HSSFWorkbook hwb=new HSSFWorkbook();
HSSFSheet sheet = hwb.createSheet(seldate+"|"+seldate2);
HSSFRow rowhead= sheet.createRow((short)0);
rowhead.createCell((short) 0).setCellValue("NUMBER");
rowhead.createCell((short) 1).setCellValue("EMPLOYEE NAME");
rowhead.createCell((short) 2).setCellValue("ITEM QUANTITY");
rowhead.createCell((short) 3).setCellValue("AMOUNT PAID");
//rowhead.createCell((short) 4).setCellValue("");
String sql="something";
ResultSet rs=st.executeQuery(sql);
ResultSetMetaData rsmd=null;
rsmd=rs.getMetaData();
int colcnt=rsmd.getColumnCount();
int i=1;
double grandTotal = 0.0;
while(rs.next())
{
/*----*/
String [] dot=new String[colcnt];
//System.out.println("\n record count for data :"+(++tr));
for (int jk=1;jk<=colcnt;jk++)
{
dot[jk-1]=rs.getString( jk);
}
al.add(dot);
}
String pot []=null;
//HSSFRow row= sheet.createRow((short)i);
for(int mn=0;mn<al.size();mn++)
{
pot=(String[])al.get(mn);
String number=pot[0];
String empname=pot[1];
String itemqty=pot[2];
String emprate=pot[3];
double Rate=Double.parseDouble(emprate);
//out.println(Rate);
int Qty=Integer.parseInt(itemqty);
//out.println(Rate);
totAmt=(Rate)*(Qty);
grandTotal += totAmt;
/*----*/
HSSFRow row= sheet.createRow((short)i);
//row.createCell((short) 0).setCellValue(Integer.toString(rs.getInt("BID")));
row.createCell((short) 0).setCellValue(number);
row.createCell((short) 1).setCellValue(empname);
row.createCell((short) 2).setCellValue(itemqty);
row.createCell((short) 3).setCellValue(totAmt);
//row.createCell((short) 4).setCellValue(rs.getString(""));
i++;
//row.createCell((short)3).setCellValue("12345");
}
/*--------------------------*/
HSSFRow row1=sheet.createRow((short)i);
row1.createCell((short) 2).setCellValue("Grand Total");
row1.createCell((short) 3).setCellValue(grandTotal);
/*---------------------------*/
FileOutputStream fileOut = new FileOutputStream(filename);
hwb.write(fileOut);
fileOut.close();
//out.println("<script>win=window.open('ExcelMsg.jsp','popup','toolbar=no,status=no,height=300,width=800');</script>");
我有上面的代码,在执行时生成存储在客户端的Excel文件,直接到名为“report”的目录中的“D”驱动器。我想通过用户选择实现这一点意味着它必须打开文件对话框(保存对话框)并让用户指定他想要存储Excel文件的位置。如何做到这一点?
更新代码
<%
ArrayList al=new ArrayList();
int tr=0;
double totAmt=0.0;
try
{
String seldate=request.getParameter("Sdate");
out.println("\n selected date : :"+seldate);
String seldate2=request.getParameter("Sdate2");
out.println("\n selected date 2 : :"+seldate2);
String str_date=seldate2;
SimpleDateFormat formatter ;
Date date =new Date() ;
Calendar cal2=Calendar.getInstance();
formatter = new SimpleDateFormat("dd-MMM-yyyy");
//date = (Date)formatter.parse(str_date);
cal2.setTime(formatter.parse(str_date));
cal2.add(Calendar.DATE,1);
str_date=formatter.format(cal2.getTime());
out.println("\n Today is " +str_date );
Calendar cal = new GregorianCalendar();
String name=cal.get(Calendar.DATE) +"-" +(cal.get(Calendar.MONTH)+1) + "-"+cal.get(Calendar.YEAR);
/*-------------------------------------------------------------------------------------------------*/
System.out.println("1");
String fileStoreURL="";
String rootpath="D:";
fileStoreURL =rootpath+"/Report";
System.out.println("2");
try {
File f = new File(fileStoreURL);
if (!f.exists())
{
f.mkdirs();
}
}
catch (Exception e)
{
}
System.out.println("3");
String filename=fileStoreURL+"/"+name+".xls" ;
//String filename=name+".xls" ;
System.out.println("4");
/*-------------------------------------------------------------------------------------------------*/
System.out.println("5");
HSSFWorkbook hwb=new HSSFWorkbook();
HSSFSheet sheet = hwb.createSheet(seldate+"|"+seldate2);
HSSFRow rowhead= sheet.createRow((short)0);
rowhead.createCell((short) 0).setCellValue("NUMBER");
rowhead.createCell((short) 1).setCellValue("EMPLOYEE NAME");
rowhead.createCell((short) 2).setCellValue("ITEM QUANTITY");
rowhead.createCell((short) 3).setCellValue("AMOUNT PAID");
//rowhead.createCell((short) 4).setCellValue("");
String sql="something";
ResultSet rs=st.executeQuery(sql);
ResultSetMetaData rsmd=null;
rsmd=rs.getMetaData();
int colcnt=rsmd.getColumnCount();
int i=1;
double grandTotal = 0.0;
while(rs.next())
{
/*----*/
String [] dot=new String[colcnt];
//System.out.println("\n record count for data :"+(++tr));
for (int jk=1;jk<=colcnt;jk++)
{
dot[jk-1]=rs.getString( jk);
}
al.add(dot);
}
String pot []=null;
//HSSFRow row= sheet.createRow((short)i);
for(int mn=0;mn<al.size();mn++)
{
pot=(String[])al.get(mn);
String number=pot[0];
String empname=pot[1];
String itemqty=pot[2];
String emprate=pot[3];
double Rate=Double.parseDouble(emprate);
//out.println(Rate);
int Qty=Integer.parseInt(itemqty);
//out.println(Rate);
totAmt=(Rate)*(Qty);
grandTotal += totAmt;
/*----*/
HSSFRow row= sheet.createRow((short)i);
//row.createCell((short) 0).setCellValue(Integer.toString(rs.getInt("BID")));
row.createCell((short) 0).setCellValue(number);
row.createCell((short) 1).setCellValue(empname);
row.createCell((short) 2).setCellValue(itemqty);
row.createCell((short) 3).setCellValue(totAmt);
//row.createCell((short) 4).setCellValue(rs.getString(""));
i++;
//row.createCell((short)3).setCellValue("12345");
}
/*--------------------------*/
HSSFRow row1=sheet.createRow((short)i);
row1.createCell((short) 2).setCellValue("Grand Total");
row1.createCell((short) 3).setCellValue(grandTotal);
/*---------------------------*/
response.setHeader("Content-Length", String.valueOf(filename.length())); response.setHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
InputStream input = new BufferedInputStream(new FileInputStream(filename), 1024 * 10);
OutputStream output = new BufferedOutputStream(response.getOutputStream(), 1024 * 10);
byte[] buffer = new byte[1024 * 10];
int length;
while ((length = input.read(buffer)) > 0)
{
output.write(buffer, 0, length);
}
output.flush();
output.close();
input.close();
ERROR:
java.io.FileNotFoundException: 1-8-2012.xls (The system cannot find the file spe
cified)
java.io.FileNotFoundException: 1-8-2012.xls (The system cannot find the file spe
cified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at org.apache.jsp.sapep.elrservices.processor.ExcelReport2_jsp._jspServi
ce(ExcelReport2_jsp.java:238)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:377)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:48
9)
at java.lang.Thread.run(Unknown Source)
答案 0 :(得分:1)
除了需要设置响应的File
和ServletOutputStream
之外,您还需要将content-length
的内容写入content-disposition
,
这是一个简单的例子:
response.setHeader("Content-Length", String.valueOf(file.length()));
response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
InputStream input = new BufferedInputStream(new FileInputStream(file), 1024 * 10);
OutputStream output = new BufferedOutputStream(response.getOutputStream(), 1024 * 10);
byte[] buffer = new byte[1024 * 10];
int length;
while ((length = input.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
output.flush();
output.close();
input.close();
显然,您还需要添加正确的异常处理代码。
答案 1 :(得分:0)
您需要将文件的内容写入ServletOutputStream,此外您还需要设置响应的内容长度和内容处理,如上图所示。
进入“另存为”你需要做类似下面的事情,
转到浏览器设置并更改默认下载位置,以便在下载之前询问保存每个文件的位置。
对于Google Chrome,
转到: - 设置&gt;显示进展设置&gt;下载。勾选复选框在下载之前询问每个文件的保存位置。