最近做项目的时候遇到了这样一个问题，微信内置的浏览器把下载这个功能屏蔽了。唉，，，折腾了一天，从网上各种找资料，但是给的解决方案都不是我想要的(也不知道谁复制的谁的，基本都一样)。

在快下班的时候，我请教了一位朋友，我问他是怎么解决的，他说：很简单，发邮件就可以了。

为方便大家开发，下面附上代码。此代码包括发送邮件和生成表格。

/**

* @author h_debug

* @date 2018年7月21日 上午9:13:25

* @Copyright: 2018 . All rights reserved.

* @version V1.0

*/

import java.io.ByteArrayInputStream;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.security.GeneralSecurityException;

import java.util.Properties;

import javax.activation.DataHandler;

import javax.activation.DataSource;

import javax.mail.Authenticator;

import javax.mail.BodyPart;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.Multipart;

import javax.mail.PasswordAuthentication;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeBodyPart;

import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeMultipart;

import javax.mail.util.ByteArrayDataSource;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFFont;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.util.CellRangeAddress;

import org.apache.tomcat.util.http.fileupload.ByteArrayOutputStream;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import com.sun.mail.util.MailSSLSocketFactory;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

@RequestMapping("/sendmail")

@Controller

public class SendMailUtil {

/*

* 发送邮件到指定邮箱

*/

@SuppressWarnings("deprecation")

@RequestMapping(value = "/moremail", method = RequestMethod.POST)

public static void send(HttpServletRequest request,@RequestParam(value = "emails", required = true) String emails,@RequestParam(value = "contents", required = true) String contents,@RequestParam(value = "mores", required = true) String mores,HttpServletResponse resp) throws Exception{

// // 未填写邮箱地址的供货商列表

// List vendorsList = new ArrayList();

String path = request.getRealPath("WEB-INF/excel/aaa.xls");

ByteArrayOutputStream byteOS = new ByteArrayOutputStream();

@SuppressWarnings("resource")

FileInputStream fis = new FileInputStream(path);

byte[] by = new byte[512];

int t = fis.read(by,0,by.length);

while(t>0){ byteOS.write(by, 0, 512); //这里别写成t，写够512，呵呵，SB的方法对付SB的java API

t = fis.read(by,0,by.length);

}

byteOS.close();

InputStream byteIS = new ByteArrayInputStream(byteOS.toByteArray());

HSSFWorkbook workBook = new HSSFWorkbook(byteIS);

// 获取第一个sheet页

HSSFSheet sheet=workBook.getSheetAt(0);

/******************************设置表头*****************************/

String sheetTitle = contents+"--进出库详情";

// 单元格合并

// 四个参数分别是：起始行，起始列，结束行，结束列

sheet.addMergedRegion(new CellRangeAddress(0,1,0,4));

// 创建表头并赋值

HSSFRow rowTitle = sheet.createRow(0);

HSSFCell cellTitle = rowTitle.createCell(0);

cellTitle.setCellValue(sheetTitle);

// 创建剧中样式

HSSFCellStyle cellStyle = workBook.createCellStyle();

// 垂直居中

cellStyle.setAlignment(HSSFCellStyle.VERTICAL_CENTER);

// 水平居中

cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);

// 创建字体

HSSFFont cellFont = workBook.createFont();

cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

cellFont.setFontHeight((short) 300);

cellStyle.setFont(cellFont);

cellTitle.setCellStyle(cellStyle);

/**********************遍历物料，并将物料列表显示到模板中，作为邮件的附件***********************/

JSONArray jsonss=JSONArray.fromObject(mores);

// 行号下标，从0开始

int rowIndex = 2 ;

for(int j=0;j

rowIndex++;

// 创建行

HSSFRow row=sheet.createRow(rowIndex);

// 根据下标创建单元格

// 设置物料序号

row.createCell(0).setCellValue(j+1);

// 设置IMPA编码

if(null != jsonss.getJSONObject(j).getString("sname")){

row.createCell(1).setCellValue(jsonss.getJSONObject(j).getString("sname"));

}else {

row.createCell(1).setCellValue("");

}

// 设置物料中文名称

if(null != jsonss.getJSONObject(j).getString("conts")){

row.createCell(2).setCellValue(jsonss.getJSONObject(j).getString("conts"));

}else {

row.createCell(2).setCellValue("");

}

// 设置物料英文名称

if(null != jsonss.getJSONObject(j).getString("iconts")){

row.createCell(3).setCellValue(jsonss.getJSONObject(j).getString("iconts"));

}else {

row.createCell(3).setCellValue("");

}

}

ByteArrayOutputStream baos = new ByteArrayOutputStream();

workBook.write(baos);

baos.flush();

byte[] bt = baos.toByteArray();

InputStream is = new ByteArrayInputStream(bt, 0, bt.length);

baos.close();

boolean s = sendMail(sheetTitle, emails, "aa" , is);

System.out.println(s+"00000");

JSONObject Json = new JSONObject();

JSONArray JsonArray = new JSONArray();

if(s) {

Json.put("status", "1");

Json.put("data", s);

Json.put("contents", "导出成功");

}else {

Json.put("status", "0");

Json.put("data", s);

Json.put("contents", "导出失败");

}

JsonArray.add(Json);

try {

resp.setCharacterEncoding("UTF-8");

resp.getWriter().print(Json);

} catch (IOException e) {

e.printStackTrace();

}

}

public static boolean sendMail(String subject, String to, String content, InputStream is) throws GeneralSecurityException, IOException {

boolean isFlag = false;

// 收件人电子邮箱

//String to = "收件人电子邮箱";

// 发件人电子邮箱

String from = "发件人电子邮箱";

// 指定发送邮件的主机为 smtp.qq.com

String host = "smtp.qq.com"; //QQ 邮件服务器

// 获取系统属性

Properties properties = System.getProperties();

// 设置邮件服务器

properties.setProperty("mail.smtp.host", host);

properties.put("mail.smtp.auth", "true");

MailSSLSocketFactory sf = new MailSSLSocketFactory();

sf.setTrustAllHosts(true);

properties.put("mail.smtp.ssl.enable", "true");

properties.put("mail.smtp.ssl.socketFactory", sf);

// 获取默认session对象

Session session = Session.getDefaultInstance(properties,new Authenticator(){

public PasswordAuthentication getPasswordAuthentication()

{

return new PasswordAuthentication("发件人电子邮箱", "发件人电子邮箱密码"); //发件人邮件用户名、密码

}

});

try{

// 创建默认的 MimeMessage 对象

MimeMessage message = new MimeMessage(session);

// Set From: 头部头字段

message.setFrom(new InternetAddress(from));

// Set To: 头部头字段

message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

// Set Subject: 头部头字段

message.setSubject(subject);

// 设置消息体

// 创建消息部分

BodyPart messageBodyPart = new MimeBodyPart();

// 消息

messageBodyPart.setText(subject);

// 创建多重消息

Multipart multipart = new MimeMultipart();

// 设置文本消息部分

multipart.addBodyPart(messageBodyPart);

// 附件部分

messageBodyPart = new MimeBodyPart();

String filename = subject+".xls";

DataSource source = new ByteArrayDataSource(is, "application/msexcel");

messageBodyPart.setDataHandler(new DataHandler(source));

messageBodyPart.setFileName(filename);

multipart.addBodyPart(messageBodyPart);

// 发送完整消息

message.setContent(multipart);

// 发送消息

Transport.send(message);

System.out.println("Sent message successfully....from runoob.com");

isFlag = true;

}catch (MessagingException mex) {

mex.printStackTrace();

isFlag = false;

}

return isFlag;

//return false;

}

}

转自LCSDNY的博客