图片处理：html文本获取图片Url，判断图片大小，存数据库
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了图片处理：html文本获取图片Url，判断图片大小，存数据库，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含13565字，纯文字阅读大概需要20分钟。
内容图文
1.从html文本获取图片Url
/**
* html文本中取出url链接
*/
public class Url {
public static void main(String[] args) {
String content="<div><img src='123.jpg'/>ufiolk<img src='456.jpg'/></div>";
List<String> imgUrls = parseImg(content);
for (String imgUrl : imgUrls) {
System.out.println(imgUrl);
}
}
public static List<String> parseImg(String content){
Element doc = Jsoup.parseBodyFragment(content).body();
Elements elements = doc.select("img[src]");
List<String> imgUrls = new ArrayList<>(elements == null ? 1 : elements.size());
for (Element element : elements) {
String imgUrl = element.attr("src");
if(StringUtils.isNotBlank(imgUrl)){
imgUrls.add(imgUrl);
}
}
return imgUrls;
}
}
2.判断图片大小，格式
public class Url {
public static void main(String[] args) {
boolean b = checkImageSize(new File("C:\\Users\\吕厚厚\\Pictures\\Warframe\\wallhaven-760559 (1).png"), 1 * 1024L);
System.out.println(b);
}
/**
* 校验图片的大小
* @param file 文件
* @param imageSize 图片最大值(KB)
* @return true：上传图片小于图片的最大值
*/
public static boolean checkImageSize(File file, Long imageSize) {
if (!file.exists()) {
return false;
}
System.out.println("file.length："+ file.length());
Long size = file.length() / 1024; // 图片大小(得到的是字节数，需除以1024，转化为KB)
System.out.println("size:"+size);
Long maxImageSize = null;
if (maxImageSize == null) {
maxImageSize = 2 * 1024L;// 图片最大不能超过2M（2048kb）
} else {
maxImageSize = maxImageSize * 1024;
}
if (size > maxImageSize) {
return false;
}
if (imageSize == null) {
return true;
}
if (size.intValue() <= imageSize) {
return true;
}
return false;
}
//根据文件名判断图片是否为要求的格式
public static boolean checkImageType(String fileFullname){
//获取图片扩展名
String type = fileFullname.substring(fileFullname.lastIndexOf(".") + 1);
//判断是否为要求的格式
if (type == "bmp" || type == "jpg" || type == "jpeg" || type == "gif" || type == "JPG" || type == "JPEG" || type == "BMP" || type == "GIF") {
return true;
}
return false;
}
}
根据流判断图片类型
//测试根据文件流判断图片类型
@Test
public void judgeImageType(){
PicVO pic = weixinReleaseMaterialDao.getPic("a00394c9-4db4-43c6-adc7-d7d3019624ed");
if(pic==null||pic.getBinaryPic()==null){
throw new RuntimeException("从数据库取出二进制数据的字节数组为空");
}
byte[] binaryPic =pic.getBinaryPic();
String picType = getPicType(binaryPic);
System.out.println("pic____"+picType);
}
/**
* 根据文件流判断图片类型
* @param
* @return jpg/png/gif/bmp
*/
public static String getPicType(byte[] src) {
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < 4; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
String type = stringBuilder.toString().toUpperCase();
if (type.contains("FFD8FF")) {
return IMG_JPG;
} else if (type.contains("89504E47")) {
return IMG_PNG;
} else if (type.contains("47494638")) {
return IMG_GIF;
} else if (type.contains("424D")) {
return IMG_BMP;
}else{
return "";
}
}
3. 根据URL下载图片
public class Url {
public static void main(String[] args) {
/*String content="<div><img src='123.jpg'/>ufiolk<img src='456.jpg'/></div>";
List<String> imgUrls = parseImg(content);
for (String imgUrl : imgUrls) {
System.out.println(imgUrl);
}*/
/*boolean b = checkImageSize(new File("C:\\Users\\吕厚厚\\Pictures\\Warframe\\wallhaven-760559 (1).png"), 1 * 1024L);
System.out.println(b);*/
//根据url下载图片
String imgUrl="https://pics4.baidu.com/feed/a8014c086e061d950b35770c91eacad462d9cab3.jpeg?token=c41d6d4d1b4c59af07a9bfc2b874b245&s=702A955598FECFCC341BFCEF0300E038";
InputStream inputStream = downloadImgByUrl(imgUrl);
try {
byte[] s = IOUtils.toByteArray(inputStream);//byte数组接收
System.out.println(s);
} catch (IOException e) {
e.printStackTrace();
}
}
public static InputStream downloadImgByUrl(String imageUrl) {
InputStream inputStream = null;
inputStream = ImgUtils.getByUrl(imageUrl);//通过url下载并得到输入流
if (null == inputStream) {
throw new RuntimeException("下载文件出错，输入流为空");
}
return inputStream;
}
3.存图片到数据库
数据类型选择：
BLOB类型的字段用于存储二进制数据
MySQL中，BLOB是个类型系列，包括：TinyBlob、Blob、MediumBlob、LongBlob，这几个类型之间的唯一区别是在存储文件的最大大小上不同。
MySQL的四种BLOB类型
类型 大小(单位：字节)
TinyBlob 最大 255
Blob 最大 65K
MediumBlob 最大 16M
LongBlob 最大 4G
从数据库查出图片：
直接查出表里的整个对象，避免byte[] 不知道对应的resultType的问题。
/**Mybatis3.0
*Dao层
* @param picId
* @return
*/
public PicVO getPic(String picId){
Map<String, Object> param = new HashMap<>();
param.put("picId", picId);
return super.selectOne(apperNameSpace .concat("queryPic"),param);
}
<!--查询二进制图片-->
<select id="queryPic" resultMap="picMap" parameterType="java.util.Map">
select ID ,PIC_ID ,BINARY_PIC
from zycf_mediaoperate_pics
where 1=1
<if test="picId!=null">
and PIC_ID=#{picId,jdbcType=VARCHAR}
</if>
</select>
<resultMap id="picMap" type="Bean.PicVO">
<result column="ID" jdbcType="VARCHAR" property="id"/>
<result column="PIC_ID" jdbcType="VARCHAR" property="picId"/>
<result column="BINARY_PIC" property="binaryPic" jdbcType="LONGVARBINARY" />
</resultMap>
4.形成图片文件
//根据图片id从数据库取出二进制数据
String[] split = StringUtils.split(articlePicsId,",");
if(split==null||split.length==0){
//throw new RuntimeException("split__为空");
}
for (int i = 0; i <split.length ; i++) {
PicVO pic = weixinReleaseMaterialDao.getPic(split[i]);
if(pic==null||pic.getBinaryPic()==null){
//throw new RuntimeException("从数据库取出二进制数据的字节数组为空");
}
byte[] binaryPic =pic.getBinaryPic();
//转为图片文件
File image = getImage(binaryPic);
//字节数组转为图片文件
private static File getImage(byte[] bytes){
try {
String tmpRootPath;
String tmp = System.getProperty("java.io.tmpdir");
if(tmp.endsWith(File.separator)){
tmpRootPath = tmp;
}else{
tmpRootPath = tmp.concat(File.separator);
}
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
File jpgfile = new File(tmpRootPath.concat("123.jpg"));
FileUtils.copyInputStreamToFile(bais, jpgfile);
/* BufferedImage bi1 = ImageIO.read(bais);
//String tempPath = PropertiesUtil.getProperty("trs-config.properties","mailTempDir");
// 文件名
File w2 = new File("C:\\Users\\吕厚厚\\Pictures\\Warframe", "123.jpg");// 可以是jpg,png,gif格式
ImageIO.write(bi1, "jpg", w2);// 不管输出什么格式图片，此处不需改动
*/
return jpgfile;
} catch (IOException e) {
e.getMessage();
e.printStackTrace();
}
return null;
}
5.图片上传
//利用HttpPostUtil
HttpPostUtil u = new HttpPostUtil(requestUrl);
u.addFileParameter("img", new File(filePath));
//发送数据到服务器,解析返回数据
JSONObject result = JSONObject.parseObject(new String(u.send()));
HttpPostUtil：
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class HttpPostUtil {
URL url;
HttpURLConnection conn;
String boundary = "--------httppost123";
Map<String, String> textParams = new HashMap<String, String>();
Map<String, File> fileparams = new HashMap<String, File>();
DataOutputStream ds;
public HttpPostUtil(String url) throws Exception {
this.url = new URL(url);
}
//重新设置要请求的服务器地址，即上传文件的地址。
public void setUrl(String url) throws Exception {
this.url = new URL(url);
}
//增加一个普通字符串数据到form表单数据中
public void addTextParameter(String name, String value) {
textParams.put(name, value);
}
//增加一个文件到form表单数据中
public void addFileParameter(String name, File value) {
fileparams.put(name, value);
}
// 发送数据到服务器，返回一个字节包含服务器的返回结果的数组
public byte[] send() throws Exception {
initConnection();
try {
conn.connect();
} catch (SocketTimeoutException e) {
// something
throw new RuntimeException();
}
ds = new DataOutputStream(conn.getOutputStream());
writeFileParams();
writeStringParams();
paramsEnd();
InputStream in = conn.getInputStream();
ByteArrayOutputStream out = new ByteArrayOutputStream();
int b;
while ((b = in.read()) != -1) {
out.write(b);
}
conn.disconnect();
return out.toByteArray();
}
//文件上传的connection的一些必须设置
private void initConnection() throws Exception {
conn = (HttpURLConnection) this.url.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setConnectTimeout(10000); //连接超时为10秒
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
}
//普通字符串数据
private void writeStringParams() throws Exception {
Set<String> keySet = textParams.keySet();
for (Iterator<String> it = keySet.iterator(); it.hasNext();) {
String name = it.next();
String value = textParams.get(name);
ds.writeBytes("--" + boundary + "\r\n");
ds.writeBytes("Content-Disposition: form-data; name=\"" + name
+ "\"\r\n");
ds.writeBytes("\r\n");
ds.writeBytes(encode(value) + "\r\n");
}
}
//文件数据
private void writeFileParams() throws Exception {
Set<String> keySet = fileparams.keySet();
for (Iterator<String> it = keySet.iterator(); it.hasNext();) {
//update-begin-author:taoYan date:20180601 for:文件加入http请求，当文件非本地资源的时候需要作特殊处理--
String name = it.next();
File value = fileparams.get(name);
String valuename = value.getName();
if(value.exists()){
ds.writeBytes("--" + boundary + "\r\n");
ds.writeBytes("Content-Disposition: form-data; name=\"" + name
+ "\"; filename=\"" + encode(valuename) + "\"\r\n");
ds.writeBytes("Content-Type: " + getContentType(value) + "\r\n");
ds.writeBytes("\r\n");
ds.write(getBytes(value));
}else{
String myFilePath = value.getPath();
if(myFilePath!=null && myFilePath.startsWith("http")){
byte[] netFileBytes = getURIFileBytes(myFilePath);
String lowerValueName = valuename.toLowerCase();
if(lowerValueName.endsWith(IMG_BMP)||lowerValueName.endsWith(IMG_GIF)||lowerValueName.endsWith(IMG_JPG)||lowerValueName.endsWith(IMG_PNG)){
valuename = encode(valuename);
}else{
valuename = System.currentTimeMillis()+getPicType(netFileBytes);
}
ds.writeBytes("--" + boundary + "\r\n");
ds.writeBytes("Content-Disposition: form-data; name=\"" + name
+ "\"; filename=\"" + valuename + "\"\r\n");
ds.writeBytes("Content-Type: " + getContentType(value) + "\r\n");
ds.writeBytes("\r\n");
ds.write(netFileBytes);
}
}
//update-end-author:taoYan date:20180601 for:文件加入http请求，当文件非本地资源的时候需要作特殊处理--
ds.writeBytes("\r\n");
}
}
/**
* 通过文件的网络地址转化成流再读到字节数组中去
*/
private byte[] getURIFileBytes(String url) throws IOException{
url = url.replace("http:"+File.separator,"http://").replace("\\","/");
URL oracle = new URL(url);
InputStream inStream = oracle.openStream();
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
inStream.close();
return outStream.toByteArray();
}
//获取文件的上传类型，图片格式为image/png,image/jpg等。非图片为application/octet-stream
private String getContentType(File f) throws Exception {
// return "application/octet-stream"; // 此行不再细分是否为图片，全部作为application/octet-stream 类型
ImageInputStream imagein = ImageIO.createImageInputStream(f);
if (imagein == null) {
return "application/octet-stream";
}
Iterator<ImageReader> it = ImageIO.getImageReaders(imagein);
if (!it.hasNext()) {
imagein.close();
return "application/octet-stream";
}
imagein.close();
return "image/" + it.next().getFormatName().toLowerCase();//将FormatName返回的值转换成小写，默认为大写
}
//把文件转换成字节数组
private byte[] getBytes(File f) throws Exception {
FileInputStream in = new FileInputStream(f);
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] b = new byte[1024];
int n;
while ((n = in.read(b)) != -1) {
out.write(b, 0, n);
}
in.close();
return out.toByteArray();
}
//添加结尾数据
private void paramsEnd() throws Exception {
ds.writeBytes("--" + boundary + "--" + "\r\n");
ds.writeBytes("\r\n");
}
// 对包含中文的字符串进行转码，此为UTF-8。服务器那边要进行一次解码
private String encode(String value) throws Exception{
return URLEncoder.encode(value, "UTF-8");
}
//update-begin-author:taoYan date:20180601 for:增加图片类型常量--
public static final String IMG_JPG = ".jpg";
public static final String IMG_PNG = ".png";
public static final String IMG_GIF = ".gif";
public static final String IMG_BMP = ".bmp";
/**
* 根据文件流判断图片类型
* @param
* @return jpg/png/gif/bmp
*/
public String getPicType(byte[] src) {
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < 4; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
String type = stringBuilder.toString().toUpperCase();
if (type.contains("FFD8FF")) {
return IMG_JPG;
} else if (type.contains("89504E47")) {
return IMG_PNG;
} else if (type.contains("47494638")) {
return IMG_GIF;
} else if (type.contains("424D")) {
return IMG_BMP;
}else{
return "";
}
}
//update-end-author:taoYan date:20180601 for:根据文件流判断图片类型--
public static void main(String[] args) throws Exception {
HttpPostUtil u = new HttpPostUtil("https://api.weixin.qq.com/cgi-bin/media/uploadimg?access_token=i3um002Np_n-mgNVbPP9JEIfft7_hRq3eHE86slxI7Uh_5q0K5rFfLRnhD20HTCcFt92ulWnndpGlyiNgXi6UiWQqKxPCBsfYKmiY6Ws-isUVLaAFAXYO");
u.addFileParameter("img", new File("C:/Users/zhangdaihao/Desktop/2.png"));
byte[] b = u.send();
String result = new String(b);
System.out.println(result);
}
}
内容总结
以上是互联网集市为您收集整理的图片处理：html文本获取图片Url，判断图片大小，存数据库全部内容，希望文章能够帮你解决图片处理：html文本获取图片Url，判断图片大小，存数据库所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。
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