java使用itext如何直接生成pdf

        <dependency>
            <groupid>com.itextpdf</groupid>
            <artifactid>itextpdf</artifactid>
            <version>5.5.13</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.itextpdf/itext-asian -->
<dependency>
    <groupid>com.itextpdf</groupid>
    <artifactid>itext-asian</artifactid>
    <version>5.2.0</version>
</dependency>

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.pdfwriter;

import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.util.logging.level;
import java.util.logging.logger;

/**
 * 生成一个内容为“hello world”的pdf文件
 * @author ym
 */
public class helloworld {

    public static void main(string[] args) {
        string file_dir = "./"; // 项目根目录：盘符:/.../.../项目名称，注意：点号并不表示当前类文件所在的目录，而是项目目录下
        //step 1—create a document.  
        document document = new document();
        try {
            //step 2—get a pdfwriter instance.
            pdfwriter.getinstance(document, new fileoutputstream(file_dir + "createsamplepdf.pdf"));
            //step 3—open the document.  
            document.open();
            //step 4—add content.  
            document.add(new paragraph("hello world"));
            //step 5—close the document.  
            document.close();
        } catch (documentexception ex) {
            logger.getlogger(helloworld.class.getname()).log(level.severe, null, ex);
        } catch (filenotfoundexception ex) {
            logger.getlogger(helloworld.class.getname()).log(level.severe, null, ex);
        }
    }
}

      //页面大小  
      rectangle rect = new rectangle(pagesize.a4.rotate());
      //页面背景色  
      rect.setbackgroundcolor(basecolor.orange);
      //  page , 外边距 marginleft marginright margintop marginbottom
      document doc = new document(rect,90, 90, 30, 40);  
      // 新开一页
      doc.newpage();
		

      /**
      * 段落设置
      */
     paragraph titleparagraph = new paragraph("hello world!", getchinesetitlefont());
     titleparagraph.setalignment(element.align_center);// 居中
     titleparagraph.setfirstlineindent(24);// 首行缩进
     titleparagraph.setleading(35f);// 行间距
     titleparagraph.setspacingbefore(5f);// 设置上空白
     titleparagraph.setspacingafter(10f);// 设置段落下空白



    //支持中文 设置字体，字体颜色、大小等
    public font getchinesetitlefont() throws runtimeexception {
        font chinesefont = null;
        try {
        	/**
             *  name – the name of the font or its location on file 
             *  encoding – the encoding to be applied to this font 
             *  embedded – true if the font is to be embedded in the pdf
             */
            basefont simpchinese = basefont.createfont("stsongstd-light", "unigb-ucs2-h", basefont.not_embedded);
            chinesefont = new font(simpchinese, 15, font.bold, basecolor.black);
        } catch (documentexception e) {
            log.error("getchinesefont" ,"字体异常",e);
            throw new runtimeexception("getchinesefont字体异常",e);
        } catch (ioexception e) {
            log.error("getchinesefont" ,"字体异常",e);
            throw new runtimeexception("getchinesefont字体异常",e);
        }
        return chinesefont;
    }

// 文本内容
string content = "this is a sample text with different colors.";
string[] words = content.split(" "); // 将文本拆分为单词

for (string word : words) {
    chunk chunk = new chunk(word); // 创建一个新的 chunk

    // 如果单词是 "different"，则设置为红色
    if (word.equals("different")) {
        chunk.setforegroundcolor(basecolor.red);
    }

    // 如果单词是 "colors."，则设置为蓝色
    if (word.equals("colors.")) {
        chunk.setforegroundcolor(basecolor.blue);
    }

    contentparagraph.add(chunk); // 将 chunk 添加到段落中
    contentparagraph.add(" "); // 添加单词之间的空格
}

document.add(contentparagraph); // 将段落添加到文档中

            // 创建一个包含5列的表格
            pdfptable table = new pdfptable(5);

            // 添加表头
            table.addcell("header 1");
            table.addcell("header 2");
            table.addcell("header 3");
            table.addcell("header 4");
            table.addcell("header 5");

            // 添加动态数据到表格
            for (int i = 0; i < 10; i++) {
                table.addcell("data " + i + ", 1");
                table.addcell("data " + i + ", 2");
                table.addcell("data " + i + ", 3");
                table.addcell("data " + i + ", 4");
                table.addcell("data " + i + ", 5");
            }

            document.add(table);

		/**
         * 如果需要更精细的控制属性
         */
        cell = new pdfpcell(new phrase("title1",fontchinese));
        cell.setcolspan(1);//设置所占列数
        cell.setrowspan(1);//合并行
        cell.sethorizontalalignment(element.align_center);//设置水平居中
        cell.setverticalalignment(element.align_middle);//设置垂直居中
        cell.setfixedheight(30);//设置高度
        table.addcell(cell);

pdfwriter writer = pdfwriter.getinstance(document, new fileoutputstream(file_dir + "createsamplepdf.pdf"));
            writer.setpageevent(new footerevent());


    public  class footerevent extends pdfpageeventhelper {
        //总页数
        pdftemplate totalpage;
        //字体
        font font;

        {
            try {
                basefont chinese = basefont.createfont("stsong-light", "unigb-ucs2-h", basefont.not_embedded);
                font = new font(chinese,10);
            } catch (documentexception | ioexception e) {
                e.printstacktrace();
            }
        }

        //打开文档时，创建一个总页数的模版
        @override

        public void onopendocument(pdfwriter writer, document document) {
            pdfcontentbyte cb = writer.getdirectcontent();
            totalpage = cb.createtemplate(50, 9);
        }

        @override
        public void onendpage(pdfwriter writer, document document) {
            //创建一个两列的表格
            pdfptable table = new pdfptable(2);
            try {
                table.settotalwidth(pagesize.a4.getwidth());//总宽度为a4纸张宽度
                table.setlockedwidth(true);//锁定列宽
                table.setwidths(new int[]{50, 50});//设置每列宽度
                pdfpcell cell = new pdfpcell(new phrase("第"+document.getpagenumber() + " 页，共", font));
                cell.sethorizontalalignment(element.align_right);//设置水平右对齐
                cell.setverticalalignment(element.align_middle);//设置垂直居中
                cell.disableborderside(15);//隐藏全部边框
                table.addcell(cell);
                pdfpcell cell1 = new pdfpcell(image.getinstance(totalpage));//共 页
                cell1.sethorizontalalignment(element.align_left);//设置水平左对齐
                cell1.setverticalalignment(element.align_middle);//设置垂直居中
                cell1.disableborderside(15);//隐藏全部边框
                table.addcell(cell1);
                table.writeselectedrows(0, -1, 0, 30, writer.getdirectcontent());
            } catch (exception e) {
                throw new exceptionconverter(e);
            }
        }
        @override
        public void onclosedocument(pdfwriter writer, document document) {
            string text = "" +string.valueof(writer.getpagenumber()) +"页";
            columntext.showtextaligned(totalpage, element.align_middle, new paragraph(text, font), 0, 0, 0);
        }
    }

pdfwriter writer = pdfwriter.getinstance(doc, out);  
  
// 设置密码为："world"  
writer.setencryption("hello".getbytes(), "world".getbytes(),  
        pdfwriter.allow_screenreaders,  
        pdfwriter.standard_encryption_128);  
  
doc.open();  
doc.add(new paragraph("hello world"));  

//图片水印
pdfreader reader = new pdfreader(file_dir + "setwatermark.pdf");  
pdfstamper stamp = new pdfstamper(reader, new fileoutputstream(file_dir  
        + "setwatermark2.pdf"));  
  
image img = image.getinstance("resource/watermark.jpg");  
img.setabsoluteposition(200, 400);  
pdfcontentbyte under = stamp.getundercontent(1);  
under.addimage(img);  
  
//文字水印  
pdfcontentbyte over = stamp.getovercontent(2);  
over.begintext();  
basefont bf = basefont.createfont(basefont.helvetica, basefont.winansi,  
        basefont.embedded);  
over.setfontandsize(bf, 18);  
over.settextmatrix(30, 30);  
over.showtextaligned(element.align_left, "duplicate", 230, 430, 45);  
over.endtext();  
  
//背景图  
image img2 = image.getinstance("resource/test.jpg");  
img2.setabsoluteposition(0, 0);  
pdfcontentbyte under2 = stamp.getundercontent(3);  
under2.addimage(img2);  
  
stamp.close();  
reader.close();  

// code 1  
document.add(new chunk("chapter 1").setlocaldestination("1"));  
  
document.newpage();  
document.add(new chunk("chapter 2").setlocaldestination("2"));  
document.add(new paragraph(new chunk("sub 2.1").setlocaldestination("2.1")));  
document.add(new paragraph(new chunk("sub 2.2").setlocaldestination("2.2")));  
  
document.newpage();  
document.add(new chunk("chapter 3").setlocaldestination("3"));  
  
// code 2  
pdfcontentbyte cb = writer.getdirectcontent();  
pdfoutline root = cb.getrootoutline();  
  
// code 3  
@suppresswarnings("unused")  
pdfoutline oline1 = new pdfoutline(root, pdfaction.gotolocalpage("1", false), "chapter 1");  
  
pdfoutline oline2 = new pdfoutline(root, pdfaction.gotolocalpage("2", false), "chapter 2");  
oline2.setopen(false);  
  
@suppresswarnings("unused")  
pdfoutline oline2_1 = new pdfoutline(oline2, pdfaction.gotolocalpage("2.1", false), "sub 2.1");  
@suppresswarnings("unused")  
pdfoutline oline2_2 = new pdfoutline(oline2, pdfaction.gotolocalpage("2.2", false), "sub 2.2");  
  
@suppresswarnings("unused")  
pdfoutline oline3 = new pdfoutline(root, pdfaction.gotolocalpage("3", false), "chapter 3"); 

pdfwriter writer = pdfwriter.getinstance(doc, new fileoutputstream(file_dir + "setheaderfooter.pdf"));  
  
writer.setpageevent(new pdfpageeventhelper() {  
  
    public void onendpage(pdfwriter writer, document document) {  
          
        pdfcontentbyte cb = writer.getdirectcontent();  
        cb.savestate();  
  
        cb.begintext();  
        basefont bf = null;  
        try {  
            bf = basefont.createfont(basefont.helvetica, basefont.winansi, basefont.embedded);  
        } catch (exception e) {  
            e.printstacktrace();  
        }  
        cb.setfontandsize(bf, 10);  
          
        //header  
        float x = document.top(-20);  
          
        //左  
        cb.showtextaligned(pdfcontentbyte.align_left,  
                           "h-left",  
                           document.left(), x, 0);  
        //中  
        cb.showtextaligned(pdfcontentbyte.align_center,  
                            writer.getpagenumber()+ " page",  
                           (document.right() + document.left())/2,  
                           x, 0);  
        //右  
        cb.showtextaligned(pdfcontentbyte.align_right,  
                           "h-right",  
                           document.right(), x, 0);  
  
        //footer  
        float y = document.bottom(-20);  
  
        //左  
        cb.showtextaligned(pdfcontentbyte.align_left,  
                           "f-left",  
                           document.left(), y, 0);  
        //中  
        cb.showtextaligned(pdfcontentbyte.align_center,  
                            writer.getpagenumber()+" page",  
                           (document.right() + document.left())/2,  
                           y, 0);  
        //右  
        cb.showtextaligned(pdfcontentbyte.align_right,  
                           "f-right",  
                           document.right(), y, 0);  
  
        cb.endtext();  
          
        cb.restorestate();  
    }  
});  
  
doc.open();  
doc.add(new paragraph("1 page"));          
doc.newpage();  
doc.add(new paragraph("2 page"));          
doc.newpage();  
doc.add(new paragraph("3 page"));          
doc.newpage();  
doc.add(new paragraph("4 page"));  

fileoutputstream out = new fileoutputstream(file_dir + "splitpdf.pdf");  
  
document document = new document();  
  
pdfwriter.getinstance(document, out);  
  
document.open();  
document.add(new paragraph("1 page"));  
  
document.newpage();  
document.add(new paragraph("2 page"));  
  
document.newpage();  
document.add(new paragraph("3 page"));  
  
document.newpage();  
document.add(new paragraph("4 page"));  
  
document.close();  
  
pdfreader reader = new pdfreader(file_dir + "splitpdf.pdf");  
  
document dd = new document();  
pdfwriter writer = pdfwriter.getinstance(dd, new fileoutputstream(file_dir + "splitpdf1.pdf"));  
dd.open();  
pdfcontentbyte cb = writer.getdirectcontent();  
dd.newpage();  
cb.addtemplate(writer.getimportedpage(reader, 1), 0, 0);  
dd.newpage();  
cb.addtemplate(writer.getimportedpage(reader, 2), 0, 0);  
dd.close();  
writer.close();  
  
document dd2 = new document();  
pdfwriter writer2 = pdfwriter.getinstance(dd2, new fileoutputstream(file_dir + "splitpdf2.pdf"));  
dd2.open();  
pdfcontentbyte cb2 = writer2.getdirectcontent();  
dd2.newpage();  
cb2.addtemplate(writer2.getimportedpage(reader, 3), 0, 0);  
dd2.newpage();  
cb2.addtemplate(writer2.getimportedpage(reader, 4), 0, 0);  
dd2.close();  
writer2.close();  

pdfreader reader1 = new pdfreader(file_dir + "splitpdf1.pdf");  
pdfreader reader2 = new pdfreader(file_dir + "splitpdf2.pdf");  
  
fileoutputstream out = new fileoutputstream(file_dir + "mergepdf.pdf");  
  
document document = new document();  
pdfwriter writer = pdfwriter.getinstance(document, out);  
  
document.open();  
pdfcontentbyte cb = writer.getdirectcontent();  
  
int totalpages = 0;  
totalpages += reader1.getnumberofpages();  
totalpages += reader2.getnumberofpages();  
  
java.util.list<pdfreader> readers = new arraylist<pdfreader>();  
readers.add(reader1);  
readers.add(reader2);  
  
int pageofcurrentreaderpdf = 0;  
iterator<pdfreader> iteratorpdfreader = readers.iterator();  
  
// loop through the pdf files and add to the output.  
while (iteratorpdfreader.hasnext()) {  
    pdfreader pdfreader = iteratorpdfreader.next();  
  
    // create a new page in the target for each source page.  
    while (pageofcurrentreaderpdf < pdfreader.getnumberofpages()) {  
        document.newpage();  
        pageofcurrentreaderpdf++;  
        pdfimportedpage page = writer.getimportedpage(pdfreader, pageofcurrentreaderpdf);  
        cb.addtemplate(page, 0, 0);  
    }  
    pageofcurrentreaderpdf = 0;  
}  
out.flush();  
document.close();  
out.close();