JAVA-替换html中图片的路径-从html代码中提取图片路径并下载(完整版)

transHtml方法实现提取网络图片中得图片路径,将其重新下载到本地,并替换html中原来得路径
package com.googosoft.until;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest; /**
* @author sonyan
* @version 2019年11月25日 下午2:12:32
* @desc
*/
public class Test { /**
* 将html中的图片下载到服务器,并且使用服务器上图片的地址替换图片的网络路径
* @param html 要处理的html
* @param request
* @param uploadFolder 服务器上保存图片的目录
* @return
*/
public static String transHtml(String html,HttpServletRequest request,String uploadFolder){
List<String> imgList = getImgStrList(html,request);
for (String imgStr : imgList) {
try {
String newUrl = reSaveImage(imgStr, request,uploadFolder);
html = html.replace(imgStr, newUrl);
} catch (Exception e) {
e.printStackTrace();
}
}
return html;
} /**
* 将指定的网络图片保存到本地指定目录
* @param httpUrl 图片原来的网络路径
* @param request
* @param uploadFolder 服务器上保存图片的目录
* @return httpUrl newPath
*/
private static String reSaveImage(String httpUrl, HttpServletRequest request,String uploadFolder){
FileOutputStream out = null;
BufferedInputStream in = null;
HttpURLConnection connection = null;
Map<String, Object> urlMap = new HashMap<>(); byte[] buf = new byte[1024];
int len = 0;
try {
URL url = new URL(httpUrl);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
in = new BufferedInputStream(connection.getInputStream());
urlMap = getNewPath(httpUrl, request,uploadFolder);
out = new FileOutputStream(urlMap.get("newPath").toString());
while ((len = in.read(buf)) != -1) {
out.write(buf, 0, len);
}
out.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
in.close();
out.close();
connection.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
} return urlMap.get("newUrl").toString();
} /**
* 获取保存在服务器上的图片的实际存储地址以及访问地址
* @param httpUrl 图片原来的网络路径
* @param request
* @param uploadFolder服务器上保存图片的目录
* @return
*/
private static Map<String, Object> getNewPath(String httpUrl, HttpServletRequest request,String uploadFolder) {
Map<String, Object> relMap = new HashMap<>();
String fileName = getFileName();
String filefix = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();// 文件后缀
fileName = UuidUtil.get32UUID() + "." + filefix;
String prefix = getUrlPrefix(request) + "/iconimg/";
relMap.put("newUrl", prefix + fileName);
relMap.put("newPath", uploadFolder + fileName);
return relMap;
} /**
* 设置图片的名称(时间+用户编号)
* @return
*/
private static String getFileName() {
return "reload"+File.pathSeparator+new Date().getTime()+".jpg";
} /**
* 提取HTML字符串中的img
* @param htmlStr 要处理的html字符串
* @return
*/
private static List<String> getImgStrList(String htmlStr,HttpServletRequest request) {
List<String> list = new ArrayList<>();
String img = "";
Pattern p_image;
Matcher m_image;
String regEx_img = "<img.*src\\s*=\\s*(.*?)[^>]*?>";
p_image = Pattern.compile(regEx_img, Pattern.CASE_INSENSITIVE);
m_image = p_image.matcher(htmlStr);
while (m_image.find()) {
img = m_image.group();
Matcher m = Pattern.compile("src\\s*=\\s*\"?(.*?)(\"|>|\\s+)").matcher(img);
while (m.find()) {
String path = m.group(1);
if(!path.startsWith(getUrlPrefix(request))){
list.add(handleSrc(path));
}
}
}
return list;
} /**
* 去除src路径中的前后引号
* @param src 图片的src路径
* @return
*/
private static String handleSrc(String src) {
if (src != null) {
if (src.startsWith("'")|| src.startsWith("\"")) {
return src.substring(1, src.length());
}
if (src.endsWith("'")|| src.endsWith("\"")) {
return src.substring(0, src.length());
}
}
return src;
} /**
* 获取网站的URL
* @param request
* @return 例如:http://192.168.11.3:8089
*/
public static String getUrlPrefix(HttpServletRequest request) {
StringBuffer str = new StringBuffer();
str.append(request.getScheme());
str.append("://");
str.append(request.getServerName());
if (80 != request.getServerPort()) {
str.append(":" + request.getServerPort());
}
str.append(request.getContextPath());
return str.toString();
}
}
上一篇:JAVA代码中获取JVM信息


下一篇:一次简单的ORM调研