点击下载提示java.io.FileInputStream cannot be cast to java.lang.String
//Action
private List<File> upload;
private List<String> uploadContentType;
private List<String> uploadFileName;
private String result;
private String inputPath;
private String filename;
set/get方法省略
@Override
public String execute() throws Exception {
if(upload==null){
result = "请选择文件";
return INPUT;
}
String path = ServletActionContext.getServletContext().getRealPath("/images");
System.out.println(path);
File file = new File(path);
if(!file.exists()){
file.mkdirs();
}
int i=0;
//循环将批量上传的文件保存到本地
for (i = 0; i < upload.size(); i++) {
FileUtils.copyFile(upload.get(i), new File(file,uploadFileName.get(i)));
}
System.out.println("共上传了："+i+"个文件");
result="上传成功";
return SUCCESS;
}
/*
* 下载action
*/
public InputStream getDownload() throws IOException{
String path = ServletActionContext.getServletContext().getRealPath("/images/");
String filepath = path+filename;
System.out.println("路径为："+filepath);
File file = new File(filepath);
//像页面输出流
return FileUtils.openInputStream(file);
}
//配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!-- 配置临时文件位置 -->
<constant name="struts.multipart.saveDir" value="/tmp"/>
<!-- 配置国际化信息 对应app是指配置文件的基础名称 里面key为异常信息，value为提示信息 -->
<constant name="struts.custom.i18n.resources" value="app"></constant>
<package name="uploadAndDownload" extends="struts-default">
<action name="uploadAndDownload3" class="com.imooc.action.BatchUploadAndDownloadAction">
<result>/03.jsp</result>
<result name="input">/03.jsp</result>
<!-- 配置拦截器 -->
<interceptor-ref name="fileUpload">
<param name="allowedTypes">image/jpeg,image/png</param>
<param name="maximumSize">2M</param>
</interceptor-ref>
<!-- 配置默认拦截器 如果不配置则获取不到file-->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<action name="download3" class="com.imooc.action.BatchUploadAndDownloadAction" method="getDownload">
<param name="inputPath">/images/img2-lg.jpg</param>
<result type="stream">
<param name="contentType">application/octet-stream</param>
<!-- 由getDownloadFile（）获得inputStream -->
<param name="inputName">download</param>
<param name="contentDisposition">attachment;filename="${filename}"</param>
<param name="bufferSize">8192</param>
</result>
</action>
</package>
</struts> //页面
<a href="download3?filename=img2-lg.jpg">测试.jpg</a> ${error}
没有找到到底错在哪里，点下载就报错，找了好久没找到原因啊~~~
