编译此servlet代码时出现编译错误

package hall; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.net.*; 

public class UrlConnect { 
    public static final String DOCTYPE = 
    "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">"; 

    public static String headWithTitle(String title) { 
    return(DOCTYPE + "\n" + 
      "<HTML>\n" + 
      "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n"); 
    } 

    /** Read a parameter with the specified name, convert it to an int, 
     and return it. Return the designated default value if the parameter 
     doesn't exist or if it is an illegal integer format. 
    */ 

} 
public static void main(String[] args) throws Exception { 

    URL url = new URL("http://www.xyz.com"); 

    HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
    conn.setConnectTimeout(5000); // 5 seconds 
    conn.setRequestMethod("GET");  
    conn.connect(); 
    BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); 

    String line; 
    StringBuffer bf = new StringBuffer(); 
    while ((line = rd.readLine()) != null) { 
     bf.append(line); 
    } 
    conn.disconnect(); 

    //... pass bf to an XML parser and do your processing... 
}

编译此java servlet代码时出现编译错误。我的编码错误在哪里，我应该包含任何其他库吗？编译此servlet代码时出现编译错误

这是我的错误日志

UrlConnect.java:22: class, interface, or enum expected 
public static void main(String[] args) throws Exception { 
      ^
UrlConnect.java:26: class, interface, or enum expected 
    HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
^
UrlConnect.java:27: class, interface, or enum expected 
    conn.setConnectTimeout(5000); // 5 seconds 
^
UrlConnect.java:28: class, interface, or enum expected 
    conn.setRequestMethod("GET");  
^
UrlConnect.java:29: class, interface, or enum expected 
    conn.connect(); 
^
UrlConnect.java:30: class, interface, or enum expected 
    BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
^
UrlConnect.java:32: class, interface, or enum expected 
    String line; 
^
UrlConnect.java:33: class, interface, or enum expected 
    StringBuffer bf = new StringBuffer(); 
^
UrlConnect.java:34: class, interface, or enum expected 
    while ((line = rd.readLine()) != null) { 
^
UrlConnect.java:36: class, interface, or enum expected 
    } 
^
UrlConnect.java:40: class, interface, or enum expected 
} 
^ 
11 errors

来源

2010-12-08 Hick

发布一些错误日志，它很难猜测错误。 – 2010-12-08 06:35:41

尝试;

在public static void main(String[] args) throws Exception之前删除“}”并将其放到文件结尾。

来源

2010-12-08 06:40:09

a）主要应该在类内
b）一些进口缺失。

这里是你的代码应该怎么看起来像

package hall; 

import java.io.BufferedReader; 
import java.io.InputStreamReader; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.net.*; 

public class UrlConnect { 

    public static final String DOCTYPE = 
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">"; 

    public static String headWithTitle(String title) { 
     return (DOCTYPE + "\n" + 
       "<HTML>\n" + 
       "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n"); 
    } 

    /** Read a parameter with the specified name, convert it to an int, 
    and return it. Return the designated default value if the parameter 
    doesn't exist or if it is an illegal integer format. 
    */ 
    public static void main(String[] args) throws Exception { 

     URL url = new URL("http://www.xyz.com"); 

     HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
     conn.setConnectTimeout(5000); // 5 seconds 
     conn.setRequestMethod("GET"); 
     conn.connect(); 
     BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); 

     String line; 
     StringBuffer bf = new StringBuffer(); 
     while ((line = rd.readLine()) != null) { 
      bf.append(line); 
     } 
     conn.disconnect(); 

    //... pass bf to an XML parser and do your processing... 
    } 
}

来源

2010-12-08 06:43:23

这不是Servlet的。它是一个简单的Java程序，可以由命令行执行。

这是一个Servlet：从复制

package test; 

import java.io.*; 

import javax.servlet.http.*; 
import javax.servlet.*; 

public class HelloServlet extends HttpServlet { 
    public void doGet (HttpServletRequest req, 
        HttpServletResponse res) 
    throws ServletException, IOException 
    { 
    PrintWriter out = res.getWriter(); 

    out.println("Hello, world!"); 
    out.close(); 
    } 
}

： http://www.caucho.com/resin-3.0/servlet/tutorial/helloworld/index.xtp

来源

2010-12-08 11:02:40

编译此servlet代码时出现编译错误

回答

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