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Tomcat无法保存到临时文件夹?[副本]

image-uploading primefaces jsf tomcat eclipse

Gishas · 技术社区 · 6 年前

    <h:form>
...

<p:fileUpload id="slike" fileUploadListener="#{oglasBean.handleFileUpload}" cancelLabel="OtkaÅ¾i" label="Dodaj" 
mode="advanced" dragDropSupport="false" allowTypes="/(\.|\/)(gif|jpe?g|png)$/" update="poruka"/>
<div/>
    <br />
    <p:commandButton value="Dodaj oglas"
        action="#{oglasBean.dodajOglas()}" />
...
    </h:form>

备份bean代码:

public void handleFileUpload(FileUploadEvent event) {   
    System.out.println(event.getFile().getFileName());
            oglas.setSlika(event.getFile());            
}

public void dodajOglas(){

    Date datum = new Date();
    oglas.setDatumKreiranja(datum);
    if(oglas.getVrsta().equals("besplatan")){
        oglas.setTrajanje(1);
        oglas.setCijena(0);
    }
    else{

    }

    if (OglasDAO.dodajOglas(oglas)) {
        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO,"UspjeÅ¡no ste dodali sliku.", "");
        FacesContext.getCurrentInstance().addMessage(null, message);
    }
    else{
        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR,"Dodavanje slike nije uspjelo!", "");
        FacesContext.getCurrentInstance().addMessage(null, message);
    }
}

用于添加到数据库的DAO方法,实际上是问题所在:

import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;

import net.etfbl.traveladvertiser.model.Oglas;

public class OglasDAO {
private static String DODAJ_OGLAS = "insert into oglas values (tekst, slika, 
vrsta, trajanje) values (?, ?, ?, ?)";

public static boolean dodajOglas(Oglas oglas){
    Connection conn = null;
    try{
        conn = ConnectionPool.getConnectionPool().checkOut();
        PreparedStatement stm = conn.prepareStatement(DODAJ_OGLAS);
        InputStream instream = oglas.getSlika().getInputstream();
        stm.setString(1, oglas.getTekst());
        stm.setBinaryStream(2, instream, oglas.getSlika().getSize());
        stm.setString(3, oglas.getVrsta());
        stm.setInt(4, oglas.getTrajanje());

        stm.executeUpdate();
        stm.close();
        return true;
    }
    catch(Exception ex){
        ex.printStackTrace();
        return false;
    }
    finally{
        ConnectionPool.getConnectionPool().checkIn((com.mysql.jdbc.Connection) conn);
    }
}

}

它在刀口断了

InputStream instream = oglas.getSlika().getInputstream();

带着信息:

java.io.FileNotFoundException: C:\Program Files\Apache Software Foundation\Tomcat 7.0\work\Catalina\localhost\TravelAdvertiser\upload_fd4813af_24f6_485e_a865_5aa9be1a871d_00000019.tmp (The system cannot find the file specified)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at org.apache.tomcat.util.http.fileupload.disk.DiskFileItem.getInputStream(DiskFileItem.java:188)
at org.apache.catalina.core.ApplicationPart.getInputStream(ApplicationPart.java:99)
at org.primefaces.model.NativeUploadedFile.getInputstream(NativeUploadedFile.java:45)
at net.etfbl.traveladvertiser.DAO.OglasDAO.dodajOglas(OglasDAO.java:17)
at net.etfbl.traveladvertiser.beans.OglasBean.dodajOglas(OglasBean.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
...

我的猜测是Tomcat由于某种原因无法写入temp文件夹。奇怪的是,它实际上包含了我昨天用这个应用上传的一些文件,而且它刚刚停止工作。所以,也许问题是我忘记了代码中的一些小东西(做了很多修改和试验)?

1 回复 | 直到 6 年前

Gishas 6 年前

感谢@Kukeltje的评论,我找到了 How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throws an error / not usable

它是:

还要注意,您应该立即在上述方法中读取文件内容,而不是在稍后的HTTP请求调用的其他bean方法中读取。这是因为上载的文件内容是请求范围的,因此在稍后的/不同的HTTP请求中不可用。在以后的请求中读取它的任何尝试都很可能在临时文件上出现java.io.FileNotFoundException。

我做错了,似乎是我试图在handleFileUpload方法中设置Bean属性,然后在下一个请求中使用另一个方法读取该属性,而该方法不再可用。为了解决这个问题,我用handleFileUpload方法将它保存到数据库中,然后通过另一个方法更新其他字段。也许不是最漂亮或最理想的解决方案,但它现在对我有效。

谢谢大家的快速反应!!!我离考试只剩下几天了,这种帮助是无价的!