Java模拟表单post提交，可支持图片上传详解编程语言

/** 
     * 模拟表单post 
     * 
     * @param textMap 文本域 
     * @param fileMap 文件 
     * 
     */ 
    public static String postForm(String urlStr, Map<String, String> textMap, Map<String, String> fileMap) throws IOException { 
        String res = ""; 
        HttpURLConnection conn = null; 
        InputStream inS = null; 
        OutputStream out = 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(); 
            if (conn instanceof HttpsURLConnection) { 
                ((HttpsURLConnection) conn).setSSLSocketFactory(sslSocketFactory); 
                ((HttpsURLConnection) conn).setHostnameVerifier(trustAnyHostnameVerifier); 
            } 
  
            conn.setConnectTimeout(19000); 
            conn.setReadTimeout(19000); 
            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); 
  
            out = new DataOutputStream(conn.getOutputStream()); 
            // text value 
            if (textMap != null) { 
                StringBuffer strBuf = new StringBuffer(); 
                Iterator iter = textMap.entrySet().iterator(); 
                while (iter.hasNext()) { 
                    Map.Entry entry = (Map.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()); 
            } 
  
            // file 
            if (fileMap != null) { 
                Iterator iter = fileMap.entrySet().iterator(); 
                while (iter.hasNext()) { 
                    Map.Entry entry = (Map.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 = new MimetypesFileTypeMap().getContentType(file); 
                    if (filename.endsWith(".png")) { 
                        contentType = "image/png"; 
                    } else if (filename.endsWith(".gif")) { 
                        contentType = "image/gif"; 
                    } else if (filename.endsWith(".jpg")) { 
                        contentType = "image/jpeg"; 
                    } 
                    if (contentType == null || contentType.equals("")) { 
                        contentType = "application/octet-stream"; 
                    } 
  
                    StringBuffer strBuf = new StringBuffer(); 
                    strBuf.append("/r/n").append("--").append(BOUNDARY).append("/r/n"); 
                    strBuf.append("Content-Disposition: form-data; name=/"" + inputName + "/"; filename=/"" + filename + "/"/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); 
                    } 
                } 
            } 
  
            byte[] endData = ("/r/n--" + BOUNDARY + "--/r/n").getBytes(); 
            out.write(endData); 
            out.flush(); 
  
            // 读取返回数据 
            StringBuffer strBuf = new StringBuffer(); 
            inS = conn.getInputStream(); 
            BufferedReader reader = new BufferedReader(new InputStreamReader(inS)); 
            String line = null; 
            while ((line = reader.readLine()) != null) { 
                strBuf.append(line).append("/n"); 
            } 
            res = strBuf.toString(); 
            reader.close(); 
            reader = null; 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } finally { 
            if (out != null) { 
                out.close(); 
            } 
            if (inS != null) { 
                inS.close(); 
            } 
            if (conn != null) { 
                conn.disconnect(); 
                conn = null; 
            } 
        } 
        return res; 
    }