JSP转换成HTML生成静态页面解决换行符问题

package org.deyi.sc.yunwei;

import org.deyi.sc.util.Log;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
import java.util.HashMap;

public class Test {

    public static void main(String[] args) {
        String url = "http://localhost:8080/syscore/task/rptpub.do?seqno=DDN21010210_NTb01F_NRFGdEXY1&sites=undefined";
        writeHtml("D:/sina.html", getHtmlCode(url), "NO");

    }

    private static long star = 0;
    private static long end = 0;
    private static long ttime = 0;

    // 返回html代码
    private static String getHtmlCode(String httpUrl)//,int i, int j)
    {
        Date before = new Date();
        star = before.getTime();
        StringBuffer htmlCode = new StringBuffer();
        try {
            InputStream in;
            URL url = new java.net.URL(httpUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestProperty("User-Agent", "Mozilla/4.0");
            connection.connect();
            in = connection.getInputStream();
            java.io.BufferedReader breader = new BufferedReader(new InputStreamReader(in,
                    "UTF-8"));
            String currentLine;
            while ((currentLine = breader.readLine()) != null) {
                htmlCode.append(currentLine);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            Date after = new Date();
            end = after.getTime();
            ttime = end - star;
            System.out.println("执行时间:" + ttime + "毫秒");
        }
        return htmlCode.toString();
    }

    // 存储文件
    private static synchronized void writeHtml(String filePath, String info, String flag) {
        PrintWriter pw = null;
        try {
            File writeFile = new File(filePath);
            boolean isExit = writeFile.exists();
            if (isExit != true) {
                writeFile.createNewFile();
            } else {
                if (!flag.equals("NO")) {
                    writeFile.delete();
                    writeFile.createNewFile();
                }
            }
            pw = new PrintWriter(new FileOutputStream(filePath, true));
            pw.println(info);
            pw.close();
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        } finally {
            pw.close();
        }
    }


}

上面代码有生成后图表不显示问题

之后把输出流改为字节流问题解决

package org.deyi.sc.yunwei;

import org.deyi.sc.util.Log;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Date;
import java.util.HashMap;

public class Test {

    public static void main(String[] args) {
        String url = "http://localhost:8080/syscore/task/rptpub.do?seqno=DDN21010210_NTb01F_NRFGdEXY1&sites=undefined";
        writeHtml("D:/sina.html", getHtmlCode(url), "NO");

    }

    private static long star = 0;
    private static long end = 0;
    private static long ttime = 0;

    //	返回html代码
    private static String getHtmlCode(String httpUrl) {
        Date before = new Date();
        star = before.getTime();
        URL url;
        HttpURLConnection conn;
        try {
            url = new URL(httpUrl);
            conn = (HttpURLConnection) url.openConnection();
            if (conn.getResponseCode() == 200) {
                InputStream is = (InputStream) conn.getContent();
                ByteArrayOutputStream baos = new 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 = baos.toString("UTF-8");
                is.close();
                baos.flush();
                baos.close();
                return s;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            Date after = new Date();
            end = after.getTime();
            ttime = end - star;
            System.out.println("执行时间:" + ttime + "毫秒");
        }
        return "";
    }


    //	存储文件
    private static synchronized void writeHtml(String filePath, String info, String flag) {
        PrintWriter pw = null;
        try {
            File writeFile = new File(filePath);
            boolean isExit = writeFile.exists();
            if (isExit != true) {
                writeFile.createNewFile();
            } else {
                if (!flag.equals("NO")) {
                    writeFile.delete();
                    writeFile.createNewFile();
                }
            }
            pw = new PrintWriter(new FileOutputStream(filePath, true));
            pw.println(info);
            pw.close();
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        } finally {
            pw.close();
        }
    }


}

问题解析：

通过BufferedReader接收响应丢失响应结果中的换行符\n，举例如下

http预期响应：

0
SECTION
2
HEADER
9

通过BufferedReader解析代码如下

 BufferedReader in = new BufferedReader( new InputStreamReader(conn.getInputStream(), "utf-8" ));
 while ((line = in. readLine()) != null) {
        result += line + "\n";
  }
 in.close();

结果：

0SECTION2HEADER9

结果与预期值不符，改用ByteArrayOutputStream解析代码如下

ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 
byte[] data = new byte[ BUFFER_SIZE]; 
int count = -1; 
while((count = in.read(data,0, BUFFER_SIZE)) != -1)
outStream.write(data, 0, count);
in.close();
data = null; 
return new String(outStream.toByteArray(),encoding); =

响应结果为预期结果

原因分析：
BufferedReader使用readLine（）来读取的，意思是一行一行的来读取，读到回车符的时候，就先返回给字符串，然后再进行下一行的读取，导致响应结果中确实换行符。