HTTP响应头的内容配置的附件 [英] HTTP response header content disposition for attachments

问题描述

背景

编写一个XML文档浏览器的响应流，并导致浏览器显示另存为对话框。

问题

考虑以下下载（）方法：

  HttpServletResponse的响应= GETRESPONSE（）;

  BufferedWriter将体重=新的BufferedWriter（新OutputStreamWriter（
      response.getOutputStream（）））;

  字符串文件名=domain.xml中;
  字符串MIMETYPE =新MimetypesFileTypeMap中（）的getContentType（文件名）。

  //打印应用程序/八位字节流
  的System.out.println（MIMETYPE：+ MIMETYPE）;

  // response.setContentType（为text / xml;字符集= UTF-8）;
  response.setContentType（MIMETYPE）;
  response.setHeader（内容处置，附件;文件名=
      +文件名）;

  bw.write（getDomainDocument（））;
  bw.flush（）;
  bw.close（）;
 

在Firefox中，XML内容显示在浏览器窗口。在IE 7中，不显示XML内容 - 你要查看的文档来源。既不情况是所希望的结果。

该网页使用下列$ C $下按钮：

 ＆LT; A4J：的commandButton行动=＃{domainContent.download}值=创建域重新呈现=错误/＆GT;
 

这是生成的XML的不的开始与＆LT; XML版本=1.0＆GT; ，而XML内容酷似

 ＆LT;模式的xmlns =htt​​p://www.jaspersoft.com/2007/SL/XMLSchema版本=1.0＆GT;
  ＆LT;项目＆GT;
    ＆LT;项目说明=EDT类codedescriptionId =标签=EDT类codelabelId =RESOURCEID =as_pay_payrolldeduction.edtclass/＆GT;
  ＆LT; /项目＆GT;
  ＆LT;资源＆GT;
    ＆LT; jdbcTable的DataSourceID =JNDIID =as_pay_payrolldeductiontableName值=as_pay.payrolldeduction＆GT;
      ＆LT; fieldList中＆GT;
        ＆LT;字段id =payamountTYPE =java.math.BigDecimal中的/＆GT;
      ＆LT; / fieldList中＆GT;
    ＆LT; / jdbcTable＆GT;
  ＆LT; /资源＆GT;
＆LT; /架构＆GT;
 

更新＃1

请注意的code以下行：

  response.setHeader（内容处置，附件;文件名=+文件名）;
 

更新＃2

使用＆LT; A4J：的commandButton ... /＆GT; 的问题;一个普通的＆LT; H：的commandButton ... /＆GT; 按预期执行。使用＆LT; H：命令... /＆GT; prevents的＆LT; A4J：outputPanel ... /＆GT; 从清凉的任何错误消息。

相关缝讯息。

Mime类型

以下MIME类型不触发另存为对话框：

• 应用程序/八位字节流
• 为text / xml
• text / plain的

问题

什么变化，将导致 A4J：的commandButton 来触发一个另存为对话框，以便将提示用户保存XML文件（ domain.xml中）？

感谢你。

解决方案

问题

在code有以下问题：

• 在Ajax调用（＆LT; A4J：的commandButton ... /＆GT; ）。不带附件的正常工作
• 创建输出的内容，必须先发生。
• 显示错误消息，也不能使用基于Ajax的 A4J 标签。

解决方案

1. 修改＆LT; A4J：的commandButton ... /＆GT; 到＆LT; H：的commandButton ... /＆GT; 。
2. 更新源$ C ​​$ C：
   1. 修改 bw.write（getDomainDocument（））; 到 bw.write（文件）;
   2. 添加字符串文件= getDomainDocument（）; 到的try / catch 的第一行
3. 更改＆LT; A4J：outputPanel ... /＆GT; （未显示）＆LT; H：消息showDetail =假 /＆GT;

从本质上讲，删除相关的的commandButton 所有的阿贾克斯设施。它仍然有可能显示错误信息，并充分利用RichFaces的UI风格。

参考

• <一个href="http://stackoverflow.com/questions/4335849/using-a-commandbutton-in-a-jsf-page-to-download-a-file">Using一个命令在JSF页面中下载一个文件
• <一个href="http://www.$c$cranch.com/t/483892/JSF/java/when-commandButton-commandLink">http://www.$c$cranch.com/t/483892/JSF/java/when-commandButton-commandLink
• http://seamframework.org/135584.lace

Background

Write an XML document to a browser's response stream and cause the browser to display a "Save As" dialog.

Problem

Consider the following download() method:

  HttpServletResponse response = getResponse();

  BufferedWriter bw = new BufferedWriter( new OutputStreamWriter(
      response.getOutputStream() ) );

  String filename = "domain.xml";
  String mimeType = new MimetypesFileTypeMap().getContentType( filename );

  // Prints "application/octet-stream"
  System.out.println( "mimeType: " + mimeType );

  // response.setContentType( "text/xml;charset=UTF-8" );
  response.setContentType( mimeType );
  response.setHeader( "Content-Disposition", "attachment;filename="
      + filename );

  bw.write( getDomainDocument() );
  bw.flush();
  bw.close();

In Firefox, the XML content is displayed in the browser window. In IE 7, the XML content is not displayed -- you have to view the document source. Neither situation is the desired result.

The web page uses the following code for the button:

    <a4j:commandButton action="#{domainContent.download}" value="Create Domain" reRender="error" />

The XML that is generated does not start with <?xml version="1.0"?>, rather the XML content resembles:

<schema xmlns="http://www.jaspersoft.com/2007/SL/XMLSchema" version="1.0">
  <items>
    <item description="EDT Class Code" descriptionId="" label="EDT Class Code" labelId="" resourceId="as_pay_payrolldeduction.edtclass"/>
  </items>
  <resources>
    <jdbcTable datasourceId="JNDI" id="as_pay_payrolldeduction" tableName="as_pay.payrolldeduction">
      <fieldList>
        <field id="payamount" type="java.math.BigDecimal"/>
      </fieldList>
    </jdbcTable>
  </resources>
</schema>

Update #1

Note the following line of code:

response.setHeader( "Content-Disposition", "attachment;filename=" + filename );

Update #2

Using <a4j:commandButton ... /> is the problem; a regular <h:commandButton .../> performs as expected. Using the <h:commandBUtton .../> prevents the <a4j:outputPanel .../> from refreshing any error messages.

Related Seam Message.

Mime Type

The following mime types do not trigger the "Save As" dialog:

• "application/octet-stream"
• "text/xml"
• "text/plain"

Question

What changes will cause the a4j:commandButton to trigger a "Save As" dialog box so that the user is prompted to save the XML file (as domain.xml)?

Thank you.

解决方案

Problems

The code has the following issues:

• An Ajax call (<a4j:commandButton .../>) does not work with attachments.
• Creating the output content must happen first.
• Displaying the error messages also cannot use Ajax-based a4j tags.

Solution

1. Change <a4j:commandButton .../> to <h:commandButton .../>.
2. Update the source code:
   1. Change bw.write( getDomainDocument() ); to bw.write( document );.
   2. Add String document = getDomainDocument(); to the first line of the try/catch.

3. Change the <a4j:outputPanel.../> (not shown) to <h:messages showDetail="false"/>.

Essentially, remove all the Ajax facilities related to the commandButton. It is still possible to display error messages and leverage the RichFaces UI style.

References

• Using a commandButton in a jsf Page to download a file
• http://www.coderanch.com/t/483892/JSF/java/when-commandButton-commandLink
• http://seamframework.org/135584.lace

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