AsyncHttpClient, RequestParams ,AsyncHttpResponseHandler三個類使用方法

1. AsyncHttpClient, RequestParams ,AsyncHttpResponseHandler三個類使用方法

(1)AsyncHttpClient
public class AsyncHttpClient extends java.lang.Object
 該類一般用在android應用程序中建立異步GET, POST, PUT和DELETE HTTP請求，請求參數經過RequestParams實例建立，響應經過重寫匿名內部類 ResponseHandlerInterface的方法處理。
例子：

AsyncHttpClient client = new AsyncHttpClient();
 client.get("http://www.baidu.com", new ResponseHandlerInterface() {
     @Override
     public void onSuccess(String response) {
         System.out.println(response);
     }
 });

(2)RequestParams
public class RequestParams extends java.lang.Object 
用於建立AsyncHttpClient實例中的請求參數(包括字符串或者文件)的集合
例子：

RequestParams params = new RequestParams();
 params.put("username", "tom");
 params.put("password", "111111");
 params.put("email", "my@email.com");
 params.put("file", new File("test.txt")); // Upload a File
 
 Map<String, String> map = new HashMap<String, String>();
 map.put("first_name", "James");
 map.put("last_name", "Smith");
 params.put("user", map); // url params: "user[first_name]=James&user[last_name]=Smith"
 
 Set<String> set = new HashSet<String>(); // unordered collection
 set.add("music");
 set.add("art");
 params.put("like", set); // url params: "like=music&like=art"
 
 List<String> list = new ArrayList<String>(); // Ordered collection
 list.add("Java");
 list.add("C");
 params.put("languages", list); // url params: "languages[]=Java&languages[]=C"
 
 String[] colors = { "blue", "yellow" }; // Ordered collection
 params.put("colors", colors); // url params: "colors[]=blue&colors[]=yellow"
 
 List<Map<String, String>> listOfMaps = new ArrayList<Map<String, String>>();
 Map<String, String> user1 = new HashMap<String, String>();
 user1.put("age", "30");
 user1.put("gender", "male");
 Map<String, String> user2 = new HashMap<String, String>();
 user2.put("age", "25");
 user2.put("gender", "female");
 listOfMaps.add(user1);
 listOfMaps.add(user2);
 params.put("users", listOfMaps); // url params: "users[][age]=30&users[][gender]=male&users[][age]=25&users[][gender]=female"
 
 AsyncHttpClient client = new AsyncHttpClient();
 client.post("http://myendpoint.com", params, responseHandler);

(3)public class AsyncHttpResponseHandler extends java.lang.Object implements ResponseHandlerInterface
用於攔截和處理由AsyncHttpClient建立的請求。在匿名類AsyncHttpResponseHandler中的重寫 onSuccess(int, org.apache.http.Header[], byte[])方法用於處理響應成功的請求。此外，你也能夠重寫 onFailure(int, org.apache.http.Header[], byte[], Throwable), onStart(), onFinish(), onRetry() 和onProgress(int, int)方法
例子：

AsyncHttpClient client = new AsyncHttpClient();
 client.get("http://www.google.com", new AsyncHttpResponseHandler() {
     @Override
     public void onStart() {
         // Initiated the request
     }
 
     @Override
     public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
         // Successfully got a response
     }
 
     @Override
     public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error)
 {
         // Response failed :(
     }
 
     @Override
     public void onRetry() {
         // Request was retried
     }
 
     @Override
     public void onProgress(int bytesWritten, int totalSize) {
         // Progress notification
     }
 
     @Override
     public void onFinish() {
         // Completed the request (either success or failure)
     }
 });

2.利用RequestParams上傳文件
類RequestParams支持multipart file 文件上傳

(1)添加文件對象用於上傳

File myFile = new File("/path/to/file.png");
RequestParams params = new RequestParams();
try {
    params.put("profile_picture", myFile);
} catch(FileNotFoundException e) {}

(2)添加字節數組用於上傳（字節轉化見上一片）

byte[] myByteArray = bytes;
RequestParams params = new RequestParams();
params.put("file", new ByteArrayInputStream(myByteArray), "text.txt");

轉載自：http://my.oschina.net/u/1471093/blog/341811