Question

java客户端通过http发送POST请求上传文件

java客户端代码：
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.net.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.util.*;
public class Upload
{
public Upload(){
String filePath="D:\\DataSocketServer.java";
String fileName="DataSocketServer.java";
try{
URL url=new URL("http://localhost:8080//TestServlet3");
HttpURLConnection connection=(HttpURLConnection)url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
BufferedOutputStream out=new BufferedOutputStream(connection.getOutputStream());
File file=new File(filePath);
FileInputStream fis=new FileInputStream(file);
byte[] bytes=new byte[1024];
int numReadByte=0;
while((numReadByte=fis.read(bytes,0,1024))>0){
out.write(bytes,0,numReadByte);
}
out.flush();
fis.close();
}catch(Exception e){
e.printStackTrace();
}
}
public static void main(String[] args){
new Upload();
}
}

Servlet代码：
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

public class TestServlet3 extends HttpServlet
{
private static final long serialVersionUID=1L;
public void init(ServletConfig config) throws ServletException{
super.init(config);
}
public void destroy(){
super.destroy();
}
public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
doPost(request,response);

}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
BufferedInputStream in=new BufferedInputStream(request.getInputStream());
FileOutputStream fos=new FileOutputStream(new File("J:\\aaa.java"));
byte[] inputByte = new byte[1024];
int length=0;
while((length=in.read(inputByte,0,inputByte.length))>0){
fos.write(inputByte,0,length);
fos.flush();
}
fos.close();
}
}
为什么java客户端上传不了文件。我试了下载可以，上传不可以。

Answer 1

这样的写法，是直接socket的做法。

如果是HTTP的，要按HTTP的协议进行。先了解一下multi-part的post