Hello.
This is a Struts 2 example to show the use of custom result type to
download file.
I have in jsp :
- 1 password textfield
- 1 submit button
If I push submit button without insert a password I correctly obtain a
field error "Field required!".
Then If I set "XYZ" password (correct password), I correctly download
"downloadfile.txt" but
field error remain.
Why?
Thanks
DownloadAction.java
package com.example.common.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import com.opensymphony.xwork2.ActionSupport;
public class DownloadAction extends ActionSupport{
private InputStream fileInputStream;
private String password;
public InputStream getFileInputStream() {
return fileInputStream;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public void validate() {
if ( (password==null) || (password.trim().equals("")) ) {
addFieldError("password", "Field required!");
}
if (!password.equals("XYZ") {
addFieldError("password", "Wrong password!");
}
}
public String execute() throws Exception {
fileInputStream = new FileInputStream(new File
("C:\\downloadfile.txt"));
return SUCCESS;
}
}
downloadPage.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<body>
<h1>Struts 2 download file example</h1>
<s:form action="download" method="POST">
<p><s:textfield name="password" /></p>
<p><s:submit id="submitButton"/></p>
</s:form>
</body>
</html>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd";>
<struts>
<constant name="struts.devMode" value="true" />
<package name="default" namespace="/" extends="struts-default">
<action name="">
<result name="success">pages/downloadPage.jsp</result>
</action>
<action name="download"
class="com.example.common.action.DownloadAction">
<interceptor-ref name="defaultStack" />
<result name="success" type="stream">
<param name="contentType">application/octet-stream</param>
<param name="inputName">fileInputStream</param>
<param
name="contentDisposition">attachment;filename="fileABC.txt"</param>
<param name="bufferSize">1024</param>
</result>
</action>
</package>
</struts>
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