web服务器收到客户端的http请求,会针对每一次请求,分别创建一个用于代表请求的request对象,和代表响应的response对象。

 request和response对象既然代表请求和响应,那么我获取客户机提交过来的数据,找request对象,向客户机输出数据,只需要找response对象。

一:HttpServletResponse对象介绍

  

HttpServletResponse对象代表服务器的响应。这个对象中封装了向客户端发送数据,发送响应头,发送响应状态码的方法。

1.1:负责向客户端(浏览器)发送数据的相关方法

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jU/Sc+AMCjgSyzgRoCAABAI8gyG6ghAAAANIIss4EaAgAAQCPIMhuoIQAAADSCLLOBGgIAAEAjJ1kGAAAAAOtyWS2DFqghAAAANMImpg3UEAAAABpBltlADQEAAKCR/wMnO+UjOK9lXAAAAABJRU5ErkJggg==" alt="" />

1.2:发送响应头的相关方法

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" 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+tyIQUU3cyx32PTX2NX0vR4EjaY+obtaXVnW5i6gBnMpCpf7HHuZ1Dx5q6X7Ti6dySuj1UaGPx+qtEWiQ/OmQrvrZLF/empq5Lyjpo1tSzJYo0KJLEhOJkKPqQZNUCgHMYxdRPeP1+uKm3e/1umfoi2Ju/rVjUIU/AVuP6qPMpwdn2Gyt0+pR20zF1ZZCzGqyccVg2oZin+roXSQKAQxjL1MV32vEhK8/60TnetfK8dpM/p67oVN60W+/enf4umr1Z70KTJrqJtLzWSphkfXQTtjnXKZQ85Eda3RElxVinW31/DXIy0u+7LyDbo4rMeq1klaSSEE1FRQwAHMUopg46yeW4ixKRjR90VPKiu6RBxqEpn9BHgNHA1N+Y5LPRmAwotZek0cYBAGZiCFOPX1Dz5b+EBwAAiBnC1AEAAGA/mDoAAMAkYOoAAACTgKkDAABMAqbeDeuHgKE1jQb85OtY9CPphwg7p4PcDiLiQH3UeLKcLph6L/gdHX1pNOBjmvpynDBMfSgw9SSf1t8NmHof6kz9wyfrgUxg6g5H/Xqit/s1R5/G3NO4mnfXvxNMvQ9HLbJQx9yrIab+Icw9jat5d/07wdS7Yc285DfanW/Al35vXg9eh/mSfD3xhq/HKer0t3QQlPxKu3XI6pdTOpk2qVZRshEjFq3O44yPXsLP7O8Gbf5YSvR+hRSHjIOoXy/h9Ch51OqUU1Qfh/Wuot853R8Eq7/OrjKY7wKm3pPkHaLvKgE74zci4w29PRmjxO+pq3RqZ/6iPIs9FEmRelq/3eqvj55nzzzMzmonf+n8cfTUzYfNxlH3o6O/6XV04i2dirC6+S/WPUq/ouctwNT7E8/4NVak1SJWTObPysvqFG1GXzT99qwesVObxdQZf7+/Sh79ksVVxDVIX9REAdk8e8ZfnNXJQRDnYfV8iKtYYsKPqReNQza/VU7slxWW7a+j0NKpXBddcxzvq8rqt3JWXK/BwdSHwJm4ybBNY+kK4icUizrx2Tt5z+J17Erh13U0HJJHERn/m01VuojrUiv66yS3Jq3fqFz30v76883RsNmoGwcnv9iul1DyZOM3hxRbVQ758eI1SpY4cN6OD6beh7pJVro26XVLc5auJgeauhKvCxPz7NTvpMqKnNLUK+b5nhGovi+y7TtNvdF94VfJ5tFNvbTdP+TEFwnG1DuAqdfdtPsX60amXrQYKR+xWy92B+Zfx1Q8Veg69yy1J5u6OK9eZOu21tPI1A+vu4npZeobPfF1PGr+V+jJxiv3qT62A4Kp9yH8xjpknajkEUs7Z/lh1s2cbc/mcXarxy0Z6e86+ZO9W6L1wsmcFfk6xdr2U4njqQgQ8xR1LR5bpV9OT/f0V+9XLG+9UTEO2fxJ/XF1Mbk+PlZLrGQT48QnxSgkg5PD5ZSIw/x+FSkcCkwdzuB97xBogWMG8EZwHQcEU4fmVHw2h+mpe2iD0eA6jgamDgAAMAmYOgAAwCRg6gAAAJOAqQMAAEwCpg4AADAJ4QkAAABTEP704Pl8dqkLAAAwMbx+BwAAmARMHQAAYBL+D/gMwAuoYqFtAAAAAElFTkSuQmCC" alt="" />

1.3:发送响应状态码的相关方法

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1.4:响应状态码的常量

  HttpServletResponse定义了很多状态码的常量,具体查看API

  常见的:404

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二:HttpServletResponse对象常见应用

  2.1使用outputStream流向客户端输出中文数据

  范例:public class ResponseDemo01 extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String data="中国";
        OutputStream op=response.getOutputStream();
        response.setHeader("content-type", "text/html;charse=GBK");
        byte[] dataByteArr=data.getBytes("GBK");
        op.write(dataByteArr);
    }
}

  2.2:使用printwriter流向客户端输出中文数据

  public class ResponseDemo01 extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String data="中国";
        response.setHeader("content-type", "text/html;charset=GBK");
        response.setCharacterEncoding("GBK");
        PrintWriter out=response.getWriter();
        out.print(data);
    }
}

使用printwriter没有将字符串转换成字节数组那一步。

2.3:文件下载

  实现的思路::

    1.获取要下载的文件的绝对路径

    2.获取要下载的文件名

    3.设置content-disposition响应头控制浏览器以下载的形式打开文件

    4.获取要下载的文件输入流

    5.创建数据缓冲区

    6.通过response对象获取OutputStream流

    7.将FileInputStream流写入到buffer缓冲区

    8.使用OutputStream将缓冲区的数据输出到客户端浏览器

代码:

  public class ResponseDemo02 extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //1:获取下载文件的绝对路径
        String realPath=this.getServletContext().getRealPath("/download/2.jpg");
        //2获取下载的文件名
        String fileName=realPath.substring(realPath.lastIndexOf("\\")+1);
        //3设置content-disposition响应头控制浏览器以下载的形式打开文件

中文文件名要使用URLEncoder.encode方法进行编码,否则会出现文件名乱码
 response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(fileName, "UTF-8"));

response.setHeader("content-disposition", "attachment;filename="+fileName);
        //4:获取要下载的文件输入流
        InputStream in=new FileInputStream(realPath);
        int len=0;
        //5:创建数据缓冲区
    byte[] buffer=new byte[1024];
        //6通过response对象获取outputStream流
    OutputStream out=response.getOutputStream();
        //7将fileInputStream流写入到buffer缓冲区
    while((len=in.read(buffer))>0){
        //8使用outputStream将缓冲区的数据输出到客户端浏览器
        out.write(buffer,0,len);
    }
        in.close();
    }
}

第三步是以下载的形式打开文件,然后inputsteam是把内容写入到路径中,然后outputstream输出到客户端展示出来。

文件下载注意事项:编写文件下载功能时推荐使用OutputStream流,避免使用PrintWriter流,因为OutputStream流是字节流,可以处理任意类型的数据,而PrintWriter流是字符流,只能处理字符数据,如果用字符流处理字节数据,会导致数据丢失。

 response实现细节:  

    getOutputStream和getWriter方法分别用于得到输出二进制数据、输出文本数据的ServletOuputStream、Printwriter对象。
    getOutputStream和getWriter这两个方法互相排斥,调用了其中的任何一个方法后,就不能再调用另一方法。  
    Servlet程序向ServletOutputStream或PrintWriter对象中写入的数据将被Servlet引擎从response里面获取,Servlet引擎将这些数据当作响应消息的正文,然后再与响应状态行和各响应头组合后输出到客户端。
    Serlvet的service方法结束后,Servlet引擎将检查getWriter或getOutputStream方法返回的输出流对象是否已经调用过close方法,如果没有,Servlet引擎将调用close方法关闭该输出流对象。

  

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