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Apache FileUpload 上传以及 JExcelApi 解析

2008-09-27 18:48 507 查看
 最近遇到点读取 Excel 数据的问题，于是花了点时间找开源工具。
要解析 Excel，首当其冲的是上传文件，以前在项目里我们用 SmartUpload 进行上传，不过这个项目似乎已经停止开发了，于是在这里我使用 Apache Commons FileUpload，可以在 http://jakarta.apache.org/commons/fileupload 找到。目前该项目的最新版本是 1.1.1，网上有大量的范例程序，不过后来用的时候发现大部分方法在新版本中都不推荐使用了，于是好好读了一回 API 和官方范例。

先来看看如何上传文件，Servlet 很简单，在这里我限制了最大上传量为 1M，且直接读进内存中，不进行磁盘临时文件缓存。

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java.io.IOException;
java.io.PrintWriter;
java.io.File;
java.net.URI;
java.net.URL;
 
javax.servlet.ServletException;
javax.servlet.http.HttpServlet;
javax.servlet.http.HttpServletRequest;
javax.servlet.http.HttpServletResponse;
 
java.util.List;
 
org.apache.commons.fileupload.RequestContext;
org.apache.commons.fileupload.servlet.ServletRequestContext;
org.apache.commons.fileupload.servlet.ServletFileUpload;
org.apache.commons.fileupload.disk.DiskFileItemFactory;
org.apache.commons.fileupload.FileItem;
 
UploadServlet    HttpServlet
 

UploadServlet()
();

 

destroy()
.destroy();

 
doGet(HttpServletRequest request, HttpServletResponse response)
ServletException, IOException

 

doPost(HttpServletRequest request, HttpServletResponse response)
ServletException, IOException
response.setContentType(  );
response.setCharacterEncoding(  );
PrintWriter out  =  response.getWriter();
out.println(  );
out.println(  );
out.println(  );

URL url  =  getServletContext().getResource(  );

RequestContext requestContext  =     ServletRequestContext(request);

(ServletFileUpload.isMultipartContent(requestContext))

DiskFileItemFactory factory  =     DiskFileItemFactory();

factory.setSizeThreshold( 1024   *   1024 );

ServletFileUpload upload  =     ServletFileUpload(factory);

upload.setSizeMax( 1024   *   1024 );

List items  =    ;

items  =  upload.parseRequest(requestContext);

(   i  =   0 ; i  <  items.size(); i ++ )
FileItem fi  =  (FileItem) items.get(i);

( ! fi.isFormField())

String sourcePath  =  fi.getName();
String[] sourcePaths  =  sourcePath.split(  );

String fileName  =  sourcePaths[sourcePaths.length  -   1 ];

File uploadedFile  =     File(   URI(url.toString() + fileName));

fi.write(uploadedFile);
out.println(fileName +  );

(Exception e)
out.println(  );
out.println(  + e.toString());
e.printStackTrace();

out.println(  );
out.println(  );
out.flush();
out.close();

 

init()    ServletException
表单上一定要加ENCTYPE="multipart/form-data"
<form id="frm_reqNew" name="frm_reqNew" ENCTYPE="multipart/form-data" action="$!actionPath/deliver/deliverReqCreate.shtml" method="post" >
-------------------------------------------------------------------------------------------------------------------
上面的程序示范了如何上传文件到服务器，本文的主要目的不光是上传，还要进行 Excel 解析，抽取有用的内容。开源的 Excel 解析器很多，在此我选择了 JExcelApi，可以在 http://jexcelapi.sourceforge.net 找到，据说是韩国人开发的，最新版本是 2.6.2。为什么没有选 POI，原因也是因为它 N 久没有更新了。我总是喜欢最新的东东，比如 Adobe 的 PDF Reader，硬是下载了 8.0，结果感觉还没有 6.0 好用。:(

以下程序修改直上传，做了部分调整，取消了文件储存，直接通过读取输入流进行解析，并假设约定的 Excel 文件有五列 N 行，第一行为标题信息。
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java.io.IOException;
java.io.PrintWriter;
 
javax.servlet.ServletException;
javax.servlet.http.HttpServlet;
javax.servlet.http.HttpServletRequest;
javax.servlet.http.HttpServletResponse;
 
java.util.List;
 
org.apache.commons.fileupload.RequestContext;
org.apache.commons.fileupload.servlet.ServletRequestContext;
org.apache.commons.fileupload.servlet.ServletFileUpload;
org.apache.commons.fileupload.disk.DiskFileItemFactory;
org.apache.commons.fileupload.FileItem;
 
jxl.Workbook;
jxl.Sheet;
jxl.Cell;
 
UploadServlet    HttpServlet

UploadServlet()
();

 

destroy()
.destroy();

 
doGet(HttpServletRequest request, HttpServletResponse response)
ServletException, IOException

 

doPost(HttpServletRequest request, HttpServletResponse response)
ServletException, IOException
response.setContentType(  );
response.setCharacterEncoding(  );
PrintWriter out  =  response.getWriter();
out.println(  );
out.println(  );
out.println(  );

FileItem fileItem  =    ;

RequestContext requestContext  =     ServletRequestContext(request);

(ServletFileUpload.isMultipartContent(requestContext))

DiskFileItemFactory factory  =     DiskFileItemFactory();

factory.setSizeThreshold( 1024   *   1024 );

ServletFileUpload upload  =     ServletFileUpload(factory);

upload.setSizeMax( 1024   *   1024 );

List items  =    ;
items  =  upload.parseRequest(requestContext);

(   i  =   0 ; i  <  items.size(); i ++ )
FileItem fi  =  (FileItem) items.get(i);

( ! fi.isFormField())
fileItem  =  fi;

;

out.println(parseExcel(fileItem));
(Exception e)
out.println(  );
out.println(  + e.toString());
e.printStackTrace();

out.println(  );
out.println(  );
out.flush();
out.close();

 

String parseExcel(FileItem fi)    Exception

Workbook workbook  =    ;

workbook  =  Workbook.getWorkbook(fi.getInputStream());
Sheet sheet  =  workbook.getSheet( 0 );

count  =  sheet.getRows();

String a1  =  sheet.getCell( 0 , 0 ).getContents();
String a2  =  sheet.getCell( 1 , 0 ).getContents();
String a3  =  sheet.getCell( 2 , 0 ).getContents();
String a4  =  sheet.getCell( 3 , 0 ).getContents();
String a5  =  sheet.getCell( 4 , 0 ).getContents();

(   i  =   1 ;i  <  count;i ++ )
Cell[] cells  =  sheet.getRow(i);
System.out.println(cells[ 0 ].getContents()
+ cells[ 1 ].getContents() + cells[ 2 ].getContents()
+ cells[ 3 ].getContents() + cells[ 4 ].getContents());

;
(Exception e)
e;

(workbook !=  )
workbook.close();

init()    ServletException
JExcelApi 用起来很简单，而且还可以根据 Excel 中数据类型转换成 Java 数据类型，比如 int、double，具体信息可以参考它的开发指南。当然，本范例还提供现构造 Excel 然后下载的方法，如果以后遇到，一定继续完善。
------------------------------------------------------------------------------------------------------------------
生成 excel 和下载
代码如下，放在 servlet 中，io 异常我没捕获，直接由 get or post 方法抛出，当然，如果更严谨点可以放在 finally 里关闭。
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response.setContentType();
String filename =  String(.getBytes(),);
response.setHeader(,+filename);
 

String materialName = ;
String size = ;
String unit = ;
String qty = ;
String band = ;
String company = ;
String memo = ;
String price = ;
String repDate = ;
List<String[]> list =  ArrayList<String[]>();
( i = 10; i > 0; i--)
String[] outPut = materialName,size,unit,qty+i,band,company,memo,price,repDate;
list.add(outPut);

 

ByteArrayOutputStream baos =  ByteArrayOutputStream();

WritableWorkbook workbook = Workbook.createWorkbook(baos);

WritableSheet sheet = workbook.createSheet(, 0);

WritableFont blodFont =  WritableFont(WritableFont.TAHOMA,10,WritableFont.BOLD, );
WritableCellFormat blodFormat =  WritableCellFormat (blodFont);
Label label = ;

label =  Label(0, 0, , blodFormat);
sheet.addCell(label);
label =  Label(1, 0, , blodFormat);
sheet.addCell(label);
label =  Label(2, 0, , blodFormat);
sheet.addCell(label);
label =  Label(3, 0, , blodFormat);
sheet.addCell(label);
label =  Label(4, 0, , blodFormat);
sheet.addCell(label);
label =  Label(5, 0, , blodFormat);
sheet.addCell(label);
label =  Label(6, 0, , blodFormat);
sheet.addCell(label);
label =  Label(7, 0, , blodFormat);
sheet.addCell(label);
label =  Label(8, 0, , blodFormat);
sheet.addCell(label);

( i = 1; i <= list.size(); i++)
String[] outPut = list.get(i-1);
label =  Label(0, i, outPut[0]);
sheet.addCell(label);
label =  Label(1, i, outPut[1]);
sheet.addCell(label);
label =  Label(2, i, outPut[2]);
sheet.addCell(label);
label =  Label(3, i, outPut[3]);
sheet.addCell(label);
label =  Label(4, i, outPut[4]);
sheet.addCell(label);
label =  Label(5, i, outPut[5]);
sheet.addCell(label);
label =  Label(6, i, outPut[6]);
sheet.addCell(label);
label =  Label(7, i, outPut[7]);
sheet.addCell(label);
label =  Label(8, i, repDate);
sheet.addCell(label);

workbook.write();
workbook.close();
 

OutputStream os = response.getOutputStream();
os.write(baos.toByteArray());
os.flush();
os.close();
baos.close();
(RowsExceededException e)
e.printStackTrace();
(WriteException e)
e.printStackTrace();
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标签：  apache string output exception excel initialization
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