javaBean上传文件如何写?

Question

<jsp:useBean id="su" scope="page" class="com.jspsmart.upload.SmartUpload" />
<%
su.initialize(pageContext);
su.upload();
int count = su.save("/upload", su.SAVE_VIRTUAL);
out.println(count+"个文件上传成功！<br>");
for (int i=0;i<su.getFiles().getCount();i++)
{
com.jspsmart.upload.File file = su.getFiles().getFile(i);
if (file.isMissing()) continue;
out.println("<br>文件名：" + file.getFileName()+"　长度："+file.getSize());
}
%>
以上代码如何写成javabean如下形式public boolean upload() throws Exception {
    .................................
        }

Answer 1

import com.jspsmart.upload.SmartUpload;public boolean upload() throws Exception {
    HttpServletRequest request = null;
    HttpServletResponse response = null;
    JspFactory _jspxFactory = null;
    PageContext pageContext = null;
    _jspxFactory = JspFactory.getDefaultFactory();
    pageContext = _jspxFactory.getPageContext(this, request, response, "", true,
                                              8192, true);
    SmartUpload su = new SmartUpload();
    su.initialize(pageContext);
    su.upload();
    int count = su.save("/upload", su.SAVE_VIRTUAL);
    out.println(count + "个文件上传成功！<br/>");
    for (int i = 0; i < su.getFiles().getCount(); i++) {
        com.jspsmart.upload.File file = su.getFiles().getFile(i);
        if (file.isMissing())
            continue;
        out.println("<br/>文件名：" + file.getFileName() + "　长度：" + file.getSize());
    }
}

Answer 2

String fName=file.getFileName();
InputStream fileStreamIn=file.getInputStream();
OutputStream fileStreamOut=new FileOutputStream(dir+"/"+fileName);//dir为上传后文件存放的地址int bytesRead=0;
byte[]buffer=new byte[8192];
whie((bytesRead=fileStreamIn.read(buffer,0,8192))!=-1){
  fileStreamOut.write(buffer,0,btyesRead);
}
fileStreamOut.close();
fileStreamIn.close();
以上程序载至Struts设计P320,
我的总结：流中读，流中写

Answer 3

在struts框架下定义一个Servlet,代码如下
package jspupload;import java.io.OutputStream;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;
/**
 * @author user
 *
 * TODO 要更改此生成的类型注释的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
public class UploadServlet extends HttpServlet{
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException{
try{

OutputStream out=null;
JspFactory _jspxFactory = null;

    _jspxFactory = JspFactory.getDefaultFactory();
    response.setContentType("text/html;charset=utf-8");
 // 新建一个SmartUpload对象
SmartUpload su = new SmartUpload();
// 上传初始化
PageContext pageContext = _jspxFactory.getPageContext(this, request, response,null, true, 8192, true);


su.initialize(pageContext);
// 将上传文件全部保存到指定目录
int count = su.save("/upload");下面的不用说拉

Answer 4

pageContext =_jspxFactory.getPageContext(this, request, response,null, true,8192,true);    
这句编译通不过呀!!!!!!!!!!!!!!!!!!
package cgx.run;import java.sql.*;
import java.util.Vector;
import cgx.util.*;
import cgx.op.*;
import com.jspsmart.upload.SmartUpload;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;public class op_upload extends DataBase{
private upload upload = new upload();
  private upload asps = new upload();                                 //新的类
        private javax.servlet.http.HttpServletRequest request;  //建立页面请求
private javax.servlet.http.HttpServletRequest response;  //建立页面请求
    JspFactory _jspxFactory = null;
    PageContext pageContext = null;

        private boolean sqlflag = true ;                 //对接收到的数据是否正确
        private Vector uploadlist;                         //显示商品列表向量数组
        public String sqlStr="";
        public Vector getuploadlist() {
                return uploadlist;
        }
        public boolean getSqlflag() {
                return sqlflag;
        }
        public String to_String( String str) {
                try
                {
                        return new String(str.getBytes("ISO8859-1"));
                }
                catch (Exception e)
                {
                        return str;
                }
        }
public boolean upload() throws Exception {

    _jspxFactory = JspFactory.getDefaultFactory();
    pageContext =_jspxFactory.getPageContext(this, request, response,null, true,8192,true);
    
com.jspsmart.upload.SmartUpload mySmartUpload=new com.jspsmart.upload.SmartUpload();

    mySmartUpload.initialize(pageContext);

mySmartUpload.upload();    int count =mySmartUpload.save("/upload", mySmartUpload.SAVE_VIRTUAL);

for (int i=0;i<mySmartUpload.getFiles().getCount();i++)
{
com.jspsmart.upload.File file = mySmartUpload.getFiles().getFile(i);
if (file.isMissing()) continue;

}
}        
  public op_upload() {
       }
}我的代码

Answer 5

package cgx.run;
/**
 * <p>管理商品的类，包括商品的修改、查询，删除，添加 </p>
 */
import java.sql.*;
import java.util.Vector;
import cgx.util.*;
import cgx.op.*;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;
public class op_upload extends DataBase{

  private upload asps = new upload();                                 //新的类
        private javax.servlet.http.HttpServletRequest request;  //建立页面请求
        private boolean sqlflag = true ;                 //对接收到的数据是否正确
        private Vector uploadlist;                         //显示商品列表向量数组
        public String sqlStr="";
        public Vector getuploadlist() {
                return uploadlist;
        }
        public boolean getSqlflag() {
                return sqlflag;
        }
        public String to_String( String str) {
                try
                {
                        return new String(str.getBytes("ISO8859-1"));
                }
                catch (Exception e)
                {
                        return str;
                }
        }
/**
* 将页面表单传来的资料分解
*/
public boolean getRequest(javax.servlet.http.HttpServletRequest newrequest) {
  boolean flag = false;
  try{
   request = newrequest;
   String ID = request.getParameter("id");
   long spid = 0;
   try{
           spid = Long.parseLong(ID);
   }catch (Exception e){
   }
   asps.setId(spid);   String FILE1 = request.getParameter("FILE1");
   if (FILE1==null || FILE1.equals(""))
   {
           FILE1 = "-";
           sqlflag = false;
   }
   asps.setFILE1(to_String(FILE1));   String FILE2 = request.getParameter("FILE2");
   if (FILE2==null || FILE2.equals(""))
   {
           FILE2 = "-";
           
   }
   asps.setFILE2(to_String(FILE2));   String FILE3 = request.getParameter("FILE3");;
   if (FILE3==null)
   {
           FILE3 = "-";
   sqlflag = false;
   }
   asps.setFILE3(to_String(FILE3));   
   
   String FILE4 = request.getParameter("FILE4");
   if (FILE4 == null)
   {
           FILE4 = "-";
   
   }
   asps.setFILE4(to_String(FILE4));
   
      if (sqlflag)
   {
           flag = true;
   }
   return flag;
                }catch (Exception e){
   return flag;
                }
        }public boolean upload() throws Exception {
    HttpServletRequest request = null;
    HttpServletResponse response = null;
    JspFactory _jspxFactory = null;
    PageContext pageContext = null;
    _jspxFactory = JspFactory.getDefaultFactory();
    

--->PageContext pageContext = _jspxFactory.getPageContext(this, request, response,null, true, 8192, true);
    
-------------编译出错语句-------------------------------


SmartUpload su = new SmartUpload();
    su.initialize(pageContext);
    su.upload();
    int count = su.save("/upload", su.SAVE_VIRTUAL);
    
    for (int i = 0; i < su.getFiles().getCount(); i++) {
        com.jspsmart.upload.File file = su.getFiles().getFile(i);
        if (file.isMissing())
            continue;
       
    }
}
        
  public op_upload() {
       }
}

Answer 6

如果用webwork+cos来做的话
上传文件简直就是一个享受