Struts的文件上传

Struts的文件上传
本文用的是Struts1.1的org.apache.struts.upload.FormFile类。很方便，不用自己写。也不用写一个jsp调用jspsmartupload就可以搞定。

选择上传文件页面：selfile.jsp



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<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<html:html>
<html:form action="/uploadsAction.do" enctype="multipart/form-data">
<html:file property="theFile"/>
<html:submit/>
</html:form>
</html:html>

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UpLoadAction.java
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import java.io.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;



public class UpLoadAction extends Action {
 <wbr> </wbr><wbr>public ActionForward execute(ActionMapping mapping,
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> ActionForm form,
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> HttpServletRequest request,
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> HttpServletResponse response)
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>throws Exception {
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>if (form instanceof uploadsForm) {//如果form是uploadsForm
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>String encoding = request.getCharacterEncoding();
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8")))
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>{
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>response.setContentType("text/html; charset=gb2312");//如果没有指定编码，编码格式为gb2312
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>}
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>UpLoadForm theForm = (UpLoadForm ) form;
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>FormFile file = theForm.getTheFile();//取得上传的文件
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>try {
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>InputStream stream = file.getInputStream();//把文件读入
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>String filePath = request.getRealPath("/");//取当前系统路径
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>ByteArrayOutputStream baos = new ByteArrayOutputStream();
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>OutputStream bos = new FileOutputStream(filePath + "/" +
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>file.getFileName());//建立一个上传文件的输出流
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>//System.out.println(filePath+"/"+file.getFileName());
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>int bytesRead = 0;
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>byte[] buffer = new byte[8192];
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>while ( (bytesRead = stream.read(buffer, 0, 8192)) != -1) {
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>bos.write(buffer, 0, bytesRead);//将文件写入服务器
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>}
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>bos.close();
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>stream.close();
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>}catch(Exception e){
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>System.err.print(e);
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>}
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>//request.setAttribute("dat",file.getFileName());
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>return mapping.findForward("display");
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>}
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>return null;
 </wbr><wbr> </wbr><wbr>}
}



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UpLoadForm.java

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import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import org.apache.struts.upload.*;



public class UpLoadForm extends ActionForm {
 </wbr><wbr> </wbr><wbr>public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded";
 </wbr><wbr> </wbr><wbr>protected FormFile theFile;
 </wbr><wbr> </wbr><wbr>public FormFile getTheFile() {
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>return theFile;
 </wbr><wbr> </wbr><wbr>}
 </wbr><wbr> </wbr><wbr>public void setTheFile(FormFile theFile) {
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>this.theFile = theFile;
 </wbr><wbr> </wbr><wbr>}
 </wbr><wbr> </wbr><wbr>public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
 </wbr><wbr> </wbr><wbr>{
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>ActionErrors errors = null;
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>//has the maximum length been exceeded?
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>Boolean maxLengthExceeded = (Boolean)
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>request.getAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue()))
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>{
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>errors = new ActionErrors();
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new ActionError("maxLengthExceeded"));
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>}
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr>return errors;

 </wbr><wbr> </wbr><wbr>}
}
//这是相对应的form，还有其他属性可以设置，具体可以参考struts的上传例子。




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struts-config.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
 </wbr><wbr> </wbr><wbr><form-beans>
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr><form-bean name="uploadsForm" type="UpLoadForm" />
 </wbr><wbr> </wbr><wbr></form-beans>
 </wbr><wbr> </wbr><wbr><action-mappings>
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr><action name="uploadsForm" type="UpLoadAction" path="/uploadsAction">
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr><forward name="display" path="/display.jsp" />
 </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></action>
 </wbr><wbr> </wbr><wbr></action-mappings>
</struts-config>
<!--display.jsp就是随便写一个成功页-->