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J2ME通過URL訪問XML文件並下載XML到本地
（葉全府）J2ME通過URL訪問XML文件並下載XML到本地
2009-06-11 14:45
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* 網絡連接 * 固定URL的網絡連接 * @param cmnet * true走cmnet false走cmwap * @return返回String類型的XML數據 */ private String connect(boolean cmnet) { try { if (cmnet) { http = (HttpConnection) Connector .open(https://xx.cn/t.xml); } else { http = (HttpConnection) Connector .open(https://10.0.0.3/t.xml); http.setRequestProperty("X-Online-Host", "xx.cn"); } http.setRequestProperty("Content-Type", "application/octet-stream"); http.setRequestProperty("Connection", "Keep-Alive"); http.setRequestMethod(HttpConnection.GET); // 判斷是否為連接網絡收費提示頁麵 String content_type = http.getHeaderField("Content-Type"); // 如果是返回移動的攔截頁麵，則重發． if (content_type.indexOf("wml") != -1) { try { http.close(); } catch (IOException e) { } http = null; // 重新發起一次請求 if (cmnet) { http = (HttpConnection) Connector .open(https://xx.cn/t.xml); } else { http = (HttpConnection) Connector .open(https://10.0.0.3/t.xml); http.setRequestProperty("X-Online-Host", "xx.cn"); } http.setRequestMethod(HttpConnection.GET); } int code = http.getResponseCode(); if (code == 200) {// 返回200 表示連接成功 // 打開輸入流，讀取數據 InputStreamReader is = new InputStreamReader(http .openInputStream(), "UTF-8"); // 建一StringBuffer，用於保存已讀的數據 StringBuffer sb = new StringBuffer(); // 每次讀取1K的數據 char[] c = new char[1024]; int k; // 循環讀取數據，直到讀完 當返回-1時表示流已讀完 while ((k = is.read(c)) != -1) { sb.append(c, 0, k); } is.close(); is = null; http.close(); http = null; return sb.toString(); } } catch (Exception e) { e.printStackTrace(); // return null; } finally { if (http != null) { try { http.close(); http = null; } catch (IOException e) { } http = null; } } return null; } |
最後更新：2017-04-02 06:51:20