小编Bab*_*u R的帖子

当我从服务器读取文件内容时,它返回以下错误消息:

Caused by: java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:215)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:462)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:366)
at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:240)
at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:119)
at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:192)
at org.apache.coyote.Response.doWrite(Response.java:504)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:383)
... 28 more

我的servlet程序是

 response.setContentType("application/octet-stream");
 response.setHeader("Content-Disposition","attachment;filename="+filename);
 FileInputStream in = new FileInputStream(new File(filepath));
 ServletOutputStream output=response.getOutputStream();
 byte[] outputByte=new byte[4096];
 while(in.read(outputByte,0,4096)!=-1){
     output.write(outputByte,0,4096);//error indicates in this line
 }
 in.close();
 output.flush();
 output.close();

如何解决这个问题？

嗨我想将包含标签和按钮等组件的面板转换为图像文件.

我已经完成了以下代码.图像已保存.但面板的内容不可见或保存.任何人都可以告诉我如何使用其组件保存面板.

码:

package PanelToImage;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.*;

public class sample extends JPanel {

public JPanel firstpanel;
public JPanel secondpanel;
JLabel label1, label2;
JButton button1, button2;

public sample() {
    firstpanel = new JPanel();
    firstpanel.setSize(400,300); 
    firstpanel.setBackground(Color.RED);
    secondpanel = new JPanel();
    secondpanel.setBackground(Color.GREEN);
    secondpanel.setSize(400,300); 

    label1 = new JLabel("label1");
    label2 = new JLabel("label2");
    button1 = new JButton("button1");
    button2 = new JButton("button2");

    firstpanel.add(label1);
    firstpanel.add(button1);

    secondpanel.add(label2);
    secondpanel.add(button2);

    saveImage(firstpanel);

    add(firstpanel);

    // add(secondpanel);
}

public static void main(String args[]) {

    JFrame …

我想获得根节点的所有子节点.

例如:

Root
   child1
      child1.child1
   child2
      child2.child1

现在我想得到两个名为"child1"和"child2"的子节点.

怎么做？有可能吗？

请帮帮我,提前谢谢..

我希望在字符串中每两个字符后添加空格.

例如:

javastring 

我想把它变成:

ja va st ri ng

我怎样才能做到这一点？

我想从一个完整的单词中获取String的特定部分.

例如:

我有以下字符串.

# STRING_VALUES #

一句话如下

<p># STRING_VALUE #<br /># CMESSAGE #<br /># CUSTOMERADDRESS #<br /><br /></p>

从上面,我想得到如下字符串:

STRING_VALUES
CMESSAGE
CUSTOMERADDRESS

如何获取上面的字符串？我坚持这个.

如何在jfreechart中加粗 x和y轴值？

当我将子节点插入根节点时,根节点不会自动展开.

我想在将子节点插入根节点后自动扩展根节点.

提前致谢..

嗨,我是JavaMail的新手.

我想上传一个文件作为附件.它只存储文件名.

文件仅使用文件名成功附加,而不是该文件的内容.

如何解决它.提前致谢...

我试过以下代码:

Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(fromAddress));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(toAddr));

        if (subject == null) {
            message.setSubject("");
        } else {
            message.setSubject(subject);
        }

        if (attachedFile == null || attachedFile.equalsIgnoreCase("")) {
            if (content == null) {
                message.setText("");
            } else {
                message.setText(content);
            }

        } else {
            // Create the message part
            BodyPart messageBodyPart = new MimeBodyPart();

            if (content == null) {
                messageBodyPart.setText("");
            } else {
                messageBodyPart.setText(content);
            }

            // Create a multipar message
            Multipart multipart = new MimeMultipart();

            // Set text …