Target host is null、java.net.URISyntaxException的解决办法

java.net.URISyntaxException的解决办法

近日在用HttpClient访问抓取汇率时，为了省力，直接采用

String url = "http://api.liqwei.com/currency/?exchange=usd|cny&count=1";
HttpClient client    = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);
HttpResponse response = client.execute(httpget);

 

以前用这种方法都没有问题，但这次却报如下错误：

java.net.URISyntaxException: Illegal character in query at index 44

 

查找了一些网上资料，说地址中涉及了特殊字符，如‘｜’‘&’等。所以不能直接用String代替URI来访问。必须采用%0xXX方式来替代特殊字符。但这种办法不直观。所以只能先把String转成URL，再能过URL生成URI的方法来解决问题。代码如下

URL url = new URL(strUrl);
URI uri = new URI(url.getProtocol(), url.getHost(), url.getPath(), url.getQuery(), null);
HttpClient client    = new DefaultHttpClient();
HttpGet httpget = new HttpGet(uri);

转载自：http://qsfwy.iteye.com/blog/1926302