Android post请求

以下源代码，都是从开源中国app摘取。有借鉴之用。

/**
	 * 公用post方法
	 * @param url
	 * @param params
	 * @param files
	 * @throws AppException
	 */
	private static InputStream _post(AppContext appContext, String url, Map<String, Object> params, Map<String,File> files) throws AppException {
		//System.out.println("post_url==> "+url);
		String cookie = getCookie(appContext);
		String userAgent = getUserAgent(appContext);
		
		HttpClient httpClient = null;
		PostMethod httpPost = null;
		
		//post表单参数处理
		int length = (params == null ? 0 : params.size()) + (files == null ? 0 : files.size());
		Part[] parts = new Part[length];
		int i = 0;
        if(params != null)
        for(String name : params.keySet()){
        	parts[i++] = new StringPart(name, String.valueOf(params.get(name)), UTF_8);
        	//System.out.println("post_key==> "+name+"    value==>"+String.valueOf(params.get(name)));
        }
        if(files != null)
        for(String file : files.keySet()){
        	try {
				parts[i++] = new FilePart(file, files.get(file));
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
        	//System.out.println("post_key_file==> "+file);
        }
		
		String responseBody = "";
		int time = 0;
		do{
			try 
			{
				httpClient = getHttpClient();
				httpPost = getHttpPost(url, cookie, userAgent);	        
		        httpPost.setRequestEntity(new MultipartRequestEntity(parts,httpPost.getParams()));		        
		        int statusCode = httpClient.executeMethod(httpPost);
		        if(statusCode != HttpStatus.SC_OK) 
		        {
		        	throw AppException.http(statusCode);
		        }
		        else if(statusCode == HttpStatus.SC_OK) 
		        {
		            Cookie[] cookies = httpClient.getState().getCookies();
		            String tmpcookies = "";
		            for (Cookie ck : cookies) {
		                tmpcookies += ck.toString()+";";
		            }
		            //保存cookie   
	        		if(appContext != null && tmpcookies != ""){
	        			appContext.setProperty("cookie", tmpcookies);
	        			appCookie = tmpcookies;
	        		}
		        }
		     	responseBody = httpPost.getResponseBodyAsString();
		        //System.out.println("XMLDATA=====>"+responseBody);
		     	break;	     	
			} catch (HttpException e) {
				time++;
				if(time < RETRY_TIME) {
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e1) {} 
					continue;
				}
				// 发生致命的异常，可能是协议不对或者返回的内容有问题
				e.printStackTrace();
				throw AppException.http(e);
			} catch (IOException e) {
				time++;
				if(time < RETRY_TIME) {
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e1) {} 
					continue;
				}
				// 发生网络异常
				e.printStackTrace();
				throw AppException.network(e);
			} finally {
				// 释放连接
				httpPost.releaseConnection();
				httpClient = null;
			}
		}while(time < RETRY_TIME);
        
        responseBody = responseBody.replaceAll("\\p{Cntrl}", "");
		if(responseBody.contains("result") && responseBody.contains("errorCode") && appContext.containsProperty("user.uid")){
			try {
				Result res = Result.parse(new ByteArrayInputStream(responseBody.getBytes()));	
				if(res.getErrorCode() == 0){
					appContext.Logout();
					appContext.getUnLoginHandler().sendEmptyMessage(1);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}			
		}
        return new ByteArrayInputStream(responseBody.getBytes());
	}

从配置文件获取cookie

	
	private static String getCookie(AppContext appContext) {
		if(appCookie == null || appCookie == "") {
			appCookie = appContext.getProperty("cookie");
		}
		return appCookie;
	}

得到用户信息统计

	
	private static String getUserAgent(AppContext appContext) {
		if(appUserAgent == null || appUserAgent == "") {
			StringBuilder ua = new StringBuilder("OSChina.NET");
			ua.append('/'+appContext.getPackageInfo().versionName+'_'+appContext.getPackageInfo().versionCode);//App版本
			ua.append("/Android");//手机系统平台
			ua.append("/"+android.os.Build.VERSION.RELEASE);//手机系统版本
			ua.append("/"+android.os.Build.MODEL); //手机型号
			ua.append("/"+appContext.getAppId());//客户端唯一标识
			appUserAgent = ua.toString();
		}
		return appUserAgent;
	}

请求代理参数

	
	private static HttpClient getHttpClient() {        
        HttpClient httpClient = new HttpClient();
		// 设置 HttpClient 接收 Cookie,用与浏览器一样的策略
		httpClient.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);
        // 设置 默认的超时重试处理策略
		httpClient.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
		// 设置 连接超时时间
		httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(TIMEOUT_CONNECTION);
		// 设置 读数据超时时间 
		httpClient.getHttpConnectionManager().getParams().setSoTimeout(TIMEOUT_SOCKET);
		// 设置 字符集
		httpClient.getParams().setContentCharset(UTF_8);
		return httpClient;
	}

设置请求方法参数

	
	private static PostMethod getHttpPost(String url, String cookie, String userAgent) {
		PostMethod httpPost = new PostMethod(url);
		// 设置 请求超时时间
		httpPost.getParams().setSoTimeout(TIMEOUT_SOCKET);
		httpPost.setRequestHeader("Host", URLs.HOST);
		httpPost.setRequestHeader("Connection","Keep-Alive");
		httpPost.setRequestHeader("Cookie", cookie);
		httpPost.setRequestHeader("User-Agent", userAgent);
		return httpPost;
	}

errorcode==0

	/**
	 * 未登录或修改密码后的处理
	 */
	public Handler getUnLoginHandler() {
		return this.unLoginHandler;
	}

<span style="white-space:pre">	</span>private Handler unLoginHandler = new Handler(){
<span style="white-space:pre">		</span>public void handleMessage(Message msg) {
<span style="white-space:pre">			</span>if(msg.what == 1){
<span style="white-space:pre">				</span>UIHelper.ToastMessage(AppContext.this, getString(R.string.msg_login_error));
<span style="white-space:pre">				</span>UIHelper.showLoginDialog(AppContext.this);
<span style="white-space:pre">			</span>}
<span style="white-space:pre">		</span>}<span style="white-space:pre">		</span>
<span style="white-space:pre">	</span>};