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java 文件大数据Excel下载实例代码
excel可以用xml表示。故可以以此来实现边写边下载文件
package com.tydic.qop.controller;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.tydic.qop.vo.param.RealTimeReportParamVo;
@Controller
@RequestMapping(value = "/exportStream")
public class testExportByStream {
/*
* 导出文件通过流
*/
@RequestMapping(value = "/exportStream.html")
@ResponseBody
public String exportByStream(RealTimeReportParamVo params, HttpServletResponse response) throws Exception{
String fileName="接口统计分析";
response.reset();
response.setContentType("application/octet-stream;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".txt").getBytes(), "iso-8859-1"));
ServletOutputStream out = response.getOutputStream();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
for(int i=0;i<1000000;i++){
String contentStr="aaa自己写的controller"+i+"\n";
System.out.println(contentStr);
byte[] contentByte=(contentStr).getBytes();
InputStream is = new ByteArrayInputStream(contentByte);
readWrite(is,out,bis,bos);
}
if (bis != null)
bis.close();
if (bos != null)
bos.close();
return null;
}
public void readWrite(InputStream is,ServletOutputStream out,BufferedInputStream bis,BufferedOutputStream bos){
try {
bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(out);
byte[] buff = new byte[2048];
int bytesRead;
// Simple read/write loop.
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
bos.flush();
} catch (final IOException e) {
e.printStackTrace();
}
}
}
</div>
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