利用HttpClient进行http文件上传

1. java.lang.NoClassDefFoundError: org/apache/commons/codec/DecoderException 的解决办法

用cacuts做单元测试servlet时候总报这个错误，原来是bin文件缺少了要一个包commons-codec-1.x.jar 网络编程HttpClient 要一个包commons-codec-1.x.jar HttpClient 用到了 Apache Jakarta common 下的子项目 codec，你可以从这个地址http://commons.apache.org/downloads/download_codec.cgi 下载到最新的 common codec，从下载后的压缩包中取出 commons-codec-1.x.jar 加到 CLASSPATH 中

commons-codec-1.4-bin.zip

应用程序部分：

注意：要载入commons-httpclient-3.1.jar commons-codec.jar commons-logging.jar这三个包

import java.io.File;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.HttpStatus;

import org.apache.commons.httpclient.methods.PostMethod;

import org.apache.commons.httpclient.methods.multipart.FilePart;

import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;

import org.apache.commons.httpclient.methods.multipart.Part;

public class Hclient

{

public static void main(String args[])

{

String targetURL = null;// TODO 指定URL

File targetFile = null;// TODO 指定上传文件

targetFile = new File("1.mp3");

targetURL = "http://localhost:8080/test/tt"; //servleturl

PostMethod filePost = new PostMethod(targetURL); //若没有commons-codec-1.4-bin.zip, 这里将会出错

try

{

//通过以下方法可以模拟页面参数提交

//filePost.setParameter("name", "中文");

//filePost.setParameter("pass", "1234");

Part[] parts = { new FilePart(targetFile.getName(), targetFile) };

filePost.setRequestEntity(new MultipartRequestEntity(parts,filePost.getParams()));

HttpClient client = new HttpClient();

client.getHttpConnectionManager().getParams().setConnectionTimeout(5000);

int status = client.executeMethod(filePost);

if (status == HttpStatus.SC_OK)

{

System.out.println("上传成功");

// 上传成功

}

else

{

System.out.println("上传失败");

// 上传失败

}

}

catch (Exception ex)

{

ex.printStackTrace();

}

finally

{

filePost.releaseConnection();

}

}

}

servlet部分：

注意：需求载入commons-fileupload-1.2.1.jar commons-io.jar这两个包

package servlet;

import java.io.File;

import java.io.IOException;

import java.util.Iterator;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class TestServlets extends HttpServlet

{

private String uploadPath = "D:\\temp"; // 上传文件的目录

private String tempPath = "d:\\temp\\buffer\\"; // 临时文件目录

File tempPathFile;

public void init() throws ServletException {

File uploadFile = new File(uploadPath);

if (!uploadFile.exists()) {

uploadFile.mkdirs();

}

File tempPathFile = new File(tempPath);

if (!tempPathFile.exists()) {

tempPathFile.mkdirs();

}

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException

{

try

{

// Create a factory for disk-based file items

DiskFileItemFactory factory = new DiskFileItemFactory();

// Set factory constraints

factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb

factory.setRepository(tempPathFile);// 设置缓冲区目录

// Create a new file upload handler

ServletFileUpload upload = new ServletFileUpload(factory);

// Set overall request size constraint

upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB

List<FileItem> items = upload.parseRequest(request);// 得到所有的文件

Iterator<FileItem> i = items.iterator();

while (i.hasNext())

{

FileItem fi = (FileItem) i.next();

String fileName = fi.getName();

if (fileName != null)

{

File fullFile = new File(fi.getName());

File savedFile = new File(uploadPath, fullFile.getName());

fi.write(savedFile);

}

}

System.out.print("upload succeed");

}

catch (Exception e)

{

System.out.println(e.getMessage());

// 可以跳转出错页面

e.printStackTrace();

}

}

}

在web.xml中添加映射，就可以实现应用程序上传文件到servlet的功能了。

下面是一个例子的war文件：

fileUpload.zip

解压之后会先得到一个war，密码FileUpload123

转载地址： http://www.cnblogs.com/zhangxz/archive/2010/09/06/1819333.html
感谢作者终于找到一片关于上传