Android_HttpClient_get请求post表单提交上传

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http://blog.csdn.net/zimo2013/article/details/12193427

关于HttpUrlConnection用法

1.HttpRequestBase(HttpGet..)

HttpClient 支持多种访问网络的方式，包括GET, HEAD, POST, PUT, DELETE, TRACE and OPTIONS. 其对应子类为HttpGet, HttpHead, HttpPost, HttpPut, HttpDelete, HttpTrace, and HttpOptions.但在使用时多为HttpGet, HttpPost两种方式。

/** * 一个简单的get请求 */private static void get() {// 1.得到HttpClient对象HttpClient httpClient = new DefaultHttpClient();// 2.实例化一个HttpGet对象HttpGet httpGet = new HttpGet("http://www.baidu.com");try {// 3.httpClient执行httpGet请求HttpResponse response = httpClient.execute(httpGet);HttpEntity entity = response.getEntity();if (entity != null) { // 如果有数据表示请求成功System.out.println(EntityUtils.toString(entity, "utf-8"));} else {System.out.println("连接失败！");}} catch (Exception e) {e.printStackTrace();} finally {// 4.释放资源(Shuts down this connection manager and releases allocated// resources)httpClient.getConnectionManager().shutdown();}}

2.HttpResponse

通过得到HttpResponse对象，可以得到相关访问网络的信息，比如getEntity() getStatusLine()等等

System.out.println(response.getProtocolVersion());System.out.println(response.getStatusLine().getStatusCode());System.out.println(response.getStatusLine().getReasonPhrase());System.out.println(response.getStatusLine().toString());

输出结果为

/*HTTP/1.1200OKHTTP/1.1 200 OK*/

//得到请求的响应数据//方式一.HttpEntity entity = response.getEntity();if (entity != null) { // 如果有数据表示请求成功System.out.println(EntityUtils.toString(entity, "utf-8"));} else {System.out.println("连接失败！");}//方式二.if(response.getStatusLine().getStatusCode() == 200){HttpEntity myEntity = response.getEntity();BufferedInputStream in = new BufferedInputStream(myEntity.getContent());byte[] bytes = read(in);//通过自定义的read方法，取得该输入流对应的数据}

3.ResponseHandler

/** * 通过ResponseHandler处理请求 */private static void test() {HttpClient httpClient = new DefaultHttpClient();HttpGet httpGet = new HttpGet("http://www.baidu.com");//自定义ResponseHandler对象ResponseHandler<String> myHandler = new ResponseHandler<String>() {@Overridepublic String handleResponse(HttpResponse response)throws ClientProtocolException, IOException {HttpEntity entity = response.getEntity();String result = "连接失败！";if (entity != null) { // 如果有数据表示请求成功result = EntityUtils.toString(entity, "utf-8");}return result;}};try {String result = httpClient.execute(httpGet, myHandler);//接收该myHandler对象System.out.println(result);} catch (Exception e) {e.printStackTrace();} finally {// 释放资源(Shuts down this connection manager and releases allocated resources)httpClient.getConnectionManager().shutdown();}}

4.连接超时设置

HttpClient client = new DefaultHttpClient();//客户端的设置client.getParams().setParameter(HttpConnectionParams.CONNECTION_TIMEOUT, 1000);HttpGet get = new HttpGet("http://www.baidu.com");//如果当前的请求设置了，以当前为准，否则为client参数为准//连接超时get.getParams().setParameter(HttpConnectionParams.CONNECTION_TIMEOUT, 5000);//读取超时get.getParams().setParameter(HttpConnectionParams.SO_TIMEOUT, 1000, 5000);

5.GZIP压缩

对于文本数据，特别是json数据或者html网页数据，最好使用gzip进行压缩，理论上文本数据可以压缩为原来的1/3，效果很明显，压缩之后应该使用gzip流进行解压缩！

get.addHeader("Accept-Encoding", "gzip");//使用addHeader，否则没有效果HttpResponse response = client.execute(get);int code = response.getStatusLine().getStatusCode();Header header = response.getFirstHeader("Content-Encoding");InputStream is = new BufferedInputStream(response.getEntity().getContent());if (header != null && header.getValue().contains("gzip")) {//首先判断服务器是否支持gzip压缩 is = new GZIPInputStream(is);}

6.Post完成Form表单的提交

/** * 完成form表单的提交 */private static void post() {HttpClient httpClient = new DefaultHttpClient();HttpPost httpPost = new HttpPost("http://127.0.0.1:8080/My/upload");try {// 为httpPost设置HttpEntity对象List<NameValuePair> parameters = new ArrayList<NameValuePair>();parameters.add(new BasicNameValuePair("username", "zhangsan"));parameters.add(new BasicNameValuePair("password", "123321"));HttpEntity entity = new UrlEncodedFormEntity(parameters);httpPost.setEntity(entity);// httpClient执行httpPost表单提交HttpResponse response = httpClient.execute(httpPost);// 得到服务器响应实体对象HttpEntity responseEntity = response.getEntity();if (responseEntity != null) {System.out.println(EntityUtils.toString(responseEntity, "utf-8"));System.out.println("表单上传成功！");} else {System.out.println("服务器无响应！");}} catch (Exception e) {e.printStackTrace();} finally {// 释放资源httpClient.getConnectionManager().shutdown();}}

7.Post完成文件的长传

/** * 通过post完成文件的上传 */private static void postFile() {HttpClient httpClient = new DefaultHttpClient();HttpPost httpPost = new HttpPost("http://127.0.0.1:8080/My/upload");try {// 需要上传的文件String root = "D:/api/";String fileName = "JDK6.0 中文文档.CHM";File uploadFile = new File(root+fileName);//定义FileEntity对象HttpEntity entity = new FileEntity(uploadFile);//为httpPost设置头信息httpPost.setHeader("filename", URLEncoder.encode(fileName,"utf-8"));//服务器可以读取到该文件名httpPost.setHeader("Content-Length", String.valueOf(entity.getContentLength()));//设置传输长度httpPost.setEntity(entity);//设置实体对象// httpClient执行httpPost提交HttpResponse response = httpClient.execute(httpPost);// 得到服务器响应实体对象HttpEntity responseEntity = response.getEntity();if (responseEntity != null) {System.out.println(EntityUtils.toString(responseEntity, "utf-8"));System.out.println("文件 "+fileName+"上传成功！");} else {System.out.println("服务器无响应！");}} catch (Exception e) {e.printStackTrace();} finally {// 释放资源httpClient.getConnectionManager().shutdown();}}