PDFUtil.java
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package com.template.utils;
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfPTable;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
@Slf4j
@Component
public class PDFUtil {
static BaseFont baseFont;
{
try {
baseFont = BaseFont.createFont("https://zhongzhi-cms.oss-cn-shanghai.aliyuncs.com/STSONG.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void tableStyle(PdfPTable table, int[] cellsWidth) throws DocumentException {
table.setWidths(cellsWidth);
table.setWidthPercentage(100);
table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
table.getDefaultCell().setVerticalAlignment(Element.ALIGN_MIDDLE);
table.getDefaultCell().setFixedHeight(30);
table.getDefaultCell().setBackgroundColor(BaseColor.BLUE);
table.getDefaultCell().setPadding(0);
table.getDefaultCell().setBorderWidth(0);
}
/**
* 流化下载
*
* @param bytes
* @param filename
*/
public static void renderPdf(final byte[] bytes, final String filename, String type) {
ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletResponse response = servletRequestAttributes.getResponse();
initResponseHeader(response, "application/" + type);
setFileDownloadHeader(response, filename, "." + type);
if (null != bytes) {
try {
response.getOutputStream().write(bytes);
response.getOutputStream().flush();
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
}
}
/**
* 分析并设置contentType与headers.
*/
private static HttpServletResponse initResponseHeader(HttpServletResponse response, final String contentType, final String... headers) {
// 分析headers参数
String encoding = "utf-8";
boolean noCache = true;
for (String header : headers) {
String headerName = StringUtils.substringBefore(header, ":");
String headerValue = StringUtils.substringAfter(header, ":");
if (StringUtils.equalsIgnoreCase(headerName, "utf-8")) {
encoding = headerValue;
} else if (StringUtils.equalsIgnoreCase(headerName, "no-cache")) {
noCache = Boolean.parseBoolean(headerValue);
} else {
throw new IllegalArgumentException(headerName + "不是一个合法的header类型");
}
}
// 设置headers参数
String fullContentType = contentType + ";charset=" + encoding;
response.setContentType(fullContentType);
if (noCache) {
// Http 1.0 header
response.setDateHeader("Expires", 0);
response.addHeader("Pragma", "no-cache");
// Http 1.1 header
response.setHeader("Cache-Control", "no-cache");
}
return response;
}
/**
* 设置让浏览器弹出下载对话框的Header.
*
* @param
*/
public static void setFileDownloadHeader(HttpServletResponse response, String fileName, String fileType) {
try {
// 中文文件名支持
String encodedfileName = new String(fileName.getBytes(StandardCharsets.UTF_8), "ISO8859-1");
response.setHeader("Content-Disposition", "attachment; filename=\"" + encodedfileName + fileType + "\"");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}