笔记

package com.yun.hello.controller.weathercontroller;


import com.itextpdf.text.BaseColor;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.pdf.*;
import com.yun.hello.domain.weather.City;
import com.yun.hello.domain.weather.WeatherResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


import java.awt.*;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.List;


@RestController
@RequestMapping("/itexpdf")
public class WeatherController {


    @GetMapping
    public void addWaterMark() throws Exception
    {
    //要输出的pdf文件
    BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("E:/abc.pdf")));
    //将pdf文件先加水印然后输出
    setWatermark(bos,"study.pdf","w" + "  下载使用人：" + "测试user", 16);
   }


    public static void setWatermark(BufferedOutputStream bos, String input,
                                    String waterMarkName, int permission)
            throws  Exception {
        PdfReader reader = new PdfReader(input);
        PdfStamper stamper = new PdfStamper(reader, bos);
        int total = reader.getNumberOfPages() + 1;
        PdfContentByte content;
        BaseFont base = BaseFont.createFont();
        PdfGState gs = new PdfGState();
        for (int i = 1; i < total; i++) {
            content = stamper.getOverContent(i);//在内容上方加水印
//content = stamper.getUnderContent(i);//在内容下方加水印
            gs.setFillOpacity(0.2f);
// content.setGState(gs);
            content.beginText();
            content.setColorFill(BaseColor.LIGHT_GRAY);
            content.setFontAndSize(base, 500);
            content.setTextMatrix(20, 20);
            content.showTextAligned(Element.ALIGN_CENTER, "公司内部文件，请注意保密！", 30,
                    30, 550);
            content.setColorFill(BaseColor.BLACK);
            content.setFontAndSize(base, 80);
            content.showTextAligned(Element.ALIGN_CENTER, "下载时间："
                    + waterMarkName + "", 300, 10, 0);
            content.endText();
        }
        stamper.close();
    }
}