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apache的包，用着很爽。厚实的基础库。 // HttpClient get请求DefaultHttpClient client = new DefaultHttpClient();HttpGet get = new HttpGet("http://192.168.1.29:8080/itheima83/servlet/LoginServlet?username=abcdef&pwd=123456");BasicHttpResponse response = (BasicHttpResponse) client.execute(get);int status = response.getStatusLine().getStatusCode();if(status == 200){ InputStream is = response.getEntity().getContent(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024*10]; int len =0; while((len = is.read(buffer)) != -1){ bos.write(buffer,0,len); } message = bos.toString(); bos.close(); is.close();} // HttpClient post请求 DefaultHttpClient client = new DefaultHttpClient();//HttpGet get = new HttpGet("http://192.168.1.29:8080/itheima83/servlet/LoginServlet?username=abcdef&pwd=123456");HttpPost post = new HttpPost("http://192.168.1.29:8080/itheima83/servlet/LoginServlet");//设置请求体List list = new ArrayList ();BasicNameValuePair value1 = new BasicNameValuePair("username","abcdef");BasicNameValuePair value2 = new BasicNameValuePair("pwd","123456");list.add(value1);list.add(value2);UrlEncodedFormEntity myentity;myentity = new UrlEncodedFormEntity(list);post.setEntity(myentity);BasicHttpResponse response = (BasicHttpResponse) client.execute(post);int status = response.getStatusLine().getStatusCode();if(status == 200){ InputStream is = response.getEntity().getContent(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024*10]; int len =0; while((len = is.read(buffer)) != -1){ bos.write(buffer,0,len); } message = bos.toString(); bos.close(); is.close();} // post 文件上传（这个库，下载容易，上传难。因为请求体的封装类好像没有） //android 自带的 apche库。没有最新的上传请求体包装类。 MultipartEntity ; 需要加入新版本的HttpClient的库jar,才能使用组件上传 // 各个版本，支持上传的类相当不同. 在jar 库里有。android 自带的。 测试 HttpClient4.1.3，不需要依赖库。最新到4.5.1。 HttpPost post = new HttpPost("http://192.168.1.29:8080/mytry/Upload");File file = new File("/data/data/com.hunty.upanddown/files/wo.java");//可以加入多个 FileBodyFileBody body = new FileBody(file);MultipartEntity myentity = new MultipartEntity();myentity.addPart("zhangjianqiu.png", body);post.setEntity(myentity); // post 下载 InputStream is = response.getEntity().getContent();FileOutputStream bos = new FileOutputStream("/data/data/com.hunty.upanddown/files/zhangjianqiu.png");byte[] buffer = new byte[1024*10];int len =0;while((len = is.read(buffer)) != -1){ bos.write(buffer,0,len);}bos.close(); 获得的实体，转型封装成别的对象 FileEntity或者InputStreamEntity失败。 转载地址：http://wdegi.baihongyu.com/