Java 批量文件压缩导出并下载到本地示例代码
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2023-12-17 16:13:40
主要用的是org.apache.tools.zip.zipoutputstream 这个zip流,这里以execl为例子。
思路首先把zip流写入到http响...
主要用的是org.apache.tools.zip.zipoutputstream 这个zip流,这里以execl为例子。
思路首先把zip流写入到http响应输出流中,再把excel的流写入zip流中(这里可以不用生成文件再打包,只需把execl模板读出写好数据输出到zip流中,并为每次的流设置文件名)
例如:在项目webapp下execl文件中 存在1.xls,2.xls,3.xls文件
1.controller
@requestmapping(value = "/exportall",method = requestmethod.get) public void exportall() throws ioexception{ try { httpservletresponse response=this.getresponse(); response.setcontenttype("application/octet-stream"); string execlname = "报表"; response.addheader("content-disposition", "attachment;filename="+new string(execlname.getbytes(),"iso-8859-1") +".zip"); outputstream out = response.getoutputstream(); testservice.exportall(out); } catch (exception e) { .... } }
2.service
import java.io.outputstream; import org.apache.poi.hssf.usermodel.hssfsheet; import org.apache.poi.hssf.usermodel.hssfworkbook; import org.apache.tools.zip.zipentry; import org.apache.tools.zip.zipoutputstream; import java.io.file; import java.io.fileinputstream; import javax.servlet.http.httpservletrequest; import org.apache.poi.hssf.usermodel.hssfcellstyle; import org.apache.poi.hssf.usermodel.hssfsheet; import org.apache.poi.hssf.usermodel.hssfworkbook; import org.apache.poi.poifs.filesystem.poifsfilesystem; import org.springframework.web.context.request.requestcontextholder; import org.springframework.web.context.request.servletrequestattributes; public boolean exportall(outputstream out){ zipoutputstream zipstream = null; hssfworkbook wb = null; try{ list<test> datas = testservice.gettestdata(); zipstream = new zipoutputstream(out);//这里是把zip流输出到httpresponse流中 for(int i=0;i<3;i++){ wb = poiutil.getworkbook(i);//获取0,1,2.xls文件 hssfsheet sheet = wb.getsheetat(0); testservice.setsheet(sheet,datas);//...处理文件内容操作 zipentry zipentry = new zipentry(new string("文件名xxx".getbytes(),"utf-8")+".xls"); //自己命名,这里假设是1,2,3 zipstream.putnextentry(zipentry); wb.write(zipstream);//这里就是循环每次把execl写入zip包中 zipstream.flush(); } }catch (exception e) { throw new sysexception(errorconstants.common_system_error, e); }finally { try { if(wb!=null){ wb.close(); } if(zipstream!=null){ zipstream.close(); } out.flush(); out.close(); } catch (ioexception e) { throw new sysexception(errorconstants.common_close_error, e); } } } public static hssfworkbook getworkbook(string bh){ try { string line = file.separator; servletrequestattributes arequestattributes=(servletrequestattributes)requestcontextholder.getrequestattributes(); httpservletrequest request =arequestattributes==null?null:arequestattributes.getrequest(); string webpath=request.getservletcontext().getrealpath("/"); file file = new file(webpath+line+"excel"+line+bh+".xls"); poifsfilesystem poifsfilesystem = new poifsfilesystem(new fileinputstream(file)); hssfworkbook wb = new hssfworkbook(poifsfilesystem); return wb; } catch (exception e) { throw new sysexception(errorconstants.common_system_error,e); } }
最后的结果生成一个报表.zip,其中包含3个文件1.xls,2.xls,3.xls
总结
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