Question

我使用PDFBox在Java中生成报告。我的一个要求是创建一个PDF文档，其中包含页面顶部的公司徽标。我无法找到实现这一目标的方法。我在Java类中有以下方法：

import sys,os,time,logging

RUN_RELOADER = True

logger = logging.getLogger(__name__)

whitelist = ['webapp2', 'paste', 'logging']

# this code is from autoreloader
_mtimes = {}
_win = (sys.platform == "win32")
_error_files = []
_cached_modules = set()
_cached_filenames = []


def gen_filenames(only_new=False):
    global _cached_modules, _cached_filenames
    module_values = set(sys.modules.values())
    _cached_filenames = clean_files(_cached_filenames)
    if _cached_modules == module_values:
        # No changes in module list, short-circuit the function
        if only_new:
            return []
        else:
            return _cached_filenames + clean_files(_error_files)

    new_modules = module_values - _cached_modules
    new_filenames = clean_files(
        [filename.__file__ for filename in new_modules
         if hasattr(filename, '__file__')])

    _cached_modules = _cached_modules.union(new_modules)
    _cached_filenames += new_filenames
    if only_new:
        return new_filenames + clean_files(_error_files)
    else:
        return _cached_filenames + clean_files(_error_files)

def clean_files(filelist):
    filenames = []
    for filename in filelist:
        if not filename:
            continue
        if filename.endswith(".pyc") or filename.endswith(".pyo"):
            filename = filename[:-1]
        if filename.endswith("$py.class"):
            filename = filename[:-9] + ".py"
        if os.path.exists(filename):
            filenames.append(filename)
    return filenames

# this code is modified from autoreloader
def check_code_changed():
    global _mtimes, _win
    for filename in gen_filenames():
        stat = os.stat(filename)
        mtime = stat.st_mtime
        if _win:
            mtime -= stat.st_ctime
        if filename not in _mtimes:
            _mtimes[filename] = mtime
            continue
        if mtime != _mtimes[filename]:
            _mtimes = {}
            try:
                del _error_files[_error_files.index(filename)]
            except ValueError:
                pass
            mname = filename.split('/')[-1].split('.')[0]
            logger.info('CHANGED %s, RELOADING %s' % (filename,mname))
            try:
                reload(sys.modules[mname])
            except:
                pass

    return False

def reloader_thread():
    while RUN_RELOADER:
        check_code_changed()
        time.sleep(1)

图像当前显示在PDF的底部。我知道我需要修改的行是public void createPdf() { PDDocument document = null; PDPage page = null; ServletContext servletContext = (ServletContext) FacesContext .getCurrentInstance().getExternalContext().getContext(); try { File f = new File("Afiliado_2.pdf"); if (f.exists() && !f.isDirectory()) { document = PDDocument.load(new File("Afiliado_2.pdf")); page = document.getPage(0); } else { document = new PDDocument(); page = new PDPage(); document.addPage(page); } PDImageXObject pdImage = PDImageXObject.createFromFile( servletContext.getRealPath("/resources/images/logo.jpg"), document); PDPageContentStream contentStream = new PDPageContentStream( document, page, AppendMode.APPEND, true); contentStream.drawImage(pdImage, 0, 0); // Make sure that the content stream is closed: contentStream.close(); // Save the results and ensure that the document is properly closed: document.save("Afiliado_2.pdf"); document.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }，但我需要指定哪些坐标才能显示在页面顶部？

Answer 1

通常，PDF页面的坐标系从左下角开始。所以用

contentStream.drawImage(pdImage, 0, 0);

您正在绘制图像。您可以使用

获取页面的边界

page.getMediaBox();

并用它来定位你的图像，例如。

PDRectangle mediaBox = page.getMediaBox();

// draw with the starting point 1 inch to the left
// and 2 inch from the top of the page
contentStream.drawImage(pdImage, 72, mediaBox.getHeight() - 2 * 72);

其中PDF文件通常指定72个点到1个物理英寸。

如何使用Apache PDFBox将图像移动到PDF页面的顶部

1 个答案: