SpringBoot pdf打印及预览(openhtmltopdf+freemarker)

SpringBoot pdf打印及预览(openhtmltopdf+freemarker)

1. 添加依赖

openhtmltopdf+freemarker

  
        1.0.10
    

   
        
            
            com.openhtmltopdf
            openhtmltopdf-core
            ${openhtml.version}
        
        
            
            com.openhtmltopdf
            openhtmltopdf-pdfbox
            ${openhtml.version}
        
        
            
            com.openhtmltopdf
            openhtmltopdf-slf4j
            ${openhtml.version}
        
        
            org.springframework.boot
            spring-boot-starter-freemarker
        
  

1. 在/resources/template/view/html新建模板xxx.ftl文件

    
    
    /* 特有css样式自行参考官网 */
        @page {
            size: a4;
            @top-left {
                content: element(header-left);
            }
            @top-center {
                content: element(header-center);
            }
            @top-right {
                content: element(header-right);
            }
            @bottom-center {
                font-size: 14px;
                content: counter(page);
                font-family: 'simsun', serif;
            }
            margin: 50px;
        }

        * {
            margin: 0;
            padding: 0;
            font-family: 'simsun', serif;
        }

        #page-header-left {
            font-size: 10px;
            font-weight: bold;
            position: running(header-left);
        }

        #page-header-center {
            font-size: 10px;
            font-weight: bold;
            position: running(header-center);
        }

        #page-header-right {
            font-size: 10px;
            font-weight: bold;
            position: running(header-right);
        }

        table {
            width: 100%;
            font-size: 14px;
            border-collapse: collapse;
            font-family: 'simsun', serif;
            border-spacing: 0;
            /* The magical table pagination property. */
            /*-fs-table-paginate: paginate;*/
            /* Recommended to avoid leaving thead on a page by itself. */
            -fs-page-break-min-height: 0.5cm;
            border-left: 0.07cm solid black;
            border-right: 0.07cm solid black;
            border-bottom: 0.03cm solid black;
        }

        .checkbox {
            display: inline-block;
            position: relative;
            top: 1px;
            width: 10px;
            height: 10px;
            border: 1px solid black;

        }

        .correct {
            display: inline-block;
            position: relative;
            top: 2px;
            right: 15px;
            width: 7px;
            height: 3px;
            border-left: 1px solid black;
            border-bottom: 1px solid black;
            -webkit-transform: rotate(-45deg);
            transform: rotate(-45deg);
            margin-right: -16px;
        }

        input[type = "checkbox"] {
            width: 10px;
            height: 10px;
            border: 1px solid black;
        }

        tr, thead, tfoot {
            page-break-inside: avoid;
        }

        td, th {
            page-break-inside: avoid;
            font-family: 'simsun', serif;
            padding: 1px;
            border-top: 0.03cm solid black;
            border-left: 0.03cm solid black;
        }


        td:first-child, th:first-child {
            border-left: 0;
        }

        #table-title {
            text-align: center;
            margin-top: 0;
            margin-bottom: 5px;
            font-weight: bold;
        }  
       
    



    

        编号：${code!''}
    
    

    时间 1)：${time?date!''}
    


    

        

            
标题1
            
${xx1!''}
            
标题2
            
${xx2!''}
            
标题3
            
${xx3!''}
        
         

            
结果
            

                

                    

                    
                        

                    #if>
                    
合格
                    

                    
                        

                    #if>
                    
不合格
                
            
            
签字人：
        
    

1. controller接口

   @RequestMapping(value = "/print/pdf/{code}", produces = MediaType.APPLICATION_PDF_VALUE)
    public ResponseEntity printPdf(@PathVariable("code") String detectCode) throws IOException, TemplateException {
        Assert.hasText(code, "code不能为空");
        return detectReportPrintService.findPdf(code);
    }

1. service实现类

📌pdf预览有中文乱码，需要重新引入simsun.ttf字体文件，放在/resources/fonts文件夹下（与代码路径一致即可），ftl文件中css样式必须font-family: ‘simsun’, serif;

📌在 Configuration 中可以使用下面的方法来方便建立三种模板加载。 (每种方法都会在其内部新建一个模板加载器对象，然后创建 Configuration 实例来使用它。)
1. void setDirectoryForTemplateLoading(File dir);
2. void setClassForTemplateLoading(Class cl, String prefix);
3. void setServletContextForTemplateLoading(Object servletContext, String path);
项目打包为jar包只能使用setClassForTemplateLoading方法。

    public ResponseEntity findPdf(String code) throws IOException, TemplateException {
        //获取ftl所需变量值的自定义方法
        Map data = this.findValue(code);
        //FreeMarker 生成 html字符串
        Configuration conf = new Configuration(Configuration.VERSION_2_3_23);
        conf.setDefaultEncoding("UTF-8");
        //加载模板文件(模板的路径)
        //有多种加载模板的方法
        //项目打包为jar包只能使用setClassForTemplateLoading方法
        //第一个参数：springboot启动类，第二个参数：ftl模板对应resources下的位置
        conf.setClassForTemplateLoading(XaWebApplication.class, "/template/view/html");
        // 加载模板
        Template template = conf.getTemplate("/xxx.ftl");
        //传入变量生成html字符串
        String htmlString = FreeMarkerTemplateUtils.processTemplateIntoString(template, data );
        //openhtmltopdf生成pdf
        @Cleanup ByteArrayOutputStream os = new ByteArrayOutputStream();
        PdfRendererBuilder builder = new PdfRendererBuilder();
        builder.withHtmlContent(htmlString, "");
        builder.useFont(new FSSupplier() {
            @SneakyThrows
            @Override
            public InputStream supply() {
                return resourceLoader.getResource("classpath:fonts/simsun.ttf").getInputStream();
            }
        }, "simsun");
        builder.toStream(os);
        builder.run();
        byte[] bytes = os.toByteArray();
        return new ResponseEntity(bytes, HttpStatus.OK);
    }

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