使用带有保存对话框的 java 将内容导出到文本文件
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export content to a text file using java with save dialog
提问by Java Questions
i have a result set which has got some values, i want to export the data which is there in result set as a text file with the save dialog.
我有一个具有一些值的结果集，我想将结果集中的数据导出为带有保存对话框的文本文件。
how to do this in java?.
如何在java中做到这一点？
I have done the above requirement for excel and java like the following.
我已经完成了excel和java的上述要求，如下所示。
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment; filename=\"" + reportName + ".xls\"");
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment; filename=\"" + reportName + ".xls\"");
and
和
response.setHeader("Content-disposition", "attachment; filename=\"" + reportName + ".pdf\"");
response.setContentType("application/pdf");
response.setHeader("Content-disposition", "attachment; filename=\"" + reportName + ".pdf\"");
response.setContentType("application/pdf");
UPDATE :
更新 ：
if(exportTo.equals("text")){
response.setContentType("text/plain");
response.setHeader("Content-disposition", "attachment; filename=\"" + reportName + ".txt\"");
try {
} catch (Exception e) {
// TODO: handle exception
}
}
in this
在这
in try block how to set the contents which are avilable from resultset to a output stream and make it available.
在 try 块中如何设置从结果集中可用的内容到输出流并使其可用。
回答by MaVRoSCy
the only difference is this :
唯一的区别是：
response.setContentType("text/plain");
You can see a full example here ( http://www.mkyong.com/servlet/servlet-code-to-download-text-file-from-website-java/)
你可以在这里看到一个完整的例子（http://www.mkyong.com/servlet/servlet-code-to-download-text-file-from-website-java/）
UPDATE
更新
This is a demo that I have developed and tested and works perfectly fine:
这是我开发和测试的演示，并且运行良好：
public class ServletDownloadDemo extends HttpServlet {
private static final int BYTES_DOWNLOAD = 1024;
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
response.setContentType("text/plain");
response.setHeader("Content-Disposition", "attachment;filename=downloadname.txt");
String s = "Test\n\nText file contects!!";
InputStream input = new ByteArrayInputStream(s.getBytes("UTF8"));
int read = 0;
byte[] bytes = new byte[BYTES_DOWNLOAD];
OutputStream os = response.getOutputStream();
while ((read = input.read(bytes)) != -1) {
os.write(bytes, 0, read);
}
os.flush();
os.close();
}
}
It downloads a text file named downloadname.txtwith the contents of String s.
它下载一个名为的文本文件downloadname.txt与内容String s。
UPDATE 2
更新 2
String s = "";
while (rs.next()) {
s += rs.getString("column_name");
}
if (exportTo.equals("text")) {
response.setContentType("text/plain");
response.setHeader("Content-Disposition", "attachment;filename=downloadname.txt");
try {
InputStream input = new ByteArrayInputStream(s.getBytes("UTF8"));
int read = 0;
byte[] bytes = new byte[BYTES_DOWNLOAD];
OutputStream os = response.getOutputStream();
//data form resultset
while ((read = input.read(bytes)) != -1) {
os.write(bytes, 0, read);
}
os.flush();
os.close();
} catch (Exception e) {
// TODO: handle exception
}
}
You have to populate your ResultSetand place what you need in String s. That's all.
您必须填充您的内容ResultSet并将其放置在String s. 就这样。
