Java 利用 HttpURLConnection 读取页面 返回字节流（生成静态页面）

注：若需要被静态化的 页面中 使用了 response.sendRedirect跳转，则最后静态页面为 最终跳转后的页面。

而那些 使用js 跳转的 比如 window.location.href 则 无效，直接作为js代码在生成的静态页面中，并执行。

[java] view plain copy

print?

1. //保存为文件  

//保存为文件

[java] view plain copy

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1. import java.io.*;  
2. public class GenerateIndexPage {  
3.       
4.     protected static String defaultToFile = "frame/main_Null.html";  
5.     protected static String defaultFromFile = "http://localhost:8080/stfb/frame/main_Null.jsp";  
6.     String result = "";  
7.       
8.     public String genHtml(String fromFile,String toFile) throws Exception {  
9.         if("".equals(fromFile)||fromFile==null){  
10.             fromFile = defaultFromFile;  
11.         }  
12.         if("".equals(toFile)||toFile==null){  
13.             toFile = defaultToFile;  
14.         }  
15.         java.net.URL url = new java.net.URL(fromFile);  
16.         java.net.HttpURLConnection conn =(java.net.HttpURLConnection) url.openConnection();  
17.         try{  
18.             if (conn.getResponseCode() == 200) {  
19.               
20.                 java.io.InputStream is = (java.io.InputStream) conn.getContent();  
21.                 try{  
22.                     ConfigInfo cfn = new ConfigInfo();  
23.                     String server_path = cfn.getValue("server_path");  
24.                     String savePath = server_path+"\\"+toFile;  
25.                     FileOutputStream baos = new FileOutputStream(new File(savePath));  
26.                     int buffer = 1024;  
27.                     byte[] b = new byte[buffer];  
28.                     int n = 0;  
29.                     while ((n = is.read(b, 0, buffer)) > 0) {  
30.                         baos.write(b, 0, n);  
31.                     }  
32.                     //String s = new String(baos.toByteArray(), WEATHER_HTML_CHARSET);  
33.                     is.close();  
34.                     baos.close();  
35.                     result = "生成成功";  
36.                 }catch(Exception e){  
37.                     result="写文件过程出错，取消生成。";  
38.                 }  
39.             }else{  
40.                 result="获得链接过程出错，取消生成。";              
41.             }  
42.         }catch(Exception e){  
43.                 e.printStackTrace();  
44.                 result="获得内容过程出错，取消生成。";  
45.         }  
46.         return result;  
47.     }  
48.       
49.       
50. }  

import java.io.*;public class GenerateIndexPage {protected static String defaultToFile = "frame/main_Null.html";protected static String defaultFromFile = "http://localhost:8080/stfb/frame/main_Null.jsp";    String result = "";public String genHtml(String fromFile,String toFile) throws Exception {if("".equals(fromFile)||fromFile==null){fromFile = defaultFromFile;}if("".equals(toFile)||toFile==null){toFile = defaultToFile;}java.net.URL url = new java.net.URL(fromFile);java.net.HttpURLConnection conn =(java.net.HttpURLConnection) url.openConnection();try{if (conn.getResponseCode() == 200) {java.io.InputStream is = (java.io.InputStream) conn.getContent();try{ConfigInfo cfn = new ConfigInfo();String server_path = cfn.getValue("server_path");String savePath = server_path+"\\"+toFile;FileOutputStream baos = new FileOutputStream(new File(savePath));int buffer = 1024;byte[] b = new byte[buffer];int n = 0;while ((n = is.read(b, 0, buffer)) > 0) {baos.write(b, 0, n);}//String s = new String(baos.toByteArray(), WEATHER_HTML_CHARSET);is.close();baos.close();result = "生成成功";}catch(Exception e){result="写文件过程出错，取消生成。";}}else{result="获得链接过程出错，取消生成。";}}catch(Exception e){e.printStackTrace();result="获得内容过程出错，取消生成。";}return result;}}

//返回字节流

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1. public String getHtml(JspWriter out) throws Exception {  
2.     //System.setProperty("http.proxyHost", "isaserver");System.setProperty("http.proxyPort", "80");  
3.     java.net.URL url = new java.net.URL("http://weather.china.com.cn/city/58362_zx.html");  
4.     java.net.HttpURLConnection conn = (java.net.HttpURLConnection) url.openConnection();  
5.     if (conn.getResponseCode() == 200) {  
6.         java.io.InputStream is = (java.io.InputStream) conn.getContent();  
7.         java.io.ByteArrayOutputStream baos =   
8.             new java.io.ByteArrayOutputStream();  
9.           
10.         int buffer = 1024;  
11.         byte[] b = new byte[buffer];  
12.         int n = 0;  
13.         while ((n = is.read(b, 0, buffer)) > 0) {  
14.             baos.write(b, 0, n);  
15.         }  
16.         String s = new String(baos.toByteArray(), "UTF-8");  
17.         is.close();  
18.         baos.close();  
19.         return s;  
20.     }  
21.     return "";  
22. }  

public String getHtml(JspWriter out) throws Exception {//System.setProperty("http.proxyHost", "isaserver");System.setProperty("http.proxyPort", "80");java.net.URL url = new java.net.URL("http://weather.china.com.cn/city/58362_zx.html");java.net.HttpURLConnection conn = (java.net.HttpURLConnection) url.openConnection();if (conn.getResponseCode() == 200) {java.io.InputStream is = (java.io.InputStream) conn.getContent();java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream();int buffer = 1024;byte[] b = new byte[buffer];int n = 0;while ((n = is.read(b, 0, buffer)) > 0) {baos.write(b, 0, n);}String s = new String(baos.toByteArray(), "UTF-8");is.close();baos.close();return s;}return "";}