在eclipse中写了这六行代码:       
HttpClient client = new HttpClient();
HttpMethod method = new GetMethod("http://java.sun.com");
client.executeMethod(method);
System.out.println(method.getStatusLine());
System.out.println(method.getResponseBodyAsString());
method.releaseConnection();
就报了如下的错误:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/codec/DecoderException
at org.apache.commons.httpclient.HttpMethodBase.<init>(Unknown Source)
at org.apache.commons.httpclient.methods.GetMethod.<init>(Unknown Source)
at com.unisure.struts.common.HttpClientTest.main(HttpClientTest.java:18)
郁闷!搞了好久,还不知怎处理,肯求高手指点