服务器访问服务器读xml文件,请高手请教

Question

URL 类没有import ,-----java.net.URL

Answer 1

谢谢你
不过还有些问题
就是
<%@ page import="java.sql.*"%>
<%@ page contentType="text/html;charset=GB2312"%>
<%@ page language="java"%>  
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="org.jdom.*"%>
<%@ page import="java.net.URL"%>
<%@ page import="org.jdom.output.*"%>
<%@ page import="org.jdom.input.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
SAXBuilder builder = new SAXBuilder(); 
   String condition_df = "http://61.142.251.10/anluo/[email protected]&yewu=1984921121";
   URL url_df = new URL(condition_df); 
   String urlconn_df = url_df.openConnection(); 
   DataInputStream dis_df = new DataInputStream(urlconn_df.getInputStream()); 
    Document doc_df = builder.build(dis_df); 
    Element custinfo = doc_df.getRootElement(); 
                String ID1=custinfo.getChild("account").getText();
                String ID2=custinfo.getChild("yewue").getText();
                String ID3=custinfo.getChild("cert").getText();
                String ID4=custinfo.getChild("name").getText();
                String ID5=custinfo.getChild("tel").getText();org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 16 in the jsp file: /xul5.jspGenerated servlet error:
    [javac] Compiling 1 source fileC:\JBuilderX\thirdparty\jakarta-tomcat-4.1.27-LE-jdk14\work\Standalone\localhost\_\xul5_jsp.java:72: incompatible types
found   : java.net.URLConnection
required: java.lang.String
   String urlconn_df = url_df.openConnection(); 
                                            ^An error occurred at line: 16 in the jsp file: /xul5.jspGenerated servlet error:
C:\JBuilderX\thirdparty\jakarta-tomcat-4.1.27-LE-jdk14\work\Standalone\localhost\_\xul5_jsp.java:73: cannot resolve symbol
symbol  : method getInputStream ()
location: class java.lang.String
   DataInputStream dis_df = new DataInputStream(urlconn_df.getInputStream()); 
                                                          ^
2 errors
那个错了
String urlconn_df = url_df.openConnection(); 
不是字符行的
应该是那种类型啊
urlconn_df = url_df.openConnection(); 

Answer 2

url_df.openConnection(); 这个是返回java.net.URLConnection并不是string，你后面的urlconn_df.getInputStream()，如果是string哪能得到输入流。楼主是用文本编辑的吧，如果是用IDE那就有很多报错了。如果想清楚那个函数是返回什么，建议楼主去sun下载一个jdk的帮助文档

Answer 3

我改成那样
Object urlconn_df = url_df.openConnection(); 
   DataInputStream dis_df = new DataInputStream(urlconn_df.getInputStream()); 
    Document doc_df = builder.build(dis_df); 
错误是
C:\JBuilderX\thirdparty\jakarta-tomcat-4.1.27-LE-jdk14\work\Standalone\localhost\_\xul5_jsp.java:73: cannot resolve symbol
symbol  : method getInputStream ()
location: class java.lang.Object
   DataInputStream dis_df = new DataInputStream(urlconn_df.getInputStream()); 
                                                          ^
1 error