Descargar Archivo con Struts 2 Ejemplo
Ejemplos para descargar un archivo desde Struts2
Características:
- Ejemplo 1 descarga directa del fichero.
- Ejemplo 2 descarga dinámica de fichero con parámetro.
- Página de error con mensaje 404 de fichero no encontrado
- Toma la ruta del contexto del Servlet.
Descarga ar desplegable con los fuentas aquí
Ejemplo 1
package com.test.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import javax.servlet.ServletContext;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;
import com.opensymphony.xwork2.ActionSupport;
@Namespace("/")
@Results({ @Result(name = "error", location = "/error", type = "redirect") })
public class ExampleDownload1 extends ActionSupport {
private static final long serialVersionUID = -7434672720094336409L;
private static ServletContext servletContext = ServletActionContext.getServletContext();
private static String webContentRoot = servletContext.getRealPath("/");
private static final String pathToFile = webContentRoot + "zip/file.zip";
private InputStream inputStream;
@Action(value = "/file.zip",
results = { @Result(name = "success", type = "stream",
params = { "contentType", "application/octet-stream",
"bufferSize", "1024"
}) })
public String execute() throws Exception {
try {
inputStream = new FileInputStream(new File(pathToFile));
} catch (Exception e) {
return ERROR;
}
return SUCCESS;
}
public InputStream getInputStream() {
return inputStream;
}
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
}
Ejemplo 2
package com.test.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import javax.servlet.ServletContext;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;
import com.opensymphony.xwork2.ActionSupport;
@Namespace("/")
@Results({ @Result(name = "error", location = "error", type = "redirect") })
public class ExampleDownload2 extends ActionSupport {
private static final long serialVersionUID = -7434672720094336410L;
private static ServletContext servletContext = ServletActionContext.getServletContext();
private static String webContentRoot = servletContext.getRealPath("/");
private InputStream inputStream;
private String fileName;
@Action(value = "/download",
results = { @Result(name = "success", type = "stream",
params = { "contentType", "application/octet-stream",
"inputName", "inputStream",
"bufferSize", "1024",
"contentDisposition","filename=\"${fileName}\"" }) })
public String execute() throws Exception {
String pathToFile = webContentRoot + "zip/" + fileName;
try {
inputStream = new FileInputStream(new File(pathToFile));
} catch (Exception e) {
return ERROR;
}
return SUCCESS;
}
public InputStream getInputStream() {
return inputStream;
}
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
}
Pagina no encontrada
package com.test.action;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Actions;
import org.apache.struts2.convention.annotation.Result;
import com.opensymphony.xwork2.ActionSupport;
public class Error extends ActionSupport{
private static final long serialVersionUID = 2086900467866735407L;
@Actions({
@Action(value = "/error", results = @Result(name = "success", location = "/error.jsp")) })
public String execute() {
ServletActionContext.getResponse().setStatus(
HttpServletResponse.SC_NOT_FOUND);
return SUCCESS;
}
}
