我不太喜欢问这类问题，但是，我已经花了整整 3 天时间试图解决我的代码中的这个错误。
我知道这是一个逻辑问题，我知道如何在脑海中解决它，但是当涉及到将我的想法转化为代码时，我就是无法让它按照我想要的方式工作。
我正在处理一份合同背书（合同的修改），它比较两个表中的数据，如果其中任何一个表发生了变化，那么它只绘制该信息。
有时，随着条件的变化，信息的长度会增加或减少，这就是问题所在。
我做了一个算法，一旦完成绘制信息，它就会得到最小的 Y 坐标，但是当我更改页面时，Y 坐标必须重置为700f并从那里重新开始绘画。
我使用的代码首先是由另一位程序员编写的，他已经不在这里了，我不知道如何做MCVE与 PDF 的。
但我认为以下方法可以帮助您帮助我。
我如何在 PDF 上比较和绘制信息的示例：
sOffA and sOffE是来自名为的类的对象SubscriptionOffer and A代表Agreement while E for Endorsement。背书是表格的副本Agreement在 MySQL 上，但信息已修改。这可能是不相关的信息，也可能不是。
if (!nullOrEmpty(sOffA.getGeneralConditions()) &&
!nullOrEmpty(sOffE.getGeneralConditions())) {
if (!getStringValue(sOffA.getGeneralConditions()).
equals(getStringValue(sOffE.getGeneralConditions()))) {
minYs[0] = pdf.rText(LEFT_MARGIN, y, 10,
constants.generalConditions(),
getStringValue(sOffA.
getGeneralConditions()));
minYs[1] = pdf.rText(HALF_PAGE, y, 10,
constants.generalConditions(),
getStringValue(sOffE.
getGeneralConditions()));
y = checkY(pdf, minYs);
}
} else if (nullOrEmpty(sOffA.getGeneralConditions()) &&
!nullOrEmpty(sOffE.getGeneralConditions())) {
minYs[0] = pdf.rText(LEFT_MARGIN, y, 10, "", "");
minYs[1] = pdf.rText(HALF_PAGE, y, 10,
constants.generalConditions(),
getStringValue(sOffE.
getGeneralConditions()));
y = checkY(pdf, minYs);
} else if (!nullOrEmpty(sOffA.getGeneralConditions()) &&
nullOrEmpty(sOffE.getGeneralConditions())) {
minYs[0] = pdf.rText(LEFT_MARGIN, y, 10,
constants.generalConditions(),
getStringValue(sOffA.
getGeneralConditions()));
minYs[1] = pdf.rText(HALF_PAGE, y, 10, "", "");
y = checkY(pdf, minYs);
}
我使用的数组是这个：
private float[] minYs = new float[] {700, 700, 700, 700, 700, 700, 700,
700, 700};
这是方法checkY，它检查数组中哪个 Y（如上所示）是最低的，然后将整个数组重新启动到所有元素的 700f。之后，它检查最低 Y 坐标下方的空间是否足以绘制下一个项目。
private float checkY(PdfRenderingEndorsement pdf, float... ys) throws Exception {
float y2 = getMinY(pdf, ys);
for (int i = 0; i < ys.length; i++) {
ys[i] = 700;
}
y2 = pdf.checkContentStream(y2, 5, 10);
return y2;
}
我猜这个方法是我的逻辑问题所在，正如你所看到的，我尝试了不同的方法，原始算法只是for-each然后我尝试了不同的事情但没有成功。
private float getMinY(PdfRenderingEndorsement pdf, float... ys) {
float result = 700f;
float lowest1 = 0, lowest2 = 0;
for (int i = 0; i < ys.length; i++) {
for (int j = 0; j < ys.length; j++) {
if (ys[j] > ys[i]) {
float aux = ys[i];
ys[i] = ys[j];
ys[j] = aux;
//lowest1 = ys[i];
//lowest2 = ys[j];
}
}
}
if (ys.length > 1) {
lowest1 = ys[0];
lowest2 = ys[1];
}
LOGGER.trace("lowest1: " + lowest1);
LOGGER.trace("lowest2: " + lowest2);
LOGGER.trace("newPage " + pdf.getNewPage());
/*if(pdf.getNewPage()) {
return lowest1 > lowest2 ? lowest2 : lowest1;
}
*/
/*for (float y : ys) {
if (y < result) {
result = y;
}
}*/
return lowest1 > lowest2 && pdf.getNewPage() ? lowest1 : lowest2;
//return lowest1;
}
我获取对象的 String 值并检查它们是否为 null 或空的方法：
private boolean nullOrEmpty(String s) {
return s == null || s.isEmpty();
}
private String getStringValue(Object o) {
if (o == null) {
return "";
}
return getStringValue(o, null);
}
private String getStringValue(Object o, Class< ? extends Unit> clazz) {
if (o instanceof Boolean) {
Boolean bd = (Boolean) o;
if (bd) {
return constants.getString("dbeditorYes");
} else {
return constants.getString("dbeditorNo");
}
} else if (o instanceof Date) {
Date date = (Date) o;
DateFormat df = new SimpleDateFormat(DateConstants.DATE_FORMAT);
return df.format(date);
} else if (o instanceof Enum) {
Enum en = (Enum) o;
return constants.enumMap().get(en.toString());
} else if (o instanceof Integer) {
Integer integer = (Integer) o;
if (clazz == null) {
return String.valueOf(integer);
} else {
Unit entry = unitSvc.get(clazz, integer);
String[] params = entry.toString().split("\\|");
String label = params.length == 1 ? params[0] : params[1];
return label;
}
} else if (o instanceof BigDecimal) {
BigDecimal bd = (BigDecimal) o;
DecimalFormat df = new DecimalFormat("#,##0");
df = new DecimalFormat("#,##0.00");
return df.format(bd);
} else if (o instanceof Float) {
Float bd = (Float) o;
DecimalFormat df = new DecimalFormat("#,##0");
df = new DecimalFormat("#,##0.00");
return df.format(bd);
} else if (o instanceof String) {
String td = (String) o;
return td;
}
return "";
}
以上所有方法都对应PdfEndorsement class.
这是PdfRenderingEndorsementclass 是实际绘制数据的类（这是完整的类，因为使用了所有方法）：
public class PdfRenderingEndorsement {
private static final Logger LOGGER = Logger.
getLogger(PdfRenderingEndorsement.class);
private static final float BOTTOM_MARGIN = 60;
private static final int DESC_WIDTH = 269; //For description fields
private static final int FIELD_WIDTH = 70;
private static final int FIELD_WIDTH2 = 60;
private static final int FIELD_WIDTH3 = 60;
private static final int FIELD1 = 112;
private static final int VALUE1 = 112;
private static final int FIELD2 = 80;
private static final int VALUE2 = 80;
private static final int VALUE_WIDTH = 80;
private static final int VALUE_WIDTH2 = 60;
private static final int VALUE_WIDTH3 = 80;
private static final int HALF_WIDTH = 325;
private static final int TEXT_WIDTH = 410; //For text fields
private final RwaConstants constants = ConstantsGetter.getInstance();
private final PDDocument doc;
private final String logoPath;
private final String[] header;
private int count = 0;
private boolean newPage;
private PDPageContentStream content;
/**
* Empty constructor. Used only to initialize the rendering class and call
* it's methods.
*/
public PdfRenderingEndorsement(PDDocument doc, String logoPath,
String[] header) {
this.doc = doc;
this.logoPath = logoPath;
this.header = header;
}
public float checkContentStream2(float y, int lines, int space)
throws Exception {
float newY = checkYCoord2(y, lines, space);
if (newY == 700) {
if (content != null) {
content.close();
}
File file = new File(logoPath);
PDJpeg logoImg = new PDJpeg(doc, new FileInputStream(file));
PDPage page = new PDPage(PDPage.PAGE_SIZE_LETTER);
doc.addPage(page);
content = new PDPageContentStream(doc, page);
content.drawImage(logoImg, 50, 720);
rHeader();
}
return newY;
}
private float checkYCoord2(float y, int lines, int space) {
float newY = y;
for (int i = 0; i < lines; i++) {
if ((newY - space) <= BOTTOM_MARGIN) {
newY = 700f;
return newY;
} else {
newY = newY - space;
}
}
return y;
}
public boolean getNewPage() {
return newPage;
}
public float checkContentStream(float y) throws Exception {
float newY = checkYCoord(y, 1, 10);
if (newY == 700) {
if (content != null) {
content.close();
}
File file = new File(logoPath);
PDJpeg logoImg = new PDJpeg(doc, new FileInputStream(file));
PDPage page = new PDPage(PDPage.PAGE_SIZE_LETTER);
doc.addPage(page);
content = new PDPageContentStream(doc, page);
content.drawImage(logoImg, 50, 720);
rHeader();
}
return newY;
}
public float checkYCoord(float y, int lines, int space) {
float newY = y;
for (int i = 0; i < lines; i++) {
if ((newY - space) <= BOTTOM_MARGIN) {
newY = 700f;
return newY;
} else {
newY = newY - space;
}
}
return y;
}
public float checkContentStream(float y, int lines, int space)
throws Exception {
float newY = checkYCoord(y, lines, space);
if (newY == 700) {
if (content != null) {
content.close();
}
File file = new File(logoPath);
PDJpeg logoImg = new PDJpeg(doc, new FileInputStream(file));
PDPage page = new PDPage(PDPage.PAGE_SIZE_LETTER);
doc.addPage(page);
content = new PDPageContentStream(doc, page);
content.drawImage(logoImg, 50, 720);
rHeader();
}
return newY;
}
public void closeContentStream() throws Exception {
if (content != null) {
content.close();
}
}
/**
* Renders the header for slip documents.
*/
public void rHeader() throws Exception {
float y = 760f;
content.setLineWidth(.5f);
content.setFont(PDType1Font.TIMES_ROMAN, 9);
content.setNonStrokingColor(Color.GRAY);
content.drawLine(50, 710, 562, 710);
y = rText(150, y + 19, 10, constants.endorsement(), null,
TEXT_WIDTH, 0);
y = rText(150, y + 9, 10, header[0], null, TEXT_WIDTH, 0);
y = rText(150, y + 9, 10, header[1], null, TEXT_WIDTH, 0);
y = rText(150, y + 9, 10, header[2], null, TEXT_WIDTH, 0);
y = rText(150, y + 9, 10, header[3], null, TEXT_WIDTH, 0);
content.setNonStrokingColor(Color.BLACK);
content.setFont(PDType1Font.TIMES_ROMAN, 9);
}
public float rText(float x, float y, int space, String labelField,
String value)
throws Exception {
return rText(x, y, space, labelField, value, FIELD_WIDTH,
HALF_WIDTH - 2 * FIELD_WIDTH - 10);
}
public float rTextLR(float x, float y, int space, String labelField,
String value)
throws Exception {
return rText(x, y, space, labelField, value, 0,
HALF_WIDTH - 2 * FIELD_WIDTH - 10);
}
public float rText(float x, float y, int space, String labelField,
String value, int fieldWidth)
throws Exception {
if (fieldWidth == 0) {
return rText(x, y, space, labelField, value, FIELD_WIDTH2,
VALUE_WIDTH2);
} else if (fieldWidth == 1) {
return rText(x, y, space, labelField, value, FIELD_WIDTH3,
VALUE_WIDTH3);
} else if (fieldWidth == 2) {
return rText(x, y, space, labelField, value, TEXT_WIDTH,
TEXT_WIDTH);
}
return y;
}
public float getFieldSize(int fs) {
switch(fs) {
case 1:
return (FIELD_WIDTH + VALUE_WIDTH);
case 2:
return (FIELD_WIDTH + DESC_WIDTH);
case 3:
return (FIELD_WIDTH + TEXT_WIDTH);
case 4:
return (HALF_WIDTH - FIELD_WIDTH);
case 5:
return (FIELD_WIDTH + TEXT_WIDTH);
case 6:
return (FIELD_WIDTH + TEXT_WIDTH);
case 7:
return (FIELD1 + 19) / 2;
case 8:
return (FIELD2 + 19) / 2;
default:
return 0;
}
}
public void paintLinesH(float y) throws Exception {
content.drawLine(49, y - 6, 327, y - 6);
content.drawLine(335, y - 6, 563, y - 6);
}
public void paintLinesV(float x, float yMax, float yMin)
throws Exception {
content.drawLine(x - 1, yMax - 6, x - 1, yMin - 6);
}
public float rText(float x, float y, int space, String labelField,
String value, int fieldWidth, int valueWidth)
throws Exception {
PDFont font = PDType1Font.TIMES_BOLD;
content.setFont(font, 9);
float y1 = 0f;
float y2 = 0f;
if (value == null) {
return rText(labelField, fieldWidth, x, y - 19, space, font, false);
} else {
if (labelField == null) {
font = PDType1Font.TIMES_ROMAN;
content.setFont(font, 9);
return rText(value, valueWidth, x, y - 19, space, font, true);
} else {
y1 = rText(labelField, fieldWidth, x, y - 30, space, font,
false);
font = PDType1Font.TIMES_ROMAN;
content.setFont(font, 9);
float y3 = y;
y2 = rText(value, valueWidth, x + fieldWidth + 10, y - 30,
space, font, true);
if (y3 < y2) {
return y2;
} else {
if (y1 >= y2) {
return y2;
} else {
return y1;
}
}
}
}
}
private ArrayList<String> getRows(String text, int width, PDFont font)
throws Exception {
float textWidth = font.getStringWidth(text) / 1000f * 9f;
ArrayList<String> result = Lists.newArrayList();
if (textWidth < width) {
result.add(text);
return result;
}
float spaceWidth = font.getStringWidth(" ") / 1000f * 9f;
String[] paragraphs = text.split("\n|\r\n|\r");
for (String paragraph : paragraphs) {
float pWidth = font.getStringWidth(paragraph) / 1000f * 9f;
if (pWidth < width) {
result.add(paragraph);
continue;
}
float widthCount = 0f;
String[] words = paragraph.trim().split(" ");
StringBuilder sb = new StringBuilder();
for (int j = 0; j < words.length; j++) {
if (words[j].trim().length() == 0) {
continue;
}
float wWidth = font.getStringWidth(words[j]) / 1000f * 9f;
float totalWidth = widthCount + wWidth + spaceWidth;
if (totalWidth < width + spaceWidth) {
sb.append(words[j]);
sb.append(" ");
widthCount = totalWidth;
} else {
result.add(sb.toString().trim());
sb = new StringBuilder();
sb.append(words[j]);
sb.append(" ");
widthCount = totalWidth - widthCount;
}
}
result.add(sb.toString().trim());
}
return result;
}
private float rText(String text, int width, float x, float y, int space,
PDFont font, boolean isValue) throws Exception {
float newY = y;
int rowHeight = 0;
newPage = false;
ArrayList<String> rowList = getRows(text, width, font);
if (isValue) {
for (String row : rowList) {
if (rowHeight >= 10) {
newY = checkContentStream(newY - 10);
newY = newY == 700 ? 680 : newY;
if (newY <= 700 && !newPage) {
newPage = true;
}
rowHeight = newY == 680 ? 0 : rowHeight;
}
content.beginText();
content.moveTextPositionByAmount(x, newY);
content.drawString(row);
content.endText();
rowHeight = rowHeight + 10;
}
} else {
for (String row : rowList) {
content.beginText();
content.moveTextPositionByAmount(x, newY - rowHeight);
content.drawString(row);
content.endText();
rowHeight = rowHeight + 10;
}
newY -= (rowHeight - 10);
}
return newY;
}
}
这是一个PDF 示例的输出与原始（for-each） 方法。
如果您看不到 PDF，请告诉我，但这里还有一些屏幕截图：
这是一个PDF 示例带有非注释代码的输出getMinY method.
修改后的输出如下：
正如您所看到的，第一个输出“跳”到下一页，因为假设“Texto de Poliza”右侧的文本以 Y 坐标 680、670 或类似的值结束，但在左侧我画了一个空字段("")最终结果是 90 或 100 接近这些数字。
然后比较 100 BOTTOM_MARGIN（即 60），因此它关闭实际页面（现在是文本结束的位置，但认为它位于之前的页面上）并创建一个新页面。
差不多一年前我就问过类似的问题here，这些类几乎是这些文件的副本，但我的逻辑上的这个错误仅与这些文件一起出现，因为数据的处理方式有点不同。
在那面文字墙之后，我希望有人能读到它并真正帮助我，也许我错过了一个重要的部分，但无法找到它。
提前致谢。
EDIT
在将 @mkl 的答案添加到我的方法中后，我发现当双方都没有更改信息时，它会产生间隙并且看起来不太好。
这就是我发送数据的方式PdfRenderingEndorsementAlternative:
for (String[] data: sOppData) {
//float y = renderer.getPreviousBandBase;
for (int i = 0; i < data.length - 2; i += 3) {
if (!nullOrEmpty(data[i + 1]) &&
!nullOrEmpty(data[i + 2])) {
if (!data[i + 1].equals(data[i + 2])) {
renderer.
render(new BandColumn(leftHalfPageField,
data[i], data[i + 1]),
new BandColumn(rightHalfPageField,
data[i], data[i + 2])
);
}
} else if (nullOrEmpty(data[i + 1]) &&
!nullOrEmpty(data[i + 2])) {
renderer.
render(new BandColumn(leftHalfPageField,
"", ""),
new BandColumn(rightHalfPageField,
data[i], data[i + 2])
);
} else if (!nullOrEmpty(data[i + 1]) &&
nullOrEmpty(data[i + 2])) {
renderer.
render(new BandColumn(leftHalfPageField,
data[i], data[i + 1]),
new BandColumn(rightHalfPageField,
"", "")
);
}
}
//float y2 = renderer.getPreviousBandBase();
/*if (y2 < y)
renderer.gap(20);
*/
renderer.gap(20);
}
上述评论的验证是否正确，或者我会回到过去产生错误的方法吗？我应该添加getPreviousBandBase()方法上Pdf渲染认可替代方案或者以另一种方式思考直接进行render() method?
这就是我获取当前双方具有相同信息的数据的方式。
一个例子是：
sOppA.getContractName() and sOppE.getContractName()都是"Hello World"由于两者相等，因此会留下间隙，如屏幕截图所示。
private ArrayList<String []> renderSubscriptionOpportunity(
SubscriptionOpp sOppA, SubscriptionOpp sOppE,
ArrayList<Location> lcA, ArrayList<Location> lcE)
throws Exception {
ArrayList <String[]> sOppData = new ArrayList<String[]>();
sOppData.add(new String[] {constants.currencyId(),
getStringValue(sOppA.getCurrencyId(),
Currency.class),
getStringValue(sOppE.getCurrencyId(),
Currency.class)});
sOppData.add(new String[] {constants.contractName(),
getStringValue(sOppA.getContractName()),
getStringValue(sOppE.getContractName())});
sOppData.add(new String[] {constants.mainActivityId(),
getStringValue(sOppA.getMainActivityId(),
MainActivity.class),
getStringValue(sOppE.getMainActivityId(),
MainActivity.class)});
//here add location table
if (lcA.size() > 1 && lcE.size() > 1) {
int lastIdA = 0;
int lastIdE = 0;
int size = lcA.size() >= lcE.size() ? lcA.size() : lcE.size();
LOGGER.trace("size: " + size + " lcA.size(): " + lcA.size() +
" lcE.size(): " + lcE.size());
for (int pos = 1; pos < lcA.size(); pos++) {
StringBuilder aSb = new StringBuilder();
StringBuilder eSb = new StringBuilder();
String valueA = "";
String valueE = "";
if (pos < lcA.size()) {
Country countryA = unitSvc.get(Country.class,
lcA.get(pos).getCountryId());
LOGGER.trace("Entro1");
if (countryA.getId() != lastIdA) {
aSb.append(countryA.getName());
lastIdA = countryA.getId();
} else {
aSb.append("");
}
} else {
aSb.append("");
}
if (pos < lcE.size()) {
Country countryE = unitSvc.get(Country.class,
lcE.get(pos).getCountryId());
LOGGER.trace("Entro2");
if (countryE.getId() != lastIdE) {
eSb.append(countryE.getName());
lastIdE = countryE.getId();
} else {
eSb.append("");
}
} else {
eSb.append("");
}
valueA = aSb.toString();
valueE = eSb.toString();
sOppData.add(new String[] {pos == 1 ? constants.countryId() :
"", valueA, valueE});
}
}
return sOppData;
}
正如评论中已经暗示的那样（实际上已经在对您的评论中前一个问题）我认为渲染类的整个架构需要彻底修改。根据您的PdfRenderingEndorsement我创建了以下课程PdfRenderingEndorsementAlternative这代表了该渲染的另一种方法：
public class PdfRenderingEndorsementAlternative implements AutoCloseable
{
//
// misc constants
//
static final int FIELD_WIDTH = 70;
static final int HALF_WIDTH = 325;
static final int TEXT_WIDTH = 410;
static final float BOTTOM_MARGIN = 70;
static final int LEFT_MARGIN = 50;
//
// rendering
//
public void gap(int size)
{
previousBandBase-=size;
}
public void render(BandColumn... columns) throws IOException
{
if (content == null)
newPage();
final List<Chunk> chunks = new ArrayList<Chunk>();
for (BandColumn column : columns)
{
chunks.addAll(column.toChunks());
}
float offset = 0;
while (!chunks.isEmpty())
{
float lowestAddedY = previousBandBase;
float highestBaseBeforeNonAdded = Float.NEGATIVE_INFINITY;
List<Chunk> added = new ArrayList<Chunk>();
for (Chunk chunk: chunks)
{
float y = previousBandBase + chunk.y + offset;
if (y >= BOTTOM_MARGIN)
{
content.beginText();
content.setFont(chunk.font, 9);
content.moveTextPositionByAmount(chunk.x, y);
content.drawString(chunk.text);
content.endText();
// draw
if (y < lowestAddedY)
lowestAddedY = y;
added.add(chunk);
}
else
{
float baseBefore = chunk.y + chunk.space;
if (baseBefore > highestBaseBeforeNonAdded)
highestBaseBeforeNonAdded = baseBefore;
}
}
chunks.removeAll(added);
if (!chunks.isEmpty())
{
newPage();
offset = -highestBaseBeforeNonAdded;
}
else
{
previousBandBase = lowestAddedY;
}
}
}
static public class BandColumn
{
public enum Layout
{
headerText(150, TEXT_WIDTH, 0, 10),
leftHalfPageField(LEFT_MARGIN, FIELD_WIDTH, HALF_WIDTH - 2 * FIELD_WIDTH - 10, 10),
rightHalfPageField(HALF_WIDTH, FIELD_WIDTH, HALF_WIDTH - 2 * FIELD_WIDTH - 10, 10);
Layout(float x, int fieldWidth, int valueWidth, int space)
{
this.x = x;
this.fieldWidth = fieldWidth;
this.valueWidth = valueWidth;
this.space = space;
}
final float x;
final int fieldWidth, valueWidth, space;
}
public BandColumn(Layout layout, String labelField, String value)
{
this(layout.x, layout.space, labelField, value, layout.fieldWidth, layout.valueWidth);
}
public BandColumn(float x, int space, String labelField, String value, int fieldWidth, int valueWidth)
{
this.x = x;
this.space = space;
this.labelField = labelField;
this.value = value;
this.fieldWidth = fieldWidth;
this.valueWidth = valueWidth;
}
List<Chunk> toChunks() throws IOException
{
final List<Chunk> result = new ArrayList<Chunk>();
result.addAll(toChunks(0, fieldWidth, PDType1Font.TIMES_BOLD, labelField));
result.addAll(toChunks(10 + fieldWidth, valueWidth, PDType1Font.TIMES_ROMAN, value));
return result;
}
List<Chunk> toChunks(int offset, int width, PDFont font, String text) throws IOException
{
if (text == null || text.length() == 0)
return Collections.emptyList();
final List<Chunk> result = new ArrayList<Chunk>();
float y = -space;
List<String> rows = getRows(text, width, font);
for (String row: rows)
{
result.add(new Chunk(x+offset, y, space, font, row));
y-= space;
}
return result;
}
final float x;
final int space, fieldWidth, valueWidth;
final String labelField, value;
}
//
// constructor
//
public PdfRenderingEndorsementAlternative(PDDocument doc, InputStream logo,
String[] header) throws IOException
{
this.doc = doc;
this.header = header;
logoImg = new PDJpeg(doc, logo);
}
//
// AutoCloseable implementation
//
@Override
public void close() throws IOException
{
if (content != null)
{
content.close();
content = null;
}
}
//
// helper methods
//
void newPage() throws IOException
{
close();
PDPage page = new PDPage(PDPage.PAGE_SIZE_LETTER);
doc.addPage(page);
content = new PDPageContentStream(doc, page);
content.drawImage(logoImg, 50, 720);
content.setLineWidth(.5f);
content.setNonStrokingColor(Color.GRAY);
content.drawLine(50, 710, 562, 710);
previousBandBase = 770;
render(new BandColumn(BandColumn.Layout.headerText, "ENDOSO", null));
for (String head: header)
render(new BandColumn(BandColumn.Layout.headerText, head, null));
content.setNonStrokingColor(Color.BLACK);
previousBandBase = 680;
}
// original method
static List<String> getRows(String text, int width, PDFont font) throws IOException
{
float textWidth = font.getStringWidth(text) / 1000f * 9f;
ArrayList<String> result = new ArrayList<String>();// Lists.newArrayList();
if (textWidth < width)
{
result.add(text);
return result;
}
float spaceWidth = font.getStringWidth(" ") / 1000f * 9f;
String[] paragraphs = text.split("\n|\r\n|\r");
for (String paragraph : paragraphs)
{
float pWidth = font.getStringWidth(paragraph) / 1000f * 9f;
if (pWidth < width)
{
result.add(paragraph);
continue;
}
float widthCount = 0f;
String[] words = paragraph.trim().split(" ");
StringBuilder sb = new StringBuilder();
for (int j = 0; j < words.length; j++)
{
if (words[j].trim().length() == 0)
{
continue;
}
float wWidth = font.getStringWidth(words[j]) / 1000f * 9f;
float totalWidth = widthCount + wWidth + spaceWidth;
if (totalWidth < width + spaceWidth)
{
sb.append(words[j]);
sb.append(" ");
widthCount = totalWidth;
}
else
{
result.add(sb.toString().trim());
sb = new StringBuilder();
sb.append(words[j]);
sb.append(" ");
widthCount = totalWidth - widthCount;
}
}
result.add(sb.toString().trim());
}
return result;
}
//
// helper classes
//
static class Chunk
{
Chunk(float x, float y, int space, PDFont font, String text)
{
this.x = x;
this.y = y;
this.space = space;
this.font = font;
this.text = text;
}
final float x, y;
final int space;
final PDFont font;
final String text;
}
//
// members
//
private final PDDocument doc;
private final PDJpeg logoImg;
private final String[] header;
private PDPageContentStream content = null;
private float previousBandBase = 0;
}
(PdfRenderingEndorsementAlternative.java)
此类基于带的概念，即内容的水平条纹，其中包含任意数量的包含字段名称和/或字段值的列。
它可以这样使用：
PDDocument document = new PDDocument();
PdfRenderingEndorsementAlternative renderer = new PdfRenderingEndorsementAlternative(document, logoStream, header);
renderer.render(
new BandColumn(leftHalfPageField, "Nombre del contrato/asegurado:", "Prueba Jesus Fac No Prop"),
new BandColumn(rightHalfPageField, "Nombre del contrato/asegurado:", "Prueba Jesus Fac No Prop con Endoso")
);
renderer.gap(20);
renderer.render(
new BandColumn(leftHalfPageField, "País:", "México"),
new BandColumn(rightHalfPageField, "País:", "México")
);
renderer.close();
document.save(new File(RESULT_FOLDER, "Endorsement.pdf"));
(RenderEndorsement.java)
如您所见，调用者不必再关心 y 位置，一切都在渲染器类中完成。结果：
我使用第一个示例 PDF 中的数据作为输入，结果如下：
正如您所看到的，没有页面跳转，也没有重叠的文本。