Java：使用Itext读取pdf文本

灰太狼 2023-09-26 09:34 106阅读 0赞

本文以Java示例展示使用Itext读取pdf文本的方法。

# 1、Maven仓库 #

在pom.xml中配置maven路径，指定依赖，如下：

>     <dependency>
>         <groupId>com.itextpdf</groupId>
>         <artifactId>itextpdf</artifactId>
>         <version>5.5.1</version>
>         <type>jar</type>
>     </dependency>

# **2** 、**读取PDF文本** #

## **2.1 读取整个PDF文本** ##

/**
         * 用来读取pdf文件
         * @param fileName
         * @return
         * @throws IOException
         */
        public static String readPdfByPage(String fileName) {
            String result = "";
            File file = new File(fileName);
            FileInputStream in = null;
            try {
                in = new FileInputStream(fileName);
                // 新建一个PDF解析器对象
                PdfReader reader = new PdfReader(fileName);
                reader.setAppendable(true);
                // 对PDF文件进行解析，获取PDF文档页码
                int size = reader.getNumberOfPages();
                for(int i = 1 ; i < size + 1; ){
                    //一页页读取PDF文本
                    String pageStr = PdfTextExtractor.getTextFromPage(reader,i);
                    result = result + pageStr + "\n" + "PDF解析第"+ (i)+ "页\n";
                    i= i+1;
                }
                reader.close();
            } catch (Exception e) {
                System.out.println("读取PDF文件" + file.getAbsolutePath() + "生失败！" + e);
                e.printStackTrace();
            } finally {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e1) {
                    }
                }
            }
            return result;
        }

## 2.2 读取某几页PDF文本 ##

public static String readPdfByPage(String fileName, int from, int end) {
            String result = "";
            File file = new File(fileName);
            FileInputStream in = null;
            try {
                in = new FileInputStream(fileName);
                // 新建一个PDF解析器对象
                PdfReader reader = new PdfReader(fileName);
                reader.setAppendable(false);
                // 对PDF文件进行解析，获取PDF文档页码
                int size = reader.getNumberOfPages();
                for(int i = from ; i <= end && i< size;i++ ){
                    //一页页读取PDF文本
                    String pageStr = PdfTextExtractor.getTextFromPage(reader,i);
                    result = result + pageStr + "\n" + "PDF解析第"+ i+ "页\n";
                }
                reader.close();
            } catch (Exception e) {
                System.out.println("读取PDF文件" + file.getAbsolutePath() + "生失败！" + e);
                e.printStackTrace();
            } finally {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e1) {
                    }
                }
            }
            return result;
        }

# 3、 itextpdf官网 #

[https://itextpdf.com][https_itextpdf.com]

[https_itextpdf.com]: https://itextpdf.com/