java中生成PDF如何让字符串输出自带下划线
时间: 2024-01-28 16:05:42 浏览: 27
在Java中生成PDF并让字符串输出自带下划线,可以使用PDFBox这个开源的Java库。具体实现方法如下:
1. 导入PDFBox库,添加依赖:
```xml
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.23</version>
</dependency>
```
2. 创建一个PDF文档对象:
```java
PDDocument doc = new PDDocument();
```
3. 创建一个页面对象:
```java
PDPage page = new PDPage();
doc.addPage(page);
```
4. 创建一个内容对象:
```java
PDPageContentStream content = new PDPageContentStream(doc, page);
```
5. 设置字体和字号:
```java
PDFont font = PDType1Font.HELVETICA;
int fontSize = 12;
```
6. 设置下划线样式:
```java
content.setStrokingColor(Color.BLACK);
content.setLineWidth(0.5f);
```
7. 输出带下划线的字符串:
```java
String text = "带下划线的字符串";
float startX = 100;
float startY = 700;
float stringWidth = font.getStringWidth(text) / 1000 * fontSize;
content.beginText();
content.setFont(font, fontSize);
content.newLineAtOffset(startX, startY);
content.showText(text);
content.drawLine(startX, startY - fontSize / 4, startX + stringWidth, startY - fontSize / 4);
content.endText();
```
8. 关闭内容对象和文档对象:
```java
content.close();
doc.close();
```
完整的代码示例:
```java
import java.awt.Color;
import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
public class PDFWithUnderline {
public static void main(String[] args) throws IOException {
PDDocument doc = new PDDocument();
PDPage page = new PDPage();
doc.addPage(page);
PDPageContentStream content = new PDPageContentStream(doc, page);
PDFont font = PDType1Font.HELVETICA;
int fontSize = 12;
content.setStrokingColor(Color.BLACK);
content.setLineWidth(0.5f);
String text = "带下划线的字符串";
float startX = 100;
float startY = 700;
float stringWidth = font.getStringWidth(text) / 1000 * fontSize;
content.beginText();
content.setFont(font, fontSize);
content.newLineAtOffset(startX, startY);
content.showText(text);
content.drawLine(startX, startY - fontSize / 4, startX + stringWidth, startY - fontSize / 4);
content.endText();
content.close();
doc.save("pdf_with_underline.pdf");
doc.close();
}
}
```
运行代码后,会生成一个名为pdf_with_underline.pdf的PDF文件,其中包含了一个带下划线的字符串。