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package test;
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java点虐 .HttpURLConnection;
import java点虐 .URL;
public class HttpTest {
private String u;
private String encoding;
public static void main(String[] args) throws Exception {
HttpTest client = new HttpTest("", "UTF-8");
client.run();
}
public HttpTest(String u, String encoding) {
this.u = u;
this.encoding = encoding;
}
public void run() throws Exception {
URL url = new URL(u);// 根据链接（字符串格式），生成一个URL对象
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();// 打开URL
BufferedReader reader = new BufferedReader(new InputStreamReader(
urlConnection.getInputStream(), encoding));// 得到输入流，即获得了网页的内容
String line; // 读取输入流的数据，并显示
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
}
}
根据具体问题类型，进行步骤拆解／原因原理分析／内容拓展等。
具体步骤如下：／导致这种情况的原因主要是……
1．编写useSourceViewer 类的基本框架，该类仅包括无返回值的main ()方法，该方法从参数中获取URL，通过输入缓冲和输出缓冲将该URL 原码输出。
2．编写useSourceViewer 类，代码如下：
import java点虐 .*;
import java.io.*;
public class useSourceViewer
{
public static void main (String[] args)
{
if (args.length 0)
{
try
{
//读入URL
URL u = new URL(args[0]);
InputStream in = u.openStream( );
// 为增加性能存储输入流
in = new BufferedInputStream(in);
// 将输入流连接到阅读器
Reader r = new InputStreamReader(in);
int c;
while ((c = r.read( )) != -1)
{
System.out.print((char) c);
}
Object o = u.getContent( );
System.out.println("I got a " + o.getClass().getName( ));
}
catch (MalformedURLException e)
{
System.err.println(args[0] + " is not a parseable URL");
}
catch (IOException e)
{
System.err.println(e);
}
} // end if
} // end main
} // end SourceViewer}
import java.io.*;
import java点虐 .*;
public class Demo {
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入要显示源码的地址：");
URL url = new URL(br.readLine());
URLConnection conn = url.openConnection();
InputStream is = conn.getInputStream();
byte[] b = new byte[1024];
int len = 0;
while((len = is.read(b))!=-1){
System.out.println(new String(b,0,len,"UTF-8"));
}
}
}
//下班，控制台的，网页的你稍微修改一下就OK啦。