struts2的文件上传和下载
struts2的文件上传和下载
文件上传部分:
上传页面 upload.jsp
<s:form action ="upload" method ="POST" enctype ="multipart/form-data" >
<s:file name ="file" label ="上传文件"/>
<s:submit />
</s:form >
上传 UploadAction.java
private File file;

private String fileFileName;

private String fileContextType;

private String root;

private HttpServletRequest request;
private Map session;

@Override
public String execute() throws Exception {

session.put("fileFileName", fileFileName);

//取文件后缀名
String lastname=null;
int i = fileFileName.lastIndexOf('.');
lastname=fileFileName.substring(i+1);

//取当前日期
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar calendar = Calendar.getInstance();
String date=sdf.format(calendar.getTime());

//10亿的随机数
java.util.Random r=new java.util.Random();
String radom=String.valueOf(r.nextInt(1000000000));

fileFileName=date+radom+"."+lastname;

session.put("fname", fileFileName);

InputStream is=new FileInputStream(file);

root= ServletActionContext.getRequest().getRealPath("/upload") ;//存储到apache项目发布目录上
// String root="D:\\a1/upload";//存储到项目文件夹里

session.put("fpath", root);
File copyFile=new File(root,fileFileName);

OutputStream os=new FileOutputStream(copyFile);

byte[] buffer=new byte[400];

int length=0;

while( (length=is.read(buffer)) > 0 ){
os.write(buffer, 0, length);
}

is.close();

os.close();

return SUCCESS;
}
struts.xml配置
<action name="upload"
type="stream">
<param name="contentType">
application/octet-stream;charset=ISO8859-1
</param>
<param name="inputName">inputStream</param>
<!-- 使用经过转码的文件名作为下载文件名，downloadFileName属性
对应action类中的方法 getDownloadFileName() -->
<param name="contentDisposition">
attachment;filename="${downloadFileName}"
</param>
<param name="bufferSize">4096</param>
</result>
</action>
以上均为部分核心文件.


Unable to load bean org.apache.struts2.dispatcher.multipart.MultiPartRequest (jakarta) - [unknown location]

java.lang.NoClassDefFoundError: org/apache/commons/io/output/DeferredFileOutputStream

这两个错误的原因是缺少jar包.
commons-fileupload-1.2.1.jar
commons-io-1.4.jar


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