httpClient

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httpClient

在http请求失败是要进行下列操作：

if (response.getStatusLine ().getStatusCode () != 200) {  get.abort(); return null; }

HttpGet操作：

public final static void main(String[] args) throws Exception {HttpClient httpclient = new DefaultHttpClient();try {HttpGet httpget = new HttpGet("/");System.out.println("executing request " + httpget.getURI());HttpResponse response = httpclient.execute(httpget);HttpEntity entity = response.getEntity();System.out.println("----------------------------------------");System.out.println(response.getStatusLine());if (entity != null) {System.out.println("Response content length: " + entity.getContentLength());}System.out.println("----------------------------------------");InputStream inSm = entity.getContent();Scanner inScn = new Scanner(inSm);while (inScn.hasNextLine()) {System.out.println(inScn.nextLine());}// Do not feel like reading the response body// Call abort on the request objecthttpget.abort();} finally {// When HttpClient instance is no longer needed,// shut down the connection manager to ensure// immediate deallocation of all system resourceshttpclient.getConnectionManager().shutdown();}}

读取response响应内容部分，也可以借助于 httpcore-4.1.2.jar 里面的：

public class Demo1 {/*** 用 get 方法访问 www.apache.org 并返回内容** @param args*/public static void main(String[] args) {//创建默认的 HttpClient 实例HttpClient httpClient = new DefaultHttpClient();try {//创建 httpUriRequest 实例HttpGet httpGet = new HttpGet("/");System.out.println("uri=" + httpGet.getURI());//执行 get 请求HttpResponse httpResponse = httpClient.execute(httpGet);//获取响应实体HttpEntity httpEntity = httpResponse.getEntity();//打印响应状态System.out.println(httpResponse.getStatusLine());if (httpEntity != null) {//响应内容的长度long length = httpEntity.getContentLength();//响应内容String content = EntityUtils.toString(httpEntity);System.out.println("Response content length:" + length);System.out.println("Response content:" + content);}//有些教程里没有下面这行httpGet.abort();} catch (Exception e) {e.printStackTrace();} finally {//关闭连接，释放资源httpClient.getConnectionManager().shutdown();}}
}

分析请求包中这六个头信息： httpget.setHeader("Accept-Encoding", "gzip, deflate")可能产生乱码

/*** @param args* @throws IOException*/public static void main(String[] args) {HttpClient httpClient = new DefaultHttpClient();try {HttpGet httpget = new HttpGet("");httpget.setHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");httpget.setHeader("Accept-Language", "zh-cn,zh;q=0.5");httpget.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1)");httpget.setHeader("Accept-Encoding", "gzip, deflate");httpget.setHeader("Accept-Charset", "GB2312,utf-8;q=0.7,*;q=0.7");httpget.setHeader("Host", "www.iteye.com");httpget.setHeader("Connection", "Keep-Alive");HttpResponse response = httpClient.execute(httpget);HttpEntity entity = response.getEntity();System.out.println("----------------------------------------");System.out.println(response.getStatusLine());if (entity != null) {System.out.println("Response content length: " + entity.getContentLength());}System.out.println("----------------------------------------");InputStream inSm = entity.getContent();Scanner inScn = new Scanner(inSm);while (inScn.hasNextLine()) {System.out.println(inScn.nextLine());}// Do not feel like reading the response body// Call abort on the request objecthttpget.abort();} catch (Exception e) {e.printStackTrace();} finally {// When HttpClient instance is no longer needed,// shut down the connection manager to ensure// immediate deallocation of all system resourceshttpClient.getConnectionManager().shutdown();}}

HttpPost操作：

public class Demo2 {/*** 用post方法访问本地应用根据传递参数不同，返回不同结果** @param args*/public static void main(String[] args) {//创建默认的 HttpClient 实例HttpClient httpClient = new DefaultHttpClient();HttpPost httpPost = new HttpPost("http://localhost:86/test1Servlet");List<NameValuePair> formParams = new ArrayList<NameValuePair>();formParams.add(new BasicNameValuePair("param1", "***"));UrlEncodedFormEntity urlEncodedFormEntity;try {urlEncodedFormEntity = new UrlEncodedFormEntity(formParams, "UTF-8");httpPost.setEntity(urlEncodedFormEntity);System.out.println("execurting request:" + httpPost.getURI());HttpResponse httpResponse = null;httpResponse = httpClient.execute(httpPost);HttpEntity httpEntity = httpResponse.getEntity();if (httpEntity != null) {String content = EntityUtils.toString(httpEntity, "UTF-8");System.out.println("Response content:" + content);}} catch (ClientProtocolException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {//关闭连接，释放资源httpClient.getConnectionManager().shutdown();}}
}

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本文标签： httpclient