struts1 文件上传大小的问题

[zuoyangguang]

struts1上传文件的大小限制是在struts-config.xml中设置的，当文件的size大于设定的数字后，报错。问题是actionform中的数据也丢了，请达人帮忙。

[菜继续]

struts1.x上传文件大小设置

一、web.xml配置，这里将文件上传配置为upload模块。 

<?xml version="1.0" encoding="iso-8859-1"?> 
<!DOCTYPE web-app 
  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" 
  "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"> 
<web-app> 
 <display-name>Struts Blank Application</display-name> 
   
  <!-- Standard Action Servlet Configuration (with debugging) --> 
  <servlet> 
    <servlet-name>action</servlet-name> 
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class> 
    <init-param> 
      <param-name>config</param-name> 
      <param-value>/WEB-INF/struts-config.xml</param-value> 
    </init-param> 
    <init-param> 
      <param-name>config/upload</param-name> 
      <param-value>/WEB-INF/upload/struts-config.xml</param-value> 
    </init-param>

<init-param> 
      <param-name>debug</param-name> 
      <param-value>2</param-value> 
    </init-param> 
    <init-param> 
      <param-name>detail</param-name> 
      <param-value>2</param-value> 
    </init-param> 
    <load-on-startup>2</load-on-startup> 
  </servlet> 


  <!-- Standard Action Servlet Mapping --> 
  <servlet-mapping> 
    <servlet-name>action</servlet-name> 
    <url-pattern>*.do</url-pattern> 
  </servlet-mapping> 


  <!-- The Usual Welcome File List --> 
  <welcome-file-list> 
    <welcome-file>index.jsp</welcome-file> 
  </welcome-file-list> 


  <!-- Struts Tag Library Descriptors --> 
  <taglib> 
    <taglib-uri>/tags/struts-bean</taglib-uri> 
    <taglib-location>/WEB-INF/struts-bean.tld</taglib-location> 
  </taglib> 

  <taglib> 
    <taglib-uri>/tags/struts-html</taglib-uri> 
    <taglib-location>/WEB-INF/struts-html.tld</taglib-location> 
  </taglib> 

  <taglib> 
    <taglib-uri>/tags/struts-logic</taglib-uri> 
    <taglib-location>/WEB-INF/struts-logic.tld</taglib-location> 
  </taglib> 

  <taglib> 
    <taglib-uri>/tags/struts-nested</taglib-uri> 
    <taglib-location>/WEB-INF/struts-nested.tld</taglib-location> 
  </taglib> 

  <taglib> 
    <taglib-uri>/tags/struts-tiles</taglib-uri> 
    <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location> 
  </taglib> 

</web-app> 

-------------------------------------------------------------------------------- 

二、struts-config.xml配置和资源文件 

-------------------------------------------------------------------------------- 
<?xml version="1.0" encoding="iso-8859-1"?> 

<!DOCTYPE struts-config PUBLIC 
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" 
          "http://struts.apache.org/dtds/struts-config_1_2.dtd"> 
<struts-config> 
  <form-beans> 
    <form-bean name="uploadForm" type="org.apache.struts.webapp.upload.UpLoadForm" /> 
  </form-beans> 
  <action-mappings> 
    <action path="/upload" forward="/selfile.jsp" /> 
    <!-- Upload Action --> 
    <action path="/uploadsAction"  
            type="org.apache.struts.webapp.upload.UpLoadAction"    
            name="uploadForm" scope="request" input="input"> 
      <forward name="input" path="/selfile.jsp" /> 
      <forward name="display" path="/display.jsp" /> 
    </action> 
  </action-mappings> 
  <!-- 这里设置上传文件的最大值。 -1 不限制大小。缺省值：-1 --> 
  <controller maxFileSize="2M" inputForward="true" /> 
  <message-resources parameter="org.apache.struts.webapp.upload.UploadResources"/> 

</struts-config> 

  资源文件：UploadResources_zh_CN.properties 
maxLengthExceeded=已经超过了上传文件所允许的最大值。 
maxLengthExplanation=注意：这个应用程序允许上传文件的最大值是2M。请看"/WEB-INF/upload/struts-config.xml" 文件更改这个值。 

三、选择上传文件页面：selfile.jsp，如此访问此页面： 
<html:link module="/upload" page="/upload.do"> 继续上传</html:link></h2> 

-------------------------------------------------------------------------------- 
<%@ page contentType="text/html; charset=GBK" %> 
<%@ page import="org.apache.struts.action.*, 
                 java.util.Iterator, 
                 org.apache.struts.Globals" %> 
<%@ taglib uri="/tags/struts-bean" prefix="bean" %> 
<%@ taglib uri="/tags/struts-html" prefix="html" %> 
<%@ taglib uri="/tags/struts-logic" prefix="logic" %> 
<logic:messagesPresent> 
   <ul> 
   <html:messages id="error"> 
      <li><bean:write name="error"/></li> 
   </html:messages> 
   </ul><hr /> 
</logic:messagesPresent> 
<html:html> 

<html:form action="uploadsAction.do" enctype="multipart/form-data"> 
<html:file property="theFile"/> 
<html:submit/> 
</html:form> 
</html:html> 

-------------------------------------------------------------------------------- 

四、表单bean:  UpLoadForm.java 

-------------------------------------------------------------------------------- 
package org.apache.struts.webapp.upload; 
import javax.servlet.http.HttpServletRequest; 
import org.apache.struts.action.*; 
import org.apache.struts.upload.*; 

/** 
 * <p>Title:UpLoadForm</p> 
 * <p>Description: QRRSMMS </p> 
 * <p>Copyright: Copyright (c) 2004 jiahansoft</p> 
 * <p>Company: jiahansoft</p> 
 * @author wanghw 
 * @version 1.0 
 */ 

public class UpLoadForm extends ActionForm { 
  public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded"; 
  protected FormFile theFile; 
  public FormFile getTheFile() { 
      return theFile; 
  } 
  public void setTheFile(FormFile theFile) { 
      this.theFile = theFile; 
  } 
   public ActionErrors validate( 
        ActionMapping mapping, 
        HttpServletRequest request) { 
             
        ActionErrors errors = null; 
        //has the maximum length been exceeded? 
        Boolean maxLengthExceeded = 
            (Boolean) request.getAttribute( 
                MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED); 
                 
        if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue())) { 
            errors = new ActionErrors(); 
            errors.add( 
                ActionMessages.GLOBAL_MESSAGE , 
                new ActionMessage("maxLengthExceeded")); 
            errors.add( 
                ActionMessages.GLOBAL_MESSAGE , 
                new ActionMessage("maxLengthExplanation")); 
        } 
        return errors; 

    } 

} 


-------------------------------------------------------------------------------- 
五、处理上传的文件：UpLoadAction.java  
-------------------------------------------------------------------------------- 
package org.apache.struts.webapp.upload; 
import java.io.*; 
import javax.servlet.http.*; 
import org.apache.struts.action.*; 
import org.apache.struts.upload.FormFile;  

/** 
 * <p>Title:UpLoadAction</p> 
 * <p>Description: QRRSMMS </p> 
 * <p>Copyright: Copyright (c) 2004 jiahansoft</p> 
 * <p>Company: jiahansoft</p> 
 * @author wanghw 
 * @version 1.0 
 */ 

public class UpLoadAction extends Action { 
  public ActionForward execute(ActionMapping mapping, 
                               ActionForm form, 
                               HttpServletRequest request, 
                               HttpServletResponse response) 
      throws Exception { 
       if (form instanceof UpLoadForm) {//如果form是UpLoadsForm 
           String encoding = request.getCharacterEncoding(); 

       if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8"))) 
        { 
            response.setContentType("text/html; charset=gb2312"); 
        } 
        UpLoadForm theForm = (UpLoadForm ) form; 
        FormFile file = theForm.getTheFile();//取得上传的文件 
        String contentType = file.getContentType(); 

        String size = (file.getFileSize() + " bytes");//文件大小 
        String fileName= file.getFileName();//文件名 
        try { 
          InputStream stream = file.getInputStream();//把文件读入 
          String filePath = request.getRealPath("/");//取当前系统路径 
          ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
          OutputStream bos = new FileOutputStream(filePath + "/" + 
                                                  file.getFileName()); 
              //建立一个上传文件的输出流，将上传文件存入web应用的根目录。 
          //System.out.println(filePath+"/"+file.getFileName()); 
          int bytesRead = 0; 
          byte[] buffer = new byte[8192]; 
          while ( (bytesRead = stream.read(buffer, 0, 8192)) != -1) { 
            bos.write(buffer, 0, bytesRead);//将文件写入服务器 
          } 
          bos.close(); 
          stream.close(); 
        }catch(Exception e){ 
          System.err.print(e); 
        } 
        //request.setAttribute("dat",file.getFileName()); 
         request.setAttribute("contentType", contentType); 
         request.setAttribute("size", size); 
         request.setAttribute("fileName", fileName); 

        return mapping.findForward("display"); 
    } 
    return null; 
  } 
} 
------------------------------------------------------------------------------------------ 

五、成功页display.jsp  
<%@ page contentType="text/html; charset=GBK" %> 
<%@ page import="org.apache.struts.action.*, 
                 java.util.Iterator, 
                 org.apache.struts.Globals" %> 
<%@ taglib uri="/tags/struts-html" prefix="html" %> 


上传成功！上传信息如下： 
<p> 
<b>The File name:</b> <%= request.getAttribute("fileName") %> 
</p> 
<p> 
<b>The File content type:</b> <%= request.getAttribute("contentType") %> 
</p> 
<p> 
<b>The File size:</b> <%= request.getAttribute("size") %> 
</p> 
<hr /> 
<hr /> 
<html:link module="/upload" page="/upload.do"> 继续上传</html:link></h2> 
 六、测试 
 从本站下载整个目录结构TestStruts并放入tomcat的webapps目录下，在浏览器中输入： 
http://127.0.0.1:8080/TestStruts/upload/upload.do 

[zuoyangguang]

报错是正常的，我要的是报错后的actionform里的值能被显示在页面上，my god

[NewSpaceOnMyWay]

看！1L

[shine333]

当然了，他是只检查HTTP头的，如果file的multipart的HTTP头的Content-Length大于设定，整个请求就不再读入ActionForm(populate)。你需要类似1F的方式，报错，让用户重新提交

[Defonds]

struts1.2上传图片源代码(包含检查文件格式、限制文件大小功能)

[zalbelieve]

瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！瞧下吧！