struts2文件下载 注意中文问题

1.页面

<ahref="downAction?filename=要下载的文件名">要下载的文件名</a>

2.DownAction

import java.io.InputStream;

import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public
class DownAction extends ActionSupport {
private String
filename;
public String getFilename() {
return
filename;
}
public
void setFilename(Stringfilename) {
try {

this.filename =
newString(filename.getBytes("ISO-8859-1"),"UTF-8");
}catch(UnsupportedEncodingException e) {
e.printStackTrace();
}
}
public InputStream getInputStream(){
HttpServletResponse response =ServletActionContext.getResponse();
try {
response.setHeader("Content-Disposition","attachment;fileName="+java.net.URLEncoder.encode(filename,"UTF-8"));

}catch(UnsupportedEncodingException e) {
e.printStackTrace();
}
return ServletActionContext.getServletContext().
getResourceAsStream("/up/"+filename);
}
@Override
public String execute()
throws Exception {
System.err.println("InputStream:"+getInputStream());
此处最好打印以下测试看看是否获取到输出流
System.err.println("下载:" + getFilename()+">>>>>>"+ServletActionContext.getServletContext().
getRealPath(getFilename()));
return
SUCCESS;
}
}

3.struts.xml

<package
name="user"
extends="struts-default"namespace="/">

<!—-引用拦截器 -->
<default-interceptor-ref
name="defaultStack"></default-interceptor-ref>
<action
name="downAction"
class="czb.hr.user.action.DownAction">

<result name="success"
type="stream">

<!-- 调用getFile方法 -->

<param name="inputName">InputStream</param>

<!-- 以下会下载图片,注意第一个参数 -->

<param name="contentDisposition">attachment;filename="${filename}"</param>

<param name="bufferSize">4096</param>

</result>

<exception-mapping
result="error"
exception="java.lang.Exception"></exception-mapping>
</action>

</package>