android 实现http请求

最新推荐文章于 2021-10-21 15:39:20 发布

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#android #string #exception #null #url #servlet

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本文提供了使用Java实现HTTP GET和POST请求的具体示例，包括如何通过HttpClient和HttpURLConnection发送带参数的GET请求及POST请求，并展示了如何读取响应结果。

一、HttpClinet方式

1、HTTP GET 示例:

public class TestHttpGetMethod{ public void get(){ BufferedReader in = null; try{ HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(); request.setURI("http://w26.javaeye.com"); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while((line = in.readLine()) != null){ sb.append(line + NL); } in.close(); String page = sb.toString(); Log.i(TAG, page); }catch(Exception e){ Log.e(TAG,e.toString()) }finally{ if(in != null){ try{ in.close(); }catch(IOException ioe){ Log.e(TAG, ioe.toString()); } } } } }

带参数的 HTTP GET:
HttpGet request = new HttpGet("http://www.baidu.com/s?wd=amos_tl"); client.execute(request);

2、HTTP POST 示例:

public class TestHttpPostMethod{ public void post(){ BufferedReader in = null; try{ HttpClient client = new DefaultHttpClient(); HttpPost request = new HttpPost("http://localhost/upload.jsp"); List<NameValuePair> postParams = new ArrayList<NameValuePair>(); postParams.add(new BasicNameValuePair("filename", "sex.mov")); UrlEncodeFormEntity formEntity = new UrlEncodeFormEntity(postParams); request.setEntity(formEntity); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while((line = in.readLine()) != null){ sb.append(line + NL); } in.close(); String result = sb.toString(); Log.i(TAG, result ); }catch(Exception e){ Log.e(TAG,e.toString()) }finally{ if(in != null){ try{ in.close(); }catch(IOException ioe){ Log.e(TAG, ioe.toString()); } } } } }

二、HttpURLConnection 方式

URL url = null; HttpURLConnection conn = null; InputStream in = null; OutputStream out = null; byte[] data ="测试字符串".getBytes(); try{ url =new URL("www.xxx.com/servlet"); conn = (HttpURLConnection) url.openConnection(); //设置连接属性 conn.setDoOutput(true);// 使用 URL 连接进行输出 conn.setDoInput(true);// 使用 URL 连接进行输入 conn.setUseCaches(false);// 忽略缓存 conn.setConnectTimeout(30000);//设置连接超时时长，单位毫秒 conn.setRequestMethod("POST");//设置请求方式，POST or GET，注意：如果请求地址为一个servlet地址的话必须设置成POST方式 //设置请求头 conn.setRequestProperty("Accept", "*/*"); conn.setRequestProperty("Connection", "Keep-Alive"); conn.setRequestProperty("Accept-Charset", "utf-8"); if (data != null) { out = conn.getOutputStream(); out.write(data); } int code = conn.getResponseCode(); if(code ==200){ in = conn.getInputStream();// 可能造成阻塞 long len = conn.getContentLength(); byte[] bs = new byte[(int) len];//返回结果字节数组 int all = 0; int dn = 0; while ((dn = in.read(bs, all, 1)) > 0) { all += dn; if (all == len) { break; } } } }