Spring Boot实现图片上传/加水印一把梭操作实例代码

<dependencies>

<dependency>

<groupid>org.springframework.boot</groupid>

<artifactid>spring-boot-starter-web</artifactid>

</dependency>

<dependency>

<groupid>org.springframework.boot</groupid>

<artifactid>spring-boot-starter-test</artifactid>

<scope>test</scope>

</dependency>

<dependency>

<groupid>commons-io</groupid>

<artifactid>commons-io</artifactid>

<version> 2.5 </version>

</dependency>

</dependencies>

/**

* 功能：上传图片

* @param file 文件

* @param uploadpath 服务器上上传文件的路径

* @param physicaluploadpath 服务器上上传文件的物理路径

* @return 上传文件的 url相对地址

*/

public string uploadimage( multipartfile file, string uploadpath, string physicaluploadpath ) {

string filepath = physicaluploadpath + file.getoriginalfilename();

try {

file targetfile= new file(filepath);

fileutils.writebytearraytofile(targetfile, file.getbytes());

} catch (ioexception e) {

e.printstacktrace();

}

return uploadpath + "/" + file.getoriginalfilename();

}

}

@service

public class imagewatermarkservice {

/**

* imgfile 图像文件

* imagefilename 图像文件名

* uploadpath 服务器上上传文件的相对路径

* realuploadpath 服务器上上传文件的物理路径

*/

public string watermarkadd( file imgfile, string imagefilename, string uploadpath, string realuploadpath ) {

string imgwithwatermarkfilename = "watermark_" + imagefilename;

outputstream os = null ;

try {

image image = imageio.read(imgfile);

int width = image.getwidth( null );

int height = image.getheight( null );

bufferedimage bufferedimage = new bufferedimage(width,height,bufferedimage.type_int_rgb); // ①

graphics2d g = bufferedimage.creategraphics(); // ②

g.drawimage(image, 0 , 0 , width,height, null ); // ③

string logopath = realuploadpath + "/" + const .logo_file_name; // 水印图片地址

file logo = new file(logopath); // 读取水印图片

image imagelogo = imageio.read(logo);

int markwidth = imagelogo.getwidth( null ); // 水印图片的宽度和高度

int markheight = imagelogo.getheight( null );

g.setcomposite( alphacomposite.getinstance(alphacomposite.src_atop, const .alpha) ); // 设置水印透明度

g.rotate(math.toradians(- 10 ), bufferedimage.getwidth()/ 2 , bufferedimage.getheight()/ 2 ); // 设置水印图片的旋转度

int x = const .x;

int y = const .y;

int xinterval = const .x_interval;

int yinterval = const .y_interval;

double count = 1.5 ;

while ( x < width*count ) { // 循环添加多个水印logo

y = -height / 2 ;

while ( y < height*count ) {

g.drawimage(imagelogo, x, y, null ); // ④

y += markheight + yinterval;

}

x += markwidth + xinterval;

}

g.dispose();

os = new fileoutputstream(realuploadpath + "/" + imgwithwatermarkfilename);

jpegimageencoder en = jpegcodec.createjpegencoder(os); // ⑤

en.encode(bufferedimage); // ⑥

} catch (exception e) {

e.printstacktrace();

} finally {

if (os!= null ){

try {

os.close();

} catch (ioexception e) {

e.printstacktrace();

}

}

}

return uploadpath + "/" + imgwithwatermarkfilename;

}

}

@restcontroller

public class watermarkcontroller {

@autowired

private imageuploadservice imageuploadservice;

@autowired

private imagewatermarkservice watermarkservice;

@requestmapping (value = "/watermarktest" , method = requestmethod.post)

public imageinfo watermarktest( @requestparam ( "file" ) multipartfile image ) {

imageinfo imginfo = new imageinfo();

string uploadpath = "static/images/" ; // 服务器上上传文件的相对路径

string physicaluploadpath = getclass().getclassloader().getresource(uploadpath).getpath(); // 服务器上上传文件的物理路径

string imageurl = imageuploadservice.uploadimage( image, uploadpath, physicaluploadpath );

file imagefile = new file(physicaluploadpath + image.getoriginalfilename() );

string watermarkaddimageurl = watermarkservice.watermarkadd(imagefile, image.getoriginalfilename(), uploadpath, physicaluploadpath);

imginfo.setimageurl(imageurl);

imginfo.setlogoimageurl(watermarkaddimageurl);

return imginfo;

}

}