利用HttpClient模拟form表单将文件上传到Servlet

今天项目中需要利用C语言将日志文件通过http方式上传到java-web中，为了自测，所以找到了一个HttpClient类，不过也可以用URLConnection来模拟；现在把代码贴出来，以备所需；

客户端代码：

/*
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 * and open the template in the editor.
 */
package upload;

import java.io.File; 
import java.io.IOException; 

import org.apache.commons.httpclient.HttpClient; 
import org.apache.commons.httpclient.HttpException; 
import org.apache.commons.httpclient.NameValuePair; 
import org.apache.commons.httpclient.methods.MultipartPostMethod; 
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; 
import org.apache.commons.httpclient.methods.multipart.StringPart; 

public class HttpClientUtile { 

public String uploadFiles(String strUrl, String[] strFiles) 
{ 
   String strResponse = null; 
   HttpClient httpClient = new HttpClient(); 
   MultipartPostMethod multipartPostMethod = new MultipartPostMethod(strUrl); 
   try { 
   
    for (int i = 0; i < strFiles.length; i++) { 
     multipartPostMethod.addPart(new FilePart("file"+i,new File(strFiles[i]))); 
    } 
    int statusCode = httpClient.executeMethod(multipartPostMethod); 
    if (statusCode == 200) { 
     strResponse = multipartPostMethod.getResponseBodyAsString(); 
    } 
   } catch (Exception e){ 
    e.printStackTrace(); 
   } 
   finally 
   { 
    multipartPostMethod.releaseConnection(); 
   } 
   return strResponse; 
} 
public String uploadFiles(String strUrl,String strFrom, String strFiles) 
{ 
   String strResponse = null; 
   HttpClient httpClient = new HttpClient(); 
   PostMethod postMethod = new PostMethod(strUrl); 
   try { 
    FilePart filePart = new FilePart("file","aa.txt",new File(strFiles)); 
    MultipartRequestEntity multipartRequestEntity = new MultipartRequestEntity(new Part[]{new StringPart("HIDDEN","from",strFrom),filePart},postMethod.getParams()); 

    postMethod.addParameter(new NameValuePair("from",strFrom)); 
   
    postMethod.setRequestEntity(multipartRequestEntity); 
   
    httpClient.getParams().setContentCharset("UTF-8"); 
    int statusCode = httpClient.executeMethod(postMethod); 
    if (statusCode == 200) { 
     strResponse = postMethod.getResponseBodyAsString(); 
    } 
   } catch (Exception e){ 
    e.printStackTrace(); 
   } 
   finally 
   { 
    postMethod.releaseConnection(); 
   } 
   return strResponse; 
} 
/** 
* @category 上传附件 
* @param strUrl 
* @param strFiles 
* @return 返回状态码 200 正常 
* @throws Exception 
*/ 
public String uploadFiles(String strUrl,String attachments) throws Exception 
{ 
   String strResponse = null; 
   HttpClient httpClient = new HttpClient(); 
   MultipartPostMethod postMethod = new MultipartPostMethod(strUrl.trim()); 
   try { 
    if (null != attachments && attachments.trim().length()>0) { 
     String [] strArr = attachments.trim().split("\\|"); 
     for (int i = 0; i < strArr.length; i++) { 
      if (null!= strArr[i] && strArr[i].trim().length()>0) { 
       String fileName = strArr[i].trim(); 
       fileName = fileName.replaceAll("\\\\", "/").replaceAll("//","/"); 
       fileName = fileName.replaceAll("\\\\", "/").replaceAll("//","/"); 
       String[] strTmpNameArr = fileName.split("/"); 
       if (strTmpNameArr.length>0) { 
        fileName = strTmpNameArr[strTmpNameArr.length-1]; 
        postMethod.addPart(new FilePart(fileName,new File(strArr[i].trim()))); 
       } 
      } 
     } 
    } 
    else { 
     return "File can not be null"; 
    } 
    httpClient.getParams().setContentCharset("UTF-8"); 
    int statusCode = httpClient.executeMethod(postMethod); 
    if (statusCode == 200) { 
     strResponse = postMethod.getResponseBodyAsString(); 
     
    } 
    return strResponse; 
   } catch (Exception e){ 
    throw e; 
   } 
   finally 
   { 
    postMethod.releaseConnection(); 
   } 
} 

public static void main(String[] args) { 
   HttpClientUtile testSendData = new HttpClientUtile(); 
   try { 
     String strUploadFile = testSendData.uploadFiles("http://172.16.22.61:8068/isite/uploadLog", "d://project.txt"); 
     System.out.println("strUploadFile:"+strUploadFile); 
   } catch (Exception e) { 
    e.printStackTrace(); 
   } 
} 
} 

用到的Jar包：commons-httpclient-3.0.1.jar、commons-logging-1.1.1.jar、commons-beanutils-1.8.0-BETA.jar和commons-codec.jar；这个网上很多，很容易就可以找到；

服务端接收的代码：

/*
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 * and open the template in the editor.
 */
package com.ithings.irtu.sync.controller;

import com.ithings.irtu.utils.SystemConstants;
import com.ithings.util.CommUtils;
import java.io.File;
import java.io.PrintWriter;
import java.util.Date;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;

/**
 *
 */
public class UploadLogServlet extends HttpServlet{ 
protected void doGet(HttpServletRequest req, HttpServletResponse resp) { 
   doPost(req, resp); 
} 

protected void doPost(HttpServletRequest req, HttpServletResponse resp) { 
   PrintWriter out = null;
   String flag = "0";
   File saveFile = null;
   try { 
        out = resp.getWriter(); 
        String fileName = req.getParameter("name");
        if(CommUtils.isNull(fileName)){
            fileName = "upgrade"  + CommUtils.convertDateToString(new Date(), "yyyy-MM-dd-HH-mm-ss")  + ".txt";
        }
        String filePath = SystemConstants.UPGRADE_LOG_FILE_PATH +  fileName;
        File dir = new File(SystemConstants.UPGRADE_LOG_FILE_PATH);
        if(!dir.exists()){
            dir.mkdirs();
        }
        DiskFileUpload diskFileUpload = new DiskFileUpload(); 
        ///设置可上传文件的最大尺寸 
        diskFileUpload.setSizeMax(20*1024*1024); 
        //设置缓冲区大小，这里是2kb 
        diskFileUpload.setSizeThreshold(2048); 
        //设置临时目录 
        diskFileUpload.setRepositoryPath(SystemConstants.UPGRADE_LOG_FILE_PATH); 
        //获取所有文件 
        List listFiles = diskFileUpload.parseRequest(req); 
        if (null != listFiles && listFiles.size() > 0) { 
         for (int i = 0; i < listFiles.size(); i++) { 
               FileItem fileItem = (FileItem)listFiles.get(i); 
                if (null != fileItem.getName()) { 
                    saveFile = new File(SystemConstants.UPGRADE_LOG_FILE_PATH,fileItem.getName()); 
                    fileItem.write(saveFile); 
                }else{
                    saveFile = new File(filePath); 
                    fileItem.write(saveFile); 
                } 
         } 
    } 
    if(saveFile != null && saveFile.length() == 0){
            flag = "1";
            saveFile.delete();
     }
   } catch (Exception e) { 
        Logger.getLogger(UploadLogServlet.class.getName()).log(Level.SEVERE, null, e);
        flag = "1";
   }finally{
       if(out != null){
            out.write(flag); 
            out.flush(); 
            out.close(); 
       }
   } 
} 

}

其中SystemConstants.UPGRADE_LOG_FILE_PATH表示文件存放目录，你们可以定义自己的位置；