在httpclient4.x中没有commons-httpclient-3.0.jar,无法使用import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.NameValuePair; import org.apache.commons.httpclient.methods.PostMethod;其他两个必须的包commons-codec-1.4.jar和commons-logging-1.1.1.jar很容易找到