1.從html文本獲取圖片Url
/**
* html文本中取出url鏈接
*/
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.判斷圖片大小,格式
public class Url {
public static void main(String[] args) {
boolean b = checkImageSize(new File("C:\\Users\\呂厚厚\\Pictures\\Warframe\\wallhaven-760559 (1).png"), 1 * 1024L);
System.out.println(b);
}
/**
* 校驗圖片的大小
* @param file 文件
* @param imageSize 圖片最大值(KB)
* @return true:上傳圖片小於圖片的最大值
*/
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; // 圖片大小(得到的是字節數,需除以1024,轉化爲KB)
System.out.println("size:"+size);
Long maxImageSize = null;
if (maxImageSize == null) {
maxImageSize = 2 * 1024L;// 圖片最大不能超過2M(2048kb)
} else {
maxImageSize = maxImageSize * 1024;
}
if (size > maxImageSize) {
return false;
}
if (imageSize == null) {
return true;
}
if (size.intValue() <= imageSize) {
return true;
}
return false;
}
//根據文件名判斷圖片是否爲要求的格式
public static boolean checkImageType(String fileFullname){
//獲取圖片擴展名
String type = fileFullname.substring(fileFullname.lastIndexOf(".") + 1);
//判斷是否爲要求的格式
if (type == "bmp" || type == "jpg" || type == "jpeg" || type == "gif" || type == "JPG" || type == "JPEG" || type == "BMP" || type == "GIF") {
return true;
}
return false;
}
}
根據流判斷圖片類型
//測試根據文件流判斷圖片類型
@Test
public void judgeImageType(){
PicVO pic = weixinReleaseMaterialDao.getPic("a00394c9-4db4-43c6-adc7-d7d3019624ed");
if(pic==null||pic.getBinaryPic()==null){
throw new RuntimeException("從數據庫取出二進制數據的字節數組爲空");
}
byte[] binaryPic =pic.getBinaryPic();
String picType = getPicType(binaryPic);
System.out.println("pic____"+picType);
}
/**
* 根據文件流判斷圖片類型
* @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. 根據URL下載圖片
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\\呂厚厚\\Pictures\\Warframe\\wallhaven-760559 (1).png"), 1 * 1024L);
System.out.println(b);*/
//根據url下載圖片
String imgUrl="https://pics4.baidu.com/feed/a8014c086e061d950b35770c91eacad462d9cab3.jpeg?token=c41d6d4d1b4c59af07a9bfc2b874b245&s=702A955598FECFCC341BFCEF0300E038";
InputStream inputStream = downloadImgByUrl(imgUrl);
try {
byte[] s = IOUtils.toByteArray(inputStream);//byte數組接收
System.out.println(s);
} catch (IOException e) {
e.printStackTrace();
}
}
public static InputStream downloadImgByUrl(String imageUrl) {
InputStream inputStream = null;
inputStream = ImgUtils.getByUrl(imageUrl);//通過url下載並得到輸入流
if (null == inputStream) {
throw new RuntimeException("下載文件出錯,輸入流爲空");
}
return inputStream;
}
3.存圖片到數據庫
數據類型選擇:
BLOB類型的字段用於存儲二進制數據
MySQL中,BLOB是個類型系列,包括:TinyBlob、Blob、MediumBlob、LongBlob,這幾個類型之間的唯一區別是在存儲文件的最大大小上不同。
MySQL的四種BLOB類型
類型 大小(單位:字節)
TinyBlob 最大 255
Blob 最大 65K
MediumBlob 最大 16M
LongBlob 最大 4G
從數據庫查出圖片:
直接查出表裏的整個對象,避免byte[] 不知道對應的resultType的問題。
/**Mybatis3.0
*Dao層
* @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);
}
<!--查詢二進制圖片-->
<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.形成圖片文件
//根據圖片id從數據庫取出二進制數據
String[] split = StringUtils.split(articlePicsId,",");
if(split==null||split.length==0){
//throw new RuntimeException("split__爲空");
}
for (int i = 0; i <split.length ; i++) {
PicVO pic = weixinReleaseMaterialDao.getPic(split[i]);
if(pic==null||pic.getBinaryPic()==null){
//throw new RuntimeException("從數據庫取出二進制數據的字節數組爲空");
}
byte[] binaryPic =pic.getBinaryPic();
//轉爲圖片文件
File image = getImage(binaryPic);
//字節數組轉爲圖片文件
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\\呂厚厚\\Pictures\\Warframe", "123.jpg");// 可以是jpg,png,gif格式
ImageIO.write(bi1, "jpg", w2);// 不管輸出什麼格式圖片,此處不需改動
*/
return jpgfile;
} catch (IOException e) {
e.getMessage();
e.printStackTrace();
}
return null;
}
5.圖片上傳
//利用HttpPostUtil
HttpPostUtil u = new HttpPostUtil(requestUrl);
u.addFileParameter("img", new File(filePath));
//發送數據到服務器,解析返回數據
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);
}
//重新設置要請求的服務器地址,即上傳文件的地址。
public void setUrl(String url) throws Exception {
this.url = new URL(url);
}
//增加一個普通字符串數據到form表單數據中
public void addTextParameter(String name, String value) {
textParams.put(name, value);
}
//增加一個文件到form表單數據中
public void addFileParameter(String name, File value) {
fileparams.put(name, value);
}
// 發送數據到服務器,返回一個字節包含服務器的返回結果的數組
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();
}
//文件上傳的connection的一些必須設置
private void initConnection() throws Exception {
conn = (HttpURLConnection) this.url.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setConnectTimeout(10000); //連接超時爲10秒
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
}
//普通字符串數據
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");
}
}
//文件數據
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請求,當文件非本地資源的時候需要作特殊處理--
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請求,當文件非本地資源的時候需要作特殊處理--
ds.writeBytes("\r\n");
}
}
/**
* 通過文件的網絡地址轉化成流再讀到字節數組中去
*/
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();
}
//獲取文件的上傳類型,圖片格式爲image/png,image/jpg等。非圖片爲application/octet-stream
private String getContentType(File f) throws Exception {
// return "application/octet-stream"; // 此行不再細分是否爲圖片,全部作爲application/octet-stream 類型
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();//將FormatName返回的值轉換成小寫,默認爲大寫
}
//把文件轉換成字節數組
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();
}
//添加結尾數據
private void paramsEnd() throws Exception {
ds.writeBytes("--" + boundary + "--" + "\r\n");
ds.writeBytes("\r\n");
}
// 對包含中文的字符串進行轉碼,此爲UTF-8。服務器那邊要進行一次解碼
private String encode(String value) throws Exception{
return URLEncoder.encode(value, "UTF-8");
}
//update-begin-author:taoYan date:20180601 for:增加圖片類型常量--
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";
/**
* 根據文件流判斷圖片類型
* @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:根據文件流判斷圖片類型--
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);
}
}