企业网站建设的常见流程,电子商务教材电子版,网站多域名怎么做,重庆沙坪坝企业网站建设联系电话我一直提倡的面向接口和约定编程#xff0c;而打印元素绘制协议一直是我推荐的打印实现方式#xff0c;我以前只是强调按打印元素绘制协议输出数据就行了#xff0c;有实现程序按协议控制打印#xff0c;说是可以用任何语言实现客户端程序而不影响打印业务#xff0c;那么…我一直提倡的面向接口和约定编程而打印元素绘制协议一直是我推荐的打印实现方式我以前只是强调按打印元素绘制协议输出数据就行了有实现程序按协议控制打印说是可以用任何语言实现客户端程序而不影响打印业务那么这次就用Java实现打印元素绘制协议来感受一下按协议编程的魅力吧。
打印设计请参照打印设计
首先以前的M都由虚拟M层替代了这个就是访问地址
然后实现Java调用虚拟M逻辑客户端通过此逻辑调虚拟M拿到符合打印元素绘制协议的数据
package JRTPrintDraw.WebService;import javax.net.ssl.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.SAXParserFactory;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.security.cert.X509Certificate;
import java.util.HashMap;import JRTPrintDraw.WebService.Parameters;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;/*** 请求Webservice得到数据*/
public class WebGetData {/*** 调用虚拟M方法得到数据** param Address 地址* param ClassName 类名* param FuncName 方法名* param Param 参数* param Session 会话* return* throws Exception*/public static String GetData(String Address, String ClassName, String FuncName, Parameters Param, String Session) throws Exception {System.out.println(ClassName: ClassName);System.out.println(FuncName: FuncName);String result ;DealNullPara(Param);String paraStr MethodGetDataClassName ClassName FuncName FuncName Param URLEncoder.encode(JRTPrintDraw.JsonDealUtil.Object2Json(Param), UTF-8) Session URLEncoder.encode(Session, UTF-8);try {//返回接受的数据result GetHttpStr(Address, paraStr);//调用报错了if (!result.contains(Response)) {result ResponseSQLResultSQLFunRet/FunRet/SQL/SQLResultRetVal-1/RetValError result /ErrorNode/NodeRowCount0/RowCount/Response;}} catch (Exception ex) {result ,异常信息: ex.getMessage() ,调用: ClassName , FuncName , Param , Session;}return DealXmlToJson(result);}/*** 把xml处理成json串** param xmlStr* return* throws Exception*/private static String DealXmlToJson(String xmlStr) throws Exception {System.out.println(返回串: xmlStr);DocumentBuilderFactory factory DocumentBuilderFactory.newInstance();DocumentBuilder builder factory.newDocumentBuilder();Document document builder.parse(new InputSource(new StringReader(xmlStr)));// 获得根节点Element rootElement document.getDocumentElement();// 获得根节点下的所有子节点NodeList childs rootElement.getChildNodes();HashMap dataMap new HashMap();String ResultName ;for (int i 0; i childs.getLength(); i) {// 由于节点多种类型而一般我们需要处理的是元素节点Node childNode childs.item(i);// 元素节点就是非空的子节点也就是还有孩子的子节点if (childNode.getNodeType() Node.ELEMENT_NODE) {Element childElement (Element) childNode;dataMap.put(childElement.getNodeName(), childElement.getTextContent());//不是对象配置元素就忽略if (childElement.getNodeName().equals(Node)) {ResultName childElement.getTextContent() Result;}}}String Error dataMap.get(Error).toString();if (!Error.isEmpty()) {System.out.println(异常: Error);throw new Exception(Error);}String ResType dataMap.get(ResType).toString();System.out.println(数据串: dataMap.get(ResultName).toString());return dataMap.get(ResultName).toString();}/// summary/// 处理空参数/// /summary/// param nameParam/paramprivate static void DealNullPara(Parameters Param) {if (Param.P0 null) {Param.P0 ;}if (Param.P1 null) {Param.P1 ;}if (Param.P2 null) {Param.P2 ;}if (Param.P3 null) {Param.P3 ;}if (Param.P4 null) {Param.P4 ;}if (Param.P5 null) {Param.P5 ;}if (Param.P6 null) {Param.P6 ;}if (Param.P7 null) {Param.P7 ;}if (Param.P8 null) {Param.P8 ;}if (Param.P9 null) {Param.P9 ;}if (Param.P10 null) {Param.P10 ;}if (Param.P11 null) {Param.P11 ;}if (Param.P12 null) {Param.P12 ;}if (Param.P13 null) {Param.P13 ;}if (Param.P14 null) {Param.P14 ;}}/*** 从http下载文本** param url url* param para 参数* return 文本串* throws Exception*/private static String GetHttpStr(String url, String para) throws Exception {byte[] bytes para.getBytes(UTF-8);//忽略证书if (url.contains(https://)) {TrustManager[] trustAllCerts new TrustManager[]{new X509TrustManager() {public java.security.cert.X509Certificate[] getAcceptedIssuers() {return null;}public void checkClientTrusted(X509Certificate[] certs, String authType) {}public void checkServerTrusted(X509Certificate[] certs, String authType) {}}};// Install the all-trusting trust managerSSLContext sc SSLContext.getInstance(SSL);sc.init(null, trustAllCerts, new java.security.SecureRandom());HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());// Create all-trusting host name verifierHostnameVerifier allHostsValid new HostnameVerifier() {public boolean verify(String hostname, SSLSession session) {return true;}};}URL u new URL(url);HttpURLConnection http (HttpURLConnection) u.openConnection();http.setAllowUserInteraction(true);http.setDoOutput(Boolean.TRUE);http.setDoInput(Boolean.TRUE);http.setUseCaches(false);http.setRequestProperty(Content-type, application/x-www-form-urlencoded);http.setInstanceFollowRedirects(false);http.setRequestMethod(POST);http.connect();OutputStream outputStream http.getOutputStream();outputStream.write(bytes);outputStream.flush();outputStream.close();InputStream is http.getInputStream();BufferedReader reader new BufferedReader(new InputStreamReader(is));StringBuilder stringBuilder new StringBuilder();String line null;while ((line reader.readLine()) ! null) {stringBuilder.append(line System.lineSeparator());}return stringBuilder.toString();}
}
然后实现打印元素绘制协议这里把打印和绘图逻辑进行了分离因为绘图逻辑后面还会给网站的在线打印预览用 按元素类型绘制 绘图与打印结合
package Monitor.Print;import JRTPrintDraw.DrawConvert;
import JRTPrintDraw.DrawElement;
import JRTPrintDraw.JRTPrintDrawProtocol;
import JRTPrintDraw.JsonDealUtil;
import JRTPrintDraw.WebService.Parameters;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;import javax.print.DocFlavor;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.standard.Media;
import javax.print.attribute.standard.MediaSizeName;
import javax.print.attribute.standard.MediaTray;
import java.awt.*;
import java.awt.print.*;
import java.util.ArrayList;
import java.util.List;public class PrintProtocol implements Printable {/*** 纸张名称*/private String PageName;/*** 打印句柄*/private JRTPrintDrawProtocol printHandelernull;/*** 得到打印机* param printerName* return*/public static PrintService GetPrinter(String printerName) {DocFlavor psInFormat DocFlavor.INPUT_STREAM.AUTOSENSE;HashPrintRequestAttributeSet pras new HashPrintRequestAttributeSet();PrintService printService[] PrintServiceLookup.lookupPrintServices(psInFormat, pras);PrintService myPrinter null;//遍历所有打印机如果没有选择打印机或找不到该打印机则调用默认打印机for (PrintService printService2 : printService) {String svcName printService2.toString();if (svcName.contains(printerName)) {myPrinter printService2;break;}}if (myPrinter null) {myPrinter PrintServiceLookup.lookupDefaultPrintService();return myPrinter;}return myPrinter;}/*** 按打印元素绘制协议实现打印* param rowids 数据主键* param userCode 用户* param paramList 参数* param connectString 连接串* param printFlag 打印标识* param className 调用类名* param funcName 方法名称*/public PrintProtocol(String rowids, String userCode, String paramList, String connectString, String printFlag, String className, String funcName) throws Exception{try {Parameters paranew Parameters();para.P0rowids;para.P1userCode;para.P2paramList;para.P3rowids;String jsonJRTPrintDraw.WebService.WebGetData.GetData(connectString,className,funcName,para,);System.out.println(打印数据:json);ListDrawElement elementList JsonDealUtil.Json2List(json,new DrawElement());System.out.println(转换List);// 通俗理解就是书、文档Book book new Book();printHandelernew JRTPrintDrawProtocol();int pageNumprintHandeler.JRTPrintDrawInit(elementList);System.out.println(页数:pageNum);// 获取打印服务对象PrinterJob job PrinterJob.getPrinterJob();// 设置打印类job.setPageable(book);//设置成竖打PageFormat pf new PageFormat();pf.setOrientation(PageFormat.PORTRAIT);boolean hasSetPaperfalse;//控制打印机的数据if(elementList.get(0).PrintType.contains(PRINTER)){DrawElement drelementList.get(0);//打印机名称String tPrinterName elementList.get(0).PrintFlag;//选择打印机if(tPrinterName!null!tPrinterName.isEmpty()){PrintService printServiceGetPrinter(tPrinterName);job.setPrintService(printService);}//设置打印机其他参数if(dr.PrintType.equals(PRINTER)){//设置打印机宽度int PrinterWidth DrawConvert.ToInt32(dr.PrintWidth);//设置打印机高度int PrinterHeight DrawConvert.ToInt32(dr.PrintHeight);printHandeler.WriteLog(PRINTER得到纸张宽高 PrinterWidth PrinterHeight);//页面名称PageName dr.DataField;//停靠String ReportLayout dr.PrintAlignment;printHandeler.WriteLog(PRINTER得打印机名称 tPrinterName);//指定打印机送纸来源int iPaperSource DrawConvert.ToInt32(dr.PrintFont);if (ReportLayout Landscape){pf.setOrientation(PageFormat.LANDSCAPE);printHandeler.WriteLog(PRINTER旋转纸张Landscape);}//宽高大于0就控制if(PrinterWidth0PrinterHeight0){//通过Paper设置页面的空白边距和可打印区域。必须与实际打印纸张大小相符。Paper paper new Paper();// 设置纸张大小为 A4 大小210 mm × 297 mmint width PrinterWidth;int height PrinterHeight;//旋转if (ReportLayout Landscape) {int tmpwidth;widthheight;heighttmp;}double margin 0;paper.setSize(width, height);paper.setImageableArea(margin, margin, width - 2 * margin, height - 2 * margin);pf.setPaper(paper);hasSetPapertrue;}}}if(hasSetPaperfalse){Paper paper new Paper();// 设置纸张大小为 A4 大小210 mm × 297 mmint width 794;int height 1123;double margin 0;paper.setSize(width, height);paper.setImageableArea(margin, margin, width - 2 * margin, height - 2 * margin);pf.setPaper(paper);}book.append(this, pf,pageNum);if(printFlag.contains(PrintPreview)){System.out.println(打印设置);job.print();}else{System.out.println(打印);job.print();}}catch (PrinterException e) {e.printStackTrace();}}/*** 画图* param graphics* param pageFormat* param pageIndex* return* throws PrinterException*/Overridepublic int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {// 转换成Graphics2D 拿到画笔Graphics2D g2 (Graphics2D) graphics;if(printHandeler!null){try {int drawOneRetprintHandeler.DrawOnePage(g2, pageIndex);System.out.println(pageIndex:drawOneRet);return drawOneRet;}catch (Exception ex){if(ex.getCause()!null){printHandeler.WriteLog(ex.getCause().getMessage());}else{printHandeler.WriteLog(ex.getMessage());}ex.printStackTrace();return 1;}}return 1;}
}
这样就实现了Java的打印层只要按打印元素绘制协议打印的业务不需要改就能话环境执行了
C#的效果
Java的效果
打磨好之后再把导出Excel实现了就基本实现JRT的最终目标了导出一样的实现的有导出协议我一般不直接写死业务到时候开发换Linux都没毛病了实现可以用任何语言都行为啥打印也有Java呢因为成本不可能客户端程序再用一套编程语言实现增加维护和开发成本虽然写的比C#丑陋很多也得忍着把实现了
