方式，
	// 其格式是attachment;filename="${fileName}
	private String contentDisposition;//指定下载文件的下载方式，并指定保存文件的默认文件名
	private InputStream inputStream;//Action 中提供的文件的输入流。默认值为 inputStream
	
	private String fileName="名片.xls";  //指定下载的文件名	
	
	public String getContentType() {
		return contentType;
	}

	public long getContentLength() {
		return contentLength;
	}

	public String getContentDisposition() {
		return contentDisposition;
	}

	public InputStream getInputStream() {
		return inputStream;
	}
	
	
	@Action( //表示请求的Action及处理方法
			value="download", 			
			results={@Result(name="success",type="stream")}
		)	

	public String executeDownLoad() throws Exception {
		String[] fieldList={"id","name","sex","department","mobile","phone","email","address","flag"};
		String[] titles={"序号","姓名","性别","单位","手机","电话","电子邮箱","地址","备注"};		
		String file="名片.xls";
		HttpSession session=ServletActionContext.getRequest().getSession();
		String condition=(String)session.getAttribute("condition");
		String order=(String)session.getAttribute("order");		
		String sql="";
		if (condition != null && !condition.equals("")) {
			sql = sql + " (name like '%" + condition + "%'";
			sql = sql + " or sex like '%" + condition + "%'";
			sql = sql + " or department like '%" + condition + "%'";
			sql = sql + " or mobile like '%" + condition + "%'";
			sql = sql + " or phone like '%" + condition + "%'";
			sql = sql + " or email like '%" + condition + "%'";
			sql = sql + " or address like '%" + condition + "%')";
		}	
		
		
		//确定各个成员变量的值，注意，这些值也可以在配置文件中配置，但一般在这里配置
		 contentType = "application/octet-stream";//指定为任意类型的文件
		//指定下载后要保存的默认文件名,并通过编码转化，使之支持汉字文件名
	     String name=java.net.URLEncoder.encode(fileName, "UTF-8");
		 contentDisposition = "attachment;filename="+name;
		 
		 ServletContext servletContext =ServletActionContext.getServletContext();
		 
		 String fileName2 = servletContext.getRealPath("/download/"+file);	 
		File downloadfile=new File(fileName2);
		if(!downloadfile.exists()){
			System.out.println("不存在");
			downloadfile.getParentFile().mkdirs();
		}
		
		 DbToExcel.dBToExcel("Card", fieldList, titles, sql, order, fileName2);
		
		 inputStream = new FileInputStream(fileName2);
		 contentLength = inputStream.available();		
		 return SUCCESS;	
	}
}

    Excel与数据表数据之间的转换：

    package com.edu.db_util;

import java.io.File;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import jxl.Sheet;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

public class DbToExcel {
	/**
	 * 该方法实现将电子表中的数据导入对应的数据库内
	 * 
	 * @param excelpath:电子表路径
	 * @param table    ：数据库数据表名
	 * @param fieldList   ：数据库字段名串，在插入数据库中，各字段信息，并且用逗号间隔，
	 * @param columnCount    ：要添加的字段的个数
	 * @throws Exception
	 */
	public static void excelToDb(String excelpath, String table,
			String fieldList, int columnCount) throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		Workbook workbook = null;
		Sheet sheet = null;
		//conn = JdbcPoolUtils.getConnection();
		conn=null;
		String sql = "insert into " + table + " " + fieldList + "  values (";
		for (int i = 1; i < columnCount; i++) {
			sql += "?,";
		}
		sql += "?) ";
		System.out.println(sql);
		ps = conn.prepareStatement(sql);
		workbook = Workbook.getWorkbook(new File(excelpath));
		sheet = workbook.getSheet(0);
		int r = sheet.getRows();
		for (int i = 1; i < r; i++) {
			for (int j = 0; j < columnCount; j++)
				ps.setString(j + 1, sheet.getCell(j, i).getContents());
			ps.addBatch();
		}
		ps.executeBatch();
		workbook.close();
		//JdbcPoolUtils.close(null, ps, conn);
	}

	/**
	 * 该方法实现将数据库中的某数据表数据形成电子表Excel
	 * 
	 * @param table
	 *            :数据表名字
	 * @param fieldList
	 *            ：数据表字段名，采用字符串数组依次存放
	 * @param titles
	 *            ：所形成的电子表表头字段信息，采用字符串数组存放
	 * @param condition
	 *            ：查询数据库的条件，将满足该条件的记录存放到电子表中
	 * @param order
	 *            ：排序字段与排序方式（ascdesc）
	 * @param file
	 *            ：电子表名字
	 * @throws Exception
	 */
	public static void dBToExcel(String table, String[] fieldList,
			String[] titles, String condition, String order, String file)
			throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		WritableWorkbook wwb = null;
		WritableSheet ws = null;

		//conn = JdbcPoolUtils.getConnection();
		conn=null;
		String flist = "";
		int fl = fieldList.length;
		for (int i = 0; i < fl - 1; i++) {
			flist += fieldList[i] + ",";
		}
		flist += fieldList[fieldList.length - 1];
		String sql = "select " + flist + " from " + table + "  where 1=1 ";
		if (condition != null && !condition.equals("")) {
			sql = sql + " and " + condition;
		}
		if (order != null && !order.equals("") ) {
			sql = sql + " order by " + order;
		}
		ps = conn.prepareStatement(sql);
		ResultSet rs = ps.executeQuery();
		wwb = Workbook.createWorkbook(new File(file));
		ws = wwb.createSheet("sheet1", 0);

		for (int i = 0; i < fl; i++) {
			ws.addCell(new Label(i, 0, titles[i]));
		}
		int count = 1;
		while (rs.next()) {
			for (int j = 0; j < fl; j++) {
				ws.addCell(new Label(j, count, rs.getString(j + 1)));
			}
			count++;
		}
		wwb.write();

		if (wwb != null)
			wwb.close();
		//JdbcPoolUtils.close(null, ps, conn);

	}

}
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  • 原文地址：https://www.cnblogs.com/study-hard-forever/p/14387277.html
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