java.net.URISyntaxException的解決辦法
近日在用HttpClient訪問抓取匯率時，爲了省力，直接採用
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);
以前用這種方法都沒有問題，但這次卻報如下錯誤：
java.net.URISyntaxException: Illegal character in query at index 44
查找了一些網上資料，說地址中涉及了特殊字符，如‘｜’‘&’等。所以不能直接用String代替URI來訪問。必須採用%0xXX方式來替代特殊字符。但這種辦法不直觀。所以只能先把String轉成URL，再能過URL生成URI的方法來解決問題。代碼如下
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);