urlConniton 文件上传

 

package com.

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;



public class HttpPostUploadUtil {


    /**

     * @param args

     */

    public static void main(String[] args) {
        String filepath = "E:\\ziliao\\0.jpg";
        String urlStr = "http://127.0.0.1:8080/minicms/up/up_result.jsp";
        Map<String, String> textMap = new HashMap<String, String>();
        textMap.put("name", "testname");
        Map<String, String> fileMap = new HashMap<String, String>();
        fileMap.put("userfile", filepath);
        String ret = formUpload(urlStr, textMap, fileMap,null);
        System.out.println(ret);
    }


    /**
     * 上传图片
     * @param urlStr
     * @param textMap
     * @param fileMap
     * @return
     */

    public static String formUpload(String urlStr, Map<String, String> textMap, Map<String, String> fileMap,String fileStr) {
        String res = "";
        HttpURLConnection conn = null;
        String BOUNDARY = "---------------------------123821742118716"; //boundary就是request头和上传文件内容的分隔符  
        try {
            URL url = new URL(urlStr);
            conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(30000);
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
            conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
            OutputStream out = new DataOutputStream(conn.getOutputStream());

            // text  
            if (textMap != null) {
                StringBuffer strBuf = new StringBuffer();
                Iterator<Map.Entry<String, String>> iter = textMap.entrySet().iterator();
                while (iter.hasNext()) {
                    Map.Entry<String, String> entry = iter.next();
                    String inputName = (String) entry.getKey();
                    String inputValue = (String) entry.getValue();
                    if (inputValue == null) {
                        continue;
                    }
                    strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");
                    strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"\r\n\r\n");
                    strBuf.append(inputValue);
                }
                out.write(strBuf.toString().getBytes());
            }

            if( fileStr != null){
                //String contentType = " text/plain";
                String contentType = "application/x-gzip";
                StringBuffer strBuf = new StringBuffer();
                strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");
                strBuf.append("Content-Disposition: form-data; name=\"" + "aaa" + "\"; filename=\"" + "a.txt.gz" + "\"\r\n");
                strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
                strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
                strBuf.append("Transfer-Encoding:chunked\r\n\r\n");
                strBuf.append("Content-Encoding:gzip\r\n\r\n");
                out.write(strBuf.toString().getBytes());
                out.write(fileStr.getBytes());
            }else // file  if (fileMap != null) {
                Iterator<Map.Entry<String, String>> iter = fileMap.entrySet().iterator();
                while (iter.hasNext()) {
                    Map.Entry<String, String> entry = iter.next();
                    String inputName = (String) entry.getKey();
                    String inputValue = (String) entry.getValue();
                    if (inputValue == null) {
                        continue;
                    }
                    /*File file = new File(inputValue);
                    String filename = file.getName();*/
                    String contentType = "application/x-gzip";
                    //String contentType = " text/plain";
                    StringBuffer strBuf = new StringBuffer();
                    strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");
                    strBuf.append("Content-Disposition: form-data; name=\"" + "aaa" + "\"; filename=\"" + "a.txt.gz" + "\"\r\n");
                    strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
                    out.write(strBuf.toString().getBytes());
                    /*DataInputStream in = new DataInputStream(new FileInputStream(file));
                    int bytes = 0;
                    byte[] bufferOut = new byte[1024];
                    while ((bytes = in.read(bufferOut)) != -1) {
                        out.write(bufferOut, 0, bytes);
                    }
                    in.close();*/
                }
            }
            byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
            out.write(endData);
            out.flush();
            out.close();

            // 读取返回数据  
            StringBuffer strBuf = new StringBuffer();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                strBuf.append(line).append("\n");
            }
            res = strBuf.toString();
            reader.close();
            reader = null;
        } catch (Exception e) {
            System.out.println("发送POST请求出错。" + urlStr);
            e.printStackTrace();
        } finally {
            if (conn != null) {
                conn.disconnect();
                conn = null;
            }
        }
        return res;
    }
}

 写这些代码的原因，

1，不需要依赖任何的库

2，在很多杂乱的项目里面，太多乱哄哄的依赖

3，简单，容易用，拿来就上手。