利用ItextPdf、core-renderer-R8 来生成PDF

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最近由于工作上的需要,需要做一个简历产品的下载功能,而下载的形式要去为PDF,内容要求为整个简历的内容,而且格式上要求和简历的格式排版时一致的!前期调研、开发,最后测试上线,差不多花了7天的时间,当然,期间主要完成了主体功能,现在的话,该功能已经相当完善。下面,我主要是总结下我在这个开发的过程中遇到的问题和总结的心得,希望能帮组有这方面需要的人。

原创文章,转载请注明出处:http://blog.csdn.net/jessonlv

前期调研

前期调研的时候,在网上看了很多关于转pdf的相关文章和技术框架,详细的我不想在此一一赘述,总体给我的感觉就是,第一:国外的相关技术框架做的就是好,关于这方面的,基本都是国外的技术,最多也就是国内牛人改改源码,来适应中文等相关的本土化需要。第二:国内有关生产pdf的需求一般都很简单,要么就是简单文本,复杂的最多也就是相关报表等,基本么有自己想要实现的那么复杂的内容、排版。尤其是生成的内容要和也也面上的内容完全一致,样式排版完全一致!

需求和思路

具体需求就是:

1、产品是一个简历产品,简历上展示的所有数据都是通过动态获取的。
2、要求内容一致,并保持样式排版一致!
首先大家可以看下我们这个产品的下载功能的应用,网址:www.mojianli.com  右上角的下载功能。 

思路    

大体思路:取出简历所有数据-->通过freemarker生成静态页面-->将html静态页面转换成PDF
这样的思路主要是保证pdf的样式要和页面样式一致。

1、首先通过相关功能接口,取出这个简历的所有数据。

2、通过freemarker排版输出的html静态页面。静态页面的样式决定了生成的pdf的样式。

3、读取html静态页面,转换成pdf。

4、将pdf输出在浏览器,实现下载功能。

开发过程

第一步:取出相关简历的所有数据

这个是和项目相关的,就不再此赘述,换成你自己想要生成的pdf内容即可。

第二步:通过freemarker生成静态页面。

首先,利用了freemarker框架,对此框架不熟悉的请自行学习,本问的重点是生成pdf,为了让大家明白此功能的应用场景,所有写了很多,但用到的pdf之外的相关技术,请大家自行学习。
freemarker模板代码:
<#assign freemarkerTool= "com.shengao.mojianli.util.FreemarkerTool"?new()>  <html><head>    <title>mojianli</title>        <style>        @font-face {            font-family: 'Microsoft YaHei';            font-family: 'Arial';        }        html, body, p {            margin: 0;            padding: 0;        }        span {            line-height: 1px;        }        body {            font-family: 'Microsoft YaHei';            font-size: 11px;            color: #666666;        }        .wrapper {            width: 900px;            margin: 0 auto;        }        .block {            margin-top: 20px;//+2        }        .align-center {            text-align: center;            margin-left: 252px;            width: 200px;        }        #name {            font-size: 25px;            margin-top: 0px;            color: #333333;            margin-bottom: 0;        }        #phone {            font-size: 12px;            margin-top: 12px;            font-family: "Arial";        }        #email {            font-size: 11px;            margin-top: 4px;            font-family: "Arial";        }        .timestamp {            display: inline-block;            width: 110px;        }        .title {            font-size: 13px;        }        .simple-module {            margin-bottom: 10px;            font-size: 11px;        }        .simple-module-item{font-size: 11px;            margin-right: 16px;}        .simple-item {            font-size: 11px;            margin-right: 16px;        }        .item_thing {            font-size: 11px;            margin-right: 6px;            line-height: 18px;        }        .label {            background: #666;            border-radius: 1px;            color: white;            font-size: 7px;            position: relative;            top: -1px;            line-height: 7px;        }        .product {            margin-left: 150px;            margin-bottom: 5px;            margin-top: 4px;            width:750px;        }        .capacity-block {            margin-left: 22px;        }        .things {            padding-left: 12px;            margin-top: 5px;            background: url(img/dot.png) left top no-repeat;        }        .tag {            background: #333333;            border-radius: 1px;            color: white;            font-size: 11px;            padding: 0 1px 1px 1px;   margin-right: 4px;   border-radius: 1px;            }        .enterprise{        margin-bottom: 9px;        }.enterprise .simple-item {  margin-bottom: 5px;}.capacity-group {  margin-top: 5px;  width: 520px;}        .paragraph {            line-height: 16px;            font-size: 11px;            margin-bottom: 10px;            width: 700px;        }        .h-seperator {            border-color: #666;            margin-top: 7px;            height: 0;            border-top: none;            border-bottom: 1px solid;            margin-bottom: 6px;        }        .company,.department,.title{        color: #333;        }    </style></head><body><#escape x as x!""></#escape><div class="wrapper">    <div class="block align-center" id="contact">        <p id="name">${name}</p>        <p id="phone">${phone}</p>        <p id="email">${email}</p>    </div>    <div class="block" id="education">        <span class="title">${exp}</span>        <div class="h-seperator"></div>    <#list education as education>    <p class="simple-module">        <span class="timestamp simple-module-item">${education.start_date} ~ ${education.end_date}</span>    <span class="simple-module-item"><#if education.university??>${education.university}</#if></span>    <span class="simple-module-item"><#if education.colleges??>${education.colleges}</#if> · <#if education.major??>${education.major}</#if></span>        <span class="simple-module-item"><#if education.degree??>${education.degree}</#if></span>            <span class="simple-module-item"><#if education.explain??>${education.explain}</#if></span>                </p>    </#list>    </div>    <!--under-->    <!--割一割-->    <div class="block" id="experience">        <span class="title">${project}</span>        <div class="h-seperator"></div>        <!--项目模板代码开始-->        <!--项目经历开始-->    <#list experience as experiences>        <div class="enterprise">            <span class="timestamp simple-item">${experiences.experience.start_date} ~ ${experiences.experience.end_date}</span>            <span class="simple-item company">${experiences.experience.company}</span>            <span class="simple-item department">${experiences.experience.department}</span>            <span class="simple-item title">${experiences.experience.title}</span>            <!--项目名称开始-->            <#list experiences.projects as projects>                <div class="product">                    <span class="simple-item">${projects.project.name}</span>                    <span class="simple-item">${projects.project.phase}</span>                    <span class="simple-item">${projects.project.core_goal}</span>                    <!--标签、事情开始-->                    <#list projects.tags as tags>                        <div class="capacity-block">                            <div class="capacity-group">                                <!--标签开始-->                                <#list tags.tags as tag>                                    <span class="tag">${tag.base_tag_name}</span>                                </#list>                                <!--标签结束-->                                <!--事情开始-->                                <#list tags.items as item>                                    <div class="things">                                        <#list item.labels as label>                                            <span class="label">${label.base_label_name}</span>                                            <span class="item_thing">${label.content}</span>                                        </#list>                                    </div>                                </#list>                                <!--事情结束-->                            </div>                        </div>                    </#list>                    <!--标签、事情结束-->                </div>            </#list>            <!--项目名称结束-->        </div>    </#list>        <!--项目名称结束-->        <!--项目模板代码结束-->    </div>    <!--割一割-->    <div class="block" id="honor">        <span class="title">${awards}</span>        <div class="h-seperator"></div>    <#list awardses as awardses>        <p class="simple-module">            <span class="simple-item timestamp">${awardses.start_date} ~ ${awardses.end_date}</span>            <span class="simple-item"><#if awardses.name??>${awardses.name}</#if></span>            <span class="simple-item"><#if awardses.level??>${awardses.level}</#if></span>            <span class="simple-item"><#if awardses.rank??>${awardses.rank}</#if></span>            <span class="simple-item"><#if awardses.number??>${awardses.number}</#if></span>        </p>    </#list>    </div>    <div class="block" id="evaluation">        <span class="title">${evaluate}</span>        <div class="h-seperator"></div>    <#list evaluates as evaluates>        <p class="paragraph">${freemarkerTool(evaluates.content)}</p>    </#list>    </div></div></body></html>

模板相关的数据填充,调用java方法的做法等,网上很多,我也是现学现用的。
利用此模板生成的静态页面的样式,就是你想要的pdf的样式。

然后是读取此模板,生成html页面的代码:
@RequestMapping(value = "/createPdf.s", method = {RequestMethod.POST,RequestMethod.GET})    public void getAllResumeInfoById(HttpServletRequest request, HttpServletResponse response,                                    @RequestParam(value="id", required = true) Long id) {        String perName = "";     String positionName = "";    long resumeId = id;    //获取所有的数据    //个人基本信息    ResumeInfoBean resumeInfo = new ResumeInfoBean();    //教育经历    List<EducationBean> eduList =  new ArrayList<EducationBean>();    //获奖经历    List<AwardsBean> awardsList = new ArrayList<AwardsBean>();    //个人评价    List<EvaluateBean> evaList = new ArrayList<EvaluateBean>();    //项目经历    List<PdfExperience> pdfExperience = new ArrayList<PdfExperience>();    try {        Map<String, Object> map = resumeInfoService.getAllResumeInfoById(id);                resumeInfo = (ResumeInfoBean)map.get("resumeInfo");        eduList = (List<EducationBean>)map.get("education");        awardsList = (List<AwardsBean>)map.get("awards");        evaList = (List<EvaluateBean>)map.get("evaluates");        pdfExperience = (List<PdfExperience>)map.get("experiences");                System.out.println("finish...pdfExperience.size=="+pdfExperience.size());        } catch (Exception e) {            log.warn(e);            JsonUtil.errorToClient(response, 400, e.getMessage());            return;        }    //工程路径        String path = request.getSession().getServletContext().getRealPath("/");    try {            Configuration cfg = new Configuration();            cfg.setDirectoryForTemplateLoading(new File(getPath(request,response)));            cfg.setObjectWrapper(new DefaultObjectWrapper());            cfg.setDefaultEncoding("UTF-8");   //这个一定要设置,不然在生成的页面中会乱码            //设置对象包装器            cfg.setObjectWrapper(new DefaultObjectWrapper());            //设计异常处理器            cfg.setTemplateExceptionHandler(TemplateExceptionHandler.IGNORE_HANDLER);            //准备魔简历数据            Map<String, Object> ResumeMap = new HashMap<String, Object>();            //头部信息bean对象            String name = resumeInfo.getName();            perName = name;            positionName = resumeInfo.getBase_position_name();            String phone = resumeInfo.getMobile();            String email = resumeInfo.getEmail();            ResumeMap.put("name",name);            ResumeMap.put("phone",phone);            ResumeMap.put("email",email);            //定义四个模块标题            ResumeMap.put("exp","教育经历");            ResumeMap.put("project","项目经历");            ResumeMap.put("awards","获奖经历");            ResumeMap.put("evaluate","个人评价");            //封装教育经历对象数据            ResumeMap.put("education", eduList);            String streducationlist = JsonUtil.list2json(eduList);                        //封装项目经历数据            ResumeMap.put("experience", pdfExperience);            String strEx= JsonUtil.list2json(pdfExperience);            System.out.print(strEx);            //封装获奖经历数据            ResumeMap.put("awardses",awardsList);            String strawardsList = JsonUtil.list2json(awardsList);            //封装个人评价数据            ResumeMap.put("evaluates",evaList);            String strevaList = JsonUtil.list2json(evaList);            //获取指定模板文件            Template template = cfg.getTemplate("mojianli.ftl");            //控制台打印            template.process(ResumeMap, new PrintWriter(System.out));            //定义输入文件,默认生成在工程根目录            String s = getPath(request,response);        path = s+id+"_mojianli.html";            Writer out = new OutputStreamWriter(new FileOutputStream(path),"UTF-8");            //最后开始生成            template.process(ResumeMap, out);            System.out.println("create the html successful!!!"+"path="+request.getSession().getServletContext().getRealPath("/"));        }catch (Exception e){            e.printStackTrace();            jsonObjOutPut.clear();            jsonObjOutPut = JsonUtil.createJsonObject(MSG.STATUS_RESPONSE_FAIL_201, MSG.MSG_RESPONSE_FAIL_201);            stringOutPutData = JsonUtil.object2json(jsonObjOutPut);            JsonUtil.jsonStringToClient(response,stringOutPutData);        }        boolean boo = false;        try {            boo =  html2Pdf(request,response,perName,resumeId,positionName);        }catch (Exception e){            e.printStackTrace();            jsonObjOutPut.clear();            jsonObjOutPut = JsonUtil.createJsonObject(MSG.STATUS_RESPONSE_FAIL_201, MSG.MSG_RESPONSE_FAIL_201);            stringOutPutData = JsonUtil.object2json(jsonObjOutPut);            JsonUtil.jsonStringToClient(response,stringOutPutData);        } }

前半段关于数据的封装等的代码可以不管,填上自己的数据就行了。

生成页面有就是读取相关页面,并生成pdf的代码

//html转成pdf    private boolean html2Pdf(HttpServletRequest request,HttpServletResponse response,String name,long id,String postionName) throws  IOException, DocumentException, ParserConfigurationException {    boolean bl = false;    //工程路径    /*String separator = File.separator;String root = request.getSession().getServletContext().getRealPath("");    String path = root+separator+"WEB-INF"+separator+"resources"+name+"_"+id+"_mojianli.html";*/    String path = getPath(request,response)+id+"_mojianli.html";    //获取已经生成的html页面的路径    //String path = "F:\\tomcat_myeclipse\\webapps\\mojianli\\WEB-INF\\resources\\mojianli.html";    //读取html    FileInputStream fis =new FileInputStream(path);    StringWriter writers = new StringWriter();    InputStreamReader isr = null;    String string = null;    //此处将io流转换成String    try {        isr = new InputStreamReader(fis,"utf-8");//包装基础输入流且指定编码方式        //将输入流写入输出流        char[] buffer = new char[2048];        int n = 0;        while (-1 != (n = isr.read(buffer))) {            writers.write(buffer, 0, n);        }    }catch (Exception e){        e.printStackTrace();    } finally {        if (isr != null)            try {                isr.close();            } catch (IOException e) {                e.printStackTrace();                jsonObjOutPut.clear();                jsonObjOutPut = JsonUtil.createJsonObject(MSG.STATUS_RESPONSE_FAIL_201, MSG.MSG_RESPONSE_FAIL_201);                stringOutPutData = JsonUtil.object2json(jsonObjOutPut);                JsonUtil.jsonStringToClient(response,stringOutPutData);            }    }    if (writers!=null){        string = writers.toString();    }    System.out.print(string);    //利用renderer来准备数据    ITextRenderer renderer = new ITextRenderer();    ITextFontResolver fontResolver = renderer.getFontResolver();    //设置创建PDF的时候要用的字体,此字体必须要和简历模板的字体保持一致!!    fontResolver.addFont(getPath(request, response)+"msyh.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);    fontResolver.addFont(getPath(request, response)+"arial.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);    //get font family name    BaseFont font = null;    BaseFont font2 = null;    try {        font = BaseFont.createFont(getPath(request, response)+"msyh.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);        font2 = BaseFont.createFont(getPath(request, response)+"arial.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);    } catch (DocumentException e) {        e.printStackTrace();        jsonObjOutPut.clear();        jsonObjOutPut = JsonUtil.createJsonObject(MSG.STATUS_RESPONSE_FAIL_201, MSG.MSG_RESPONSE_FAIL_201);        stringOutPutData = JsonUtil.object2json(jsonObjOutPut);        JsonUtil.jsonStringToClient(response,stringOutPutData);    }    //fontFamilyName‘s  value is the key for font-family    String fontFamilyName = TrueTypeUtil.getFamilyName(font2);    System.out.println("fontFamilyName222="+fontFamilyName);    //设置pdf内容!!    renderer.setDocumentFromString(string);    //设置图片的绝对路径    renderer.getSharedContext().setBaseURL("file:"+getPath(request,response)+"\\img");    System.out.println(getPath(request,response)+"img");    renderer.layout();    //create the pdf        //String pdfPath = path+"WEB-INF\\resources\\"+name+"_mojianli.pdf";    String pdfPath = getPath(request, response)+id+"_mojianli.pdf";    FileOutputStream outputStream = new FileOutputStream(pdfPath);//文件输出根目录下    renderer.createPDF(outputStream);      //Finishing up    //renderer.finishPDF();    System.out.println("created the pdf !!");    //下载    try{    //downloadPdf(response,request,name,outputStream);    downLoadPdf(request,response,name,id,postionName);    }catch (Exception e ){    e.printStackTrace();    }        bl = true;    return  bl;    }

这里需要注意的两点是:1、设置中文字体,以及中文字体文件的引用2、引用图片的问题。 仔细看代码注释,上面都有!

生成pdf以后,就是推送到浏览器的问题:
public void downLoadPdf(HttpServletRequest request, HttpServletResponse response,String name,long id,String postionName) {        try {                String separator = File.separator;                String root = request.getSession().getServletContext().getRealPath("");                String filePath = root+separator+"WEB-INF"+separator+"resources";        String headerName = new String(name.getBytes("utf-8"),"iso8859_1");//解决下载文件中文标题乱码问题        String postion = new String(postionName.getBytes("utf-8"),"iso8859_1");response.setCharacterEncoding("UTF-8");response.setContentType("application/pdf");response.setHeader("Content-Disposition", "attachment; filename="+headerName+"-"+postion+".pdf");OutputStream outputStream = response.getOutputStream();InputStream inputStream = new FileInputStream(filePath + separator+id+"_mojianli.pdf");byte[] buffer = new byte[1024];int i = -1;while ((i = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, i);}outputStream.flush();//outputStream.close();inputStream.close();        } catch (Exception e) {        e.printStackTrace();            log.warn(e);            JsonUtil.errorToClient(response, 400, e.getMessage());            return;        }    }
这里的注意点是:注意下载文件中文标题乱码问题

至此,以上总体的代码大概是这样,需要的人,可以多看看,如果有什么问题,欢迎随时私信、留言等交流。
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