ajax跨域请求

1、httpclient代理处理跨域请求。

1.1、请求服务器的xml

（1）服务器端

CloseableHttpClient httpClient = HttpClients.createDefault();
		HttpGet httpGet = new HttpGet("http://fanyi.youdao.com/openapi.do?keyfrom=<keyfrom>&key=<key>&type=data&doctype=xml&version=1.1&q="+request.getParameter("q"));
		try {
			CloseableHttpResponse httpResponse = httpClient.execute(httpGet);
			HttpEntity entity = httpResponse.getEntity();
			if(entity !=null){
				String tmp = EntityUtils.toString(entity);
				httpResponse.close();
				response.setContentType("text/xml;charset=utf-8");
				PrintWriter out = response.getWriter();
				out.print(tmp);
				out.flush();
				out.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println(e.getMessage());
		}finally{
		}

　（2）客户端

$.ajax({
					type:"get",
					url:"/Ajax/fanyi.do",
					data:"q=good",
					success:function(xml){
						var data = "";
						data += $(xml).find("query").text();
						data += $(xml).find("translation").text();
						data += $(xml).find("basic").text();
						$("#status").text(data);
					}
				});

1.2 请求服务器的json格式

(1)服务器端

CloseableHttpClient httpClient = HttpClients.createDefault();
		HttpGet httpGet = new HttpGet("http://fanyi.youdao.com/openapi.do?keyfrom=<keyfrom>&key=<key>&type=data&doctype=json&version=1.1&q="+request.getParameter("q"));
		try {
			CloseableHttpResponse httpResponse = httpClient.execute(httpGet);
			HttpEntity entity = httpResponse.getEntity();
			if(entity !=null){
				String tmp = EntityUtils.toString(entity);
				httpResponse.close();
				response.setContentType("application/json;charset=utf-8");
				PrintWriter out = response.getWriter();
				out.print(tmp);
				out.flush();
				out.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println(e.getMessage());
		}finally{
		}

（2）客户端

$.ajax({
					type:"get",
					url:"/Ajax/fanyi.do",
					data:"q=good",
					success:function(data){
						$("#status").text(data.translation);
					}
				});