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;
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"
class="com.enorth.mpup.action.UploadAction">
<result name="success">uploadshow.jsp</result>
<result name="input">index.jsp</result>
</action>
文件下载部分:
下载页面 uploadshow.jsp
<a href="download.action" target="_blank">
<%=session.getAttribute("fileFileName") %>
</a>
下载 FileDownAction.java
private String fileName;// 初始的通过param指定的文件名属性
private String inputPath;// 指定要被下载的文件路径
private HttpServletRequest request;
private Map session;
public InputStream getInputStream() throws Exception {
// 通过 ServletContext，也就是application 来读取数据
inputPath="/upload/"+(String)session.get("fname");
return ServletActionContext.getServletContext().getResourceAsStream(inputPath);
}
public String execute() throws Exception {
return SUCCESS;
}
/** 提供转换编码后的供下载用的文件名 */
public String getDownloadFileName() {
fileName=(String) session.get("fname");
System.out.println(fileName);
String downFileName = fileName;
try {
downFileName = new String(downFileName.getBytes(), "ISO8859-1");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return downFileName;
}
struts.xml配置
<!-- 下载现有文件 -->
<action name="download" class="com.enorth.mpup.action.FileDownAction">
<!-- <param name="inputPath">/download/aaa.txt</param> -->
<!-- 初始文件名
<param name="fileName">aaa.txt</param>-->
<result name="success" 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) -
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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来自: http://hi.baidu.com/lichenblog/blog/item/25f02026da7a7b0b908f9dfc.html
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