Websocket客户端交互及服务端信息推送

package com.example.demo.utils; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.net.MalformedURLException; import java.util.ArrayList; import java.util.Iterator; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import com.itextpdf.text.*; import com.itextpdf.text.pdf.BaseFont; import com.itextpdf.text.pdf.ColumnText; import com.itextpdf.text.pdf.PdfAnnotation; import com.itextpdf.text.pdf.PdfContentByte; import com.itextpdf.text.pdf.PdfImportedPage; import com.itextpdf.text.pdf.PdfPTable; import com.itextpdf.text.pdf.PdfPageEventHelper; import com.itextpdf.text.pdf.PdfReader; import com.itextpdf.text.pdf.PdfStamper; import com.itextpdf.text.pdf.PdfTransition; import com.itextpdf.text.pdf.PdfWriter; import com.itextpdf.text.pdf.draw.DottedLineSeparator; import com.itextpdf.text.pdf.draw.LineSeparator; import com.itextpdf.text.pdf.draw.VerticalPositionMark; public class PDFUtils { public static final String FILE_DIR = "E:\\home\\"; public static final String const_JPG_JAVA = FILE_DIR + "danren.jpg"; public static final String const_JPG_NGINX = FILE_DIR + "hongse.jpg"; private static final String const_NEZHA = "哪吒编程"; private static final String const_NEZHA_PROGRAM = "获取Java学习资料请关注公众号：哪吒编程"; private static final String const_BIBIDONG = "比比东"; private static final String const_YUNYUN = "云韵"; private static final String const_BAIDU = "百度一下 你就知道"; private static final String const_BAIDU_URL = "https://www.baidu.com"; private static final String const_PAGE_FIRST = "第一页"; private static final String const_PAGE_SECOND = "第二页"; private static final String const_PAGE_THIRD = "第三页"; private static final String const_PAGE_FOUR = "第四页"; private static final String const_PAGE_FIVE = "第五页"; private static final String const_TITLE_FIRST = "一级标题"; private static final String const_TITLE_SECOND = "二级标题"; private static final String const_CONTENT = "内容"; // 普通中文字体 public static Font static_FONT_CHINESE = null; // 超链字体 public static Font static_FONT_LINK = null; private static void pdfFontInit() throws IOException, DocumentException { // 微软雅黑 BaseFont chinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); // 普通中文字体 static_FONT_CHINESE = new Font(chinese, 12, Font.NORMAL);// Font.BOLD为加粗 // 超链字体 static_FONT_LINK = new Font(chinese, 12, Font.NORMAL, BaseColor.BLUE); } public static Document document; public void createPDFFile() throws Exception { pdfFontInit(); //createPDF();// 生成一个 PDF 文件 ///createPDFWithColor();// 设置PDF的页面大小和背景颜色 //createPDFWithPassWord();// 创建带密码的PDF //createPDFWithNewPages();// 为PDF添加页 //createPDFWithWaterMark();// 为PDF文件添加水印，背景图 //createPDFWithContent();//插入块Chunk, 内容Phrase, 段落Paragraph, List //createPDFWithExtraContent();//插入Anchor, Image, Chapter, Section draw();//画图 createPDFWithAlignment();//设置段落 //createPDFToDeletePage();//删除 page //insertPage();// 插入 page //splitPDF();//分割 page //mergePDF();// 合并 PDF 文件 //sortpage();// 排序page //setHeaderFooter();// 页眉，页脚 //addColumnText();// 左右文字 //setView();// 文档视图 //pdfToZip();// 压缩PDF到Zip //addAnnotation();// 注释 } /** * 创建一个 PDF 文件，并添加文本 */ public static void createPDF() throws IOException, DocumentException { // 实例化 document document = new Document(); // 生成文件 String path = FILE_DIR + "createPDF.pdf"; File file = new File(path); if(!file.exists()){ file.createNewFile(); } PdfWriter.getInstance(document, new FileOutputStream(FILE_DIR + "createPDF.pdf")); // 打开 document document.open(); // 添加文本 此处无法写入中文 TODO document.add(new Paragraph(const_NEZHA)); document.add(new Paragraph("什么情况，我这是第一个PDF文件！", static_FONT_CHINESE)); document.add(new Paragraph(const_NEZHA, static_FONT_CHINESE)); // 关闭 document document.close(); } /** * 创建PDF文件，修改文件的属性 */ public static void createPDFWithColor() throws FileNotFoundException, DocumentException { // 页面大小 PageSize.A5.rotate() Rectangle rect = new Rectangle(PageSize.A4.rotate()); // 页面背景色 rect.setBackgroundColor(BaseColor.YELLOW); document = new Document(rect); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(FILE_DIR + "createPDFWithColor.pdf")); // PDF版本(默认1.4) writer.setPdfVersion(PdfWriter.VERSION_1_6); // 文档属性 document.addAuthor(const_NEZHA); document.addTitle("我的第一个pdf"); // 页边空白 document.setMargins(10, 10, 10, 10); // 打开 document.open(); document.add(new Paragraph("重新打开文件并进行填写信息！", static_FONT_CHINESE)); // 关闭 document.close(); } /** * 创建带密码的PDF */ public static void createPDFWithPassWord() throws FileNotFoundException, DocumentException { // 页面大小 Rectangle rect = new Rectangle(PageSize.A5.rotate()); // 页面背景色 rect.setBackgroundColor(BaseColor.YELLOW); document = new Document(rect); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(FILE_DIR + "createPDFWithPassWord.pdf")); // userPassword打开密码："123" // ownerPassword编辑密码: "123456" writer.setEncryption("123".getBytes(), "123456".getBytes(), PdfWriter.ALLOW_SCREENREADERS, PdfWriter.STANDARD_ENCRYPTION_128); document.open(); document.add(new Paragraph(const_NEZHA, static_FONT_CHINESE)); document.close(); } /** * 为PDF添加页 */ public static void createPDFWithNewPages() throws FileNotFoundException, DocumentException { document = new Document(); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(FILE_DIR + "createPDFAddNewPages.pdf")); document.open(); document.add(new Paragraph(const_PAGE_FIRST, static_FONT_CHINESE)); document.newPage(); document.add(new Paragraph(const_PAGE_SECOND, static_FONT_CHINESE)); writer.setPageEmpty(true); document.newPage(); document.add(new Paragraph(const_PAGE_THIRD, static_FONT_CHINESE)); document.close(); } /** * 为PDF文件添加水印，背景图 */ public static void createPDFWithWaterMark() throws IOException, DocumentException { FileOutputStream out = new FileOutputStream(FILE_DIR + "createPDFWithWaterMark.pdf"); document = new Document(); PdfWriter.getInstance(document, out); document.open(); document.add(new Paragraph(const_PAGE_FIRST, static_FONT_CHINESE)); document.newPage(); document.add(new Paragraph(const_PAGE_SECOND, static_FONT_CHINESE)); document.newPage(); document.add(new Paragraph(const_PAGE_THIRD, static_FONT_CH