J2ME通过URL访问XML文件并下载XML到本地

（叶全府）J2ME通过URL访问XML文件并下载XML到本地

2009-06-11 14:45

** * 网络连接 * 固定URL的网络连接 * @param cmnet * true走cmnet false走cmwap * @return返回String类型的XML数据 */ private String connect( boolean cmnet) { try { if (cmnet) { http = (HttpConnection) Connector .open( http://xx.cn/t.xml ); } else { http = (HttpConnection) Connector .open( http://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); // 判断是否为连接网络收费提示页面 String content_type = http.getHeaderField( " Content-Type " ); // 如果是返回移动的拦截页面，则重发． if (content_type.indexOf( " wml " ) != - 1 ) { try { http.close(); } catch (IOException e) { } http = null ; // 重新发起一次请求 if (cmnet) { http = (HttpConnection) Connector .open( http://xx.cn/t.xml ); } else { http = (HttpConnection) Connector .open( http://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 表示连接成功 // 打开输入流，读取数据 InputStreamReader is = new InputStreamReader(http .openInputStream(), " UTF-8 " ); // 建一StringBuffer，用于保存已读的数据 StringBuffer sb = new StringBuffer(); // 每次读取1K的数据 char [] c = new char [ 1024 ]; int k; // 循环读取数据，直到读完 当返回-1时表示流已读完 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 ; }