浅谈JavaMail的应用之[文件下载打包并发送邮件的实现]

　　文件的下载与压缩这一部分逻辑在业务的Servlet层来实现它.并调用邮件发送功能。

首先要用到两个jar包activation.jar和mail.jar,这个如果没有可以网上下载一下。

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

List list = new ArrayList();
String[] path1 = new String[2];
//从硬盘获取要压缩的文件路径
path1[0] = "F:/测试/in1.xml";
path1[1] = "F:/测试/out1.xml";
list.add(path1);

String[] path2 = new String[2];
path2[0] = "F:/测试/in2.xml";
path2[1] = "F:/测试/out2.xml";
list.add(path2);
//================================================================================================
String gpIdAndNoStr = request.getParameter("gpIdAndNo");
String chosedReason = request.getParameter("chosedReason");
System.out.println("选择"+chosedReason+"模块");
//要生成压缩包的存储地址和文件名
//String desPath = "/本地磁盘路径/压缩文件名.zip";
//定义下载文件头
//response.setHeader("Content-Disposition", "attachment"+";filename="+gpIdAndNoStr+".zip");
//File zipFile = new File(desPath);
//获取上下文(当前项目的具有唯一性)
//String contextPath = request.getSession().getServletContext().getRealPath("/");
//返回此抽象路径的绝对路径的字符串
//File filepath = new File("");
//String contextPath = filepath.getAbsolutePath();
String ph = Thread.currentThread().getContextClassLoader().getResource("").getPath();
int num = ph.indexOf(".metadata");
String contextPath = ph.substring(1, num).replace('/', '\\')+request.getContextPath();
System.out.println("路径:"+contextPath);
//创建一个存放临时文件的目录
File tempFiles = new File(contextPath,"temp");
if(!tempFiles.exists()){
tempFiles.mkdirs();
}
//要生成压缩包的存储地址和文件名
//File tempFile = File.createTempFile(gpIdAndNoStr+"_", ".zip");
File tempFile = new File(tempFiles.getCanonicalPath()+"/"+gpIdAndNoStr+".zip");
if(!tempFile.exists()){
tempFile.createNewFile();
}
ZipOutputStream zipStream = null;
//创建输入流对象
FileInputStream zipSource = null;
//定义缓冲流
BufferedInputStream bufferStream = null;
//压缩条目不是具体的文件,而是压缩文件列表中的列表项。称为条目，就像索引一样
ZipEntry zipEntry = null;
//定义文件和目录路径的抽象表示形式
File file = null;
SimpleDateFormat sdf = new SimpleDateFormat();
//获取当前系统日期
Date date = new Date();
String dateStr = sdf.format(date);
int k =1;
try{
//构造最终压缩包的输出流
zipStream = new ZipOutputStream(new FileOutputStream(tempFile));
System.out.println("创建:"+tempFile.getAbsolutePath());
//zipStream = new ZipOutputStream(responce.getOutputStream());
for(int i=0; i
//通过List中获取的服务器文件下载路径,得到文件和目录路径名称的抽象表示形式的对象
file = new File(list.get(i)[0]);
//将要压缩的文件格式化为输入流
zipSource = new FileInputStream(file);
//定义压缩包中输入文件的文件名及目录
zipEntry = new ZipEntry(gpIdAndNoStr+"_"+dateStr+"_in_"+k+".xml");
//定义该压缩条目位置,开始写入文件到压缩包
zipStream.putNextEntry(zipEntry);
//输入缓冲流
bufferStream = new BufferedInputStream(zipSource,1024*4);
int len = 0;
//创建读写缓冲区
byte[] buf = new byte[1024*4];
//读入字节流
while((len = bufferStream.read(buf))!=-1){
zipStream.write(buf, 0, len);
}
//通过List中获取的服务器文件下载路径,得到文件和目录路径名称的抽象表示形式的对象
file = new File(list.get(i)[1]);
//将要压缩的文件格式化为输入流
zipSource = new FileInputStream(file);
//定义压缩包中输入文件的文件名及目录
zipEntry = new ZipEntry(gpIdAndNoStr+"_"+dateStr+"_out_"+k+".xml");
//定义该压缩条目位置,开始写入文件到压缩包
zipStream.putNextEntry(zipEntry);
//输入缓冲流
bufferStream = new BufferedInputStream(zipSource,1024*4);
//读入字节流
while((len = bufferStream.read(buf))!=-1){
zipStream.write(buf, 0, len);
}
k++;
}
//关闭流
zipStream.close();
bufferStream.close();
//此处调用邮件发送功能
SenderMail.createAttachMail(tempFile.getCanonicalPath(), gpIdAndNoStr);
//通过压缩包文件存储路径,得到文件和目录路径名的抽象表示形式的对象
File tpfile = new File(tempFile.getCanonicalPath());
//判断目录文件是否存在
if(tpfile.exists()){
//如果存在,则删除目录下的文件
tpfile.delete();
}

}catch(Exception e){
e.printStackTrace();
}finally {

try{
if(null != zipSource)
zipSource.close();
}catch(IOException e1){
e1.printStackTrace();
}
}

}