实验3-HTTP响应对象

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1、实验3HTTP响应对象一、实验目的1.了解和掌握如何从响应对象获得输出流对象；2.掌握如何设置响应类型；3.掌握如何设置响应头和状态码；4.重点掌握如何实现响应重定向。二、实验原理对Servlet的请求目的是要获得响应消息。Servlet要向用户发送响应数据首先要获得输出流对象。另外，通过响应对象还可向客户端发送状态码，也可以设置有关响应头，还可以对响应重定向。三、实验内容与步骤（一）通过设置响应内容类型构建Excel电子表格packagecn.edu.servlet;importjava.io.*;importjava.util.*

2、;importjavax.servlet.*;importjavax.servlet.http.*;publicclassExcelServletextendsHttpServlet{publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{response.setHeader("Cache-Control","no-cache");response.setContentType("a

3、pplication/vnd.ms-excel;charset=gb2312");PrintWriterout=response.getWriter();out.println("

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4、件packagecn.edu.servlet;importjava.io.*;importjava.util.*;importjavax.servlet.*;importjavax.servlet.http.*;publicclassDownloadServletextendsHttpServlet{publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{response.setCo

5、ntentType("application/jar");Filef=newFile("C:\servlet-api.jar");FileInputStreamis=newFileInputStream(f);ServletOutputStreamos=response.getOutputStream();byte[]bytearray=newbyte[1024];intbytesread=0;while((bytesread=is.read(bytearray))!=-1){os.write(bytearray,0,bytesre

6、ad);}os.flush();}}注意：此Servlet正确运行，需要将servlet-api.jar文件复制到C盘根目录下。（三）下面的ShowTimeServlet通过设置refresh响应头实现每2秒钟刷新一次页面。packagecn.edu.servlet;importjava.io.*;importjava.util.*;importjava.text.SimpleDateFormat;importjavax.servlet.*;importjavax.servlet.http.*;publicclassShowTimeS

7、ervletextendsHttpServlet{publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{response.setContentType("text/html;charset=gb2312");response.setHeader("refresh","2");PrintWriterout=response.getWriter();Datedate=newDate()

8、;SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-ddaHH:mm:ss");Strings=sdf.format(date);out.println("")