Question

struts2中的s:file标签怎么限定上传文件为图片类型，最好是能在选择文件时就只能选择图片文件

Answer 1

<struts>
<package name="default" extends="struts-default">
<action name="upload" class="g2w.struts2.FileUploadAction">
<interceptor-ref name="fileUpload">
<param name="allowedTypes">
text/plain,text/css,text/javascript
</param>
<param name="maximumSize">1000000</param>
</interceptor-ref>
<interceptor-ref name="defaultStack" />
<param name="savePath">/uploads</param>
<result name="success">/success.jsp</result>
<result name="error">/failure.jsp</result>
<result name="input">/failure.jsp</result>
</action>
</package>
</struts>

package g2w.struts2;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport {
private static final long serialVersionUID = 1L;

private File file;
private String fileContentType;
private String fileFileName;

private String savePath;

// setters & getters

public String execute() {
try {
File destFile = new File(this.getSavePath(), fileFileName);
FileUtils.copyFile(this.file, destFile);
// ....
} catch (IOException e) {
this.setMessage(e.getMessage());
return ActionSupport.ERROR;
}
return SUCCESS;
}
}