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java实现数据库的数据写入到txt的方法

2017-07-25 08:45 816 查看

本文讲解如何用java实现把数据库的数据写入到txt中并实现类似下载软件的样子在网页中弹出下载.

package datatest;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import bean.ConnDB;
public class export extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//设置编码
response.setCharacterEncoding("UTF-8");
//连接数据库
ConnDB conn = new ConnDB();
ServletOutputStream outputstream = null;
BufferedOutputStream buffoutputstream = null;
String txt_name = "导出的txt文件名.txt";//导出的txt文件名
try {
response.reset();// 清空输出流
response.setContentType("text/plain;charset=utf-8");
//设置txt文件名称编码，防止中文乱码
response.setHeader("Content-disposition", "attachment; filename="+URLEncoder.encode(txt_name, "UTF-8"));
StringBuffer write = new StringBuffer();
outputstream=response.getOutputStream();
buffoutputstream = new BufferedOutputStream(outputstream);
//根据id查询数据库
int id=Integer.parseInt(request.getParameter("id"));
String sql = "select a.id,name,account,password ";
sql+="from test_rank a ";
sql+="left join test_join b on b.id=a.id where a.id="+id;
ResultSet rs = conn.doQuery(sql);
String content="";
try {
while(rs.next())
{
//把数据库中读取的数据写入
content=rs.getString("name")+"\r\n";//在txt中换行为\t\n
write.append(content);
content=rs.getString("account")+"\r\n";
write.append(content);
break;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//write.append(content);
//设置编码 防止中文乱码
String str = new String(write.toString().getBytes(),"gbk");
buffoutputstream.write(str.toString().getBytes("gbk"));
buffoutputstream.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
if (outputstream != null)
try {
outputstream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (buffoutputstream != null)
try {
buffoutputstream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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标签： java 数据库数据写入

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