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Java通过URL获取公众号文章生成HTML的方法

2020-02-13 11:33 399 查看

说明：通过公众号URL获取的内容，文字可以正常显示，但是图片存在跨域访问的问题，微信不允许跨域访问公众号图片，所以需要将公众号图片从存入本地后，再上传至OSS，然后把HTML中的图片全部替换为自己的OSS地址就可以了

这里就需要在后台对HTML进行DOM的解析，需要用的Jsoup

<dependency>
<groupId>com.aliyun.oss</groupId>
<artifactId>aliyun-sdk-oss</artifactId>
<version>2.2.3</version>

</dependency>
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.9.2</version>
</dependency>

controller

package com.iueang.controller;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.iueang.util.DownLoadImg;
import com.iueang.util.GetBody;
import com.iueang.util.OssUtil2;
import com.iueang.util.UrlUtil;
@Controller
public class TestUrl {

@RequestMapping("tohtml")
public String tohtml() {
return "html/index.html";
}
@RequestMapping("getHtml")
@ResponseBody
public Map<String,String> getHtml(String url){
//获取url文章生成文本
String html = UrlUtil.getAccess(url);
String reg = "<html>(.*?)</html>";
String head=GetBody.getSubUtilSimple(html, reg);
String HTTPHOST="http://yueang2.oss-cn-qingdao.aliyuncs.com/testimg/";
String newsBody=head;
Document doc = Jsoup.parse(newsBody);
Elements pngs = doc.select("img[data-src]");
System.out.println(pngs);
for (Element element : pngs) {
//获取图片地址
String imgUrl = element.attr("data-src");
//下载图片到本地
String filename=DownLoadImg.downloadPicture(imgUrl);
File file =new File("D:\\m2\\"+filename);
//上传至oss
Boolean flag = OssUtil2.uploadFileToOss(file, "testimg/"+filename);
if(flag) {
file.delete();
}
String newsrc =HTTPHOST + filename;
element.attr("src", newsrc);
}
newsBody = doc.toString();
System.out.println(newsBody);
Map<String,String> map=new HashMap<String, String>();
map.put("resultHtml", newsBody);
return map;

}
}

util工具类

GetBody类

package com.iueang.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GetBody {

public static String getSubUtilSimple(String html, String reg) {
Pattern pattern = Pattern.compile(reg);// 匹配的模式
Matcher m = pattern.matcher(html);
while(m.find()){
return m.group(1);
}
return "";
}

}

OssUtil类

package com.iueang.util;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.ObjectMetadata;

public class OssUtil2 {
//以下几个参数值必填，参考文章最后文档
static String endpoint = "http://oss-cn-qingdao.aliyuncs.com";
static String accessKeyId = "oss获取";
static String accessKeySecert = "oss获取";
static String bucketName = "yueang2";

/**
* 上传单个文件到OSS
* @param file 要上传的文件File对象
* @param objName 上传后的文件名，包含文件夹，比如 game/game/test.txt
* @return
*/
public static boolean uploadFileToOss(File file, String objName) {
try {
OSSClient ossClient = null;
try {
ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecert);
}catch (Exception e){
e.printStackTrace();
}
ObjectMetadata meta = new ObjectMetadata();
ossClient.putObject(bucketName, objName, file, meta);
ossClient.shutdown();
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
}

DownLoadImg类

package com.iueang.util;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.UUID;

import sun.misc.BASE64Encoder;
public class DownLoadImg {
public static String downloadPicture(String urlList) {
String filename="iueang"+UUID.randomUUID().toString()+".png";
String path="D:/m2/"+filename;
URL url = null;
try {
url = new URL(urlList);
DataInputStream dataInputStream = new DataInputStream(url.openStream());
FileOutputStream fileOutputStream = new FileOutputStream(new File(path));
ByteArrayOutputStream output = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];
int length;

while ((length = dataInputStream.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
BASE64Encoder encoder = new BASE64Encoder();
String encode = encoder.encode(buffer);
fileOutputStream.write(output.toByteArray());
dataInputStream.close();
fileOutputStream.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Download返回的filname="+filename);
return filename;
}
}

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标签： Java 公众号文章

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