网上找的模拟POST提交上传图片类

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class SocketHttpRequester {
    
     /**
     * 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能:
     *   <FORM METHOD=POST ACTION="http://192.168.1.101:8083/upload/servlet/UploadServlet" enctype="multipart/form-data">
            <INPUT TYPE="text" NAME="name">
            <INPUT TYPE="text" NAME="id">
            <input type="file" name="imagefile"/>
            <input type="file" name="zip"/>
         </FORM>
     * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.iteye.cn或http://192.168.1.101:8083这样的路径测试)
     * @param params 请求参数 key为参数名,value为参数值
     * @param file 上传文件
     */
    public static boolean post(String path, Map<String, String> params, FormFile[] files) throws Exception{     
        final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线
        final String endline = "--" + BOUNDARY + "--\r\n";//数据结束标志
        
        int fileDataLength = 0;
        for(FormFile uploadFile : files){//得到文件类型数据的总长度
            StringBuilder fileExplain = new StringBuilder();
             fileExplain.append("--");
             fileExplain.append(BOUNDARY);
             fileExplain.append("\r\n");
             fileExplain.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
             fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
             fileExplain.append("\r\n");
             fileDataLength += fileExplain.length();
            if(uploadFile.getInStream()!=null){
                fileDataLength += uploadFile.getFile().length();
             }else{
                 fileDataLength += uploadFile.getData().length;
             }
        }
        StringBuilder textEntity = new StringBuilder();
        for (Map.Entry<String, String> entry : params.entrySet()) {//构造文本类型参数的实体数据
            textEntity.append("--");
            textEntity.append(BOUNDARY);
            textEntity.append("\r\n");
            textEntity.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n");
            textEntity.append(entry.getValue());
            textEntity.append("\r\n");
        }
        //计算传输给服务器的实体数据总长度
        int dataLength = textEntity.toString().getBytes().length + fileDataLength +  endline.getBytes().length;
        
        URL url = new URL(path);
        int port = url.getPort()==-1 ? 80 : url.getPort();
        Socket socket = new Socket(InetAddress.getByName(url.getHost()), port);           
        OutputStream outStream = socket.getOutputStream();
        //下面完成HTTP请求头的发送
        String requestmethod = "POST "+ url.getPath()+" HTTP/1.1\r\n";
        outStream.write(requestmethod.getBytes());
        String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n";
        outStream.write(accept.getBytes());
        String language = "Accept-Language: zh-CN\r\n";
        outStream.write(language.getBytes());
        String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ "\r\n";
        outStream.write(contenttype.getBytes());
        String contentlength = "Content-Length: "+ dataLength + "\r\n";
        outStream.write(contentlength.getBytes());
        String alive = "Connection: Keep-Alive\r\n";
        outStream.write(alive.getBytes());
        String host = "Host: "+ url.getHost() +":"+ port +"\r\n";
        outStream.write(host.getBytes());
        //写完HTTP请求头后根据HTTP协议再写一个回车换行
        outStream.write("\r\n".getBytes());
        //把所有文本类型的实体数据发送出来
        outStream.write(textEntity.toString().getBytes());           
        //把所有文件类型的实体数据发送出来
        for(FormFile uploadFile : files){
            StringBuilder fileEntity = new StringBuilder();
             fileEntity.append("--");
             fileEntity.append(BOUNDARY);
             fileEntity.append("\r\n");
             fileEntity.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
             fileEntity.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
             outStream.write(fileEntity.toString().getBytes());
             if(uploadFile.getInStream()!=null){
                 byte[] buffer = new byte[1024];
                 int len = 0;
                 while((len = uploadFile.getInStream().read(buffer, 0, 1024))!=-1){
                     outStream.write(buffer, 0, len);
                 }
                 uploadFile.getInStream().close();
             }else{
                 outStream.write(uploadFile.getData(), 0, uploadFile.getData().length);
             }
             outStream.write("\r\n".getBytes());
        }
        //下面发送数据结束标志，表示数据已经结束
        outStream.write(endline.getBytes());
        
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        if(reader.readLine().indexOf("200")==-1){//读取web服务器返回的数据，判断请求码是否为200，如果不是200，代表请求失败
            return false;
        }
        outStream.flush();
        outStream.close();
        reader.close();
        socket.close();
        return true;
    }
    
    /**
     * 提交数据到服务器
     * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)
     * @param params 请求参数 key为参数名,value为参数值
     * @param file 上传文件
     */
    public static boolean post(String path, Map<String, String> params, FormFile file) throws Exception{
       return post(path, params, new FormFile[]{file});
    }
    
    public static void main(String[] args) {
          File imageFile=new File("D:/m.jpg");
          String requestUrl = "http://192.168.0.29:8080/api/club/topicadd.do";
          //请求普通信息
          Map<String, String> params = new HashMap<String, String>();
          params.put("m", "save");
          params.put("Title", "Android上传文件至服务器");
          params.put("Content", "本实例实现每隔5秒上传一次，通过服务器端获取手机上传过来的文件信息并做相应处理；采用Android+Struts技术。");
          //上传文件
          FormFile formfile = new FormFile(imageFile.getName(), imageFile, "file", "application/octet-stream");
          try {
            SocketHttpRequester.post(requestUrl, params, formfile);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}