WEB文件上传下载过程简介（基于Struts2）

WEB文件上传过程简介（基于Struts2），页面上传、Action收取、解析；文件导出

文件处理过程，需要注意对文件的定期清理，避免磁盘占用过多；

1. jsp页面：

  <s:file required="true" name ="myFile" theme="zx2"/>

<s:form action ="myfile.action" name="form" method ="POST" enctype ="multipart/form-data"
onsubmit="return checkSubmit();">

2. Action：

private File myFile;  // 设置get set方法

File tmpfile = new File(path + File.separator + imageFileName);

UserFile.copy(myFile, tmpfile); // 将文件复制一份

myFile.delete(); // 删除上传的临时文件

 BufferedReader reader = new BufferedReader(new FileReader(tmpfile));

int count=0;

while( (line = checkreader.readLine()) != null)

{

line = line.trim(); // 读取文件

3. 导出文件，文件流方式输出：

DataOutputStream os = null;

         os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(fileName,true)));
 

         OutputStreamWriter write = new OutputStreamWriter(os, "UTF-8");

BufferedWriter writer = new BufferedWriter(write);

StringBuffer buf = new StringBuffer();

writer.write(buf.toString());

writer.write("\r\n");

buf.delete(0, buf.length());

          writer.close();