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。

//保存为文件

</pre><pre name="code" class="html">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

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 "";}