对于enform仅能遍历一次的应对策略

对于那个只能访问一次的request，我用一个类封装两个字段List，分别是string字段和文件字段List,遍历一次request中的Item，按照不同的字段分别存在不同的List中，然后把装满字段的类返回到需要用到的页面

package get;

import java.sql.Blob;

public class File_ {
    String FieldName;
    Blob Value;

    public void setFieldName(String set){
        this.FieldName=set;
    }
    public void setValue(Blob set){
        this.Value=set;
    }
    public String getFieldName(){
        return this.FieldName;
    }
    public Blob getValue(){
        return this.Value;
    }
}

package get;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.http.HttpServletRequest;
import javax.sql.rowset.serial.SerialBlob;
import java.io.*;
import java.sql.Blob;
import java.sql.SQLException;
import java.util.List;

public class Get {
    public Blob f_b(File_ file){//fil_blob
        String FILE="";
        try {
            InputStream InputStream=new FileInputStream(String.valueOf(file));
            int bit;
            while((bit=InputStream.read())!=-1){
                FILE=FILE+Integer.toBinaryString(bit);
            }
            InputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] buff = FILE.getBytes();
        Blob blob = null;
        try {
            blob = new SerialBlob(buff);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return blob;
    }

    public Blob in_b(InputStream inputStream){//inputstreamתblob
        String FILE="";
        try {
            InputStream InputStream=inputStream;
            int bit;
            while((bit=InputStream.read())!=-1){
                FILE=FILE+Integer.toBinaryString(bit);
            }
            InputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] buff = FILE.getBytes();
        Blob blob = null;
        try {
            blob = new SerialBlob(buff);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return blob;
    }

    public It enform_getITEM(HttpServletRequest request) throws FileUploadException,IOException {//�õ��ϸ�ҳ����ı��ֶ�
        It it=new It();
        DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();
        ServletFileUpload servletFileUpload=new ServletFileUpload(diskFileItemFactory);
        servletFileUpload.setHeaderEncoding("UTF-8");
        List<FileItem> fileItem = servletFileUpload.parseRequest(request);
        for(FileItem item:fileItem) {
            String name_ = item.getFieldName();
            if (item.isFormField()) {
                String value = item.getString("UTF-8");
                Text_ text=new Text_();
                text.setFieldName(name_);
                text.setValue(value);
                it.t.add(text);
            }
            else {
                 InputStream in = item.getInputStream();
                 Blob b=this.in_b(in);
                 File_ file=new File_();
                 file.setFieldName(name_);
                 file.setValue(b);
                 it.f.add(file);
                 in.close();
            }
        }
        return it;
    }
    public String get_text(String FieldName,It it){
        for(Text_ the:it.t){//找出无法识别的原因
            if(FieldName.equals(the.getFieldName())){
                return the.getValue();
            }
        }
        return "";
    }
    public Blob get_file(String FieldName,It it){
        for(File_ the:it.f){
            if(FieldName.equals(the.getFieldName())){
                return the.getValue();
            }
        }
        return null;
    }
//    public Blob enform_Blob_get(HttpServletRequest request, String get) throws IOException,FileUploadException {//�õ��ϸ�ҳ���ļ��ֶ�
//        DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();
//        ServletFileUpload servletFileUpload=new ServletFileUpload(diskFileItemFactory);
//        servletFileUpload.setHeaderEncoding("GBK");
//        List<FileItem> fileItem =  servletFileUpload.parseRequest(request);
//        for(FileItem item:fileItem) {
//            String name_ = item.getFieldName();
//            if (!item.isFormField()) {
//                if (get.equals(name_)) {
//                    InputStream in = item.getInputStream();
//                    Blob b=this.in_b(in);
//                    in.close();
//                    return b;
//                }
//            }
//        }
//        return null;
//    }
}


package get;

import java.util.ArrayList;
import java.util.List;

public class It {
    public List<File_> f;
    public List<Text_> t;
    public It(){
        f=new ArrayList<>();
        t=new ArrayList<>();
    }
}


package get;

public class Text_ {
    private String FieldName;
    private String Value;

    public void setFieldName(String set){
        this.FieldName=set;
    }
    public void setValue(String set){
        this.Value=set;
    }
    public String getFieldName(){
        return this.FieldName;
    }
    public String getValue(){
        return this.Value;
    }
}